| That which is claimed is: 1. A curable composition for use in the binding of fiberglass comprising an aldehyde or ketone and an amino-amide which is the addition product of an amine and a reactant. 2. The curable composition of claim 1 , wherein the composition comprises a thickener and/or rheology modifier. 3. The curable composition of claim 2, wherein the thickener is based on polysaccharides, preferably xanthan gum, guar gum, modified starches, neutralized polyacrylic acids, cellulose derivatives, polyacrylamides and/or polyvinylalcohols. 4. The curable composition of claim 2, wherein the thickener has a weight average molecular weight of at least about 100,000 and most typically below about 2,000,000, most preferably of at least about 200,000 and most typically below about 1 ,000,000.. 5. The curable composition of claim 2, wherein the thickener is based on hydroxyalkly cellulose, preferably hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, or carboxyalkyl cellulose, preferably carboxymethyl cellulose. 6. The curable composition of claim 2, wherein the thickener is present in the curable composition from 0.01 to 3 weight percent (based on dry mass), preferably from 0.05 to 0.1 weight percent (based on dry mass). 7. The curable composition of claim 1 , wherein the composition comprises carbon black. 8. The curable composition of claim 1 , wherein the carbon black is present in the curable compositions from 10 to 50 weight percent (based on dry mass), preferably from 20 to 40 weight percent (based on dry mass). 9. The curable composition of claim 7, wherein the carbon black has particle size of 70nm or less, preferably from 5nm to 70nm, most preferably from 10nm to 30nm. 10. The curable composition of claim 1 , wherein the amine is a diamine having at least one primary amine group, and the reactant is selected from the group consisting of saturated or unsaturated anhydrides, carboxylic acids, esters, and salts and mixtures thereof. 11. The curable composition of claim 1 , wherein said amine is selected from the group consisting of 1 ,2-diethylamine, 1 ,3-propanediamine, 1 ,4-butanediamine, 1 ,5- pentanediamine, 1 ,6-hexanediamine, α ,α '-diaminoxylene, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and mixtures thereof. 12. The curable composition of claim 1 , wherein said reactant is selected from the group consisting of maleic acid, fumaric acid, itaconic acid, itaconic anhydride, maleic anhydride, mono- and di-esters of maleic acid, mono- and di-esters of fumaric acid, and salts and mixtures thereof. 13. The curable composition of claim 1 , wherein said reactant is maleic anhydride. 14. The curable composition of claim 1 , wherein an aldehyde is used with the amino- amide. 15. The curable composition of claim 14, wherein the aldehyde is a reducing sugar, preferably a reducing monosaccharide, in particular glucose. 16. The curable composition of claim 1 , wherein the amino-amide is an oligomer. 17. A process for binding fiberglass comprising applying to fiberglass the composition of claim 1 and thereafter curing said composition while present on said fiberglass. 18. A formaldehyde-free fiberglass product formed by the process of claim 17. 19. The fiberglass product according to claim 18, wherein the product is a facer material. |
Fiberglass binders used in the present sense should not be confused with matrix resins which are an entirely different and non-analogous field of art While sometimes termed "binders", matrix resins act to hi! the entire interstitial space between fibers, resulting in a dense, fiber reinforced product where the matrix must translate the fiber strength properties to the composite, whereas "binder resins" as used herein are not fully space-fiihng, but rather coat only the fibers, and particularly the junctions of fibers Fiberglass binders also cannot be equated with paper or wood product "binders" where the adhesive properties are tailored to the chemical nature of the celiuiosic substrates Many such resins are not suitable for use as fiberglass binders One skilled in the art of fiberglass binders would not look to celiuiosic binders to solve any of the known problems associated with fiberglass binders
Binders useful in fiberglass products generally require a low viscosity in the uncured state, yet possess characteristics so as to form a rigid thermoset poiymeric binder for the glass fibers when cured A low binder viscosity in the uncured state is required to allow the mat to be sized correctly Also, viscous binders commonly tend to be tacky or sticky and hence they lead to the accumulation of fiber on the forming chamber walls This accumulated fiber may later fall onto the mat causing dense areas and product problems From among the many thermosetting polymers, numerous candidates for suitable thermosetting fiberglass binder resins exist. However, binder-coated fiberglass products are often of the commodity type, and thus cost becomes a driving factor, generally ruling out resins such as thermosetting poiyurethanes, epoxies, and others. Due to their excellent cost/performance ratio, the resins of choice in the past have been phenol- formaldehyde resins. Phenol-formaldehyde resins can be economically produced, and can be extended with urea prior to use as a binder in many applications. Such urea- extended phenol-formaldehyde binders have been the mainstay of the fiberglass industry for years, for example.
Over the past several decades however, minimization of volatile organic compound emissions (VOCs) and hazardous air pollutants (HAPS) both on the part of the industry desiring to provide a cleaner environment, as well as by Federal regulation, has led to extensive investigations into not only reducing emissions from the current formaldehyde-based binders, but also into candidate replacement binders. For example, subtle changes in the ratios of phenol to formaldehyde in the preparation of the basic phenol-formaldehyde resole resins, changes in catalysts, and addition of different and multiple formaldehyde scavengers, has resulted in considerable improvement in emissions from phenol-formaldehyde binders as compared with the binders previously used. However, with increasingly stringent Federal regulations, more and more attention has been paid to alternative binder systems which are free from formaldehyde.
One such candidate binder system employs polymers of acrylic acid as a first component, and a polyol such as triethanolamine, glycerine, or a modestly oxyalkylated glycerine as a curing or "crosslinking" component. The preparation and properties of such ρoly(acryiic acid)-based binders, including information relative to the VOC emissions, and a comparison of binder properties versus urea-formaldehyde binders is presented in "Formaldehyde-Free Crossϋnking Binders For Non-Wovens," Charles T, Arkins et a!., TAPPI journal, Vol. 78, No. 1 1 , pages 181-168, November 1995. The binders disclosed by the Arkins article, appear to be B-stageabie as well as being able to provide physical properties similar to those of urea/formaldehyde resins.
U.S. Patent No. 5,340,868 discloses fiberglass insulation products cured with a combination of a poiycarboxy polymer, a-hydroxyaikylamide, and at least one trifunctional monomeric carboxylic acid such as citric acid. The specific poiycarboxy polymers disclosed are poly(acry!ιc acid) polymers See also U S Paten* No 5 143,582
U S Patent No 5,318 990 discloses a fibrous glass binder which comprises a polycarboxy polymer, a monomeric trihydric alcohol and a catalyst comprising an alkali metal salt of a phosphorous-containing organic acid
U S Publication No 2007/0142596 discloses binders comprised of a mixture of Maillard reactants The reactants comprise a monosaccharide and an ammonium salt of a polycarboxylic acid
Published European Patent Application EP 0 583 086 A1 appears to provide details of poiyacryhc acid binders whoso euro is catalyzed by a phosphorus-containing catalyst system as discussed in the Arkms article previously cited Higher molecular weight po!y(acryiιc acids) are stated to provide polymers exhibiting more complete cure See also U S Patent Nos 5,661 213, 5,427 587, 6,136 916, and 6,221 ,973
Some polycarboxylic polymers have been found useful for making fiberglass insulation products Problems of dumping or sticking of the glass fibers to the inside of the forming chambers during the processing, as weli as providing a final product that exhibits the recovery and rigidity necessary to provide a commercially acceptable hberglass insulation product, have been overcome See for example, U S Patent No 6,331 ,350 The thermosetting acrylic resins have been found to be more hydrophihc than the traditional phenolic binders however This hydrophilicity can result in fiberglass insulation that is more prone to absorb liquid water, thereby possibly compromising the integrity of the product Also, the thermosetting acrylsc resins now being used as binding agents for fiberglass have been found to not react as effectively with silane coupling agents of the type traditionally used by the industry increasing product cost The addition of silicone as a hydrophobing agent results in problems when abatement devices are used that are based on incineration as well as additional cost Also the presence of silicone in the manufacturing process can interfere with the adhesion of certain facing substrates to the finished fiberglass material Overcoming these problems will help to better utilize poiycarboxyiic polymers in fiberglass binders SUIVIiViARY OF THE !NVENTSON
A curable composition for use in the binding of fiberglass is provided comprising an addition product of an amine and a saturated or unsaturated reactant in the form of an ammo-amide intermediate To this intermediate is added an aldehyde or ketone, preferably a reducing sugar, to form a curable binder composition This composition upon curing is capable of forming a water-insoluble polymer composition which exhibits good adhesion to glass A process for binding fiberglass is provided comprising applying to fiberglass a coating of a composition comprising an addition product of an amine and a saturated or unsaturated reactant in the form of an amino-amide intermediate, to which is added an aldehyde or ketone Thereafter the composition ss cured while present as a coating on the fiberglass to form a water-insoluble polymer composition which exhibits good adhesion to the fiberglass
In one embodiment, the ammo-amide intermediate is first heated to create an oligomer The aldehyde or ketone is added to the oligomer This composition is added to the fiberglass as a binder and cured in a preferred embodiment the resulting fiberglass product is a fiberglass mat as facer In other embodiments the fiberglass product is a microglass-based substrate useful when forming a printed circuit board, battery separator, filter stock, or reinforcement scrim
Accordingly, in one aspect the present invention provides a novel, non-phenol- formaldehyde binder
Another aspect of the invention provides a novel fiberglass binder which provides advantageous flow properties, the possibility of lower binder usage, the possibility of overall lower energy consumption, elimination of interference in the process by a silicone, and improved overall economics
Still another aspect of the present invention is to provide a binder for fiberglass having improved economics, while also enjoying improved physical properties In addition, the present invention increases the sustainable portion of the binder and reduces the dependency on a fossil based source for the ressn
These and other aspects of the present invention will become apparent to the sksϋed artisan upon a review of the following description and the claims appended hereto
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS The novei fiberglass binder composition of the present invention is a curable composition comprising the reaction product of an amine and a saturated or unsaturated reactant to form an amino-amide intermediate in accordance with one embodiment of the invention, amine reactants are selected which are capable of undergoing conjugate addition to form the requisite ammo- amide which forms a water-insoluble polyimide upon curing in such an embodiment the amine is a dι- or multi-functional primary or secondary amine More preferably, the amine is a diamine having at least one primary amine group Preferred examples of amines include but are not limited to, aliphatic, cycloaiiphatic and aromatic amines The amines may be linear or branched The amine functionalities may be dι- or multifunctional primary or secondary amines The amines can include other functionalities and linkages such as alcohols, thiols, esters, amides, acids, ethers and others
Preferred amines that are suitable for use in such an embodiment include 1 ,2- diethylarmne, 1 ,3-propanedιamιne 1 4-butanedsamine, 1 ,5-pentanedιamιne, 1 ,6- hexanediamine alpha . alpha '-diaminoxylene. diethylenetπamine, triethylenetetramine, tetraethylenepentamine, and mixtures of these A preferred diamines for use in this embodiment of the invention are 1 ,4-butanedιamιne and 1 6-hexanedιamine Natural and synthetic amino acids such as lysine, anginine hestidine, etc can aiso be used
The curable amino-armde is formed through the selection of an unsaturated or saturated reactant that is an anhydride, carboxyiic acid, ester and salts and mixtures of such reactants Preferred unsaturated reactants are maieic acid, fumaric acid, maleic anhydride mono- and dι-esters of maieic and and fumaπc acid, and salts and mixtures of these Ammonium salts of the unsaturated acids of their monoesters conveniently can be utilized A preferred unsaturated reactant is maieic anhydride Preferred saturated reactants include, but are not limited to, succinic anhydride, succinic acid, mono and diesters of succinic acid, glutaric acsd and anhydride, phthaiic acid and anhydride, tetrahydro phthaic acid and anhydride mono and diesters of acid anhydrides and salts of the acids, and their mono esters A preferred saturated reactant is phthaiic anhydride or tetrahydro phthaiic anhydride The arruno-amide addition products can be readily formed by mixing the components in an aqueous medium at room temperature The resulting addition products are either water-soluble, water-dispersibie, or are present as an emulsion To the solution of amino-amide the carbony! functional materials can be added, especially an aldehyde or ketone Due to their higher reactivity, aldehydes are preferred to ketones The composition comprises the ammo-amide and the aldehyde and/or ketone Some reaction does take place within the composition between the components However the reaction is completed during the curing step, foliowed by the cross-linking reaction of curing
Preferred examples of suitable aldehydes include, but are not limited to, mono- and multifunctional aldehydes including acetaldehyde, hydincy acetaldehyde
butyraldehyde, acrolein, furfural, glyoxal giyceraldehyde, glutaraldehyde, poiyfurfurai, polyacrolem, copolymers of acrolein and others Reducing mono, dι- and
polysaccharides such as glucose, celobrose maltose, etc can be used, with reducing monosaccharides such as glucose being preferred in particular non-cyclic
monosaccharides containing a ketone and/or aldehyde functional group and hydroxy! groups on most or all of the non-carbonyi carbon atoms are preferred Most preferred monosaccharides are Tπose (3 carbon atoms) Tetrose (4 carbon atoms), Pentose (5 carbon atoms), Hexose (6 carbon atoms) and Heptose (7 carbon atoms), in particular glucose (dextrose), fructose (levuiose), galactose, xylose and ribose The term monosaccharide includes also the Aldose or Ketose of the aforementioned
monosaccharides A molar ratio of salt to carbonyi (saccharide) can vary, but is generally in the range of from 1 50 to 50 1 A ratio of 1 20 to 20 1 is more preferred, with a ratio of 1 10 to 10 1 being most preferred Preferred examples of ketones include but are not limited to, acetone acetyl acetone, 1 ,3-dιhydroxy acetone, benzyl benzoin fructose, etc
The aldehydes and ketones react with the ammo-amide intermediate, which contains an amic acid function, i e , an amide linkage in the vicinity of a carboxyiic acid An arnic acid function is more reactive than a simple carboxyhc acid The amount of aldehyde and/or ketone added is generally such that the molar ratio of carboxyiic acid in the ammo-amide to carbonyl or ketone is from 1 5 to 50 1 A ratio of 1 20 to 20 1 is more preferred, with a ratio of 1 10 to 10 1 being most preferred
One advantage is that the presence of all functional groups, i e , amine, amide and carboxyiic acid, on the same molecule eliminates the potential need for the addition of external crosslinkers or binders such as poiycarboxyhc acids and/or polyvinyl alcohol Such crosslinkers can be added, however if desired
In an embodiment the ammo-amide can be first oiigomenzed prior to adding the aldehyde or ketone The ammo-amide can be heated until an oligomer is obtained, e g , a dimer, trimer or tetramer of the ammo-amide intermediate An example of suitable conditions for making the oligomer involves heating in the range of from 120-150 0 C for up to 5 hours
Using the oiigomenzed product has been found to result in a more robust binder product upon curing This manifests itself in the strength of the binder, and allows for better storage results, higher tensile strength and rigidity, and better recovery for products made with the binder
The composition when applied to the fiberglass optionally can include adhesion prompters, oxygen scavengers, solvents, emulsifiers, pigments, fillers anti-migration aids, coaiescent aids, wetting agents biocides, plastiCizers, organosiianes anti-foaming agents colorants waxes, suspending agents, antioxidants crosshnking catalysts, secondary crosslinkers, and combinations of these
It has been found that in particular curable compositions comprising a thickener and/or rheology modifier provide improved properties, such as improved dry tensile strength and hot/wet tensile strength, of fiberglass mats, as can be seen from Figure 1 and Figure 2.
Exampies below shows an improvement in dry teπsiie strength and hot-wet tensile strength of a non-woven glass mat when a thickener is added to the binder. The binder used is a solution of Hexamethylene diamine, maleic anhydride and glucose. The
thickener used is a type of hydroxy! ceiiuiose thickener, Natrosol 250H4BR from
Hercules
Tβnsiie
htøXWCUuCOSS - iβW. 1<S 72\ tθ! HMOAftf ASGtVbKeM 7% ■ HM[WS-WGSlJOOSa 1 S 7% NEC LOi
Fig 1. Dry tensiie strength of non-woven glass mat bonded with HMDA/MA/Giucose binder. Tensile strength improves when thickener is added to the binder.
The following test method was applied- individual 1 "x6" test specimens were cut from fiberglass mats with the LOi of 19% using a paper cutter along both machine direction (MD) and cross-machine direction (CMD) For dry tensiie, 12 MD specimens and 12 CMD specimens were tested on the lnstron 4466 Test machine with the 100 Ib load cell and a crosshead speed of 1 in/min. For hot/wet tensile, 12 MD specimens were immersed in 180 c 'F water for ten (10) minutes, allowing them to dry for three (3) minutes before testing on lnstron Test machine.
W£W«M/<3tuces« • VM LOi :HM0A*tA,'ffi«Xϊ-;i3 ■ 22% IOI mW.>MΑ!βiwas&W.7V, HEC .
«% i.oi
Fig 2. Hot/wet tensile strength of non-woven glass mat bonded with HNDA/MA/Gtucose binder. Tensile strength improves when thickener is added to the binder.
The thickener and/or rheology modifier can be polymeric-type materials which are at least partially water soluble or inorganic-type materials that are dispersed in water and which increase the viscosity without substantially modifying the other resin properties. Suitable polymeric thickeners are polysaccharides such as xanthan gum, guar gum, modified starches, neutralized poiyacryiic acids, such as sodium poiyacrylate, cellulose derivatives, polyacrylamides and polyvinylalcohols. Preferably such thickener and/or rheology modifier have a weight average molecular weight of at least about 100,000 and most typically below about 2,000,000, most preferably of at least about 200,000 and most typically below about 1 ,000,000. Inorganic thickeners include smectite clay and/or bentonite.
Preferred thickeners are based on hydroxyalkyl cellulose, such as hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, or carboxyalkyl cellulose, such as carboxymethyl cellulose. The amount of thickener and/or rheoiogy modifier being present in the curable composition is preferably from 0 01 to 3 weight pescent (based on dry mass) most preferably from 0 05 to 0 1 weight pei cent φased on dry mass) in addition it has been found that in particular curable compositions comprising a
10 to 50 weight percent (based on dry mass) most preferably fiom 20 to 40 weight percent (based on dry mass) of a carbon black dispoision offers excellent blacking performance The water based carbon black dispersion compi ises typically watei , 40 to b0 weight percent carbon black 0 1 to 5 weight percent preferably 0 1 - 2 weight percent cationic or non-iomc emulsifieis The water based cai bon black dispersion typically may further comprise other additives such as silanes de-foamer and wetting agents for glass fibers Instead of using a water based carbon black dispoisson being added to the cuiabio compositions, it is also possible to add the carbon black directly to the curable compositions This however is less preferred for handling seasons The aforementioned curable compositions comprising carbon black provide sufficient blackness when used in so called faces materials which are fibrous materials predominately based on glass fibers
The carbon black preferably has particle size of /Qnm or less, most preferred from 5nm to 70nm, in particular from 10nm to 30nm Such carbon black materials aie available for example from Brockhuis GmbH & Co KG (Rockwood Pigments NA Inc)
The fiberglass that has the composition according to the pi esent invention applied to it may take a variety of forms and in a preferred embodiment is Fibesgiass mat, preferably facer mats Use in roofing membranes is also pieferable as good tensile and elongation is observed in other embodiments the fiberglass is a rrucragiass-based substrate useful in applications such as printed circuit boards, battery separators filter stock and reinforcement scrim The composition of the piesent invention can be applied to the fiberglass by a variety of techniques like spraying spin-curtain coating and dipping-roil coating In a most piefeπ ed embodiment the inventive binder composition is applied to the non-woven using state of the art standard binder application methods as it is widely used in the industry Water or other solvents can be removed by heating Thereafter the composition undergoes curing wherein a polymeric coating is formed which exhibits good adhesion to glass The poiymeric composition obtained upon curing is a combination of a poiyamino-amide and a poiyamino-imide The poiyimide is the pπmary product, but some of the amide in the intermediate is believed to not form the imide Thus, some polyamino-amide is also present in the cured composition/binder
Such curing can be conducted by heating Elevated curing temperatures on the order of 100 to 300 1 C generally are acceptable Satisfactory curing results are achieved by using standard heating and drying processes as it is commonly used for the glass fiber mat production Temperatures of around 2GG°C in an air oven at line speed are typically sufficient
The amount of cured binder at the conclusion of the curing step commonly is approximately 10 to 30 percent by weight, and most preferably 12 to 20 percent by weight of the total weight of the mat
The inventive binder composition can be applied to all kind of different fibrous substrates The fibrous substrate can be a woven or non-woven materia! and can comprise filaments, chopped fibers, staples fibers or mixtures thereof Polymer fibers and glass fibers are preferred, however all kind of fiber materials which are compatible with the inventive binder composition can be used
The inventive composition is particularly advantageous for glass fiber nonwoven used as facer The intensive black color allows a large variety of different applications The inventive composition is particularly suitable for facer mats with a total weight between 20 to 200 g / sqm, having a preferred weight range between 40 to 100 g / sqm total mat weight
The facer mats used in the present invention typically comprises at least one non- woven web bonded together with the inventive binder The web comprises chopped continuous glass fibers, of which preferably at least about 90 percent, more preferably at least about 95 percent, and most preferably least about 97 percent have a fiber diameter within the range of 1 to 30μm, most preferred withsn the range of 7μ to 13μ For some applications it is preferred to have a very narrow range of about 1 1 i 1 5 μm as described it WO2005/0051 18 which disclosure is hereby entirely incorporated by reference Furthei , it is also possible that the web has several layers of chopped glass libers pioferabiy an outer layer of glass fibers having a diameter from 1 to 10μm and an innoi layer of glass fibers having a diameter fiom 12 to 30μm In such case the innei layei provides mechanical strength and the outer layer is aesthetically pleading More details about such facei materials can be found in EP-A-1 800,853 which disclosure is hereby entiiely incorporated by reference
In addition it is also possible that the web comprises of a blend of chopped glass fibers preferably a major portion of chopped glass fibers have a diameter from 8 to 1 /μm while the minor poi tion of the chopped glass fibei s have a diameter of less than about 5 bμm The minor portion is typically present in about 1 to 30 weight percent of the dry weight of the wob More details about such facor materials can be found in WO-A- 2005/0051 17 which disclosur e is hereby entirely incorporated by reference Although mixtures of different lengths of chopped strand fibers are contemplated and included within the bcope of the invention it is most preferred that a majority of the fibers have lengths of about 0 20 inches to 1 5 inches, more prefesred from about 0 25 inches to 0 6 inches Chopped strand fibers are readily distinguishable from staple fibers by those skilled in the art Staple fibers are usually made by processes such as rotary fibenzation Oi flame attenuation of molten glass known in the fiber industry Thoy typically have a wider range of lengths and fibei diameters than chopped strand fibers By way or contrast it would have been anticipated that the smoothest mats would be obtained with a preponderance of fine fibei s
A preferred continuous glass fiber for fibrous web is at least one member selected from the group consisting of E C T and S type and sodium borosihcate glasses, and mixtuies thereof As is known in the glass art, C glass typically has a soda-limo- borosilicate composition that provides it with enhanced chemical stability in corrosive environments and T gla^s usually has a magnesium aiuminosiiicate composition and especially high tensile stiength in filament form E glass which is also known as electncal glass typically has a caiαum aluminoborosilicate composition and a maximum alkali content of 2 0% E glass fiber is commonly used to reinforce various as tides The web is preferably composed of C glass or E glass If required by the later application, the inventive binder used for the present web may comprise an effective amount of a water repellant, for example vinyl acrylate latex copolymers or stearylated meiamme in typical amounts of about 3 to 10 wt % The web may contain further fillers, pigments, or other inert or active ingredients either throughout the mat or concentrated on a surface For example, the mat can contain effective amounts of fine particles of limestone, glass, clay, coloring pigments, biocide, fungicide, intumescent material, or mixtures thereof Such additives may be added for known structural, functional, or aesthetic qualities imparted thereby These qualities include additional coloration, modification of the structure or texture of the surface, resistance to mold or fungus formation, and fire resistance Preferably flame retardants sufficient to provide flame resistance, e g according to NFPA Method 701 of the National Fire Protection Association or ASTM Standard E84, Class 1 , by the American Society for the Testing of Materials, are added Biocide is preferably added to the mat to resist fungal growth, its effectiveness being measurable in accordance with ASTM Standard D3273
Beside the chopped glass fibers, the web may contain a minor portion of other fibers, either in addition to or in replacement of glass fibers such as mineral fibers, such as mineral wool, slag wool, ceramic fibers, carbon fibers metal fibers, refractory fibers, or mixtures thereof Other synthetic or polymer fibers, such as melt blown micro denier fibers or melt spun fibers of polyester, nylon polyethylene, polypropylene, or the like, may also be used
The non-woven web used in the facer mat has preferably a total weight ranging from ab boouutt 2200 tto 200 g/rrr, more preferred from 25 to 150g/m 2 , and most preferred from 30 to 100 g/m ?
The present invention provides a formaldehyde-free route to form a securely bound formaldehyde-free fiberglass product The binder composition of the present invention provides advantageous flow properties, the elimination of required pH modifiers such as sulfuric acid and caustic and improved overall economics and safety The binder also has the advantages of being stronger and offering lower amounts of relative volatile organic content during curing, which ensures a safer work place and environment The cure time of the binder is also seen to be much faster and therefore does favor the economics while reducing the energy consumption during the curing process and loweπng the carbon footprint. The binder also contains a high level of sustainable raw materials further reducing the dependency on fossil based sources for the ressn. Also, due to the hydrophobic nature of the binder, the need for water repeϋant such as silicones is eliminated or greatly reduced.
The following examples are presented to provide specific examples of the present invention It should be understood, however, that the invention is not limited to the specific details set forth in the Examples.
Example 1
A binder composition was prepared using the following constituents-
Example 2- A binder composition was prepared with the following components:
Binder G4.b comprises the following components: 30.1 % Water soft, 6.2% HMDA (70%) (1 ,6-Dιamιnohexane), 3.7% Maleic anhydride, 57.0% Dextrose (71 % liquid), 2.4%
Ammonium sulfate 0 4% Skane M8 ® (Rohm&Hass), 0 2% Copper sulfate pentahydrate, percentages based on total weight of binder G4.5 Lutensof 5 M7 (BASF) is a non-ionogenic tenside Carbofιn r L2951 (Rockwood Pigment NA inc) is a carbon biack emulsion Siiquest^ A1 100 is an ammo-silano
The composition was applied to a δQg'm 2 glass fiber nonwoven The binder content was 16% based on the total mat weight