TECHNICAL FIEL

The present invention relates to improved cosmetic cleansing compositions, and in particular to foaming cosmetic compositions suitable for cleansing the skin and/or the hair and which may be useα, for example, in the form of make-up removal and facial cleansers, bath foams, shower products, shampoos and the like.

BACKGROUND OF THE INVENTION Foaming cosmetic compositions must satisfy a number of criteria including cleansing power, foaming properties and mildness/low ιrπ- tancy with respect to the skin, hair and the occular mucosae. Skin is made up of several layers of cells which coat and protect the keratin and collagen fibrous proteins that form the skeleton of its structure. The outermost of these layers, referred to as the stratum corneum, is known to be composed of 250 A diameter protein bundles surrounded by 80 A thick bilayers of epidermal lipids and water. Anionic surfactants can penetrate the stratum corneum membrane and, by delipidization (i.e. removal of the lipids from the stratum corneum), destroy its integrity. This destruction of the stratum corneum bilayers can lead to dry rough skin and may eventually permit the surfactant to interact with the viable epidermis, creating irri- tation.

Ideal cosmetic cleansers should cleanse the skin or hair gently, causing little or no irritation without defatting and or drying the skin and without leaving skin taut after frequent use. Most lathering soaps, liquids and bars fail in this respect. Certain synthetic surfactants are known to be mild. However, a major drawback of most mild synthetic surfactant systems, wnen formu¬ lated for skin cleansing, is poor lather performance compared to tne highest bar soap standards (bars which are rich in coconut soap and superfatted). On the other hand, the use of known high sudsing anionic surfactants with lather boosters can yield acceptable lather volume and quality. Unfortunately, however, the highest suαsing anionic surfactants are, in fact, poor in clinical skin mildness. Surfactants that are among the mildest, such as sodium lauryl glyceryl ether sulfonate, (AGS), are marginal in lather. These two facts maxe

the balancing of the surfactant selection and the lather and skin feel benefit a delicate process.

Rather stringent requirements for cosmetic cleansers limit the choice of surface-active agents, and final formulations represent some degree of compromise. Mildness is often obtained at the expense of effective cleansing, or lathering may be sacrificed for either mild¬ ness, product stability, or both.

Thus a need exists for foaming cosmetic compositions which will produce a foam which is abundant, stable and of high quality (com- pactness), which are effective skin and hair cleansers and which are very mild to the skin, hair and occular mucosae.

It has been found that the use of specific polyol alkoxy esters in combination with specific amphoteric surfactants provide cosmetic cleansing compositions with significantly improved dermal mildness benefits and also good physical characteristics such as foaming.

It is therefore an object of the present invention to provide an improved cosmetic cleansing composition which thoroughly cleanses the skin and hair and which is very mild to the skin, hair and occular mucosae. It is a further object of the present invention to provide an improved cosmetic cleansing composition which is mild and which will produce a foam which is abundant, stable and of high quality, and which effectively cleans skin and hair.

SUMMARY OF THE INVENTION The present invention relates to foaming cosmetic compositions suitable for cleansing the skin or hair and which may be used as make-up removers and facial cleansers, bath foams, shower products, shampoos, and the like comprising:

(a) from about 0.1% to about 7.0% by weight on a solids basis of a first amphoteric surfactant of formula I selected from imidazolinium derivatives:

Y

! ^♦ R1CONHCH2CH2N— Z

CH2CH2OR2

wherein i is C8-C22 alkyl or alkenyl, R is hydrogen or CH2COOM, Z is H, CH2COOM, CH2CH2COOM, or CH2CHOHCH2SO3M, Y is H, CH2COOM, CH2CH2COOM, or CH2CHOHCH2SO3M and M is H, alkali metal, alkaline earth metal, ammonium or alkanol- ammonium;

(b) from about 0.1% to about 5.0% of a polyol alkoxy ester; and

(c) from about 60% to about 99.5% water; wherein the ratio of (a):(b) is from about 15:1 to about 1:3 and wherein the cleansing composition has a viscosity of at least about 150 cps (Brookfield RVT, Spindle No TB, 10 rpm, 25°C).

All concentrations and ratios herein are by weight of total compo¬ sition and all measurements are at 25°C, unless otherwise specified. DETAILED DESCRIPTION OF THE INVENTION The invention relates to a foaming cosmetic composition with superior mildness and excellent lathering characteristics (abundance, quality) and good cleansing ability. The foaming cosmetic composition take the form of a viscous liquid, paste or gel which has the advan¬ tage that it can be easily and commercially packaged in and dispensed from pump bottles or from tubes by squeezing. Gel form compositions are defined herein as those which have a viscosity (Brookfield RVT, Spindle No. TB, 10 rpm, 25°C) of at least 10,000 cps. Preferred from the viewpoint of flowability are gel compositions having a viscosity in the range from about 10,000 to about 50,000 cps, more preferably from about 10,000 to about 20,000 cps. Viscous liquids or pastes are defined herein as those having a viscosity (same conditions) of at least about 150 cps, preferably at least about 500 cps and less than about 10,000 cps, and more preferably between about 5,000 cps and about 9,000 cps. Surfactant The essential surfactant component of the compositions of the present invention is an amphoteric surfactant selected from imida- zolinium surfactants of formula I

R1CONHCH2CH2N-Z

CH2CH2OR2

wherein Ri is C8-C22 alkyl or alkenyl, R2 is hydrogen or CH2COOM, Z is H, CH2COOM, CH2CH2COOM, or CH2CHOHCH2SO3M, Y is H, CH2COOM, CH2CH2COOM, or CH2CHOHCH2SO3M and M is H, alkali metal, alkaline earth metal, ammonium or alkanol- 5 ammonium;

These amphoteric surfactants are present in the compositions of the present invention at a level of from about 0.1% to about 7%, prefer¬ ably from about 0.1% to about 5%, more preferably from about 0.1% to about 3% and most preferably from about 0.1% to about 2.5%, on a 10 solids basis.

Examples of suitable amphoteric surfactants for use herein include compounds in which Ri is C8H17 (especially iso-capryl), CβHig, C11H23 and C12H25 alkyl. Especially preferred are the compounds in which Ri is 12H25, Z is CH2CO2M, Y is CH2COOM and R2 is H. These surfactants •5 are all fully described in Miranol Products for Cosmetics and Toilet¬ ries Technical and Product Development. Tenth Edition (1987); which is incorporated by reference herein.

It will be understood that a number of commercially-avaiTable amphoteric surfactants of this type are manufactured and sold in the 0 form of complexes with anionic surfactants, especially those of the sulfated Cβ-Ciβ alcohol or Cs-Cis acyl glyceride types. More prefer¬ ably, the compositions comprise the surfactant component along with a premix or complex of the optional amphoteric surfactant and anionic surfactant in an equivalent ratio of about 1:1 in order to provide 5 approximate electroneutrality.

In a preferred embodiment of the present invention, the composi¬ tions comprise a second amphoteric surfactant being selected from aminoalkanoates of formula II

RlNH(CH2) _n θ2M II

iminodialkanoates of formula III

RlN[(CH2)mC0 ₂ M]2 III t and mixtures thereof, wherein π and m are numbers from 1 to 4. and Ri and M are independently selected from the groups specified in I above.

The compositions herein can also comprise other optional surfactant components, notably, anionic surfactants. It is an important feature of the invention, however, that the combined concentration of the first and the optional second amphoteric surfactants is at least about 30% by weight of the total surfactant concentration, this being important from the viewpoint of achieving optimum lathering character¬ istics. In preferred compositions, the mixture of the first and second amphoteric surfactants comprises at least about 60%, more preferably at least about 75% by weight of the total surfactant composition.

Examples of suitable optional amphoteric surfactants for use herein include salts, especially the triethanolammonium salts and salts of

N-lauryl-beta-aminopropionic acid and N-laurylimino-dipropionic acid.

The compositions herein preferably contain from about 1% to about 10% by weight, more preferably from about 1.5% to about 5% by weight of each of the first and second amphoteric surfactants. The weight ratio of first amphoteric surfactant : second amphoteric surfactant is preferably from about 10:1 to about 1:10, more preferably from about

5:1 to about 1:5, and especially from about 3:1 to about 1:3. A preferred optional surfactant in the compositions herein is an anionic surfactant. This is preferably present in a level of from about 0.1% to about 10%, more preferably from about 1.0% to about 8%, and especially from about 4% to about 6% by weight. Preferred anionic surfactants for inclusion herein, other than the alkyl and acylglycer- ide sulfates mentioned above, are the fatty acid condensation products of proteins, degraded proteins or amino acids, or mixtures of such condensation products. In highly preferred embodiments, the fatty acid condensation products are selected from:

(i) condensation products of C8-C12, preferably Cio-Cis fatty acids with hydrolysed proteins

(ii) fatty acid sarconsinates derived from Cs-C22» preferably

Cio-Cis fatty acids, and (iii) mixtures thereof.

However, the total level of surfactant in the compositions herein should generally lie in the range from about 1% to about 20% by weight, preferably from about 1% to about 15% by weight, and especial¬ ly from about 2% to about 7% by weight.

Polvol Alkoxy Ester

The compositions of the present invention also essentially comprise a polyol alkoxy ester. These non-ionic compounds are high molecular weight (from abut 4,000 to about 8,000 preferably from about about 6,000 to about 8,000) branched polyethylene glycol compounds. A highly preferred polyol alkoxy ester is available from Croda, Inc. under the trade name Crothix. The polyol alkoxy ester is present in the composition at a level of from about 0.1% to about 5%, preferably from about 0.5% to about 3%, and most preferably from about 1% to about 2%.

The amphoteric surfactant and polyol alkoxy ester are present in a ratio of amphoteric surfactant:polyol alkoxy ester of from about 10:1 to about 1:3, preferably from about 5:1 to about 1:3 and most prefer¬ ably from about 3:1 to about 1:3. Optional Components

The compositions of the invention may also contain additional thickeners at a level preferably from about 0.1% to about 10%, more preferably from about 0.1% to about 5%, and especially from about 0.3% to about 4%. The thickener preferably has a viscosity (1% aqueous solution, 25°C, Brookfield RVT Spindle No TB, 5 rpm) of at least about 4000 cps, more preferably at least about 10,000 cps.

Neutralizing agents suitable for use in neutralizing acidic group containing hydrophilic thickeners herein including sodium hydroxide, potassium hydroxide, ammonium hydroxide, monoethanolamine, diethanϊo- lamine and triethanolamine.

The compositions of the invention can optionally include a hair or skin moisturizer. The preferred level of moisturizer is from about 1% to about 20% by weight. In preferred embodiments, the moisturizer is nonocclusive and 1s selected from: 1. water-soluble liquid polyols;

2. essential amiπo acid compounds found naturally occurring in the stratum corneum of the skin; and

3. water-soluble nonocclusives and mixtures thereof.

Some examples of more preferred nonocclusive moisturizers are glycerine, polyethylene glycol, propylene glycol, sorbitol, polyethy¬ lene glycol and propylene glycol esters of methyl glucose (e.g. methyl gluxan-20), polyethylene glycol and propylene glycol esters of lanolin alcohol (e.g. Solulan-75), sodium pyrrolidone carboxylic acid, lactic

acid, urea, L-proline, guanidine, pyrrolidone and mixtures thereof. Of the above, glycerine is highly preferred.

Examples of other water-soluble nonocclusive moisturizers include water-soluble hexadecyl, myristyl, isodecyl or isopropyl esters of adipic, lactic, oleic, stearic, isostearic, yristic or linoleic acids, as well as many of their corresponding alcohol esters (sodium isostearoyl-2-lactylate, sodium capryl lactylate), hydrolyzed protein and other collagen-derived proteins, aloe vera gel and acetamide MEA. The compositions of the invention can additionally comprise from about 0.05% to about 5% by weight of cationic or nonionic polymeric hair or skin conditioning agents. Representatives classes of poly¬ meric hair or skin conditioning agents include cationic and nonionic polysaccharides; cationic and nonionic homopolymers and copolymers derived from acrylic and/or ethacrylic acid; cationic and nonionic cellulose resins; cationic copolymers of dimethyldiallylammonium chloride and acrylic acid; cationic homopolymers of dimethyldiallyl¬ ammonium chloride; cationic polyalkylene and ethoxypolyalkene imines, and mixtures thereof.

By way of exemplification, cationic polymeric conditioning agents preferred for use herein include cationic guar gums such as hydroxy- propyl trimethyl ammonium guar gum (d.s. of from 0.11 to 0.22) avail¬ able commercially under the trade names Jaguar C-14-S(RTM) and Jaguar C-17(RTM), and also Jaguar C-16(RTM), which contains hydroxypropyl substituents (d.s. of from 0.8 - 1.1) in addition to the above-speci- fied cationic groups, and quatnerized cellulose esters available commercially under the trade names Ucare Polymer JR and Celquat. Other suitable cationic polymers are homopolymers of dimethyldiallyl¬ ammonium chloride available commercially under the trade name Merquat 100, copolymers of dimethyl aminoethylmethacrylate and acrylamide, copolymers of dimethyldiallylammonium chloride and acrylamide, avail¬ able commercially under the trade names Merquat 550 and Merquat S, quaternized vinyl pyrrol!idone acrylate or methacrylate copolymers of amino alcohol available commercially under the trade name Gafquat, and polyalkylenimines such as polyethylenimime and ethoxylated polyethyl- enimine.

A number of additional optional materials can be added to the compositions of the invention. Such materials include keratolytic agents such as salicylic acid; proteins and polypeptides and deriva¬ tives thereof; water-soluble or solubilizable preservatives such as

Germall 115, methyl, ethyl, propyl and butyl esters of hydroxybenzoic acid, EDTA, Euxyl (RTM) K400, Bronopol (2-bromo-2-nitropropane-l, 3-diol); anti-bacterials such as Irgasan (RTM), phenoxyethanol and phenoxypropanol (preferably at levels of from about 0.2% to about 5%); other moisturizing agents such as hyaluronic acid, chitin, and starch- grafted sodium polyacrylates such as Sanwet (RTMO IM-1000, IM-1500 and IM-2500 available from Celanese Superabsorbent Materials, Portsmith, VA, USA and described in USA-A-4,076,663; colouring agents; Pearling agents; perfumes and perfume solubilizers etc. Water is also present at a level of from about 50% to about 98.9%, preferably from about 70% to about 95% by weight of the compositions herein.

The pH of the compositions is preferably from about 4 to about 9. more preferably from about 4.5 to about 7.

The following examples further describe and demonstrate embodiments within the scope of the present invention. The examples are given solely for the purpose of illustration and are not to be construed as limitations of the present invention, as many variations thereof are possible without departing from the spirit and scope of the invention.

Ingredients are identified by chemical or CTFA name. Example I

A facial cleansing composition of the present invention is made as follows:

Ingredient % w/w

Phase A Water q.s.

Polyquaternium -10 0.50

Phase B

Potassium Coco Hydrolyzed Animal Protein2 • 15.0 Amphoteric Surfactant 1-3 5.1

Amphoteric Surfactant II* 6.8

Amphoteric Surfactant II15 7.3

Phase C

Glycerin 3.0 Polyol Alkoxy Ester ⁶ 1.6

PEG-120 Methyl Glucose Dioleate? 0.6 Phase D Preservative (phenoxyethanol) 0.4

Phase E

Water 1.0

Na EDTA 0.1

1 Available as Polymer JR 400

2 Available as Lamepon S

³ Cocoamphocarboxyglycinate (and) Na Lauryl Sulfate (and) Hexylene Glycol available as Miranol 2MCA MOD * Na Lauryl Sarcosinate available as Hamposyl- L-30 5 Na Lauriminodipropionate available as Mirataine H2C-HA ^δ Available as Crothix ⁷ Available as Glucamate DOE-120

The water is heated to 65°C and the polyquaternium-10 is added to the water to form Phase A. The Phase B ingredients are added sequen¬ tially to this phase. Separately, the Phase C components are heated to 65°C. Phase C is combined with this mixture and then cooled to 40°C. Phase D and Phase E are added to this mix to form the resultant cosmetic composition.

Application of approximately 2 grams of the resulting gel/viscous liquid with water is useful for topical application as a cleanser to remove, for example, dirt and oil as well as difficult to remove make-up, waterproof mascara and the like.

Example II A facial cleansing composition of the present invention is made by combining the following ingredients utilizing conventional mixing techniques as described above in Example I.

Ingredient % w/w

Phase A

Water q.s.

Polyquaternium -lθl 0.50 Phase B

Amphoteric Surfactant I ² 15.1

Amphoteric Surfactant II ³ 4.0

Phase C Glycerin 3.0

1 Available as Polymer JR 400 2 Na Lauriminodipropionate available as Mirataine H2C-HA

³ Cocoamphocarboxyglycinate (and) Na Lauryl Sulfate (and)

Hexylene Glycol available as Miranol 2MCA MOD * Available as Crothix

⁵ Available as Glucamate DOE-120

Application of approximately 2 grams of the resulting gel/viscous liquid with water is useful for topical application as a cleanser to remove, for example, dirt and oil as well as difficult to remove make-up, waterproof mascara and the like.

Example III A facial cleansing composition of the present invention is made by combining the following ingredients utilizing conventional mixing techniques as described above in Example I.

Ingredient % w/w

Phase A

Water q.s. Polyquaternium -lθl 0.50

Phase B

Amphoteric Surfactant l2 15.1

Amphoteric Surfactant II ³ 4.0

¹ Avai l abl e as Polymer JR 400

2 Na Lauriminodipropionate available as Deriphat 160C ³ Cocoamphocarboxyglycinate (and) Na Lauryl Sulfate (and) Hexylene Glycol available as Miranol 2MCA MOD

⁴ Available as Crothix

5 Available as Aculyn 22

Application of approximately 2 grams of the resulting gel/viscous liquid with water is useful for topical application as a cleanser to remove, for example, dirt and oil as well as difficult to remove make-up, waterproof mascara and the like.

Example IV A facial cleansing composition of the present invention is made by combining the following ingredients utilizing conventional mixing techniques as described above in Example I. Ingredient % w/w

Phase A

Water q.s.

Polyquaternium -10 0.50

Phase B Amphoteric Surfactant 1 8.0

Amphoteric Surfactant II ³ 8.0

1 Available as Polymer JR 400

2 Lauroamphodiacetate (and) Na Trideceth Sulfate avail ble as Miranol BT Na Lauriminodipropionate available as Mirataine H2C-HA

⁴ Available as Crothix

⁵ Available as Glucomate DOE-120

Application of approximately 2 grams of the resulting gel/viscous liquid with water is useful for topical application as a cleanser to remove, for example, dirt and oil as well as difficult to remove make-up, waterproof mascara and the li e.

WHAT IS CLAIMED: