5 BACKGROUND OF INVENTION

_A In one aspect this invention relates to a particular group of N-hydrocarbon substituted lactams having novel properties. In another aspect the invention relates to utilization of such lactams in specific fields 10 of application where said properties are required to provide significant advantages.

N-lower alkyl pyrrolidones have found wide commercial acceptance as non-toxic aprotic chemical solvents. However, absence of hydrophobic-lipophobic 15 balance in these molecules, as in the case of N-methyl pyrrolidone, prevents mAcellular formation;, consequently they possess no significant aqueous surfactant properties. Amine oxides are known to possess high surfactant activity; however these compounds are not 20 stable at high temperatures and cannot be employed in metal working or high temperature fiber processing.

Accordingly, it is an object of the present invention to overcome the above defficiencies by proving improved surfactant-complexant agents which are readily 25 obtained in an inexpensive and commercially feasible manner.

Another object of this invention is to provide a group of compounds having excellent surfactant and complexing properties. "** 30 Another object is to provide a group of compounds having viscosity building, wetting, and/or anti-corrosive * properties.

Still another object is to provide specialized uses for a group of compounds having the above properties. 35 These and other objects of the invention will become apparent from the following description and disclosure.

THE INVENTION

According to this invention there is provided a distinctive group of N-hydrocarbon substituted Lactams having unusual properties and defined by the formula

wherein n is an integer having a value of from 1 to 3 and

R' is a hydrophobic radical selected from the group consisting of a linear, branched chain ¹ or cyclic alkyl radical containing from 7 to 22 carbon atoms; a naphthyl or alkyl substituted naphthyl radical containing from 10 to 26 carbon atoms and an alkylphenyl or phenylalkyl radical containing from 9 to 26 carbon atoms; which lactams are capable of forming micelles in neutral, basic or acidic aqueous media or have a critical micelle

_3 concentration of between about 1 x 10 and about 5 x

10~ moles per liter. Of the above lactam surfactants, the N-alkyl lactams are preferred and, of these, N-alkyl pyrrolidones containing 8 to 18 carbon atoms and having a critical micelle concentration less than 2 x 10 moles per liter are most preferred.

While it is intended to include lactams substituted with cycloalkyl R* groups, it is found that the hydrophobic affect of these cyclic groups is less than that of their linear analogs. Accordingly, where a N-cycloalkyl R ¹ group is intended, the R" moiety contains at least 8 carbon atoms to provide hydrophobic-lipophobic balance.

It is also intended to include lactams wherein one of the hydrogen atoms bonded to a carbon atom member of the heterocyclic ring can be substituted with methyl or ethyl. The cyclic hydrophilic moiety of the compounds herein defined is an important factor in maximizing their efficiency by concentrating the molecule, and thus the surfactant activity, at the interface and minimizing solubility of the molecule in liquid phases. The above properties demonstrate the high efficiency and activity of the present nonionic surfactants. Such surfactant properties are unexpected since the compounds lack the polyalkoxy groups commonly associated with conventional nonionic surfactants. By way of comparison, N-dodecyl-2-pyrrolidone, exhibits a surfactant properties equivalent to a lauryl alcohol containing five moles of ethoxylate, i.e.

C, _H _?e -(CH ₃ CH ₂ 0) -H, a known commercial nonionic surfactant. Not all of the present lactams possess good aqueous surfactant properties. For example, the pyrrolidones having R' substituents containing less than 8 carbon atoms do not have hydrophobic groups of a length sufficient to form stable micelles in water. On the other hand, R' alkyl substituents of hexadecyl and above exhibit an imbalance such that the hydrophilic pyrrolidone or caprolactam moiety cannot counteract the dominating hydrophobic character of the alkyl group. However, these higher molecular weight compounds can provide surfactant properties in non-aqueous systems and, are valuable wetting agents in applications involving solid substrates.

The structure of the present lactams provides a key to their unique properties. Specifically, the highly polar and hydrophilic pyrrolidone moiety exhibits several resonance forms, i.e.

The existence of such multiple resonance states contributes to the high dipole moment of about 4 debye, possessed by these lactams. A high dipole moment is an important property, conferring the ability of these -molecules to assume multiple resonance forms which promotes their tendency to complex or interact with many chemical groups. For example, the ability of these compounds to interact with anionic moieties, e.g. sulfate groups, is beneficial in enhancing foam and reducing skin irritability of various medicinal creams and lotions containing such or similar anionic groups.

The above lacta products having a molecular weight of from about 180 to about 450 are conveniently prepared by several known processes including the reaction between a lactone having the formula

wherein n is as defined above, and an amine having the formula R'-NH ₂ wherein R' is as defined above. The a ine reactant having the formula R'-NH- includes alkyl- amines having from 7 to 20 carbon atoms; naphthyl or alkylnapfhyl amines having from 10 to 26 carbon atoms; alkylphenyl or phenylalkyl amines having from 9 to 26 carbon atoms; amines derived from natural products, such

as coconut amines or tallow amines and distilled cuts or hydrogenated derivatives of such fatty amines. Also, mixtures of amine reactants can be used in the process for preparing the present compounds. Such mixtures can include cyclic, linear and branched chain amino species having an alkyl or other organic substituent of the same or different molecular weight. In the present process the amine and ^' lactone reactants, combined in a mole ratio of from about 1:1 to about 1:5, are reacted under conditions of constant agitation, at a temperature between about 200°C. and about 350°C. under a pressure of from atmospheric to about 650 psig for a period of from about 1 to about 15 hours; preferably at 250°C. to 300°C. under an initial ambient pressure for a period of from 5. to 10 hours. The resulting lactam product is recovered and purified by distillation or by any other convenient recovery process. I

The N-alkyl lactam products having 11 to 14 carbon atoms are clear, water white liquids, at room temperature; whereas those having 16 or more carbon atoms are solids. These lactams have a neutral or slightly basic pH, a surface tension between about 25 and about 35 dynes/cm as a 0.1% water solution and a viscosity of from about 6 to about 30 cps at 25 ^β C. More particularly, these lactams of 97% or higher purity are capable of producing micelles at a critical molar micelle concentration less

_3 than 1 x 10 . For the N-alkyl-2- pyrrolidones species the capability of producing micelles at a critical micelle concentration of between about 4.4 x 10 -4 and about 5 x 10~ is obtainable. Generally, the C _fl to C.. alkyl lactams display primarily surfactant properties; whereas the C, _β to C-p alkyl species are primarily σomplexing agents; although some degree of surfactants and complexing capability exists in all of the present species.

The maximum surface concentration of the present surfactants at equilibrum above the critical micelle concentration is exceptionally high, i.e. between about 2 moles/cm x 10~ and about 5 moles/cm x 10 . It is believed that the onodisperse nature of the hydrophobe and hydrophile moieties of the these surfactants contribute to the high surface concentrations by maximizing entropy of packing, particularly in the case of the N-decyl-2- pyrrolidone species which exhibits essentially equal hydrophobe/hydrophobe and hydrophile/hydrophile interactions at the liquid interface, while longer R groups reduce packing due to steric effects.

The present group of lactams also exhibit a unique and heretofore unrealized combination of properties, suitable for increasing rates of solubilization for solids in a liquid medium in which they are normally insoluble.

Many-drugs having little or no solubility in water are orally administered in the form of pills, tablets or capsules. Examples of such drugs include hydrochlorotriazide, chlorothiazide, griseofulvin, progesterone, phenyl butazone, and sulfathiazole. These drugs may be formulated with non-pyrrolidonic anionic surfactants such as sodium lauryl sulfate, dioctyl sodium sulfosuccinate or non-ionic surfactants such as polyoxye hylene (20) sorbitan monoleate (Tween 80) or polyoxyethylene (23) lauryl ether. Polyoxyethylene based non-ionic surfactants may contain dioxane and, in the case of those derived from fatty amines such as polyoxyethylated (5) tallow amine, nitrosoamines which are well known carcinogens. The present lactams, besides their ability to diminish aggregation of drug particles and increasing the area available for dissolution, are free of dioxane and nitrosoa ine contaminants and the

purity of these non-alkoxylated compounds is more readily assured since they are not subject to variations of extraneous by-product contamination or degree of alkylene oxide polymerization. Unlike sodium lauryl sulfate, the present pyrrolidones are non-irritating and do not react with acidic drugs or pharmaceutical excipients. Additionally, the present lactams possess the ability to solubilize a drug in its micelles, as well as the capability of lowering surface tension to permit water and digestive fluid penetration into the drug mass, thus increasing the rate of drug entry into the blood stream. In certain cases, where dissolution is the rate-limiting step in the absorption process, these lactams in many instances actually increase the normal peak saturation levels in the blood for a particular drug.

A particularly beneficial property of instant lactams is their comple ing ability in which the complexed active compound is positioned on the micelle surface. The lactam containing molecules in turn migrate to the surface of a bulk solution forming a monomolecular f lm thereon; thus concentrating the chemical which has been complexed at the solution-substrate interface. This spacial concentration of the active ingredient at the liquid surface provides more efficient contact between the complexed chemical and the substrate, thus permitting the efficient use of an active ingredient to preform its intended function. The lower concentration of an active ingredient such as a drug having toxic properties, can result in lowering toxicity and alleviating undesirable side effects.

The complexing capability of the present products involves a wide range of organic and inorganic compounds and includes compounds containing a phenolic group, a mercapto group, an acidic hydrogen, metal oxides compounds, metal salts, halogens and polarizable compounds. More specifically, these compounds include mineral acids such, as the hydrogen halides, particularly hydrochloric acid, sulfuric, nitric, phosphoric acids, etc., organic acids such as chloroacetic, acetic, formic, etc., phenolics such as vanillin, phenol, resorcinol, etc. metal salts such as Snl_, BiC _g H_0_, SbF_, etc. and polarizable compounds such as I«, HI_, and resonant structures i.e. dyestuffs and fluorescent dyes and perfu ary materials, etc. They also complex with urea and urea derivatives and odor forming components of human perspiration to mask or remove odor and stains caused by these components.

Additionally, they control objectionable odors emanating from metal treating and slaughter house operations as well as household ordors on rugs, furniture, clothing, or encountered in pet environments, veternary sites. The present surfactants also complex with odor forming bodies in animal and human wastes containing eg. mercaptans, urea, tars, nicotine, molds, and other odor causing chemicals.

The present N-alkylpyrrolidones are excellent clarifying agents for beverages, particularly beer and wines, which contain phenolic and. other impurities. Removal of contaminants results in a product having improved clarity, taste and color. Beverage impurities can be removed by several methods. For example, water soluble pyrrolidones of this invention, also soluble in the beverage, are complexed with the phenolic impurities at a temperature below their respective cloud points.

When the beverage is heated above the cloud point of the lactam employed, the resulting complexed impurities, eg. polyphenols/lactam, are separated and thus removed. This method of clarification is beneficially employed using N-alkyl C, ₀ to C. . pyrrolidones. Water insoluble

N-alkyl lactams of this invention e.g. N-hexadecyl, N-oσtadecyl and N-tallow pyrrolidones are also useful and are employed to extract, impurities by intimately mixing the lactam and beverage. The phenolic impurities, mainly polyphenols, preferentially complex with the heterocyclic ring of the water insoluble lactam and are then removed by filtration.

Still further the complexability and high heat stability of the present lactams makes them valuable decontaminating agents for industrial wastes including radio active waste material. For example radioactive halogens complex with certain of the present lactams to provide a less toxic water solubule product which can be washed off vegetation on which animals feed; also water insoluble lactams can be used to complex with and extract radioactive material from aqueous solutions, thereby concentrating them in a less toxic form which can be more economically dealt with. Further, complexed radioactive products can be used as liquid feed to a fixation process which converts the product into a solid non-leachable material for permanent storage, as in the processes described in U.S. patents 3,206,409; 3,153,566; 3,213,031 and 3,110,557. With increasing use of nuclear reactors for power and production, it is becoming increasingly urgent to devise safer methods for disposal of fission by-products or waste materials in a less toxic form. The present lactams can also be used in the purification of water, e.g. a sewage treatment, to remove organic pollutants from aqueous streams by an economical low energy process.

Still another benefit obtained by the complexing capability of the present compounds is realized by their ability to reduce toxicity of those systemic and non-systemic chemicals whose toxicity levels exceed the use intended. Pesticides, insecticides, fungicides and herbicides all contain members in this category. For example, 2-methyl-2-(methythio) propional ehyde 0-(methyl carbamoyl) oxime, known as Aldicarb, when mixed with water produces a ecologically hazardous mixture. However, complexing this compound with one of the present compounds reduces its toxicity to a level sufficient to effectively kill household insects without danger to humans. The toxicity of phenyl mercuric compounds such as the acetate, borate, chloride, hydroxide, nitrate, naphthenate, oleate, propionate and salicylate as well as that of aldrin and dieldrin are signi icantly reduced through complexing. Other herbicides and pesticides having normal required toxicity can be incorporated with the lactams of this invention to provide better adhesion on the surface of plant tissue, increased persistence of chemical action, reduced interfacial tension between the active component and plant surface and other benefits commensurate with the particular properties of the lactam selected. Also, because the present compounds tend to concentrate the active ingredient at the surface of its micellular structure, smaller dosages of the active ingredient can be employed and more efficiently utilized. Accordingly, the present lactams serve as valuable adjuvants for active ingredients in liquid solution whic are applied to a substrate.

The performance of non-systemic active ingredients depends on the quality of the spray deposit. Particularly fungicides require a complete and uniform coverage which is resistant to heavy dews, rainfall and sprinkler irrigation. N-n-dodecyl-2-proplylene promoted polyvinylpyrrolidone, most preferably in about an 80/20 wt % mixture with an alkyd-resin based compound is particularly beneficial in providing good sticking performance on crops with a wide variety of active ingredients. Application levels of from about 30 to about 130 ml/100 liters of spray, depending on total spray volume, type of crop and active ingredient, are suitable. Also, superior oil/surfactant blends are formed, e.g. by 85/15 wt % mixtures of N-octyl-2-pyrrolidone and N-dodecyl-2-pyrrolidone, with a non-phytotoxic paraffin oil. Such blends are more effective than conventional types of spray oils because of the synergestic effect between the spray oil and the surfactant blend.

Another remarkable and unexpected property of the N-alkyl pyrrolidones of this invention is the reverse solubility exhibited by the C _g and C ₁₄ alkyl species, hereinafter discussed in more detail.

The cloud points of 10% aqueous solutions of the following compounds are reported for various N-alkyl-2- pyrrolidones alkyl group Cloud Point cyclohexyl 55°C. octyl < 0 ^β C. decyl 19°C. dodecyl 15-19 ^β C. tetradeσyl 33 ^β C. coco 22-23°C. hexadecyl insoluble

The cloud points indicate the ability of the lactam molecule to retain water of hydration. The higher the cloud point, the more soluble, i.e. hydrated, the surfactant. As shown above, the cyclohexyl pyrrolidone species is highly soluble, requiring 55°C. to effect dehydration. However, this species fails to form stable micelles. Conversely, the octyl pyrrolidone species has a cloud point below room temperature and is almost insoluble. It appears that the octyl group has insufficient length to counteract the action of the pyrrolidone groups in the interactions (a) and (b)

VS D.

(b)

For the octyl species, it is believed that interaction (a) predominates and the resulting dimer is insoluble for the reason that the R' groups are exposed in terminal positions of the interacted molecules thus reducing the hydration of the pyrrolidone moieties. Conversely, for longer chain R* groups, interaction (b) predominates and stable micelles i.e.

where interaction occurs among the R' groups, are then formed.

The above properties combine to provide products of the present invention which are useful (1) in the solubilization of insoluble compounds such as for example insoluble drugs, cosmetics and agricultural chemicals to form surface active compositions, (2) as slip and antiblock agents for incorporation of components into plastic films to decrease the coefficient of friction, (3) as hydrolysis resistant solvents and auxiliaries for use in either acid or caustic environments, (4) as paint or resin strippers in electronic applications, e.g. printed circuit boards, (5) in the separation of molecules, e.g. the separation of biologically active or other active molecules from fermentation broths or other

solutions, (6) as viscosity builders to form gels and pastes, (7) as a water-in-oil or oil-in-water emulsifiers for cosmetics, particularly in hair and skin care formulations (8) as antistatic agents (9) as beverage clarifiers, particularly beer and wine clarifiers, (10) as stain and spot removers for textiles, (11) as surfactants for wettable powders and detergents, (12) as foam stabilizers, (13) as agents for increasing the rate of dissolution of normally insoluble tablets or pills, (14) as detoxifying agents and many other uses which will become apparent from the present description and disclosure.

The lactams of this invention are soluble in most organic solvents including glycerin, acetone, lower molecular weight alcohols, toluene, polyethylene glycols, polypropylene glycols, xylene, heptane, methylene chloride, perhalogenated lower molecular weight hydrocarbons, paraffin oil, Stoddard solvent, etc., and are compatible with all classes of surfactants under varying pH conditons. The water dispersibility properties of the C. _Ω to C . alkyl species seems to contravert the generally accepted chemical behavior of hydrocarbon compounds. One would" expect that as the alkyl chain length increases, the compound would become more hydrophobic. Instead, it is now discovered that while

N-octyl pyrrolidone is substantially insoluble in water, the N-decyl species shows partial solubility and the N-dodecyl and N-tetradecyl pyrrolidones are completely water dispersable. Water insolubility is again evidenced in the pyrrolidones having alkyl group of 16 or more carbon atoms, for the reasons explained above. However, blends of higher alkyl species with the C_ to C.. alkyl species are water dispersible by algebraic summation of the individual contributions of the respective alkyl

and pyrrolidone moieties to the hydrophobic/hydrophilie balance. Also a hydrotrope or a mineral acid electrolyte e.g., a hydrogen halide such as HC1, sulfuric acid, phosphoric acid, xylene sulfonate, toluene sulfonate, cumene sulfonate, an alcohol, a short chain fatty acid, in low level concentration, aids in improving water dispersibi lity of the N-C_ to C. _ alkyl pyrrolidones since they are readily solubilized in aqueous solutions of pH 6 or less. The hydrophilic and oleophilic properties of certain members in the present group of pyrrolidones makes them selectively suitable for certain applications. Specifically, the oleophilic members are suitable for extraction processes, e.g. in the recovery of residual material or in the fractional separation of a compound from aqueous solution such as the separation of a drug under conditions where a low temperature must be employed to prevent its decomposition. In such cases, the present lactams complex with the drug and the resulting drug-complex is easily separated by heating the complex above its cloud point to precipitate the drug which is then skimmed off the surface as the lactam layer. The members which exhibit only partial water solubility, such as the C, ₀ and C- ₄ alkyl species, are nevertheless important as non-toxic time release surfactant-co plexants for drugs, insecticides and the like which obviate the need for extraneous adducts or other surfactants in the formulation.

While generally the present N-alkyl pyrrolidones are relatively low foamers and while the N-tetradecyl species is particularly useful in stabilizing foaming of a commercial detergent compositions at temperatures in the range of 40-50°C, as in household and industrial cleaning solutions, it is surprising to find that the N-octyl and

the N-decyl pyrrolidones augments and significantly increases foaming and foam stabilization of detergent solutions, such as those employed in a laundry or dishwashing solution, bar soap, cleansing cream, hair mousse etc. Generally for domestic use, high foaming dishwashing fluids are preferred; whereas for industrial use low foamers are in demand. In laundry detergents lower sudsing formulations are desired for better rinsing. By judicious selection of the proper member of surfactants herein disclosed, both demands can be satisfied. These lower alkyl species are also useful in flotation deinking or other flotation processes where high foam levels are desired, in forming as foam markers and in plastic coating and foaming applications., e.g. for enhancement of polyurethane foam. The excellent wetting properties of the present lactams also recommends their use in cosmetic creams, emollients, soaps and shampoos. •

In addition, the present compounds impart anti-static and softening properties to fabrics during a laundry drying or washing cycle. It is discovered that residual anti-static protection is provided even when the present surfactants are added only in the washing cycle. Accordingly these pyrrolidones can be added to a detergent formulation or can be applied directly to a fabric to coat fibers or to a cellulosic material e.g. as a anti-static spray, for rugs or clothing or can be used as paper coated strips which are added to a dryer. Soil release and anti-soil deposition on fabrics is also imparted when the fabrics are coated, washed or otherwise contacted with the pyrrolidones of this invention. Instant products also can be applied to printing rollers or any equipment where slippage, friction or other factors build-up a considerable electrostatic charge as for example in electronic equipment or equipment used for the manufacture of certain plastics. Additionally, the excellent thermal stability of the present lactams makes them useful as high

temperature anti-static agents and permits their formulation into molten plastics such as polyethylene, polypropylene, nylon, mylar, etc. before extrusion without any degradation of the plastic. In such oleophilic „ 5 matrices, the hydrophilic pyrrolidone migrates to the plastic surface and acts as an antistat and anti-blocking agent.

The complexing properties of the present pyrrolidones makes them particulrly effective as biocidal 10 .washing agents employed for hospital, ^" household or industrial use. A particular application would involve the complex formed between iodine and instant pyrrolidones as an effective antiseptic solution which can be used as such, e.g. as a spray, or can be added to a detergent 15 solution to provide or enhance germicidal properties.

Also, such complexes of the higher, molecular pyrrolidones of ^C ₁ 4~ ^C ₂ 0 ^al ^y! species, having higher viscosity can be applied to wounds as a cream or as a flexible antiseptic bandage or can be formulated into other 20 compositions to enhance viscosity.

Because of their excellent wetting, fixative and complexing properties the C_ to C« ₀ alkyl-2-pyrrolidones are beneficially incorporated in formulations for perfume, or for insecticides, herbicides, 25 plant growth regulants, pesticides, annelidicides, etc. as a fixing agent to retain the active agent on the surface of the plant membrane or close to the skin surface where applied. Also biocidal solutions using complexes of the present pyrrolidones with various drugs can be used in 30 veterinary medications or as disinfectant washing solutions, such as a wash for range cattle to kill incipient bacteria while providing residual inhibition of future infections from ticks and other pests. The high skin and hair substantivity and moisturizing capability of

the present surfactants particularly the C - alkyl species makes them beneficial adducts in the cosmetic art for use in lotions, creams, shampoos and hair sprays. They also provide excellent hair hold and curl retention when employed in hair setting lotions.

The excellent wetting properties of instant lactams recommends them as outstanding surfactants for use in concentrate formulations of wettable powders, particularly fungicidal ^" and herbicidal powders, which are subsequently diluted with water to form aqueous suspensions suitably employed as sprays for application on crops. These suspensions which include the lactam in the active concentrate formulation are distinguished by signi icantly improved stability over extended periods. The method for preparing the concentrate involves blending the active component, preferably having a particle size less than 25 micrometers, with an inert carrier, a dispersing agent to prevent flocculation and the lactam wetting agent to facilitate the suspension of particles. The blend is generally milled, eg. on a fly cutter mill operated at about 20,000 rpm, at ambient temperature for a period of from about 0.5 to about 5 minutes. This operation provides a wettable powder concentrate having a suspensibility greater than 75% and a wetting time of less than 3 seconds. Suitable fillers for the concentrate include clays, talc, silica powder, bentonite, and diatomaceous earth. The blends of anionic dispersing agent and the nonionic lactam with the wettable powder and filler ensures good storage stability and improves suspension properties upon dilution in the field. The present lactams are highly compatible with anionic dispersants commonly employed, such as Igepon T-77 (a sodium salt of fatty acid amide sulfonate), Blancol (the sodium salt of sulfonated naphthalene-formaldehyde condensate) and Marasperse N (a lignosulfonate) . The

lactams also guarantee good formulation and tank mixing capability with the most common active ingredients.

Certain synthetic fibers, for example polyesters, nylons, orlon and fiber blends, are difficult to dye because they provide insufficient ionic sites on which the dye can attack. Accordingly, dying of such fibers or fabrics is-usually effected with disperse dyes which require no complexing function for color development. However, one objection to this type of dying is that the product does not possess high color fastness. The present nonionic surfactant/complexing lactams which lower surface tension and interact with both anionic and cationiσ substances, promotes acceptance of non-disperse dyes such as for example the acid dyes, cyanine dyes, anthraquinone dyes, guinoline dyes and thiazole dyes on relatively difficult dyeable materials while simultaneously providing faster release and higher exhaust of the dye from carrier and onto the textile substrate.

Additionally, the alkyl pyrrolidones are beneficially combined with polyvinylpyrrolidone complexes and other drug carrying complexes, to transfer the drug from the complex to the skin and to promote skin penetration for more effective use of the drug. In a similar manner the present lactams provide good dye penetration in fabrics, particularly for penetration of non disperse dyes in polyester fabric.

The linear C_ to C« ₀ alkyl groups bonded to the heterocyclic nitrogen provide compounds which, in addition to their surfactant and complexing capability, are also excellent emulsifiers e.g. for paraffinic oil used in the metalworking industry.

The present lactams are also useful in the preparation of emulsifiable concentrates of agricultural chemicals which, when added to water, form a sprayable oil-in-water emulsion having dispersed phase droplets in the range of from about 0.1 to about 5 micrometers. Such an emulsion provides a uniform and accurate application of the active ingredient, eg. on the crops, and ensures uniform spreading and wetting under normal spray and weather conditions to form such emulsifiable concentrates. The- lactams of this invention are combined with at least one other a photeric, anionic, non-ionic or cationic surfactant in a weight ratio of between about 1:10 and about 1:0.8 preferably between about 1:9 and about 1:1 at 15-3Q ^β C. Suitable co-surfactants include EMULPHOR® EL-620 (polyethoxylated av. 30 castor oil); EMULPHOR® EL-719 (polyethoxylated av. 40.castor oil); IGEPAL® CO-630 (ethoxylated av. 9 nonylphenol) ; IGEPAL® ^■ CO-530 (ethoxylated av. 6 nonylphenol); KATANOL® L-2 (trichlorobenzene) , MIRANOL® DN (a stearoa phoacetate) ; SPAN® 40 (sorbitan monopaImitate), ANTARON® (a carboxyl σocoimidazoline) , FENOPON® (coconut or myristic acid ester of sodium isethionate) and alkylamine guanidine polyoxyethano1.

Such emulsifiable concentrates are particularly useful in the preparation of herbicidal, fungicidal and insecticidal stable or fast breaking emulsions.

The anti-corrosion properties of instant pyrrolidones make them valuable corrosion inhibitors in oil well drilling acidification and many other fields such as prevention of corrosion of dairy equipment as well as in petroleum processing and acidizing and in plating baths. Aerosol sprays combining the surfactant, detergency and anti-corrosive properties of the present lactams, particularly the pyrrolidone lactams, can be used for cleaning and protection of automobiles, trucks, etc.

The C~-C. - alkyl species are particularly effective against corrosion by inorganic acids, e.g. HCl, phosphoric acid, sulfuric acid by reason of their complexability both with the acid and with the metal oxides formed by corrosion. The N-alkyl-2-pyrrolidones herein described are absorbed on the surface of a metal and provide a hydrophobic layer between the metal and the attacking acid, thus protecting the metal from acid corrosion.

The pyrrolidone products of this invention are also excellent viscosity builders, the higher molecular weight species being outstanding. Accordingly, these pyrrolidones can be added to liquid formulations to provide gels or pastes. This application is extremely desirable where noxious or skin irritating liquid chemicals of low viscosity are employed. For example, gels or pastes of strong acids can be provided to eliminate splattering or fuming and more viscous compositions containing the active chemical can be applied for retention on vertical surfaces, e.g. to effect rust • removal.

The electron rich N-alkylphenyl-pyrrolidones are used to coat electron defficient surfaces, such as polyester films and fibers. These aryl pyrrolidones provide excellent adhesion and reduced amounts can be used to obtain a satisfactory microthin coating.

Because of their surfactant properties, the present pyrrolidones also hinder the formation of hard water precipitates. Still further these products, which possess high plastic substantivity, provide internal and ^: external lubricity to polymeric products such as those which are made from or contain polystyrene, polyethylene, polypropylene, polyvinyl chloride, nylon, cellulose acetate, polyvinyl acetate, phenolic resins, polyvinyl pyrrolidone, etc. Surface lubricating effects on metals

have also been noted. Selection of individual N-alkyl pyrrolidones of the C.-C-- alkyl species or combinations thereof provide the effects mentioned above in finished formulations and other effects which will become apparent from the present disclosure.

Still another field in which the present lactams find application is in dry cleaning. Dry cleaning solvents generally fall into two categories, namely the petroleum solvents and the halogenated solvents which include Stoddard solvent (a petroleum distillate between gasoline and kerosene), carbon tetrachloride, trichloroethylene, perchloroethylene, fluorinated hydrocarbons, 104F solvent, etc. Although these solvents are satisfactory for the removal of fatty type soils, many water soluble spots and stains, eg. tea, fruit, wine, ink and beer stains, are not removed. However, when the present solvent soluble lactams are added to the formulation such water insoluble stains are easily removed. These lactams, particularly the pyrrolidones herein defined, complex with acidic molecules, labile protons, polarizable molecules and color forming components. They also complex with odor causing components in human perspiration this minimizing or eliminating odor retained in clothing including polyester fabrics. The present lactams are also efficacious in removing soil and stains when added to a standard laundry detergent. The effective amount of lactam incorporated in dry cleaning or laundry detergents for the above purposes is generally at least 1% by weight, preferably between about 2% and 50% by weight of the total formulation. As a specific spot and stain remover, however, the present lactams, particularly the pyrrolidones can be used individually or in admixture in 100% concentration with no additive. For effective stain removal, usually an amount which wets the entire stain will suffice to give desired results.

In view of the diverse fields of application in which the present compounds are beneficially employed, it will be appreciated that widely varying amounts of these compounds can be used to fulfill their requirements and other functions which may become obvious. Generally, between 100% and about 0.001% of these surfactants depending upon their use as a compound per se or as an additive to an existing formulation will become apparent. More specifically, when one or more of the present products is used an an anti-static spray or stain remover, up to 100% of the active ingredient can be the present pyrrolidone or a blend thereof. On the other hand, when the present product is an additive in a laundry, dishwashing or. cosmetic formulation, its concentration can be as low as 0.001%. For complexing, the concentration of pyrrolidone depends entirely on the chemical nature of the dompound and the amount of drug, agricultural chemical or other. active component one desires to' incorporate. Generally, the amount employed is within the mole ratio range of between about 0.5:1 and about 99:1 lactam to active component and an amount at least sufficient to retain the beneficial characteristics of the lactam but not more than the amount needed to preserve the effect of the active component being complexed. Shampoo and hair care applications generally use from about 1% to about 20% by weight of the present lactams based on total compositions; whereas skin care and other cosmetics may employ as little as 0.001 wt. %, preferably between about 2% and about 0.01% by weight of the lactam based on total composition. As viscosity builders, up to 80% of the product may be present in the formulation. Most often, the amount of lactam product employed is the same or somewhat less than that amount used for agents having a similar property in the same field of application.

Having thus described the invention, reference is now had to the following examples which set forth preferred embodiments but which are not to be construed as limiting to the scope of the invention as more broadly described above and as set forth in the appended claims. It should be recognized that these examples are presented only to more specifically describe the invention, to exemplify preferred embodiments and to provide representative examples of use from which other uses and applications will become apparent.

EXAMPLE I

Into a stainless steel autoclave was introduced n-octylamine (2342 g) and butyrolactone (1704 g) in a mole ratio of about 1:1.1. The autoclave was sealed and 100 psig of nitrogen applied and the contents heated to 275°C. and held for 8 hours during which time the reaction mixture was agitated and the pressure increased from atmospheric to about 480 psig. The reaction produced a liquid product which was recovered from the autoclave and distilled to produce 98.5% pure clear water white liquid N-octyl-2-pyrrolidone in a yield of 98% and having a boiling point of 118°C. at 0.5 mm of Hg, a viscosity of 8 cps, and a pH of 6.5 (10% in 50/50 isopropyl alcohol-water) .

EXAMPLE II

The procedure described in Example I was repeated except that decylamine was substituted for n-octylamine and the reaction product was distilled to provide 99.3% pure clear, water white liquid N-decyl-2-pyrrolidone in a yield of 98% and having a boiling point of 120°C. at 0.2 mm of Hg, a viscosity of 12 cps, and a pH (10% in 50/50 isopropyl alcohol-water) of 5.4.

EXAMPLE III

The procedure described in Example I was repeated except that dodecylamine (Armeen 12D) was substituted for n-octylamine and the reaction product was distilled to provide 99.2% pure clear, water white liquid N-dodecyl-2-pyrrolidone in a yield of 99% and having a boiling point of 145°C. at 0.2 mm of Hg, a viscosity of 17 cps, a cloud point (10% H_0 soln.) of 15-19°C, and a pH (10% in 50/50 isopropyl alcohol-water) of 7.3.

EXAMPLE IV

The procedure described in Example I was repeated except that tetradecylamine was substituted for n-octylamine and the reaction product was distilled to provide 96.9% pure clear, water white liquid N-tetradecyl-2-pyrrolidone in a yield of 95% and having a boiling point of 190 ^β C. at 1.0 mm of Hg, a viscosity of 2 cps, a cloud point (10% H^O soln.) of 33 ^β C, and a pH (10% in 50/50 isopropyl alcohol-water) of 5.9.

EXAMPLE V

The procedure described in Example I was repeated except that hexadecylamine (Armeen 16D) was substituted for n-octylami,ne and the reaction product was distilled using a hot water condenser and was discharged at about 70 ^β C. to provide 94.5% pure N-hexadecyl-2-pyrrolidone solid in a yield of 90% and having a boiling point of 180°C. at 0.1 mm Hg.

EXAMPLE VI

The procedure described in Example I was repeated except that octadecylamine (Armeen 18D) was substituted for n-octylamine and the product was stripped of water and excess butyrolactone and was discharged at about 75°C. to provide 96% pure N-octadecyl-2-pyrroli one solid in a yield of 96%.

EXAMPLE VII

The procedure described in Example I is repeated except that eicosylamine is substituted for octylamine and the product distilled using a warm water condenser and was discharged at about 85°C. to provide 95% pure N-eicosyl-2- ' pyrrolidone solid in a yield of about 90%.

EXAMPLE VIII

The procedure of Example I was repeated except that 2-ethylhexylamine was substituted for n-octylamine. The reaction product was distilled to provide 99.5% of pure clear water white liquid N-2-ethylhexylpyrrolidone-2, boiling at 92-97"C. at 0.06 mm Hg in 96% yield.

EXAMPLE IX

The procedure of Example I was repeated except that Primene 81R (a tertiary C. _-C.. alkyl primary amine) was substituted for n-octylamine. The reaction product was distilled to provide 97% pure liquid alk lpyrrolidone product in 40% yield. This product boils at 112-115°C. at 0.7 mm Hg.

EXAMPLE X

The procedure of Example I was repeated except that t-octyl primary amine was substituted for n-octylamine. The reaction product was distilled at 98-102°C. and 0.5 mm Hg to provide 99.3% pure product in 50% yield.

EXAMPLE XI

The procedure of Example I was repeated except that C -naphthyl amine is substituted for n-octylamine. The reaction in this case yields a solid product which is recovered from the autoclave and distilled to provide 99% pure product in 50% yield. Product has a melting point of 110-112 ^β C.

The same procedure is employed to produce N-alkyl naphthyl lactams by substituting the appropriate N-alkyl naphthyl amine for naphthyl amine in this example.

EXAMPLE XII

The procedure of Example I was repeated except that aniline is substituted for n-octylamine. The product is recovered from the autoclave and distilled at 123°C. under 0.2 mm Hg to provide 99% pure product in 50% yield.

The same procedure is employed to produce N-aIkylaniline lactams by substituting the appropriate N-alkylaniline for aniline in this example.

EXAMPLE XIII

The procedure of Example I was repeated except that cocoamine distillate was substituted for n-octylamine. The reaction product was stripped of water and excess butyrolactone and discharged. The product was obtained in 96% purity and 97% yield.

EXAMPLE XIV

The procedure of Example I is repeated except that caprolactone is substituted for butyrolactone and hexadecyl amine is substituted for n-octylamine. The product,

is recovered in 90% yield and purity.

EXAMPLE XV

Preparation of N-n-decyl-2-pyrrolidone

In a glass reactor, 19 g (0.22 M) of -butyro- lactone and 34.6 g (0.22 M) of n-decylamine are mixed and heated to 180° in a round bottom flask equipped with a condenser and a Dean-Stark trap for 22 hours. The dark brown reaction mixture is distilled at reduced pressure to yield 50 g (82.5%) of colorless product; b.p. 150°-155°/0.5-l mm Hg.

EXAMPLE XVI

Preparation of N-n-octyl-2-caprolactam having the formula

Following Example XV, heating 17.5 g (0.153 M) of 6-hexanolactone and 22 g (0.17 M) of 1-aminooctane at 180° for 29 hours gives 9 g (27%) of product; b.p. 155°-160°/0.5 mm Hg.

EXAMPLE XVII

Preparation of N-n-nonylcaprolactam having the formula

Following Example XV, heating 23 g (0.2 M) of -hexanolactone and 28.65 g (0.2 M) of 1-aminononane at 80° for 20 hours gives 11.5 g (26%) of product; b.p. 55 ^β -165°/0.6 mm Hg.

EXAMPLE XVIII

Preparation of N-n-heptyl-2-caprolactam having the formula

In a 1 liter 3-neck flask equipped with a water condenser, an addition funnel and a mechanical stirrer is placed 10.2 g of 50% sodium hydride-mineral oil dispersion (5.1 g NaH, 0.2125 M) and 150 ml of petroleum ether. The suspension is momentarily stirred and then sodium hydride is allowed to settle. Most of the petroleum ether is pipetted out and 200 ml of dry toluene is added, after which a solution of 20 g (0.177 M) of 2-caprolactam-2-one in 100 ml of dry toluene is added. The mixture is refluxed for 1 hour and then cooled to room temperature. A solution of 38.8 g (0.25 M) of 1-bromoheptane in 100 ml of dry toluene is added dropwise under stirring. Upon completion of the addition, the mixture is warmed to 80°-100 ^β and the temperature was maintained for 4 hours. The reaction mixture is then heated to reflux for 18 hours to give 90% of a colorless product having a b.p. of 155 ^β -158 ^β C. at 0.5 mm Hg.

EXAMPLE XIX

Preparation of N-n-decylcaprolactam having the formula

Following Example XVIII, 10.2 g of 50% sodium hydride-mineral oil dispersion (5.1 g NaH, 0.2125 M), 20 g (0.177 M) of azacycloheptan-2-one and 44.2 g (0.2 M) of 1-bromodecane on 19 hr. reflux gives 38 g (84.7%) of product; b.p. 158 ^β -163°/0.25-0.3 mm Hg.

EXAMPLE XX

Preparation of N-n-dodecylcaprolactam having the formula

10 Following Example XVIII, 15.3 g of 50% sodium hydride-mineral oil dispersion (7.65 g NaH, 0.319 M) , 30 g (0.266 M) of azacycloheptan-2-one and 66.1 g (0.265 M) of 1-bromododecane on 20 hours reflux gives 58.9 g (80%) of colorless product; b.p. 175°-180°/0.3 mm Hg.

15 EXAMPLE XXI SURFACE TENSION

Surface tension measurements in triplicate were made for each of the N-alkylpyrrolidone species listed below in Table 1, using a Fisher Surface Tensiomat (Model

20 #21, Der Nouy Ring Tensionometer) . Each experiment was carried out as follows.

Distilled water solutions at concentrations noted

* in Table 1 were prepared for each of the following surfactants in 100 ml glass flasks. The solutions were

"25 stirred for about 15 minutes until homogeneous solutions were obtained. The surface tensions of these solutions were then measured.

The averaged results of the above tests are reported in Table 1.

TABLE 1

Surface Tension of Aqueous Solutions at 25°C. (dynes/cm) % Solution in Distilled Water

Product 1.0% 0.1% 0.01% 0.001% 0.0001%

Octyl pyrrolidone — 30.4 54.25 68.4 —

Decyl pyrrolidone 2 277..66 27.5 27.8 51.0 —

Dodecyl pyrrolidone ! —^"™ 26.7 27.6 29.9 55.4 Tetradecyl ..... 26.4 26.5 30.4 47.5 pyrrolidone

Surface tension data indicates that these products have strong surface activity, i.e., lowering the surface tension of water. From the surface tension data, the surface excess concentration A (moles/cm ), area/molecule (a A )* at the interface and efficiency of adsorption, (pC„ _n )** at the solution/air interface were computed by use of appropriate Gibb's Adsorption Equation:

_r = surface excess concentration (moles/cm2) dV = change in surface or interfacial tension of the solvent

R = 8.31 x 10 ergs mol~ c = Molar concentration of solution

T = Absolute Temperature

* Absorption °A2

** The negative logarithm of the surfactant concentration required to lower surface tension by 20/ dynes/cm.

EXAMPLE XXII

The critical micelle concentration (CMC), the surface concentration at the liquid-air interface (j.) , the area of the test molecule at the interface (am) and the effectiveness of adsorption at the interface (pC-20) were determined on the above surface tension data reported in Example XXI, Table 1. These properties are reported in Table 2 below.

TABLE 2

SURFACE ACTIVITY PARAMETERS CALCULATED FROM SURFACE TENSION MEASUREMENTS

Molecule CMC (ml ^"1 ) 1 m(mcm x 10 _/ f 2

^{I 0} > am (A) pC-20 N-n-octyl pyrrilidone - 4.2 39.5 3.20 N-n-decyl pyrrolidone 4-4 x 10 ^" 4.6 36.1 4.51 N-n-dodecyl pyrrolidone 4.7 x 10 ^"5 4.5 36.9 5.27 N-n-tetradecyl pyrrolidone 5.7 x 10 ^"5 3.1 53.6 6.25 lauryl dimethyl amine oxide* 2.1 x 10 ^~3 * 2.8 59.3 5.23

* Literature value Tm= 3.5 x 10 -10 cm-1 am= 47 A ^Δ (SURFACTANTS AND INTERFACIAL

PHENOMENA by Rosen, page 68).

More specifically, the CMC of the N-(n alkyl) pyrrolidones tested show a minimum (4.7 x 10~ ) at the C- - chain length. Using the empirical equation for n-lauryl (C _{] ?} ) alcohol ethoxylate,

where A number of ethylene oxide at 23°C», the pyrrolidone ring would be expected to behave as 2 ethylene oxide units. However, the pyrrolidone ring is actually producing results equivalent to about 6 ethylene oxide units, i.e. at 25°C, n-C ₁₂ H _2g (ethylene oxide) . OH (CMC = 4 x 10~ ) and ⁿ " ^C 12 ^H 25 ( ^eth Y ^lene oxide ⁾ _? 0H ⁽ CMC = 5 x 10~ ⁵ ). The hydrophilic-lipophilic balance (HLB) of N-n-dodecyl pyrrolidone, based on the assumption that the pyrrolidone ring simulates 2-6 ethylene oxide units is 6.5. - 11 using the equation % ethylene oxide/5 = HLB. The low apparent HLB suggests the material would be a good water-in-oil emulsifier, .e.g. in skin care products.

The surface concentration £ , in moles per

2 cm indicates the maximum surface concentration of surfactant, i.e. at equilibrium above the CMC, and is obtained by an estimation of a constant d 2f /dc* from the surface tension vs. concentration. The N-(n alkyl) pyrrolidones obtain a maximum Tm (4.6 x 10 -10m cm-2) at N-C- ₀ H ₂₁ chain length. In general, the Tm for all of the N-n alkyl pyrrolidones is very high in comparison to all, but the less soluble alcohol ethoxylates, i.e. -C ₁₂ H _2g (ethylene oxide).0H (Tm = 3.8 x 10 ^" m cm ^" ) n-C.. _J .H-- (ethylene oxide)^OH (Tm = 4.4 x 10 -10m cm-2) ³ . The mono disperse nature of the hydrophobe and hydrophile is believed to contribute to high surface concentrat ons by maximizing enthropy of packing.

* d y /dc = the change in surface tension with respect to the change in surfactant concentration.

As the interface becomes saturated with surfactant molecules, one would expect that within a homologous series, the longer hydrophobic chains would sterically hinder more surfactant molecules from positioning themselves at the interface. The decrease in

Tm of the C _g Hτ ₇ vs. the ^C I _Q ^H 23 ^cll i ⁿ ^ ^s attributed to the hydrophile/hydrophile interactions of the n-octyl-2-pyrrolidone. Above the C. _Q H-, alkyl chain length, normal steric hinderance of the hydrophobes determines Tm. a 2

The area per molecule (A ) is relative to the Tm, in a comparison of a homologous series. Generally, the area per molecule increases with increasing chain length of the N-(n alkyl) pyrrolidones; however, the larger am of the n-octyl pyrrolidone is attributed to an attraction of pyrrolidone moieties not balanced by the alkyl chain attractions. The low am of the N-(n alkyl) ^* pyrrolidones approaches the theoretical size (20 °A2) for an aliphatic chain oriented perpendicular to the interface. The negative logorithm of the surfactant concentration required to lower the surface tension by 20 dynes/cm can be used as a measure of the efficiency of adsorption since ϋ is approaching the maximum value. The N-(n alkyl) pyrrolidones actually show a progressively higher efficiency of adsorption as the alkyl chain is increased.

EXAMPLE XXIII FOAM TESTING

(A) RELATIVE FOAMING PROPERTIES - ROSS MILES FOAM TEST

To determine the sudsing characteristics of the pure compounds, Ross Miles sudsing tests were conducted on 1.0% surfactant SQlutions in distilled water at ambient

( ^ _* 25 ^β C.) temperature. The results indicate that the N-alkylpyrrolidones are low foamers, when compared to fatty alkyl benzene sulfonates, fatty alkyl ethylene oxide sulfates, fatty alkyl dimethyl amine oxides, and fatty alkyl alkanol amides. The low sudsing is maximized at the C. ₂ alkyl chain length.

Solutions of 1% by weight of for each surfactant in distilled water noted below were made up. Into a graduated glass cylinder was poured 50 ml of a given 1% solution and another 200 ml of the same solution was dropped into the first 50 mis. from a height of 90 cm. The foam height developed in the cylinder was measured by the cylinder graduations. The results of these tests are reported in following Table 3.

TABLE 3

Ross Miles Suds: Lng Data in ml of foa ,m (1 .0% Surfactant in

Distilled Water at Ambient Temperature , 25° C. - Average 2 Runs)

Breakdown Time Total Breakdown (Min. ) (Min.)

Product 0 5 10 Initial-Final

Octyl Pyrrolidone 25.0 6.0 5. 5 19.5

Decyl Pyrrolidone 24.5 24.5 24. 0 0.0

Dodecyl 26.5 26.5 26. 5 0.0 Pyrrolidone

Tetradecyl 18.0 18.0 18. 0 0.0 Pyrrolidone

Dodecyl Benzene 175 166 146 28.0 Sulfonate

Alipal C0-436( ¹ ) 167 166 166 2.5

Gafamide 160 160 160 0.0 CDD-518(2)

Ammonyx MO(3) 167 167 167 0.0

Ammonyx LO^' 188 188 185 3.5

Aro ox DMC- ^ ⁵ ) 191 191 190 2.0

Control (Dist. 0.0 0.0 0.0 0.0 (Water)

(1) The ammonium salt of sulfated nonylphenoxypoly (ethyleneoxy) ethanol (supplied by GAF Corp.). (2) Coconut oil diethanolamine condensate (supplied by GAF Corp.).

(3) Myristyl dimethylamine oxide.

(4) Lauryl dimethylamine oxide.

(5) Dimethyl cocamine oxide. ^'

(B) SUDS BOOSTING PROPERTIES

Since the N-(n alkyl)-2-pyrrolid'ones are neutral molecules at pH 7 and above, they should increase the density of the anionic surface layer and act as suds boosters for both linear alkyl benzene sulfonates and ethylene oxide based products. Ross Miles sudsing data (0.5% surfactant/0.5% suds booster) indicate the N-(n alkyl) pyrrolidones are highly effective in boosting and stabilizing the foam of linear alkyl benzene sulfonates. The N-decylpyrrolidone appears to be the most efficacious of the compounds tested in boosting the foam of Alipal C0-436. This property of the present N-(n alkyl) pyrrolidones is important in laundry, dishwashing, soap bars, cleansing creams, flotation deinking, and use as foam markers, etc. The sudsing data is shown in Table 4.

TABLE 4 ROSS MILES SUDS TESTS- BOOSTING/STABILIZING OF LINEAR DODECYL BENZENE SULFONATE (LAS) AND NONYLPHENOL ETHYLENE OXIDE-S* BY N-n-ALKYL PYRROLIDONES (0.5% surfactant/0.5% pyrrolidone booster at ambient temperature)

Foam Height (mm)

Surfactant Suds Booster Breakdown (min.) Total Breakdown (Min) 0 5 10 from initial to final

LAS N-C _a alkyl-2-pyrrolidone . 195 194 184 10.5 LAS N-C, ₀ alkyl-2-pyrrolidone 204 202 202 2.0 LAS N-C, 2alkyl-2-pyrrolidone 163 163 163 0.0 LAS N-C, ,alkyl-2-pyrrolidone 127 127- ^' 127 0.0 LAS none 175 166 147 28.0

ALIPAL C0-436 N-C ₈ alkyl-2-pyrrolidone 185 183 183 2.0 ALIPAL CO-436 N-C, ₀ alkyl-2-pyrrolidone 202 200 199 2.5 ALIPAL C0-436 N-C, ₂ alkyl-2-pyrrolidone 176 176 176 0.0 ALIPAL C0-436 N-C,,alky1-2-pyrrolidone 148 148 148 0.0 ALIPAL C0-436 none 167 166 166 1.5

* ethylene oxide sulfate salt

(C) FOAM "BOOSTING" IN MANUAL DISHWASHING FORMULATION

To determine how the present N-(n-alkyl) ~ -pyrrolidones would function in a consumer-type dishwashing product, they were tested at 40°C. in the basic formula shown in Table 5.

TABLE 5

Model Dishwash Formula

Component Wt. %

Water 65. . 0

Ethanol 11 . . 7

* Alfonic 1412-A (100% act.) 13. . 3

** Alfonic 1412-40 1 . . 1

NaCl 0. . 9

N-alkyl— yrrolidone suds "booster" 7. , 5 Misc. (from Alfonic 1412-A) 0. 5

TOTAL 100.0 The data indicates that without soil at ambient temperature ( v 25 ^β C), in 100 ppm hardness (3/2, Ca/Mg), the suds booster efficiency of the N-(n-alkyl) pyrrolidones (from N-C _ft to C.. alkyl) decreased with increasing chain length. The octyl pyrrolidone showed higher suds levels, increased from 147 mm to 158 mm. The C. , and C- . pyrrolidones decreased the suds level of the model formula from 147 to 138 and 147 to 118 mm respectively.

* a sulfated, ethoxylated alcohol derivative - an anionic biodegradable surfactant

** 40% ethoxylated linear alcohol - a nonionic biodegradable surfactant

- 4.2 -

(D) EFFICIENCY OF FOAM BOOSTING IN PRESENCE OF SOIL

A soil mixture of 47 wt. % bleached flour, 4-8 wt. % of partially hydrogenated vegetable oil shortening (Crisco) and 5 wt. % of oleic acid was mixed and heated to 50°C. to form a slurry. To an aqueous solution containing 0.15% N-alkyl-2-pyrrolidone in 100 ppm hard water was added 0.1% of the above slurry and mixed for 10 minutes at 40 ^β C. The results of this series of tests is reported in Table 6.

TABLE 6

Ross Miles Sudsing Data at Ambient Temperature (0.15% Product Use Level - Table 5 composition 100 ppm water hardness, 3/2-Ca/Mg)

Foam Height (mm) Breakdown Time ^" 5 Suds Booster (Min. )

(7.5% of Product 0 5 10 n-octyl 158 158 158 pyrrolidone n-decyl 154 153 153 _Q pyrrolidone n-dodecyl 138 138 138 pyrrolidone n-tetradecyl 118 118 118 pyrrolidone 5 Product with 147 147 147 no booster

Commercial "Joy" 154 154 154

Of the samples tested, after 5 minutes no foam breakdown had occurred.

EXAMPLE XXIV

WARING BLENDER LATHER TEST

Several samples to be tested sere prepared in 1500 ml glass beakers by mixing 47.95 wt. % of deionized water at 60°C. with 50 wt. % surfactant and 0.6 wt. % of the foam booster (100% active) to be tested while agitating constantly with an electric stirrer. The resulting solution was allowed to cool to 40°C. whereupon 0.05 wt. % of Kathon CG* preservative was added. Stirring was continued until the solution cooled to room temperature.

A control solution was prepared for each surfactant used in the same manner except that foam booster was omitted from the control formulations and 49.95 wt. % of deionized water was employed.

Each of the above solutions was subjected to a Waring Blender- Lather Test which entailed introducing 100 ml of the test or control solution at 25°C. into a high speed Waring Blender operated at 21,000 RPM. Following agitation for one minute, the foam is transferred to a 1000 ml. graduated cylinder and the foam volume in ccs recorded. The results of these tests are reported in the following Table 7.

Although the initial foam height of the control is greater the foam comprises large loose bubbles, hence the -foam density is significantly lower. Also the foam of the control collapses within about one minute; whereas the foams obtained with the present lactams comprise small densely packed bubbles and are stable beyond 5 minutes.

N-methylchloroisothiazol inone + methylisothiazoline

TABLE 7

Surfactant^ lauryl sulfate

FOAM BOOSTER . FOAM VOLUME (cc/100 ml test solution)

Initial

N-dodecyl-2-pyrrolidone 460 coconut diethanol amide (GAFAMIDE CDD-518) 425 lauryl dimethylamine oxide (Ammonyx LO) 450 cocamidopropyl betaine 485 cocamidopropyl hydroxy sultaine 460

Control 600

Surfactant ² Na laureth sulfate (3moles ethylene oxide)

FOAM BOOSTER

N-dodecyl-2-pyrrolidone 435 coconut diethanol amide 420 lauryl dimethylamine oxide 430 cocamidopropyl betaine 515 cocamidopropyl hydroxy sultaine 415

Control 500

Surfactant^ ammonium lauryl sulfate

FOAM BOOSTER

N-dodecyl-2-pyrrolidone 215 coconut diethanol amide 140 lauryl dimethylamine oxide 170 cocamidopropyl betaine 325 cocamidopropyl hydroxy sultaine 410

Control 500

EXAMPLE XXV

WETTING TEST - DRAVE METHOD Into 99.9 ml of distilled water, 0.1% by weight of the N-alkyl-2-pyrrolidone noted in Table 9 was dissolved. The resulting aqueous solution is poured into a one liter glass volumetric flask and 5 g of 100% cotton yarn weighted with a 3 g hook was droped into the beaker. The time required for the yarn to sink below the surface of the aqueous wetting solution is reported in Table 8. Wetting tests for each of the following N-alkyl-2- pyrrolidone species were run in triplicate.

TABLE 8

DRAVE' S WETTING DATA AT 25°C. + 1°C.

Product Time in Seconds

N-Octyl pyrrolidone 4.4

N—Decyl pyrrolidone 68.5

N-Dodecyl pyrrolidone 93.5

N-Tetradecyl pyrrolidone 109.3

The wetting efficacy of the N-n C_ to C« ₀ alkyl pyrrolidone series decreases with increasing molecular weight. Of the series, the C ₈ - and probably the C ₇ - alkyl compounds could be considered excellent wetting agents (4.4 seconds wetting at 0.1% for C_- alkyl-2-pyrrolidone) .

EXAMPLE XXVI

SOLUBILITY OF N-ALKYL PYRROLIDONES Separate 10% by weight solutions of N-alkyl-2-pyrrolidone in the following liquids were made up in 50 ml glass beakers and the solubilities at about 25°C. were noted and reported in following Table 9.

TABLE 9 10% PRODUCT SOLUBILITY AT 25°C - 1°C

SOLVENT N-octyl- -2- N-decyl -2- N-dodec :yl- -2- N-tetradecyl- •2- pyrrolidone pyrroli( one pyrrolidone pyrrolidone

Water I . PS* s* s*

Acetone S S S S

Ethanol S S S S

Xylene S S S S

Heptane S S S S

Paraffin Oil S S PS S

Stoddard Solvent (1) s** S PS S

Perchloroethylene s S S S

I- insoluble; PS= partially soluble (cloudy translucent); S= soluble, clear

(1) US Bureau of Standards specification- a clear, water white petroleum distillate *Soluble with slight haze **Very slight precipitation

The data indicates that alkyl pyrrolidones are soluble in various types of solvents. Although octyl pyrrolidone is insoluble at room temperature in water, decyl pyrrolidone is slightly soluble and dodecyl pyrrolidone and tetradecyl pyrrolidone are completely soluble in water at 10% concentration. However, dodecyl pyrrolidone and tetradecyl pyrrolidone exhibit iridescence phenomena at the 1% to 2% level in aqueous media (violet color at 2% and greenish at about 1%) which was destroyed in the presence of small amount of electrolyte.

It was also observed that 10% aqueous solution of tetradecyl pyrrolidone and dodecyl pyrrolidone become cloudy at about 33-34°C. and 31-32 ^β C. respectively exhibiting cloud point phenonomena. The aqueous solubility of the dodecyl and

^■ tetradecyl products is interesting, i.e. below 1% (wt. %) solute, the solutions are clear. Between 1 and 2% the solutions exhibit a scattering pattern (breaks light into its visible spectrum) for visible light indicating a regular geometric pattern which could be regular crystalline spacing (lamellar type) or a monodisperse liquid crystal particle. Above 2% the solutions again become clear, suggesting a self dissolving effect (loss of regular geometry). This effect once again demonstrates the purity of these compounds. It is postulated that blends of n-alkyl chains would decrease the ability of these materials to form lamellar type structures and increase the agueous solubility of the less soluble compounds (C„ and C- _Q ). Also it has been observed that low levels of electrolyte eliminate the "prism effects" shown by the 1-2% solutions of the . ^-C _ compounds.

The solubility of the present pyrrolidones in both water and in nonpolar solvents such as heptane and perchloroethylene make them useful in nonaqueous applications such as dry cleaning detergents, solubilizers for water in fuels, and cleaners for the removal of solid fatty soil from hard surfaces.

EXAMPLE XXVII

The viscosities in cps of the following surfactants at various concentration in distilled water were measured at about 25°C. using a Brookfield Viscometer (LVT Model). The results of these tests are reported in following Table 10.

TABLE 10

VISCOSITY (CPS) AT VARIOUS WEIGHT % WATER CONCENTRATIONS

PRODUCT 100% 10% 8% 6% 4% 2

N-octyl-2-pyrrolidone 8.0 - - - - ••

N-decyl-2-pyrrolidone 12.0 - - - - -

N-dodecyl-2-pyrrolidone 17.0 20.0 16.0 12.5 7.5 6.5

N-tetradecyl-2-pyrrolidone 20.0 145.0 100.0 96.0 66.0 24.5

Ammonyx L0 - 7.0 - - - 4.0

Ammonyx MO _ 52.5 _ _ _ 7.0

Control (distilled water) 1.0

The above viscosity of alkyl pyrrolidones and their aqueous solutions were obtained using a #2 spindle at a speed of 30 rpm, and a #2 spindle at a speed of 60 rpm respectively.

Data indicates that viscosity of the ⁽ 100% active) alkyl pyrrolidone increased as the carbon chain length of alkyl group increased.

Both tetradecyl and dodecyl pyrrolidone exhibit a significant thickening increase. The higher viscosities of the N-n alkyl pyrrolidones vs. dimethyl fatty amine oxides of similar chain length indicate that the micelles of the N-n alkyl pyrrolidones are lamellar or rod shaped as compared to spherical types for the amine oxides.

EXAMPLE XXVIII VISCOSITY BUILDING

Several samples to be tested were prepared in 1500 ml glass beakers by mixing 47.9 wt. % of deionized water at 60°C. with 50 wt. % surfactant and 0.6 wt. % of the viscosity builder (100% active) to be tested while agitating constantly with an electric stirrer. The resulting solution was allowed to cool to 40°C. whereupon 0.05 wt. % of Kathon CG preservative was added with stirring and the solution allowed to cool to room temperature. _ς A control solution was prepared for each surfactant used in the same manner except that viscosity builder was omitted from the control formulations and 49.95 wt. % of deionized water was employed.

The viscosity was measured in cps for each of the _Q above solutions by adding 20% NaCl solution from a glass pipette in 2 ml increments until the peak viscosity break point was reached. Anhydrous sodium chloride was used when requirements exceeded 4% NaCl by weight. The results of these tests which report the viscosity at the break = point for each test solution and for each control are reported in the following Table 11.

TABLE 11

SURFACTANT= Na lauryl sulfate VISCOSITY (CPS)

Viscosity Builder

N-dodecyl-2-pyrrolidone 12,285 coconut diethanol amide 13,000 lauryl dimethylamine oxide 10,140 cocamidopropyl betaine 17,850 cocamidopropyl hydroxy sultaine 12,425

Control 1,850

SURFACTANT^ Na laureth sulfate (3 moles ethylene oxide)

Viscosity Builder

N-dodecyl-2-pyrrolidone 40,000 coconut diethanol amide 36,820 lauryl di ethylene oxide 31,590 cocamidopropyl betaine 55,680 cocamidopropyl hydroxy sultaine 54,540

Control 30,000

SURFACTANT= Ammonium lauryl sulfate

Viscosity Builder

N-dodecyl-2-pyrrolidone 40,000 coconut diethanol amide 33,200 lauryl dimethylamine oxide 37,270 cocamidopropyl betaine 54,590 cocamidopropyl hydroxy sultaine 28,180

Control 6,360

Protonat

T pyrrolidon

was precip surfactant B are rather

10 solubilize the C _p and solution u following

TABLE 12

MOLAR RATIO OF HCl TO ALKYL PYRROLIDONE REQUIRED FOR

SOLUBILIZATION

N-n-alkyl group Grams of Pyrrolidone HCl (ml.) Mole Ratio Solutio

(10% Dispersion) 36.7% HCl/Pyrrolidone pH

octyl 20.0 5.2 6.2 0.22 decyl 20.0 9.7 12.8 < 0. 1

To obtain a rough figure for the protonation equilibrium constant, the equilibrium [octyl pyrroli one3

-3 was taken at 5 x 10 m. Additionally, the specific gravity of the 10% dispersion was taken at 1.0 g/cc.

2 Calculation indicates that K = 1.3 x 10 for the octyl pyrrolidone forming a cation, i.e. £octyl pyrrolidone] + [ H ] _^ ^• » C prσtonated pyrrolidone 1 .

Solubility of the present surfactants in.highly alkaline solutions is limited and the pyrrolidone ring is not hydrolyzed in such environments. However the solubility in acid is very high. Data indicate that the present N-alkyl-2-pyrrolidones are much less prone to acid hydrolysis than N-methyl pyrrolidone. Mixtures (50/50) of the N-n alkyl pyrrolidones with 36.7% HCl were made. The Cg and C- ₀ alkyl pyrrolidones were clear, viscous liquids at 25°C., while the C alkyl/HCl mix was a homogeneous, transparent gel. The C../HCl (50/50) mixture became a non—homogeneous solid at room temperature.

EXAMPLE XXX

Anti-Corrosion Testing

The 9 N-alkyl-2-pyrrolidone products listed in the following table were tested in hydrochloric acid and contacted with oil well casing material to determine their efficacy as corrosion inhibitors in oil well acidizing. Separate solutions each containing 0.4 g of the test compound in 100 mis of 15% active hydrochloric acid, were made up.

Steel Haliburton N-80 coupons used in oil well drilling were soaked in a 20% soap solution (Alkanox) for 20 minutes, then ^" brush scrubbed with yellow soap and rinsed with water and then with acetone. The coupons were dried and weighed.

After weighing, a coupon was placed in each of th beakers containing a test compound 20% HCl solution and warmed to 80°C. for 16 hours, after which the coupons were removed, rinsed, brush scrubbed with soap solution, dried a reweighed. The loss in weight of the coupon is recorded in following Table 13.

TABLE 13

Steel Casing Corrosion Inhibitor Evaluation Weight Loss

Propargyl alcohol 0 , . 21 N-decyl pyrrolidone (DP) 4 , . 10

N-octyl pyrrolidone (OP) 4 , . 20

N-dodecyl pyrrolidone (DDP) 5 . . 95

N-cyclohexyl pyrrolidone (CHP) 10 . . 97

N-methoxyethyl pyrrolidone (MEP) 14 . . 16 N-methyl pyrrolidone (NMP) 14. . 55

N-ethyl pyrrolidone (NEP) 14. , 56

N-tetr ^' adecyl pyrrolidone (TDP) 14 . , 82

N-hydrox ethyl pyrrolidone (HEP) 15. , 57

No inhibitor 27. 2 Although propargyl alcohol showed the lowest weight loss, the present N-alkyl pyrrolidones present a viable alternati and are safer chemicals.

The above experiment was repeated except that the coupons were immersed in a 5% HCl solution for 16 hours. From this data, a corrosion inhibiting curve was plotted for the above inhibitors as shown in Figure 1 wherein % weig loss is plotted against the weight of the alkyl group. 2-Pyrrolidone (2P) was used for purposes of comparison by immersing a coupon for 16 hours at 80°C. in a 5% HCl solutio containing 0.4 g of 2P. Interpolation of this curve indicat that N-nonyl-2-ρyrrolidone is at least as effective as the N-octyl or the N-decyl species. N-tetradecyl pyrrolidone

is a suitable corrosion inhibitor for weaker acids such as for example for preventing corrosion of dairy equipment in the presence of phosphoric acid cleaners? although, even in well acidization, it reduces metal corrosion by about 50%.

It is also found that the octyl, decyl, and dodecyl pyrrolidones are better inhibitors than cationic guaternary ammonium chloride in isopropanol such as the commercial corrosion inhibitor Katapone W-328, which gave a 16% weight loss of the coupons in 15% HCl. Also this dark-colored quaternary ammonium chloride which is shipped as a 75% solution in isopropanol compares unfavorably with the present alkyl pyrrolidones which are water clear, 100% active and water soluble.

EXAMPLE XXXI

The density at 25 ^β C. , heat of vaporization in kilocalorie per mole and solubility parameter was determined for the C _ft , C.-., C,^ and C.. alkyl pyrrolidone species of the invention. These parameters are reported in following Table 14.

TABLE 14

Heat of Vaporizn. Solubility

PRODUCT ^d 25°C k cal/ ole Parameter )

N-n-octyl-2-pyrrolidone 0.920 15.0 8.2

N.-n-decyl-2-pyrrolidone 0.911 18.4 8.5

N-n-dodecyl-2-pyrrolidone 0.903 18.0 7.9

N-n-tetradecyl-2-pyrrolidone 0.896 19.7 7.8

The present compounds possess dye transfer properties which permit better penetration of a dye into a cellulosic substrate. Accordingly, the present compounds are useful vehicles for dyeing or printing.

EXAMPLE XXXII

A 50% black dye formulation of 1:1.5 triarylmethane dye portion of C.I. Basic Blue and a methine dye portion of C.I. Basic Violet 16, C.I. Basic Yellow 29 and C.I. Basic Orange 21, dissolved in an aqueous vehicle containing 20 wt. % of N-dodecyl-2- pyrrolidone provides improved penetration of the dye into a swatch of white orlon fabric at room temperature and high exhaustion of dye on the fabric.

Other representative formulations which suitably employ the products of this invention are presented below, although these are by no means limiting to the scope of suitable mixtures. The following formulations and compositions are prepared by conventional methods and require no detailed description. Generally the components are mixed at between about room temperature and about 100 ^β C. under ambient pressure until a uniform composition is obtained. Addition of the present lactams to any of the numerous commercial detergent and/or disinfectant solutions materially enhances their cleaning and sanitizing properties. The effective amount of lactam preferably employed ranges from about 0.2% to about 20% by volume of the total composition. The following formulations are representative.

A. Standard Dishwashing Compositions Vol. %

(i) Water 59.4

Ethanol (95%) 8.6 Alfonic 1412-A (59.3% (ethylene oxide sulfate) 22.5

Alfonic 1412-10 (linear alcohol ethoxylate) 1.1

Sodium Chloride .9

N-decyl-2-pyrrolidone 7.5

% by Wt, (ii) Sulfated nonylphenoxypoly (ethyleneoxy)

Ethanol ammonium salt 9. . 00

Cocamide diethanol amide 2 . . 50

Ethoxylated nonylphenol (10 Mol EO) 8. . 00

Nonylphenyl sulfonate (60%) 20. . 00 Sodium xylene sulfonate (40%) 9. . 00

50/50 mixture of N-n-octyl- and N-n-dodecyl-

2-pyrroli ones 3 . , 00

Fragrance 0 . . 25

H ₂ 0 48. 25

B. Machine Dishwashing Liquid by t Tetrasodium pyrophosphate 22. .00 Sodium metasiliσate 10. .00 Sodium benzoate 1. .00 Sodium xylene sulfonate (40%) 1. ,00

Glycol ether 2. ,00

Capryloamphoσarboxy glyσinate 6. ,00 50/50 mixture of N-n-oσtyl- and N-n-dodecyl- 2-pyrrolidones 3. .00 Fragrance 0. .50

H ₂ 0 54. .50

C. Bottle Washing Composition-Useful in pressure bottle washing equipment % by Wt. Cocoamphocarboxypropionate 1.00 Carbitol solvent (an alkyl ether of diethylene glycol) 1.00

Sodium Hydroxide (flakes) 20.00

N-dodecyl-2-pyrrolidone 5.00

Water - 73.00

D. General Purpose Liquid Glass Cleaner % by t

Glycol ether (Arcosolve DPM) 4. ,00

Ammonium Hydroxide (28%) I. ,00

Polyoxyethylene/polyoxypropylene block copolymer 0. .10 N-n-0ctyl-2-pyrrolidone 1. .00

Fragrance Q. ,S.

Water o 100 %

E. Fine Fabric Washing Detergent % by Wt.

Linear decyl benzene sulfonate 5.00

Coconut diethanola ide 20.00

Sodium lauryl ether sulfate (3 mol EO) 15.00 Sodium xylene sulfonate (40%) 10.00

Citric Acid to pH 7

Preservative Q.S.

Colorant Q.S.

N-n-dodecyl-2-pyrrolidone 5.00 Water to 100 %

Formulation E is particularly suited for woolen and nylon fabrics. The low surface tension of the pyrrolidone component permits high detergent action through the nap of knitted fabrics.

F. Cold Water- Phosphated Laundry Detergent % by Wt.

Sodium tripolyphosphate 50.0

Sodium silicate (2:1 ratio) 10.0

Sodium sulfate 17.5

N-C _p -C- , alkyl-2-pyrrolidone mixture 17.5

H ₂ 0 5.0 Grimey dirt and greasy sebum was easily removed by one cycle washing (15 min + 5 ^" min rinse) with the above formulation at 80°F. The test was conducted in 120 ppm water hardness.

G. Hard Surface Cleaners % by Wt. (i) Tetrasodium phosphate 0.70

Sodium metasilicate -5H 0 0.50 n-dodecyl benzene sulfonate 1.13

N-n-octyl-2-pyrrolidone 0.75

Sodium xylene sulfonate 6.80 H ₂ 0 90.12

The improved cleaning capacity of this formulation is attributed to the co-surfactant function of n-octyl pyrrolidone with n-dodecyl benzene sulfonate.

(ϋ) Sodium lauryl ether sulfate (3 Mol EO) 20.00

Coconut diethanolamide 10.00

Ethylene glycol monobutyl ether 5.00 Tetrasodium ethylene diamine tetraacetic acid (EDTA) 1.00 50/50 mixture of N-n-octyl- and

N-n-dodecyl-2-pyrrolidones 3.00

Fragrance Q.S.

Preservative Q.S.

Colorant Q.S. Water to 100%

H. Disinfectant; Sanitizing & Decontaminating Detergents

(i.) % by Wt. Bardac 205M (octyldecyl dimethyl benzyl ammonium chloride) 2.80 N-dodecyl-2-pyrrolidone 1.20

H ₂ 0 96.00

(ϋ)

Miranol C 2M-SF (dicarboxylic coconut derivative sodium salt, amphoteric) 15.00 Quaternary ammonium salt, 50%

(Decyldiraethyl octyl ammonium chloride) 2.00

Sodium carbonate 2.00

Ethylene tetraacetic acid 0.50

N-n-dodecyl-2-pyrrolidone 0.50 H ₂ 0 80.00

(iii)

Benzalkonium chloride 5 .00 Sodium carbonate 2 .00 Sodium citrate 1 .50 Nonoxynol 10 (10 av. ethoxylated nonyl phenol L)) 2.50

N-n-octyl-2-pyrroli one 5 .00 H ₂ 0 84 .00

(iv) % by t.

Lauric/myristic diethanolamide 7 .00 Sodium lauryl sulfate 6, .00

Trisodium phosphate 2. .00

Sodium tripolyphosphate 2, .00

N-n-octyl-2-pyrrolidone 5, .00

Fragrance 0. .50 H ₂ 0 77. .50

(v) % by Wt÷

Magnesium aluminium silicate 0. 90 Kelzan gum thickener 0. 45 tetrasodium EDTA 1. 00 Monazoline-0 /Imidazoline 1. 00

Hydrochloric acid (37%) 20. 00 Barquat MB-80 (alkyl dimethyl benzyl ammonium chloride) 1.25

50/50 mixture of N-n-octyl- and N-n-dodecyl- 2-pyrrolidones 3.00

Fragrance (acid stable) 1.00

H ₂ 0 71.40

* substituted imidazoline of oleic acid

The formulations H-(i) through F-(v) are particularly suited for hospital and institutional use in washing porcelain tile, tubs, toilet bowls, sinks, shower stalls, etc., associated fixtures and floors. They are also effective cleaning liquids which reduce or eliminate animal odors as may be encountered in a veternarian hospital or doctor's office or in the home, since the N-alkyl lactam possesses the property of complexing with urea and mercapto type compounds. For odor masking effects somewhat higher amounts of the pyrrolidone component, eg. up to about 10% of the formulation, may be employed, if desired.

I. General Purpose Medium Duty Liquid. Alkaline Cleaner

% by Wt.

Sodium hydroxide (50%) 1.00

Potassium hydroxide (45%) 1.50

Sodium metasilicate (anhydrous) 2.50

Sodium tri-poly hosphate 3.00

Nitrilotriacetic acid 3.00 Monateric CEM-38 (Coconut amphoteric surfactant) 2.00

Monafax 831 (a phosphate ester) 1.00 50/50 mixture of N-n-octyl- and

N-n-dodecyl-2-pyrrolidones 3.00

Fragrance 0.50 H ₂ 0 82.50

Formulation I is particularly useful for cleaning metal surfaces, ceramic tile and household appliances.

J. Dairy Equipment Liquid Cleaner % by W .

Gluconic Acid (50%) 20.00

Sodium Nonoxynol -9 phosphate* 10.00

N-n-octyl-2-pyrrolidone 5.00 H ₂ 0 65.00

* the sodium phosphate of 9 av. ethyoxylated nonyl phenol

K. Leather, Vinyl and Other Plastic Liquid Cleaner

% by Wt. Ethoxylated alkylphenol 10.00

Arcosolve PM (propylene glycol methyl ether) 5.00 Isopropyl alcohol 2.50

Amyl acetate 1.00

50/50 mixture of N-n-octyl- and N-n-dodecyl- 2-pyrrolidones 2.00

Fragrance Q.S. . Preservative Q.S.

H ₂ 0 to 100%

L. Liquid Rug Shampoo % by Wt.

Sipex 7WC concentrate (blend of ionic ^• and nonionic surfactants, C. ₂ av. chain length) 10 , . 00

Lauryl ether sulfate (3 mole EO) 10 , . 00

Sodium tripolyphosphate 2 , .00

Ethyl carbitol solvent 1 . . 50

Tinopal 5BM optical brightener (diamino stilbene) 0. . 05

N-n-dodecyl-2-pyrrolidone 2 , .00

Fragrance Q . . S .

Preservative Q . , s .

H ₂ 0 to 100%

The complexing properties of the pyrrolidone component, as explained in the formulations H-(i) trhough H-(v), enable the shampoo formulation to eliminate pet odors as well as providing superior cleaning and depositing a microfilm of pyrrolidone which acts as a barrier against redeposit of soil.

M. Detergent Rinse Aid % by Wt.

Nonoxynol 9 (9 av. ethoxylated nonyl phenol) 30.00

Isopropanol 15.00

Propylene glycol 15.00

N-n-octyl-2-pyrrolidone 3.00

H ₂ 0 37.00

Addi ion of the pyrrolidone component in the above formulation significantly reduces the rinsing time to more effectively and completely remove soapy deposits; thus preserving color brightness.

N. Fabric Softener % by Wt.

Miranol DM (monocarboxylic stearic Q / derivative, sodium salt) 3.00 Arquad 2HT 75 (dimethylChydrogenated tallow] ammonium chloride) 2.00

N-n-dodecyl-2-pyrrolidone 1.00

Fragrance 0.25 ₅ H ₂ 0 93.75

Formulation N can be added directly to the washing detergent or used to impregnate non-woven strips employed in a clothes dryer or sprayed directly on fabric after laundering.

O. Antistat formulations (wash cycle additive) % by Wt

(i) Sodium silicate (2:1 ratio SiO to Na.O) ^' 10 , . 00 Laurie acid 0 , . 20 Sodium hydroxide 0. . 20 Sodium carbonate 33 , . 25 Sodium sulfate 43 . , 20 (1) Igepal CO-630 7 . , 00

N-n-dodeσyIpyrro1idone 5 . , 00 H ₂ 0 1 . 15

(1) 100% active liquid condensation product of nonyl alcohol and nine units of ethylene oxide

The above formulation significantly lowered the static electricity on clothes dried in an automatic dryer and is compatable with wash cycle detergents.

(ii) Melted polypropylene having a melt flow index of 8 and a density of 0.902 at 200°C. was mixed with 1% by weight of N-dodecyl-2-pyrrolidσne and extruded from a twin screw extruder to form bottles. The same operation was repeated with the melted polypropylene, but omitting the 1% pyrrolidone. Unlike the pyrrolidone deficient composition, those bottles containing pyrrolidone did not pick up dust or lint after 10 passes over a nylon cloth and their surface resistivity was measured at 1x10 12 ohm at 30% humidity, as opposed to 4x10 14 ohm (30% humidity) reported for the pyrrolidone defficient polypropylene bottles.

P. Liquid Sof ening/Antistat Composition % by Wt.

N-n-tetradecylpyrrolidone 5.4

(2) Igepal CO-660 23.9

H ₂ 0 55.7 Ethanol 15.0

(2) 100% active liquid/liquid condensation product of nonyl alcohol and ten units of ethylene oxide

The above formulation exhibited the same properties as Formulation C. Antistatic compositions incorporating from about

5% to about 100% of the present lactams as the active ingredient are also usefully applied as aerosol sprays to rugs, clothing and furniture whereby the anionic charges accumulated on these surfaces are neutralized and discharged by the mildly cationic character of the present lactams below pH 7.

Q. Complexed Compositions % by Wt.

H ₂ 0 60.99

N-n-dodecylpyrrolidone 10.48 Sodium iodide 22.20

Iodine 6.33 The N-n-dodecyl pyrrolidone-iodine complex

(iodophor) which formed provides improved iodine solubility for disinfecting purposes.

R. Acid thickener % by t.

Concentrated HCl 50.0

N-n-dodecylpyrroli one 50.0

The H complexation of the N-n-dodecyl pyrrolidone with the acid significantly increased the acid viscosity so that the formulation can be applied to vertical surfaces without runoff.

S. SKIN LOTION

Ingredient % by wt.

Stearic Acid 3.00

Mineral Oil, 70 cts 2.00 Emulsifying Wax 3.00

Di ethicone 1.50

Deionized Water QS

Carbomer 934 * 0.15

Oleth-20 ** 1.00 N-decyl-2-pyrrolidone 1.00

Triethanolamine, 98% 1.00

Preservative QS

Fragrance QS

T. FACIAL CREAM

Ingredient % by Wt

Mineral Oil, 70 cts 6. 00

Petrolatum 4. 00

Lanolin 3. 00

Glyceryl Monostearate, S.E. Acid Stable 19. 00

Glycerine 1. 00

N-octyl-2-pyrrolidone 2. 00

Deionized Water QS

Preservative QS Fragrance QS

* a crosslinked polymer of acrylic acid (B.F. Goodrich)

** the polyethylene glycol ether of oleyl alcohol (GAF Corp. )

U. SUNSCREEN LOTION

Ingre ient % by Wt, Myristyl Myristrate 1.00 PVP/Eicosene Copolymer 2.00 Glyceryl Stearate, S.E. 3.50 Dimethicone 1.00

N-dodecyl-2-pyrrolidone 2.00 Deionized water Q.S. Carborner 940 0.10 Trie hanolamine 0.10 Preservative (Germaben II) * Q.S. Octyldimethyl p-aminobenzoic acid 4.00 Fragrance Q.S.

V. HAIR SHAMPOO

Ingredient % by Wt,

C, .-C, Alpha Ole in Sulfonate 20.00

Ammonium Lauryl Sulfate 25.00

Cocamidopropyl Betaine 3.50

N-dodecyl-2-pyrrolidone 1.00 Sodium Laureth-4-Phosphate 1.00

Hydrolyzed Animal Protein 0.25

Tetrasodium ethylene diamine tetra acetic acid 0.15

Deionized water Q.S. Fragrance Q.S.

Preservative (Kathon CG) ** Q.S.

* N-Cl,3-bis(hydroxymethyl)-2,5-dioxo-4-imidazolidinyl- N,N'-bis(hydroxymethyl)urea; Sutton Labs.

** 5-chloro-2-methyl-4-isothiazolin-3-one (Rohm & Haas)

W. BODY SHAMPOO

Ingredient % by wt.

Deionized water Q.S.

C. ₄ -C,g Alpha Olefin Sulfonate 35.00 Sodium Methyl Cocyl Taurate 12.00

Polyethylene glycol-150 Distearate 1.00

Glycol Distearate 2.00

N-dodecyl-2-pyrrolidone 6.00 Polyquaternium-11 2.50 Cocamidopropyl Betaine 10.00

Citric Acid to pH 6.0

Fragrance Q.S.

Preservative (Kathon CG ) Q.S.

X. BRUSHLESS SHAVING CREAM Ingredient % by Wt.

A. Stearic Acid 20.00 Cetyl Alcohol 1.00 Lanolin 2.00 Isopropyl Palmitate 6.00 (Part A added molten and mixed with Part B at 80°C.)

B. Hexylene Glycol 8.00 Triethanol Amine 1.80 Potassium Hydroxide 0.50 Borax 2.00 N-tetradecyl-2-pyrrolidone 2.00

Deionized water. Q.S.

Preservative (Kathon CG ) Q.S.

Fragrance Q.S.

Y. AEROSOL SHAVING CREAM

Ingredient % by Wt.

Deionized Water Q.S.

Glycerine 5.8

Oleth-20 1.0

Butylated hydroxy anisole 0.1

Butylated hydroxy toluene 0.1

Stearic Acid 7.5

Lanolin 0.5

Mineral Oil, 70 cts 2.4

Cetyl Alcohol 0.5

Triethanolamine, 98% 3.9

Cocamide Diethanolamine 0.5

N-dodecyl-2-pyrrolidone 2.0 Fragrance 0.5

Concentrate : Propellant Ratio - 95:5 Propellant : A-46 C80:20 - Isobutane/Propane]

The incorporation of the present lactams in any of the cosmetic formulations provides additional moisturizing and softness to the skin and hair as well as superior penetration and promotes creamy smooth emulsions and/or thicker consistency to any of the cream or lotion formulations.

Z. Hand Lotion Parts by Wt,

Water

Propylene glycol 2

Petrolatum 3

Stearic acid 6

Triethanolamine 1

Glycerin 2

N-dodecy1-2-pyrrolidone 5

AA. Waterless Hand Cleaner % by Wt.

Deionized Kerosene 44.00 Stearic acid 4.00

Ethoxylated nonyl phenol 4.00 Propylene glycol 4.00 Arcosolve DPM (dipropylene glycol mono- methyl ether) 3 , . 00 < Triethanolamine 1 . . 00 N-n-octyl-2-pyrrolidone 3 . . 00 Fragrance Q . ,s. Preservative Q . ,s .

H ₂ 0 Up to 100%

The solubilizing effect of the pyrrolidone on grease, oil and. tar deposits, coupled with improved skin penetrating capability, contribute to the superior cleaning power of formulation AA.

BB. Cold Cream Parts by Wt,

Water 58

Propylene glycol monostearate 4

Lanolin 6

Mineral Oil 26

Triethanolamine 1.5

N-nony1-2-pyrroli one. 4.5

CC. Insect Repellant Gel Parti s by Wt Metadelphene 600 Ethanol 100

Carboxymethylene 10 N-tallow-2-pyrroli one 15 Triethanolamine 8

DD. Aerosol Pesticidal Formulation % by Wt . Dowicide 1 (2-phenylphenσl) 5 .00 Glycol ether of Dowanol DPM (Dipropylene glycol onomethyl ether) 10.00 Deionized kerosene 10.00 Aerothene TT solvent

(1,1, 1-trichloroethane) 40.00

Of)

Propellant A-46 ( / 20 vol. mixture of isobutane and propane) 25.00 -N ^" -π-dσdecyl-2-pyrrolidone 10.00

Formulation DD is particularly suited for use against flies, mosquitoes and ticks and may be safely sprayed on animals, humans and inanimate substrates to kill or deter attack by such pests.

EE. Toxicity Reducing Formulation

Ingredient % by Wt.

Aldicarb 7.5

N-alkyl pyrrolidone mixture: C„, C. ₂ and C. _fl alkyl in ratio 5:2.5:2.5 2.0%

Igepon T 77 11.0%

Xylene 3.0%

H ₂ 0 76.5%

The toxicity of Aldicarb, i.e. 2-methyl-2-(methylthio) propanal 0-C methylamino)carbonyl1 oxime, in the above formulation is reduced by at least /. -. over that in which no lactams was employed and the formulation EE provides high mortality to cockroaches, ants and other pests over an extended period of time.

FF. Herbicidal and Fungicidal Adjuvant Formulation

The following formulation has been specially developed for triazine herbicides in post emergent applications in order to increase the application rate without reducing weed control and, at the same time, reducing harmful residues, thus allowing quick crop rotation.

The present N-alkyl lactams can be built into a suspension concentrate without detracting from the physical stability of the product.

A concentrate formulation

Atrazine (2-chloro-4-ethylamino-6-isopropyl- amino,-1, 3, 5-triazine) 250 grams N-n-octyl-2-pyrrolidone 328 grams

H ₂ 0 to 1 liter

GG . Emulsifiable Concentrate Formulations for Agricultural Chemicals

(i) The following formulations (1-5) describe herbicidal 2,4-D (isopropyl ester of 2, 4-dichlorophenoxy acetic acid) emulsifiable concentrates in various solvents which contain a 50/50 wt % mixture of N-dodecyl-2- pyrrolidone and Emulphor EL-620 and which, when added to water, produce stable emulsions.

# herbicide Surfactant Xylene Kerosene Velsicσl* Shell** % by Wt. Blend % by % by AR-50 E-407-R % by Wt. Wt. Wt. % by Wt. % by Wt.

1 39 5 56 - 1 2 44 5 51 -

3 44 5 - 51

4 40 5 - 21

5 47 5 - - - 48

The same formulations can be used for the butyl and other alkyl esters of 2,4-D. The addition of the pyrrolidone mixture in the above formulation controls viscosity, provides a stable emulsion and better distribution of the formulation on the vegetation.

(ii) The following formulations (1-7) describe suitable insecticidal (chlordane) emulsifiable concentrates containing a 10/40 wt. % blend of N-n-octyl—2-pyrrolidone- and Emulphor EL-620 optionally combined with varying amounts of Igepal CO-630. The Igepal containing blends when added to water produce fast breaking emulsions; whereas those omitting Igepal are stable.

# Chlordane* Igepa1 Pyrrol idone/ Butyl Kerosen wt. % CO-630 Emulphor Cellosol e t. % t. % Blend t. % wt. %

1 50 - 35 - -

2 50 - 35 15 -

3 46 2 - - 46

4 46 2.5 - - 49

5 75 - 5 - 20

6 75 10 - - 15

7 46 9 — — 45

* 1, 2,4, 5, 6, 7,8, 8-0ctachloro-2, 3, 3a,4, 7, 7a-hexahydro-4, 7- methanoindane

(iii) The following, formulations (1-4) describe suitable insecticϊdal (toxaphene) emulsifiable concentrates containing a 20/20/40 blend of N-n-decyl-2-pyrrolidone, N-n-dodecyl-2-pyrrolidone and Emulphor EL-620, optionally combined with varying amounts of Igepal CO-530. The Igepal containing blends, when added to water provide fast breaking emulsions; whereas those which omit Igepal provide stable emulsions.

41 ιr Toxaphene* Igepa1 Surfactant Kerosene Butyl wt. % CO-530 Blend t. % Cellosol t. % wt. % t. %

1 50 15 35 - -

2 50 - 35 - 15

3 45 8 - 47 -

4 45 4 - 50 -

* chlorinated camphene

The pyrrolidone in the toxaphene formulation provides the same promotional effect as noted for ^" chlordane.

HH. Herbicidal Wettable Powder Formulations % by Wt.

(i) Isopropylphenyl carbamate 50.00 Hi-Si1 (hydrated amorphorous silica) 46.00 Marasperse N (sodium lignosulfonate) 2.00 N-n-octyl-2-pyrrolidone 2.00

Above formulation has excellent suspension and dispersion in hard and soft water.

(ϋ) % by Wt

Chlordane 40.00

Attaclay (attapulgite) 55.00

Blancol 3.00

N-n-octyl-2-pyrrolidone 2 .00

(iii) % by Wt

Chlordane 40.00

Attaclay 56.50

Marasperse N 2.00

Igepon T 77 0.50

N-n-dodecyl-2-pyrrolidone 1.00

(iv) % by Wt.

Toxaphene 40.00

Attaclay 56.00

Daxad 27 (Na salt of a polymerized

-? 5 substituted benzoid alkyl sulfonic acid) 3.00

„ N-n-octyl-2-pyrrolidone 1.00

(v) % by Wt

Toxaphene 40.00 10 Attaclay 55.00

Blancol 4.00 N-n-octyl-2-pyrrolidone 1.00

(vi) % by W

Toxaphene 40.00 15 Attaclay 55.00

^■ Marasperse N 4.00

N-n-octy1-2-pyrrolidone/N-n-dodecyl-

2-pyrrolidone 75/25 mixture 1.00

(vii) % by Wt.

20 Aldrin ( 1, 2, 3, 4, 10, 10-hexachloro-l, 4, 4a,

5,8,8a-hexahydro-exo-l, 4-endo-5,8- dimethano-naphthalene 25 .00 Attaclay 71. .50 Blanco. 2 .00 25 Igepon T-77 0, .50

N-n-octyl-2-pyrrolidone 1. .00

(viii) % by Wt

Aldrin 50. .00 Attaclay 45. .00 30 Marasperse N 3. .00

N-n-decyl-2-pyrrolidone 2. .00

(ix) % by Wt.

Aldrin 75.00

Hi-Sil 20.00

Blancol 3.00

N-n-dodeσy1-2-pyrro1idone 2.00

(x) % by Wt,

Dieldrin (Hexachloro-epoxy-octahydro- endo, exo-dimethanonaphthalene) 25 . . 00 Attaclay 71 . . 50 Blancol 2 . .00 Igepon T-77 0. . 50 N-n-octyl-2-pyrrolidone 1. .00

(xi) % by Wt

Dieldrin 50. , 00

Attaclay 45. . 00

Blancol 3 . . 00

N- -dodecy1-2—pyrrolidone 2 . . 00

The above formulations are milled on a fly cutter mill at 20,000 rpm for 1 minute at room temperature and provide concentrates having a wetting time less than 30 seconds.

II. Fungicidal Wettable Powder Formulation % by Wt. Phenyl Mercuric Acetate 90.00 N-n-octyl-2-pyrrolidone 1.00

The formulation provides a free flowing, non-bleeding powder; however only 0.1 to about 0.5% by weigh of N-n-octyl-2-pyrrolidone is required to impart good wettability to this fungicidal powder.

JJ . Paint Remover & Paint Brush Cleaner Parts

Benzene 4

Fusel Oil 3

Alcohol 1

N-hexadecyl-2-pyrrolidone 10

KK . Rodent Paste Parts

Lard 1

Flour 1

White Arsenic 2

N-eicosy1-2-pyrrolidone 2

Oil of anise 10 drops

LL. Rust Remover Wt. % GAFTEX PT (methyl vinyl ether/

"maleic anhydride copolymer) 7 Citric Acid 5

Water 63

N-cσcoalkyl-2-pyrrolidone 20

Polyvinyl pyrrolidone K90 5

The lactam mixture forms a coating over the metal, thereby inhibiting subsequent rust formation on the cleaned surface.

MM. Perfume Parts by Wt.

Lilac 80

Muguet 5 3% Musk extract 5

Tuberose absolute 2

Jasmine 8

90% alcohol 800

N-pentadecyl-2-pyrrolidone 100

Retention of the perfume odor on the skin is remarkably extended.

NN. Spray-Wipe Furniture Polish % by Wt.

Petrolite C-36 emulsion*(20%) 3.50

Isopar E solvent (C_-Cg isoparaffin mixture of branched chain aliphatic hydrocarbons) 32.50

S-Maz 80 (Sorbitan onooleate) 0.20

Masil EM 1000 emulsion (dimethyl polysiloxane silicone emulsion, 60% active) 3.40 50/50 mixture of N-n-octyl- and

N-n-dodecyl-2-pyrrolidones 3.00

Fragrance 0.40

H ₂ 0 57.00

^♦ reacted microcrystalline wax, m.p. 195°F, needle penetration at 77°F is 7.5

The use of the present lactams in any of the commercially available furniture and metal polishes promotes cleaning as the lactam exerts its complexability with soil, grease or oily deposits, thus facilitating their removal. Furniture polish formulation NIT also provides superior penetration into the wood surface and diffuses through previous wax deposits.

00. Dry Cleaning Formulations % by Wt.

(i) Perchloroethylene 94.50 Isopropyl methyl cellulose 0.50

N-octyl-2-pyrrolidone 5.00

(ii) Perchloroethylene 46.00

Ethoxylated nonylphenol phosphate ester

(GAFAC RS-610 and PE-510, 2:1) 31.00 N-octyl-2-pyrrolidone 15.00

Potassium hydroxide 8.00

(iii) Stoddard solvent (a petroleum % by Wt distillate between gasoline & kerosene) 41 . . 50 GAFAC RS-610 30 , . 00 Nekal WT-27 (sulfonated aliphatic polyester) 7 , . 50 Hexylene glycol 10 . . 00 Potassium hydroxide 8 . . 00 N-dodecy1-2-pyrrolidone 3 . . 00

(iv) Perchloroethylene 40. , 00

Isopropanol 5 . 00

N-dodecy1-2-pyrrolidone 50. , 00 Water 5. 00

The above formulations are highly effective in -removal of wine, tea, fruit and other water soluble and oil soluble stains together with normal soil. Additionally, the present lactams eliminate any perspiration stains or body odor remaining in a fabric.

The above and many other formulations which require one or more- of the properties imparted by the present pyrrolidone products are suitably employed in the present invention. Also, any of the N-C- to C ₂₂ alkyl-caprolactams can be substituted therein to provide those benefits described for the alkyl pyrrolidones.

^pp - Decontaminating Solution For Removal Of % by Wt. Radioactive Material

Sodium lauryl ether sulfate 10.00

N-dodecy1-2-pyrrolidone 5.00

Cocoamidopropylbetaine 10.00 H ₂ 0 to 100%

Formulation PP is effective in removing contamination from surfaces, eg. radioactive contaminated surfaces encountered in a diagnostic laboratory. Also radioactive iodine, in concentrations as low as parts per billion, can be completely washed off individuals quickly and efficiently with the above formulation. When the pyrrolidone component is omitted, however, the residual iodine remains on the skin.

QQ. Formulation for Industrial Odor Control % by Wt. N-octyl-2-pyrrolidone 2.00

Dodecylbenzene sulfonic acid 5.00

Sodium xylene sulfonate 2.00

Ethoxylated (av.9) nonylphenol 5.00

H ₂ 0 to 100%

^" Formulation QQ was sprayed at a rate of 1 lb./cubic yard over the soil in which odoriferous lauryl mercaptan had been accidentally spilled. After 1 hour, the objectionable odor was completely eliminated.

RR. Odor Removing Rug Shampoo % by Wt. Sodium lauryl sulfate 12.00

N-dodecyl-2-pyrrolid ne ^" 3.00

Sodium xylene sulfonate 2.00

H ₂ 0 to 100%

Formulation RR was applied to a new rug which had been soiled by dog urine and had a strong amine/mercaptan odor. After drying, the odor of treated rug was reduced to the mildest trace. The application can be repeated for complete odor removal. The omission of pyrrolidone in the above formulation had no odor removing effect whatever when applied to another portion of the rug soiled in the same manner.

LIQUID METAL POLISH

Ingredient % by t. 2-heptadecyl-l-carboxymethyl-l-(2-hydroxyethyl )- 2-imidazolinium chloride 10. .00

Xanthan gum 0. .30

Magnesium aluminum silicate 2. .00 Hydrated amphorous silica 12. ,50 N-n-octyl-2-pyrrolidone 5. ,00 Fragrance 0. ,50 Water Q.S.

100.00 The above formulation is particularly useful on oxidized metals, eg. silver, wherin the oxide is complexed with the lactam and easily removed from the metal surface.

TT.

LIQUID BLACK SHOE POLISH

Ingredient % by Wt. Carnauba wax, 82.5 ^β -86.0°C. (melting point) 4, .00 Dimethyl polysiloxane, 200 CPS 3, .00 Nonionic polypropylene glycol 1. .00

(C-18) Fatty acid ester polyglyceryl-4-oleate 0. .70 Carbon black (10% dispersion in C _g _g

Isoparafin) 4. .00 Cg_ _g Isoparafin 20. .00 N-dodecyl-2-pyrrol done 5. .00 Water Q. ,S. Preservative 0. ,S.

100.00 The above shoe polish moisturizes and conditions the leather while providing good shine.

UU.

(HARD STONE) JEWELRY CLEANER

Ingredient % by Wt . Ammonia, 28° baume 10. . 00 Ethoxylated alkyl phenol (Igepal CA-630) 1 . .00 Alkali stable dye Q . S . N-octyl pyrrolidone 3 , . 00 Water, Deionized to 100%

Formulation NN is particularly good for cleaning non-porous stones such as diamonds, rubies, emeralds, sapphires, topaz, zircons, etc. as well as gold, silver and platinum mountings. Greasy and soapy deposits are effectively complexed with the lactam and removed.

The present N-alkyl lactams are also excellent complexing agents as shown in the following Examples.

EXAMPLE XXXIII

In a glass round bottom 100 ml flask equipped with a thermometer and a condenser was ad _; ded 24.34 g (0.1 mole) of N-dodecy1-2-pyrrolidone and 11.1 g (0.1 mole) hydroquinone. The mixture was heated and stirred until a homogeneous liquid phase was obtained. The melt was maintained at about 135 ^β C. for 30 minutes, whereupon it was chilled to about 20°C. The crystalline solid product which formed had a m.p. of 78-82 ^β C. The complex structure was evidenced by IR spectra which showed a shift of the pyrrolidone carbonyl from 1692 CM~ to 1654 CM and 1612 CM . Proton nuclear magnetic resonance (*HNMR) at 25° + 2°C. indicated a 1:1 molar complex.

EXAMPLE XXXIV

Example XXXIII is repeated except that only 12.17 g (0.05 mole) of N-dodecyl-2-pyrrol idone is used and 13.32 g (0.05 mole) of pentachlorophenol is substituted for 11.1 g of hydroquinone and the resulting melt is heated at 120°C. for 30 minutes. A solid crystalline complex of 1:1 molar N-dodecyl-2-pyrrolidone/penta- chlorophenol is formed.

EXAMPLE XXXV

Example XXXIV is repeated except that 7.61 g

(0.05 mole) of vanillin was substituted for 13.32 g of pentachlorophenol. The mixture was heated until homogeneous and was then maintained at 60°C. for 30 minutes. A low melting crystalline complex was formed.

EXAMPLE XXXVI

In an NMR tube, a mixture of 0.1 molar N-dodecyl-2-pyrrolidone and different concentrations of phenol, from 0.1 to 0.3 M, was dissolved in deuterated chloroform and analyzed by 300 "mega hertz 'HNMR at 25 + 2°C. In each case, the phenolic OH shifted to higher frequency in the presence of N-dodecyl-2-pyrrolidone which shows complexation of N-dodecyl-2-pyrrolidone and phenol through intermolecular hydrogen bonding.

EXAMPLE XXXVII

To 200 g of beer is added 50 g of N-n-dodecyl-2- pyrrolidone with stirring until a uniform mixture is obtained and the mixture is cooled to 15-20°C. to provide a clear solution. The solution is then heated to 25°C. whereupon two liquid phases are formed and separated.

The clear beer fraction, which is the lower phase, is recovered and analyzed by the method of J. Jerumanis (Brauwissenschaft Vol. 25, #10, pages 319-321, 1972). Analysis shows that 90% of the phenolic impurities are removed.

EXAMPLE XXXVIII

To 200g. of beer is added 50g. of N-octadecyl-2- pyrrolidone with stirring for 30 minutes at 25°C. The beer is then filtered to remove the N-octadecyl pyrrolidone/polyphenoliσ complex which was formed.

Analysis by the method of the preceding example shows that 85% of the polyphenols are removed.

EXAMPLE XXXIX

A 2x2 inch swatch of white 100% cotton was impregnated with blue black ink in a 0.5 inch circular area. The swatch was then held under hot water while rubbing for 1 minute. A barely noticeable amount of the ink was removed.

The swatch was then placed on a clean counter and 1 drop of 100% N-n-dodecyl-2-pyrrolidone from a medicine dropper was contacted with the ink spot, and allowed to remain for 1 minute; after which the swatch was held under warm water while rubbing for 0.5 minute. The sample was then dried and examined for ink removal. Only the faintest shadow, barely discernable, blue color remained.

The above experiment was repeated except that 100% N-n-octyl-2-pyrrolidone was substituted for N-n-dodecyl-2-ρyrrolidone. Dye removal was even more complete so that magnification was needed to detect color.

The above compounds can be employed individually or in admixture and used as the sole spot removing agent for home or commercial laundering or in a dry cleaning operation. The compounds may also be incorporated into a commercial stain and spot removing formulation to boost stain removing properties.

EXAMPLE XL

A mixture of glycerine containing about 0.2% N-n-dodecyl-2-pyrrolidone was applied morning and evening to the entire finger nail surface and around the nail bed cuticle of subject A. The nails of subject A were in poor condition, i.e. striated and subject to breakage, splitting and peeling. The above treatment was repeated for 10 consecutive days. Two weeks after the treatment was discontinued, the nails were examined. Resistance to breakage was remarkably improved. Splitting and peeling were also noticably reduced. Nail striation was not diminished, however the nails and cuticle appeared less dry and striations less noticeable.

EXAMPLE XLI /

/

To improve the dissolution rate of hydro¬ chlorothiazide tablets, the blend: by Wt. Per tablet

Hydrochlorothiazide 10.0 45.00 mg N-octyl-2-pyrrolidone 0.5 2.25 mg

1:1 mixture of lactose: dicalcium phosphate 88.5 398.25 mg Magnesium stearate 1.0 4.50 mg

was prepared by blending the hydrochlorothiazide with an ethanolic solution of the N-octyl-pyrrolidone and dried in

an oven at 60 ^β C. The dried material was blended with the lactose/dicalcium phosphate diluent for 7 minutes, after which the magnesium stearate lubricant was added and mixed for an additional 3 minutes. The resulting material was then compressed into tablets of 8-10 Kp hardness by using a Stokes B-2 tablet press (Sample B) .

Alternatively, the above procedure was repeated except that the ethanolic pyrrolidone .solution was added to preblended hydrochlorothiazide and diluent (Sample C) . The above procedure was repeated except that the addition of N-octyl pyrrolidone was omitted to provide a control formulation (Sample A).

Finally the above procedure was again repeated, except that the conventional sodium lauryl sulfate surfactant was substituted for the N-octyl-pyrrol done surfactant to provide a standard ag inst which the efficacy of"the present lactam was measured (Sample D .

The dissolution of Hydrochlorothiazide was then measured for Samples A, B, C and D using the USP method and results of these measurements reported in following Table I.

TABLE I

% % % %

Sample after 30 min after 60 min after 90 min after 120 mi A 7.93 20.80 33.46 44.80

B 26.20 67.03 90.48 95.00

C 98.00

D 100.00

The N-octyl pyrrolidone signi icantly enhanced the dissolution rate of the drug from a directly compressible system and proved to be almost as effective as sodium

lauryl sulfate while superior in other properties such as its non-irritatability and non reactivity with acidic drugs and pharmaceutical excipients. It is well known that sodium lauryl sulfate is highly irritating and its alkaline character causes it to react with acidic components which leads to compatibility problems as well as problems with the physical characteristics of the finished products.

The above procedure for preparing Sample B was twice repeated except that 0.1% by weight and 0.5% by weight of N-dodecyl-2-pyrrolidone was substituted for 0.5% by wt of N-octyl-2-pyrrolidone and the balance of the formulation was taken up by the diluent (Samples E and F respectively) .

The dissolution rates were measured, the results of which are reported in following Table II.

TABLE II

% Dissolution of Drug

After After After After

Sample 30 min 60 min 90 min 120 min

E

(0.1% NDP) 9.63 27.24 49.64 67.64

F

(0.5% NDP) 19.92 59.11 87.07 96.20

The procedure for preparing Sample B was repeated 4 times except that 0.5 wt % of N-decyl-2-pyrrolidone (Sample G) ; 0.5 wt % of N-tetradecyl-2-pyrrolidone (Sample H) r 0.5 wt % of N-octadecyl-2-pyrrolidone (Sample I) and 0.5 wt % of N-methyl-2-pyrrolidone (Sample J) were substituted for 0.5 wt% of N-octyl-2- pyrrolidone. The dissolution rates for these pyrrolidones were measured, -the results of which are reported in Table III.

TABLE II I

Sample After 30 min After 60 min After 90 min After 120 min

G 19.26 51.18 78.15 96.09

H 19.15 61.81 87.40 92.52 I 6.60 19.92 34.78 50.63

J 6.49 16.51 26.97 39.19

Control 7.93 20.80 33.46 44.80

The above results indicate that all of the pyrrolidones tested significantly increased the drug dissolution rate over that of the control; however, the results achieved with N-octyl pyrrolidone were outstanding and C, _Q to C.. alkyl pyrrolidones were only slightly less effective. The dissolution rate increasing effect falls off markedly with the C._ alkyl pyrrolidone and is virtually non-existant in the lower molecular weight solvent type pyrrolidones which lack surfactant properties.

EXAMPLE XL I I

To improve the dissolution rate of chlorothiazide tablets, the following blends were made up:

% by Wt. K Chlorothiazide 10.00

N-dodecyl-2-pyrrolidone 0.50

1:1 mixture of lactose:dicalcium phosphate 88.50

Magnesium stearate 1.00

L Chlorothiazide 10.00

N-dodecyl-2-pyrrolidone 0.25 1:1 mixture of lactose:dicalcium phosphate '■ 88.75

Magnesium stearate! 1.00

M Chlorothiazide 10.00

N-dodecyl-2-pyrrolidσne 0.10 1:1 mixture of lactose:dicalcium phosphate 88.90

Magnesium stearate 1.00

N Chlorothiazide 10.00

1:1 mixture of lactose:dicalcium phosphate 99.00

Magnesium stearate 1.00

Blends K-M were prepared by mixing the chlorothiazide with an ethanolic solution of N-dodecyl-2- pyrrolidone and dried in an oven at 60°C. The dried material was blended with the lactose/dicalcium phosphate diluent for 7 minutes, after which the magnesium stearate was added and mixed for an additional 3 minutes. The

resulting blends were then conpressed into tablets of 8-10 Kp hardness and the dissolution of chlorothiazide was measured for each of K, L and M as reported in Table IV.

The blend of Sample N was similarly prepared except that N-dodecyl-2-pyrrolidone was omitted. This sample served as a control.

TABLE IV

After After After

Sample 60 min. 120 min. 180 min

K 49.14 90.24 99.26 L 58.06 96.33 103.29 M 13.48 23.81 56.54 N 16.63 24.79 31.09

The above data indicates the excellent dissolution properties of N-dodecy1-2-pyrrolidone when employed in the above blends at a concentration of at least 0.25% by weight. Even at the 0.1 wt % concentration level, some improvement was noted after 3 hours.

EXAMPLE XLIII

DEMONSTRATION OF SLIP AND ANTIBLOCK PROPERTIES

1,000 ppm of N-dodecyl-2-pyrrolidone was mixed into molten polypropylene having a melt flow index 8 and a density of 0.902 at 200°C. The resulting melt was conducted through an in-line mixer to an extruder from which a 1 mil blown film was deposited on a clean stainless steel surface. The above procedure was repeated, except that the pyrrolidone was omitted. The coefficients of friction for the films

were measured and the pyrrolidone containing film indicated a significant reduction compared to the untreated film. This reduction or "slip" development reaches a mixi um within 24 hours, indicating rapid blooming of the pyrrolidone to the film surface. The following Table V summarized the data.

TABLE V

Coefficient of Friction: Cast Polypropylene Film

Film containing

Film containing Kemamide E

Elapsed Time Untreated N-C. ₂ -pyrrolidone (Erucamide)

Hours Polypropylene (1,000 ppm) (1,000 ppm)

1 ^• -. 1.2 0.50 0.73

3 ^■ ' ' 1..2 ^■ ' , 0.38 0.65 ^' 6 1.2 0.25 0.6l ^'

24 1.2 0.21 0.48

48 1.2 0.21 0.44

The data indicates the superior utility of the N-dodecyl pyrrolidone in the above melt.

EXAMPLE XLIV

Demonstration of Dye Enhancing Properties

A low density polyethylene having a melt index 8 at 200°C. was mixed with 0.5% by weight N-docecyl-2- pyrrolidone. The resulting uniform mixture was transferred to an extruder from which clothes-hangers were produced.

The procedure was repeated except that mixture with a pyrrolidone was omitted. Unlike the untreated polymer, the N-docecyl-2-pyrrolidone containing thermoplastic absorbed 0.1% cationic dye having an anionic charge, (CI Acid Yellow 49), from boiling water upon immersion for one hour.

No absorption occurred with the pyrrolidone defficient melt. Other suitable acid anionic dyes which are beneficially absorbed by the lactams of this invention include CI Acid Blue 40, Cl Acid Red 337, Cl Acid Yellow 159, Cl Acid Yellow 79 and CI Acid Yellow 151.

The following examples illustrates a low-energy process for removing organic pollutants from aqueous streams in waste water treatment. The waste waters included within the scope of this invention are sewage, wastes from industrial processes, such as for example a pul paper mill, chemicals manufacture, plastic manufacturing, dairy and food processing; industrial spills of fuel -oil and other contaminating chemicals and power plant waste-waters. Of particular interest are the phenolic, halogen, mercapto, sulfur dioxide, nitric oxide and urea type contaminants contained in such waste waters.

Phenolic compounds are specially troublesome because, not only are they widely used in a great number of applications ranging from agricultural chemicals to food additives but also because they are unavoidably formed in many industrial processes. Phenolics are known to impart a disagreeable taste and odor to drinking water and edible aquatic life forms and are believed to be harmful against man and/or the environment. However, current methods for phenolic decontamination are time-consuming and laborious. The present low energy process provides an efficient method for removing these contaminants.

EXAMPLE XLV

Aqueous 100 ml solutions of the following phenolics were prepared in 1 liter glass flasks. TO these aqueous solutions was added N-octyl-2-pyrrolidone in the amounts indicated in Table VI. After the addition, the contents of the flasks were allowed to stand for 15 to 30 minutes, whereupon two liquid layers separated, i.e. an upper organic layer containing phenolics and N-octyl-2-pyrrolidone and a lower water layer. The layers were separated and weighed for phenolic content which was determined by UV absorption.

TABLE VI

Sample Grams of % N-Cg P Grams of % Phenolic in Phenolic added to Phenolic in Separated in Water soln. Separated Lactam Soln. Lactam Soln.

0.02 g. 2 0.02 90 Phenol

0.02 g. 2 0.02 > 90 2,4-di- methyl Phenol

0.03 g. 2 0.03 / ^' >90 Penta- / σhloro Phenol

EXAMPLE XLVI

A 50 ml. deionized water sample containing an organophosphorous salt, namely a 1:1 ratio of dialkyl phosphate and tetraphenyl arsenic chloride salt was contacted with 4 ml. of N-octyl-2-pyrrolidone. After completion of the addition, the resulting mixture was allowed to stand for 15 minutes at room temperature; whereupon 2 layers separated: a lower water layer and an upper pyrrolidone layer. Analysis showed that the separated pyrrolidone layer contained more than 80% of the organophosphorous salt compound.

EXAMPLE XLVII

The procedure described in Example XLVI was repeated except that Bacteriophage virus was substituted for the organophosphorous salt. The separated upper

N-octyl-2-pyrrolidone layer contained more than 70% of the virus.

EXAMPLE XLVIII

The procedure described in Example XLVI was repeated except that Escherichia coli was substituted for the organophosphorous salt and N-dodecyl-2-pyrrolidone was substituted for N-octyl-2-pyrrolidone. The separated upper N-dodecyl-2-pyrrolidone layer contained the Escherichia coli and none was found in the lower water layer.

It is to be understood that the foregoing examples are merely representative and serve to illustrate the diverse properties discovered for the present lactams. Because of the multifarious effects of the present lactams, many more applications, modifications and alterations than specifically disclosed in the foregoing specification will become apparent to those skilled in the art. These are also within the scope of this invention. Particularly included are substitutions of any of the lactams disclosed herein in any of the above formulations and examples and any particular applications which derive from the unique properties of the present group of lactams including their complexability, surfactant properties, viscosity building, foam stabilizing, and surface tension reducing properties.