Cosmetic composition for skin care

Abstract

A cosmetic composition in the form of an oil-in-water emulsion comprising (i) at least one solid fatty alcohol; (ii) at least one amino acid surfactant; and (iii) at least one gelling agent selected from the group consisting of hydrophilic acrylic homopolymers and amphiphilic acrylic polymers. A non-therapeutic method for caring for the skin comprising applying the cosmetic composition to the skin.

Description

This application is a divisional application of the Chinese patent application with application number 202080099286.7 (international application number PCT / CN2020 / 082248), application date March 31, 2020, and invention name “Cosmetic composition for skin care”. Technical Field

[0001] The present invention relates to cosmetic compositions. In particular, the present invention relates to cosmetic compositions for caring for keratin materials, especially the skin. Background Art

[0002] The development of formulations dedicated to the care and / or make-up of the skin and / or lips is permanent. Such formulations must exhibit satisfactory properties with regard to application (e.g. ease of use) and with regard to the sensory properties after application (e.g. feeling of hydration and / or moisturization).

[0003] The skin is the body's protective barrier. It protects the body's interior from physical damage (such as trauma) and biological damage (such as bacteria, viruses or fungi). The human skin consists of the dermis and epidermis. The epidermis is the top layer of the skin, and its surface layer is called the stratum corneum.

[0004] The skin is provided with moisture by water in the deeper layers and by perspiration. Disorders of skin moisture, and in particular dry skin, are usually observed with age (growth) and / or changes in climate. However, such conditions may also manifest in young individuals.

[0005] A wide variety of cosmetic compositions have been used to care for the skin, particularly to provide moisturizing or hydration to the skin. These compositions typically contain lipophilic moisturizers that inhibit water loss via occlusion. These compositions may additionally contain other skin benefit agents, such as vitamins and moisturizers. Adding these ingredients can increase the moisturizing of the skin. For example, efforts have been made to formulate compositions in the form of creams or lotions. Due to the thick texture of the composition, it is possible to provide a moisturizing sensation to the skin via occlusion. Emulsions are typically in the form of water-in-oil emulsions.

[0006] However, these types of products remain unsatisfactory.

[0007] Consumers feel unpleasant greasiness after applying the product. In addition, due to the thick texture of the product, it is not easy to apply it evenly on the skin.

[0008] Therefore, there is still a need to formulate stable compositions for caring for the skin which have good cosmetic properties, in particular moisturizing and / or hydrating the skin without a greasy feel.

[0009] Furthermore, the composition is expected to have a good texture and spread easily on the skin during application.

[0010] It would therefore be desirable to provide stable skin care compositions that exhibit excellent texture as well as application and sensory properties. Summary of the invention The Applicant has now found that it is possible to formulate such compositions having the desired properties as described above.

[0012] In particular, the Applicant has found that it is possible to formulate stable compositions for caring for and / or making up keratin materials which exhibit excellent textural and application and sensory properties.

[0013] Thus, in a first aspect, the present invention relates to a cosmetic composition in the form of an oil-in-water emulsion comprising: (i) at least one solid fatty alcohol; (ii) at least one amino acid surfactant; and (iii) at least one gelling agent selected from the group consisting of hydrophilic acrylic homopolymers and amphiphilic acrylic polymers.

[0014] The cosmetic composition of the present invention is in the form of an oil-in-water emulsion. Thus, the cosmetic composition comprises a continuous aqueous phase and a dispersed fatty phase.

[0015] In a second aspect, the present invention relates to a non-therapeutic method for caring for the skin, comprising applying to the skin a cosmetic composition according to the first aspect of the invention.

[0016] The composition of the present invention can be easily and evenly applied to the skin without the need for prolonged massaging with the fingers.

[0017] The cosmetic compositions of the present invention exhibit excellent texture as well as application and sensory properties.

[0018] The composition according to the present invention as described above is stable over time at high temperature (45° C.), for example after 2 months of storage, and further for example after 3 months of storage.

[0019] Further advantages of the invention will emerge more clearly on reading the following (detailed) description and the examples. DETAILED DESCRIPTION According to a first aspect, the present invention relates to a cosmetic composition in the form of an oil-in-water emulsion comprising: (i) at least one solid fatty alcohol; (ii) at least one amino acid surfactant; and (iii) at least one gelling agent selected from the group consisting of hydrophilic acrylic homopolymers and amphiphilic acrylic polymers.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. When the definition of a term in this specification conflicts with the meaning commonly understood by those skilled in the art to which the invention belongs, the definition described herein shall apply.

[0022] In the following and unless otherwise indicated, the limits of the numerical range are included in the range, especially in the expressions "between... and... " and "in the range of... to... ".

[0023] Furthermore, the expression “at least one / at least one” used in the present specification is equivalent to the expression “one or more / one or more”.

[0024] Throughout this application, the term "comprising / including" should be interpreted as covering all specifically mentioned features as well as optional, additional, unspecified features. As used herein, the use of the term "comprising / including" also discloses embodiments in which there are no features other than the specifically mentioned features (i.e., "consisting of ...").

[0025] Unless otherwise indicated, all numerical values ​​expressing quantities of ingredients and so forth used in the specification and claims are to be understood as modified by the term “about.” Accordingly, unless indicated to the contrary, the numerical values ​​and parameters described herein are approximations that can vary as necessary depending on the desired purpose.

[0026] Unless otherwise specified, all percentages in the present invention are by weight.

[0027] Solid fatty alcohol According to a first aspect, the cosmetic composition according to the invention comprises at least one solid fatty alcohol.

[0028] "Solid fatty alcohol" means a linear or branched, saturated or unsaturated fatty alcohol that is solid at room temperature (25°C) and atmospheric pressure (780 mmHg or 1 atm). The fatty alcohols are water-insoluble, i.e., they have a solubility in water of less than 1% by mass and preferably less than 0.5% by weight.

[0029] Preferably, the solid fatty alcohol has the structure R—OH, wherein R represents a saturated or unsaturated straight chain alkyl group, optionally substituted with one or more hydroxyl groups, containing from 14 to 30 carbon atoms.

[0030] Preferably, the solid fatty alcohols are chosen from those having from 14 to 30 carbon atoms.

[0031] Preferably, the solid fatty alcohol having 14 to 30 carbon atoms can be selected from myristyl alcohol (1-tetradecanol), cetyl alcohol (1-hexadecanol), palmitoleyl alcohol (cis-9-hexadecene-1-ol), stearyl alcohol (1-octadecyl alcohol), arachidyl alcohol (1-eicosanol), behenyl alcohol (1-docosanol), erucyl alcohol (cis-13-docosen-1-ol), xylanol (1-tetracosanol), wax alcohol (1-hexacosanol), myricyl alcohol and melissyl alcohol (1-triacontanol).

[0032] More preferably, according to the present invention, the solid fatty alcohol is chosen from alcohols having 14 to 22 carbon atoms, such as cetyl alcohol (1-hexadecanol), stearyl alcohol (1-octadecyl alcohol), arachidyl alcohol (1-eicosanol), behenyl alcohol (1-docosanol), and mixtures thereof.

[0033] More preferably, the solid fatty alcohol is selected from cetyl alcohol (1-hexadecanol), stearyl alcohol (1-octadecyl alcohol), arachidyl alcohol (1-eicosanol), behenyl alcohol (1-docosanol), and mixtures thereof.

[0034] Solid fatty alcohols may be mentioned which are manufactured by BASF under the name 16 Cetyl alcohol sold under the name 22 Behenyl alcohol, or a mixture thereof, sold.

[0035] Advantageously, the solid fatty alcohol is present in an amount ranging from 0.1% to 10% by weight, preferably from 0.2% to 5% by weight and more preferably from 0.5% to 3% by weight relative to the total weight of the composition.

[0036] Amino Acid Surfactant According to a first aspect, the composition of the present invention comprises at least one amino acid surfactant.

[0037] In one embodiment, the amino acid surfactant is derived from a carboxylate salt of an amino acid, wherein the amine group located on the α-carbon or β-carbon of the amino acid salt is replaced by a C8 to C 22 Acylation of fatty acid derivatives.

[0038] The carboxylates of these amino acids can be formed by conventional means, for example, by neutralizing the corresponding amino acid with a base. In the presence of a base, the amine group located on the α-carbon or β-carbon of the neutralized amino acid is acylated with a fatty acid acyl halide (acyl halide) to produce an amide, thereby forming the desired surfactant reaction product, i.e., an amino acid surfactant. Suitable acyl halides for acylation of amino acid carboxylates include acyl chlorides, acyl bromides, acyl fluorides, and acyl iodides. The amine group can be acylated by acylating a saturated or unsaturated, linear or branched C8 to C 22 Fatty acid and thionyl halide (thionyl bromide, thionyl chloride, thionyl fluoride and thionyl iodide) reaction are prepared acyl halide.Representative acyl halide includes but is not limited to be selected from following acyl chloride: decanoyl chloride, dodecanoyl chloride (lauroyl chloride), cocoyl chloride (fatty acyl chloride obtained from coconut oil), tetradecanoyl chloride (myristoyl chloride), hexadecanoyl chloride (palmitoyl chloride), octadecanoyl chloride (stearoyl chloride), 9-octadecenoyl chloride (oleoyl chloride), eicosanoyl chloride (arachidyl chloride), docosanoyl chloride (behenyl chloride), and any mixture thereof.Other acyl halide comprises bromide, fluoride and iodide of aforementioned fatty acid.The method for preparing acyl halide and the alternative method for acylated amino acid are described in the U.S. Patent Application Publication No. 2008 / 0200704 announced on August 21, 2008, and the application is incorporated herein by reference.

[0039] In one embodiment, the amino acid surfactant is represented by formula (A): in: Z represents a saturated or unsaturated straight or branched hydrocarbon group having 8 to 22 carbon atoms, X is hydrogen or methyl, n is 0 or 1, Y is selected from hydrogen, -CH3, -CH(CH3)2, -CH2CH(CH3)2, -CH(CH3)CH2CH3, -CH2C6H5, -CH2C2H4OH, -CH2OH, -CH(OH)CH3, -(CH2)4NH2, -(CH2)3NHC(NH)NH2, -CH2C(O)O - M + , -(CH2)2C(O)OH, -(CH2)2C(O)O - M + ,and M is a salt-forming cation such as sodium, potassium, ammonium or triethanolamine.

[0040] In one embodiment, in formula (A): Z represents a straight or branched chain C8 to C 22 an alkyl or alkenyl group, X is hydrogen or methyl, n is 0, Y is selected from hydrogen, -(CH2)2C(O)OH, -(CH2)2C(O)O - M + ,and M is a salt-forming cation such as sodium, potassium, ammonium or triethanolamine.

[0041] According to a preferred embodiment of the present invention, in the amino fatty acid of formula (A): Z represents a straight or branched chain C8 to C 22 an alkyl or alkenyl group, X is hydrogen or methyl, n is 0, Y is selected from hydrogen, -(CH2)2C(O)OH, -(CH2)2C(O)O - M + ,and M is a salt-forming cation such as sodium, potassium, ammonium or triethanolamine.

[0042] Examples of amino acid surfactants are salts of alanine, arginine, aspartic acid, glutamic acid, glycine, isoleucine, leucine, lysine, phenylalanine, serine, tyrosine, valine, sarcosine, and any mixtures thereof.

[0043] More specifically, there can be mentioned, for example, the following amino acid surfactants: dipotassium capryloyl glutamate, dipotassium undecylenoyl glutamate, disodium capryloyl glutamate, disodium cocoyl glutamate, disodium lauroyl glutamate, disodium stearoyl glutamate, disodium undecylenoyl glutamate, potassium capryloyl glutamate, potassium cocoyl glutamate, potassium lauroyl glutamate, potassium myristoyl glutamate, potassium stearoyl glutamate, potassium undecylenoyl glutamate, sodium capryloyl glutamate, sodium cocoyl glutamate, sodium lauroyl glutamate, sodium myristoyl glutamate, sodium oliveoyl glutamate, sodium palmitoyl glutamate, sodium stearoyl glutamate, sodium undecylenoyl glutamate, cocoyl methyl β-alaninate, lauroyl β-alaninate, lauroyl methyl β-alaninate, myristoyl β-alaninate, potassium lauroyl methyl β-alaninate, sodium cocoyl alaninate, sodium cocoyl methyl β-alaninate and Sodium Myristoyl Methyl Beta-Alanine, Palmitoyl Glycinate, Sodium Lauroyl Glycinate, Sodium Cocoyl Glycinate, Sodium Myristoyl Glycinate, Potassium Lauroyl Glycinate, Potassium Cocoyl Glycinate, Potassium Lauroyl Sarcosinate, Potassium Cocoyl Sarcosinate, Sodium Cocoyl Sarcosinate, Sodium Lauroyl Sarcosinate, Sodium Myristoyl Sarcosinate, Sodium Oleoyl Sarcosinate, Sodium Palmitoyl Sarcosinate, Ammonium Lauroyl Sarcosinate, Sodium Lauroyl Aspartate, Myristoyl Aspartate Sodium aspartate, sodium cocoyl aspartate, sodium caproyl aspartate, disodium lauroyl aspartate, disodium myristoyl aspartate, disodium cocoyl aspartate, disodium caproyl aspartate, potassium lauroyl aspartate, potassium myristoyl aspartate, potassium cocoyl aspartate, potassium caproyl aspartate, dipotassium lauroyl aspartate, dipotassium myristoyl aspartate, dipotassium cocoyl aspartate, dipotassium caproyl aspartate, and mixtures thereof.

[0044] More preferably, the amino acid surfactant used in the composition is selected from salts of glutamic acid, in particular dipotassium capryloyl glutamate, dipotassium undecylenoyl glutamate, disodium capryloyl glutamate, disodium cocoyl glutamate, disodium lauroyl glutamate, disodium stearoyl glutamate, disodium undecylenoyl glutamate, potassium capryloyl glutamate, potassium cocoyl glutamate, potassium lauroyl glutamate, potassium myristoyl glutamate, potassium stearoyl glutamate, potassium undecylenoyl glutamate, sodium capryloyl glutamate, sodium cocoyl glutamate, sodium lauroyl glutamate, sodium myristoyl glutamate, sodium oliveoyl glutamate, sodium palmitoyl glutamate, sodium stearoyl glutamate, sodium undecylenoyl glutamate.

[0045] Preferably, the amino fatty acid surfactant is present in the composition in an amount ranging from 0.1% to 5%, preferably from 0.2% to 3%, more preferably from 0.3% to 2%, relative to the total weight of the composition.

[0046] Hydrophilic gelling agent According to a first aspect, the cosmetic composition of the present invention comprises at least one gelling agent selected from hydrophilic acrylic homopolymers and amphiphilic acrylic polymers.

[0047] a- Hydrophilic acrylic homopolymer According to the invention, the term "hydrophilic acrylic homopolymer" especially denotes a non-hydrophobic and non-amphiphilic acrylic homopolymer.

[0048] The presence of this hydrophilic acrylic homopolymer makes it possible in particular to obtain compositions having good stability properties.

[0049] According to one embodiment, the hydrophilic acrylic homopolymer comprises at least one monomer carrying a sulfonic group.

[0050] The homopolymers used according to the invention are homopolymers obtainable from ethylenically unsaturated monomers carrying sulfonic groups, either in free form or in partly or completely neutralized form.

[0051] Preferably, the homopolymers are partially or completely neutralized with an inorganic base (sodium hydroxide, potassium hydroxide or ammonia) or an organic base (e.g. monoethanolamine, diethanolamine, triethanolamine, aminomethylpropanediol, N-methylglucamine, basic amino acids such as arginine and lysine, and mixtures of these compounds). They are usually neutralized.

[0052] In the present invention, the term "neutralized" means a homopolymer that is completely or substantially completely neutralized, ie, at least 90% neutralized.

[0053] The homopolymers used in the composition of the invention generally have a number average molecular weight in the range of 1000 to 20000000 g / mol, preferably in the range of 20000 to 5000000 g / mol and even more preferably in the range of 100000 to 1500000 g / mol.

[0054] These homopolymers according to the invention may be crosslinked or uncrosslinked. The monomers carrying sulfonic groups of the homopolymers used in the composition according to the invention are especially chosen from vinylsulfonic acid, styrenesulfonic acid, (meth)acrylamido(C1-C22)alkylsulfonic acids, N-(C1-C22)alkyl(meth)acrylamido(C1-C22)alkylsulfonic acids (e.g. undecylacrylamidomethanesulfonic acid), and also partially or completely neutralized forms thereof, and mixtures thereof.

[0055] According to a preferred embodiment of the invention, the monomers carrying sulfonic groups are selected from (meth)acrylamido(C1-C22)alkylsulfonic acids, such as acrylamidomethanesulfonic acid, acrylamidoethanesulfonic acid, acrylamidopropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-methacrylamido-2-methylpropanesulfonic acid, 2-acrylamido-n-butanesulfonic acid, 2-acrylamido-2,4,4-trimethylpentanesulfonic acid, 2-methacrylamidododecylsulfonic acid and 2-acrylamido-2,6-dimethyl-3-heptanesulfonic acid; and also partially or completely neutralized forms thereof; and mixtures thereof.

[0056] More specifically, 2-acrylamido-2-methylpropanesulfonic acid is used. and also partially or completely neutralized forms thereof.

[0057] When the homopolymer is crosslinked, the crosslinking agent may be chosen from the polyethylenically unsaturated compounds usually used for crosslinking polymers obtained by free-radical polymerization.

[0058] Examples of crosslinkers that may be mentioned include divinylbenzene, diallyl ether, dipropylene glycol diallyl ether, polyethylene glycol diallyl ether, triethylene glycol divinyl ether, hydroquinone diallyl ether, ethylene glycol or tetraethylene glycol di(meth)acrylate, trimethylolpropane triacrylate, methylenebisacrylamide, methylenebismethacrylamide, triallylamine, triallyl cyanurate, diallyl maleate, tetraallylethylenediamine, tetraallyloxyethane, trimethylolpropane diallyl ether, allyl (meth)acrylate, allylic ethers of alcohols of the sugar series or other allyl or vinyl ethers of polyfunctional alcohols, and also allyl esters of phosphoric acid and / or vinylphosphonic acid derivatives, or mixtures of these compounds.

[0059] According to a preferred embodiment of the invention, the crosslinking agent is selected from methylenebisacrylamide, allyl methacrylate and trimethylolpropane triacrylate (TMPTA). The degree of crosslinking is generally in the range of 0.01 mol% to 10 mol% and more particularly 0.2 mol% to 2 mol% relative to the homopolymer.

[0060] The homopolymer of the monomer having a sulfonic group may be crosslinked with one or more crosslinking agents.

[0061] These homopolymers are generally crosslinked and neutralized and can be obtained according to a preparation process comprising the following steps: (a) dispersing or dissolving a free-form monomer (e.g., 2-acrylamido-2-methylpropanesulfonic acid) in a solution of tert-butyl alcohol or a solution of water and tert-butyl alcohol; (b) neutralizing the monomer solution or dispersion obtained in (a) with one or more inorganic or organic bases, preferably aqueous ammonia, in such an amount that it is possible to obtain a degree of neutralization of the sulfonic acid functions of the homopolymer ranging from 90% to 100%; (c) adding a crosslinking monomer to the solution or dispersion obtained in (b); (d) Standard free radical polymerization is carried out at a temperature in the range of 10 to 150° C. in the presence of a free radical initiator; the homopolymer is precipitated in a solution or dispersion based on tert-butanol.

[0062] Preferred AMPS homopolymers are generally characterized in that they contain a random distribution of: a) 90% to 99.9% by weight of units of the following general formula (I): Where X + represents a proton, an alkali metal cation, an alkaline earth metal cation or an ammonium ion, not exceeding 10 mol % of the cation X + Probably proton H + ; b) 0.01% to 10% by weight of crosslinking units from at least one monomer containing at least two olefinic double bonds; the weight proportions are defined relative to the total weight of the homopolymer.

[0063] Very particularly preferred homopolymers according to the invention comprise 98 to 99.5% by weight of units of the formula (I) and 0.2 to 2% by weight of crosslinking units.

[0064] Homopolymers of this type which may be mentioned in particular are those sold by the company Clariant under the trade name AMPS (CTFA name: ammonium polyacryloyldimethyltaurate) is a marketed crosslinked and neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymer.

[0065] b- Amphiphilic acrylic polymer Such polymers can be obtained from the above described product.

[0066] These polymers contain both a hydrophilic part and a hydrophobic part containing at least one fatty chain. They are therefore amphiphilic polymers.

[0067] The fatty chains of such polymers may contain 7 to 30 carbon atoms and especially 8 to 22 carbon atoms.

[0068] According to the present invention The copolymer may have a weight average molecular weight ranging from 50,000 to 10,000,000, specifically 100,000 to 8,000,000, and more specifically 100,000 to 7,000,000.

[0069] According to the present invention The copolymers may be cross-linked or non-cross-linked.

[0070] Among the crosslinkers that may be suitably used, mention may be made in a non-limiting manner of methylenebisacrylamide, allyl methacrylate and trimethylolpropane triacrylate (TMPTA).

[0071] The degree of crosslinking may be in the range of 0.01 mol % to 10 mol %, and specifically 0.2 mol % to 2 mol %, relative to the polymer.

[0072] Suitable amphiphiles for use in the present invention The polymer may be chosen, for example, from statistical amphiphilic AMPS polymers modified by reaction with C6-C22 n-mono- or di-n-alkylamines, such as those described in patent application WO 00 / 31154.

[0073] These polymers may also contain other ethylenically unsaturated hydrophilic monomers selected, for example, from acrylic acid, methacrylic acid or alkyl-substituted derivatives thereof or esters thereof with mono- or polyalkylene glycols, acrylamide, methacrylamide, vinyl pyrrolidone, itaconic acid and maleic acid, or mixtures thereof.

[0074] The polymer of the present invention can be selected from and at least one amphiphilic polymer of ethylenically unsaturated monomers comprising at least one hydrophobic moiety containing from 7 to 30 carbon atoms, specifically from 8 to 22 carbon atoms and more specifically from 12 to 20 carbon atoms.

[0075] The hydrophobic portion may be a saturated or unsaturated straight chain hydrocarbon group (eg, n-octyl, n-decyl, n-hexadecyl, n-dodecyl, or oleyl), a branched chain hydrocarbon group (eg, isostearyl), or a cyclic hydrocarbon group (eg, cyclododecane or adamantane).

[0076] Ethylenically unsaturated hydrophobic monomers suitable for use in the present invention may be selected from acrylates or acrylamides of the following formula (II): in: R 27 represents a hydrogen atom or a straight-chain or branched C1-C6 alkyl group (preferably a methyl group), Y represents O or NH; R 28 It refers to a hydrophobic group comprising an aliphatic chain containing from 7 to 30 carbon atoms, preferably from 8 to 22 carbon atoms and more particularly from 12 to 20 carbon atoms.

[0077] Hydrophobic group R 28 Selected from saturated or unsaturated straight chain C7-C22 a hydrocarbon group (e.g., n-octyl, n-decyl, n-hexadecyl, n-dodecyl, or oleyl), a branched hydrocarbon group (e.g., isostearyl), or a cyclic hydrocarbon group (e.g., cyclododecane or adamantane); C7-C 18 An alkyl perfluoro group (for example a group of formula (CH2)2(CF2)9-CF3); a cholesteryl group or a cholesteryl ester, for example cholesteryl hexanoate; an aromatic polycyclic group, for example naphthalene or pyrene.

[0078] Among these groups, linear alkyl groups and branched alkyl groups are more particularly preferred.

[0079] According to one embodiment of the present invention, the hydrophobic group R 28 It may also contain at least one oxyalkylene unit and in particular a polyoxyalkylene chain.

[0080] The polyoxyalkylene chain may be formed from ethylene oxide units and / or propylene oxide units and even more particularly may be formed exclusively from ethylene oxide units.

[0081] The number of moles of oxyalkylene units may generally range from 1 to 30 mol, more particularly from 2 to 25 mol, and even more particularly from 3 to 20 mol.

[0082] Suitable for use in the present invention Among the amphiphilic polymers, mention may be made of: A crosslinked or uncrosslinked, neutralized or unneutralized copolymer comprising, relative to the polymer, 15 to 60% by weight of AMPS units and 40 to 85% by weight of (C8-C 16 ) alkyl (meth) acrylamide unit or (meth) acrylic acid (C8-C 16 ) alkyl ester units, such as those described in patent application EP-A-750899; The polymer comprises 10 mol% to 90 mol% of acrylamide units, 0.1 mol% to 10 mol% of AMPS units and 5 mol% to 80 mol% of normal (C6-C 18 ) terpolymers of alkyl acrylamide units, such as those described in patent US-A-5089578.

[0083] As amphiphilic polymers suitable for use in the present invention, there can be mentioned and polyoxyethylenated (crosslinked or non-crosslinked) copolymers of alkyl methacrylates, and mixtures thereof.

[0084] As amphiphilic polymers suitable for use in the present invention, mention may also be made of completely neutralized Copolymers with n-dodecyl methacrylate, n-hexadecyl methacrylate and / or n-octadecyl methacrylate, and also copolymers of AMPS with n-dodecylmethacrylamide, which may be crosslinked or not crosslinked.

[0085] Mention may also be made of crosslinked or non-crosslinked amphiphilic copolymers comprising, or even formed from, the following units: 2-Acrylamido-2-methylpropanesulfonic acid of the following formula (III) unit: Wherein X can be a proton, an alkali metal cation, an alkaline earth metal cation or an ammonium ion; and units of the following formula (IV): in: n and p independently of one another represent molar numbers and are in the range of 0 to 30, specifically 1 to 25 and more specifically 3 to 20, with the proviso that n+p is less than or equal to 30, specifically less than 25 and more specifically less than 20; R 27 has the same meaning as indicated in the aforementioned formula (II), and R 29 represents a straight-chain or branched alkyl group containing 7 to 22 and preferably 12 to 20 carbon atoms.

[0086] In formula (III), the cation X may more particularly represent sodium or ammonium. Mention may be made in particular of: Uncrosslinked polymer, wherein p=0, n=7 or 25, R 27 represents methyl and R 29 represents a mixture of C12-C14 alkyl or C16-C18 alkyl, and Cross-linked polymer, wherein p=0, n=8 or 25, R 27 represents methyl and R 29 Represents a mixture of C16-C18 alkyl groups.

[0087] These polymers are described and synthesized in document EP 1 069 142 .

[0088] These particular amphiphilic polymers can be obtained according to standard free radical polymerization methods in the presence of one or more initiators, such as azobisisobutyronitrile (AIBN), azobis(dimethylvaleronitrile), 2,2-azobis[2-amidinopropane] hydrochloride (ABAH), organic peroxides such as dilauroyl peroxide, benzoyl peroxide, tert-butyl hydroperoxide, etc., inorganic peroxide compounds such as potassium persulfate or ammonium persulfate, or H2O2 (optionally in the presence of a reducing agent).

[0089] These amphiphilic polymers are obtainable by free-radical polymerization in a tert-butanol medium in which they are precipitated.

[0090] By using precipitation polymerization in tert-butanol, it is possible to obtain a size distribution of the polymer particles which is particularly advantageous for its use.

[0091] The reaction can be carried out at a temperature between 0°C and 150°C and preferably between 10°C and 100°C, at atmospheric pressure or under reduced pressure.

[0092] The reaction can also be carried out under an inert atmosphere, and preferably under nitrogen.

[0093] The polymers according to the invention may be partially or completely neutralized with inorganic or organic bases such as those mentioned above.

[0094] The molar percentage concentration of units of formula (III) and (IV) in the amphiphilic polymers according to the invention can vary depending on the desired cosmetic application, the nature of the emulsion (oil-in-water or water-in-oil emulsion) and the desired rheological properties of the formulation.

[0095] It may range between 0.1 mol % and 99.9 mol %.

[0096] The molar proportion of units of formula (IV) in the amphiphilic polymer according to the invention may preferably range from 0.1% to 50%, more particularly from 1% to 25% and even more particularly from 3% to 10%.

[0097] The molar proportion of units of formula (IV) in the amphiphilic polymer according to the invention may preferably range from 50.1% to 99.9%, more particularly from 60% to 95% and even more particularly from 65% to 90%.

[0098] The distribution of the monomers in the polymers of the invention may be, for example, alternating, block (including multiblock) or random.

[0099] As a guide, and this is not limiting, the following commercial references may be mentioned: HMS and HMB, these two reference names refer to cross-linked polymers.

[0100] HMS is crosslinked with trimethylolpropane triacrylate (TMPTA) / Cetearyl Methacrylate Copolymer 80 / 20 Ethoxylated (25EO) or Ammonium Acryloyldimethyltaurate / Stearate-25 Methacrylate Crosspolymer as the INCI name.

[0101] According to the INCI name, HMB is ammonium acryloyldimethyltaurate / beheneth-25 methacrylate crosspolymer.

[0102] As hydrophobic AMPS copolymers it is also possible to use uncrosslinked Copolymer( LNC or SNC), which are also effective in stabilizing emulsions.

[0103] According to the INCI name, LNC is ammonium acryloyldimethyltaurate / laureth-7 methacrylate copolymer.

[0104] According to the INCI name, SNC is ammonium acryloyldimethyltaurate / steareth-8 methacrylate copolymer.

[0105] Among the acrylic polymers that can be combined with the combination according to the invention, mention may also be made of neutralized crosslinked acrylic homopolymers or copolymers.

[0106] The preferred hydrophilic gelling agent of the present invention is ammonium polyacryloyldimethyltaurate, also known by the trade name Hostacerin It is known and commercially available from the supplier Clariant. It is also described as polyacrylamidomethylpropanesulfonic acid partially neutralized with ammonia and highly crosslinked

[0107] Other preferred hydrophilic gelling agents of the present invention are copolymers of AMPS and polyoxyethylene alkyl methacrylate (optionally crosslinked), and mixtures thereof, such as ammonium acryloyldimethyltaurate / steareth-25 methacrylate crosspolymer, available under the trade name Aristoflex HMS; ammonium acryloyldimethyltaurate / steareth-8 methacrylate crosspolymer, available under the trade name Aristoflex SNC; and ammonium acryloyldimethyltaurate / VP copolymer, available under the trade name Aristoflex AVC, Aristoflex JQD, Hostacerin SAF, all commercially available from the supplier Clariant.

[0108] According to a preferred embodiment, the cosmetic composition comprises at least one crosslinked and neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymer and at least one optionally crosslinked copolymer of AMPS and polyoxyethylene alkyl methacrylate.

[0109] According to a more preferred embodiment, the cosmetic composition comprises ammonium polyacryloyldimethyltaurate and ammonium acryloyldimethyltaurate / steareth-25 methacrylate crosspolymer.

[0110] Advantageously, at least one acrylic polymer may be present in the cosmetic composition according to the invention in an amount ranging from 0.1% to 5% by weight, for example from 0.15% to 3% by weight or from 0.2% to about 2% by weight relative to the total weight of the cosmetic composition.

[0111] Cosmetic Active Ingredients As cosmetic compositions, the compositions according to the invention comprise at least one cosmetically active ingredient.

[0112] As examples of cosmetic active ingredients, mention may be made of vitamins (e.g., ascorbyl glucoside, tocopheryl acetate), saccharomyces / xylinum / black tea fermentation product, Vaccinium umbelliferum fruit extract, Saccharum officinarum extract, Citrus aurantium dulcis fruit extract, Citrus limon fruit extract, Acer saccharum extract, glycolic acid, hydroxypropyl tetrahydropyrantriol, caffeine, Secale cereale seed extract, sodium hyaluronate, betaine, dipeptide diaminobutyroylbenzylamide diacetate, and the like.

[0113] According to one embodiment, the cosmetic active ingredient is present in an amount ranging from 0.1% to 15% by weight, preferably from 1% to 12% by weight, more preferably from 3% to 10% by weight relative to the total weight of the composition.

[0114] Water Phase As oil-in-water emulsions, the cosmetic compositions of the present invention comprise a continuous aqueous phase.

[0115] The aqueous phase is preferably present in an amount ranging from 10% to 99% by weight, more preferably from 20% to 90% by weight, and even more preferably from 50% to 85% by weight of the total weight of the composition.

[0116] Water is preferably present in the composition according to the invention in an amount ranging from 1% to 80% by weight, preferably from 5% to 77% by weight, more preferably from 10% to 75% by weight, relative to the total weight of the composition.

[0117] The continuous aqueous phase may comprise water, at least one water-miscible organic solvent, or a mixture thereof.

[0118] Preferably, the continuous hydrophilic phase comprises at least one organic solvent that is miscible with water (at room temperature 25° C.), for example, a monohydric alcohol having 2 to 6 carbon atoms, such as ethanol, isopropanol; a polyhydric alcohol having 2 to 20 carbon atoms, preferably 2 to 10 carbon atoms, and preferably 2 to 6 carbon atoms, such as glycerol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, caprylyl glycol, dipropylene glycol, diethylene glycol; glycol ethers (especially having 3 to 16 carbon atoms), such as monopropylene glycol (C1-C4) alkyl ether, dipropylene glycol (C1-C4) alkyl ether or tripropylene glycol (C1-C4) alkyl ether, monoethylene glycol (C1-C4) alkyl ether, diethylene glycol (C1-C4) alkyl ether or triethylene glycol (C1-C4) alkyl ether, and mixtures thereof.

[0119] Preferably, the continuous hydrophilic phase of the composition of the present invention may comprise water and a polyol, preferably glycerol, propylene glycol, pentylene glycol.

[0120] Fat phase As an oil-in-water emulsion, the cosmetic composition according to the invention further comprises a dispersed fatty phase.

[0121] The fatty phase is present in an amount ranging from 1% to 50% by weight, preferably from 5% to 40% by weight, more preferably from 10% to 30% by weight relative to the total weight of the composition of the invention.

[0122] The fatty phase preferably comprises at least one oil. The oil may be volatile or non-volatile.

[0123] The term "oil" refers to a water-immiscible, non-aqueous compound that is liquid at room temperature (25°C) and atmospheric pressure (760 mmHg).

[0124] The term "non-volatile oil" means an oil which can remain on keratin materials for at least several hours at room temperature and atmospheric pressure and which has in particular a viscosity of less than 10 -3 A non-volatile oil may also be defined as an oil having a vapor pressure of 0.07 mg / cm2 (0.13 Pa) and having an evaporation rate such that, under the conditions defined above, the amount evaporated after 30 minutes is less than 0.07 mg / cm2. 2 .

[0125] These oils may be of vegetable, mineral or synthetic origin.

[0126] Preferably, the oil is selected from hydrocarbonized oil, silicone oil or fluorinated oil.

[0127] The term "hydrocarbon-based oil" or "hydrocarbonated oil" means an oil which is essentially formed or even consists of carbon and hydrogen atoms and optionally O and N atoms, and which does not contain heteroatoms Si and F. Such oils may contain alcohol, ester, ether, carboxylic acid, amine and / or amide groups.

[0128] The term "silicone oil" denotes an oil containing at least one silicon atom, especially containing Si-O groups.

[0129] The term "fluorinated oil" means an oil containing at least one fluorine atom.

[0130] Preferably, the oil is chosen from hydrocarbonized oils, preferably non-volatile.

[0131] The oil may be present, for example, in an amount ranging from 0.01% to 50% by weight, preferably from 0.05% to 30% by weight, more preferably from 0.1% to 10% by weight relative to the total weight of the composition.

[0132] Structuring reagents Advantageously, the cosmetic composition according to the invention comprises at least one structuring agent having a melting point less than or equal to 45°C.

[0133] Preferably, the structuring agent is selected from waxes, pasty compounds, and mixtures thereof.

[0134] The waxes considered in the context of the present invention are generally lipophilic compounds that are solid at room temperature (25°C), have a reversible solid / liquid state change, have a melting point greater than or equal to 30°C, preferably greater than or equal to 40°C, which melting point may be as high as 200°C and in particular as high as 120°C.

[0135] The term "pasty compound" within the meaning of the present invention is understood to mean a lipophilic fatty compound with a reversible solid / liquid state change, which exhibits an anisotropic crystal arrangement in the solid state and which comprises a liquid portion and a solid portion at a temperature of 23° C. In other words, the onset melting point of the pasty compound may be less than 23° C. The liquid portion of the pasty compound measured at 23° C. may represent 9% to 97% by weight of the pasty compound. At 23° C., this liquid portion preferably represents between 15% and 85% by weight, more preferably between 40% and 85% by weight of the pasty compound.

[0136] Within the meaning of the present invention, the melting point corresponds to the temperature of the maximum endothermic peak observed by thermal analysis (DSC) as described in standard ISO 11357-3: 1999. The melting point of the pasty compound can be measured using a differential scanning calorimeter (DSC), for example the calorimeter sold under the name "MDSC 2920" by TA Instruments.

[0137] The measurement procedure is as follows: A 5 mg sample of the pasty compound placed in a crucible is subjected to a first temperature increase in the range of -20°C to 100°C at a heating rate of 10°C / min, then cooled from 100°C to -20°C at a cooling rate of 10°C / min, and finally subjected to a second temperature increase in the range of -20°C to 100°C at a heating rate of 5°C / min. During the second temperature increase, the difference in energy absorbed by the empty crucible and the energy absorbed by the crucible containing the pasty compound sample is measured as a function of temperature. The melting point of the pasty compound is the temperature value corresponding to the peak of the curve representing the difference in absorbed energy as a function of temperature.

[0138] The liquid weight fraction of the pasty compound at 23°C is equal to the ratio of the melting enthalpy consumed at 23°C to the melting enthalpy of the pasty compound.

[0139] The enthalpy of fusion of a pasty compound is the enthalpy consumed by the pasty compound changing from the solid state to the liquid state. A pasty compound is "in the solid state" when all its substance is in solid crystalline form. A pasty compound is "in the liquid state" when all its substance is in liquid form.

[0140] The melting enthalpy of the pasty compound is equal to the area under the curve of the thermogram obtained according to standard ISO 11357-3:1999 using a differential scanning calorimeter (DSC), for example the calorimeter sold under the name MDSC 2920 by TA Instruments, with a temperature increase of 5° C. or 10° C. per minute.

[0141] The enthalpy of fusion of a pasty compound is the amount of energy necessary to change the pasty compound from a solid state to a liquid state. It is expressed in J / g.

[0142] The enthalpy of fusion consumed at 23°C is the amount of energy absorbed by the sample to change from the solid state to the state it exhibits at 23°C (consisting of a liquid portion and a solid portion).

[0143] The liquid fraction of the pasty compound measured at 32° C. preferably accounts for 30 to 100% by weight of the pasty compound, preferably accounts for 50 to 100% by weight of the pasty compound, more preferably accounts for 60 to 100% by weight of the pasty compound. When the liquid fraction of the pasty compound measured at 32° C. is equal to 100%, the end temperature of the melting range of the pasty compound is less than or equal to 32° C.

[0144] The liquid fraction of the pasty compound measured at 32° C. is equal to the ratio of the melting enthalpy consumed at 32° C. to the melting enthalpy of the pasty compound. The melting enthalpy consumed at 32° C. is calculated in the same way as the melting enthalpy consumed at 23° C.

[0145] Preferably, the structuring agent has a melting point between 38°C and 45°C.

[0146] Preferably it is a wax having a melting point between 38°C and 45°C, such as a linear ester.

[0147] Straight chain esters suitable for use in the present invention are preferably selected from stearyl stearate, myristyl myristate (INCI name: myristyl myristate), cetyl myristate, stearyl myristate, myristyl palmitate, stearyl palmitate, myristyl stearate, cetyl stearate, stearyl stearate and cetyl palmitate, and mixtures thereof.

[0148] Preferably, if present, the structuring agent is present in an amount ranging from 0.1 wt% to 5 wt%, preferably from 0.2 wt% to 2 wt%, more preferably from 0.5 wt% to 1.5 wt%, relative to the total weight of the composition.

[0149] Additional adjuvants or additives The cosmetic composition of the present invention may contain (and may also contain) conventional cosmetic adjuvants or additives, such as fragrances, chelating agents (such as disodium EDTA), preservatives (such as chlorphenesin and phenoxyethanol) and bactericides, additional surfactants, additional thickeners, fillers (such as stearalkonium hectorite), pH adjusters (such as citric acid or sodium hydroxide), and mixtures thereof.

[0150] According to a particularly preferred embodiment, the invention provides a cosmetic composition in the form of an oil-in-water emulsion comprising, relative to the total weight of the composition: (i) 0.5% to 3% by weight of at least one solid fatty alcohol having 14 to 22 carbon atoms; (ii) 0.3 wt % to 2 wt % of at least one amino acid surfactant selected from salts of glutamic acid; and (iii) 0.2 to 2 wt. % of at least one gelling agent selected from crosslinked and neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymers and optionally crosslinked copolymers of AMPS and polyoxyethylene alkyl methacrylate, and mixtures thereof.

[0151] Methods and uses According to a second aspect, the present invention relates to a non-therapeutic method for treating keratin materials comprising the step of applying to the keratin materials a composition according to the first aspect of the invention.

[0152] In particular, the keratin material may be skin.

[0153] Thus, in an embodiment of the second aspect, the present invention provides a non-therapeutic method for caring for the skin comprising applying to the skin a cosmetic composition according to the first aspect of the invention.

[0154] The following examples serve to illustrate the invention but are non-limiting in nature. Example

[0155] Example 1: Preparation of cosmetic composition Cosmetic compositions according to the comparative formulation (Comp.) and cosmetic compositions according to the inventive formulation (Inv.) were prepared according to the amounts given in the following table. The amounts are given in % by weight of the total composition.

[0156] The composition of Comparative Example 1 does not contain a solid fatty alcohol.

[0157] The composition of Comparative Example 2 does not include an acrylic polymer as a hydrophilic gelling agent.

[0158] Preparation method: Taking the composition of the inventive formula 1 as an example, the composition listed above is prepared as follows: 1. Homogenize the water phase and oil phase at about 75°C and 80°C respectively.

[0159] 2. Introduce the oil phase into the water phase and keep stirring at high temperature until emulsification is completed.

[0160] 3. Add polymers (AMPS, HMS, HA, xanthan gum) in sequence, keep stirring to make them evenly dispersed, and 4. Reduce temperature to add silicone and actives.

[0161] Example 2: Evaluation of cosmetic compositions Each of the cosmetic compositions prepared in Example 1 was measured for stability, texture, and skin feel.

[0162] stability The stability test of the cosmetic composition according to the inventive formulation and the cosmetic composition according to the comparative formulation at 40°C, 45°C and 65°C was conducted using a Binder oven (USA) by leaving the inventive formulation and the comparative formulation in the oven for 3 months.

[0163] A stability test for stability at 4° C. for two months was performed by leaving the cosmetic composition according to the inventive formulation and the cosmetic composition according to the comparative formulation in a refrigerator for 3 months using a Zhongke Meiling refrigerator (YC-260L, China).

[0164] Photostability testing was performed using ATLAC (AMTEK Measurement and Calibration Technologies) for 24 hours.

[0165] Finally, a freeze-thaw stability test was performed using a Binder oven (USA) for 10 cycles. In each cycle, the temperature was gradually changed from 20°C to -20°C within 24 hours.

[0166] texture The texture was evaluated based on the viscosity of the inventive formulation cosmetic composition and the comparative formulation composition, respectively.

[0167] The viscosity measurements are typically carried out at 25°C using a Rheomat RM180 viscometer equipped with an M3 spindle, at a shear rate of 200 rpm, after the spindle has been rotating in the composition for 10 minutes (after which time the viscosity and the spindle speed are observed to stabilize).

[0168] Skin sensation The cosmetic composition of the inventive formulation and the cosmetic composition of the comparative formulation were given to 5 consumers to apply on the skin, and the consumers gave ratings of easy spreading and fresh and moisturized feeling: 1: Very poor; 2: Almost no effect, unacceptable; 3: Acceptable; 4: Good effect; 5: Very good effect, very easy to pick up and spread, fresh on the skin.

[0169] The results of stability, viscosity, use and cosmetic properties of the composition according to the comparative formulation and the composition according to the inventive formulation are listed below.

[0170] The cosmetic composition of Inventive Formula 1 can be easily spread on the skin and provides a fresh and moisturized feeling to the skin. In addition, the cosmetic composition of Inventive Formula 1 is stable and exhibits a good texture.

Claims

1. A cosmetic composition in the form of an oil-in-water emulsion comprising: (i) at least one solid fatty alcohol; (ii) at least one amino acid surfactant; and (iii) at least one gelling agent selected from the group consisting of hydrophilic acrylic homopolymers and amphiphilic acrylic polymers.

2. The cosmetic composition of claim 1, wherein the solid fatty alcohol has the structure R—OH, wherein R represents a saturated or unsaturated straight chain hydrocarbon group, optionally substituted with one or more hydroxyl groups, containing 14 to 30 carbon atoms.

3. The cosmetic composition according to claim 1 or 2, wherein the solid fatty alcohol is present in an amount ranging from 0.1 wt% to 10 wt%, preferably from 0.2 wt% to 5 wt%, more preferably from 0.5 wt% to 3 wt%, relative to the total weight of the composition.

4. The cosmetic composition according to any one of claims 1 to 3, wherein the amino acid surfactant is selected from compounds of formula (A): Wherein in formula (A): Z represents a saturated or unsaturated straight or branched hydrocarbon group having 8 to 22 carbon atoms, X is hydrogen or methyl, n is 0 or 1, Y is selected from hydrogen, -CH3, -CH(CH3)2, -CH2CH(CH3)2, -CH(CH3)CH2CH3, -CH2C6H5, -CH2C2H4OH, -CH2OH, -CH(OH)CH3, -(CH2)4NH2, -(CH2)3NHC(NH)NH2, -CH2C(O)O - M + , -(CH2)2C(O)OH, -(CH2)2C(O)O - M + ,and M is a salt-forming cation such as sodium, potassium, ammonium or triethanolamine, Preferably in formula (A): Z represents a straight or branched chain C8 to C 22 an alkyl or alkenyl group, X is hydrogen or methyl, n is 0, Y is selected from hydrogen, -(CH2)2C(O)OH, -(CH2)2C(O)O - M + ,and M is a salt-forming cation such as sodium, potassium, ammonium or triethanolamine.

5. A cosmetic composition as claimed in claim 4, wherein the amino acid surfactant is selected from salts of alanine, arginine, aspartic acid, glutamic acid, glycine, isoleucine, leucine, lysine, phenylalanine, serine, tyrosine, valine, sarcosine, and any mixture thereof.

6. A cosmetic composition as claimed in any one of claims 1 to 5, wherein the amino acid surfactant is present in an amount ranging from 0.1 wt% to 5 wt%, preferably from 0.2 wt% to 3 wt%, more preferably from 0.3 wt% to 2 wt%, relative to the total weight of the composition.

7. A cosmetic composition as claimed in any one of claims 1 to 6, wherein the hydrophilic gelling agent is selected from AMPS homopolymers and amphiphilic acrylic polymers.

8. A cosmetic composition as claimed in any one of claims 1 to 6, wherein the hydrophilic gelling agent is selected from: i) an AMPS homopolymer comprising randomly distributed: a) 90% to 99.9% by weight of units of the following general formula (I): Where X + represents a proton, an alkali metal cation, an alkaline earth metal cation or an ammonium ion, not exceeding 10 mol % of the cation X + Probably proton H + ; b) 0.01% to 10% by weight of crosslinking units derived from at least one monomer containing at least two olefinic double bonds; the weight proportions are defined relative to the total weight of the polymer; and ii) Optionally crosslinked copolymers of AMPS and polyoxyethylene alkyl methacrylates.

9. The cosmetic composition as claimed in any one of claims 1 to 8, wherein the cosmetic composition comprises at least one crosslinked and neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymer and at least one optionally crosslinked copolymer of AMPS and polyoxyethylene alkyl methacrylate, in particular the cosmetic composition comprises ammonium polyacryloyldimethyltaurate and ammonium acryloyldimethyltaurate / steareth-25 methacrylate crosspolymer.

10. The cosmetic composition of any one of claims 1 to 9, wherein the acrylic polymer is present in an amount ranging from 0.1 wt% to 5 wt%, such as 0.15 wt% to 3 wt% or 0.2 wt% to about 2 wt%, relative to the total weight of the composition.

11. The cosmetic composition according to any one of claims 1 to 10, wherein The composition comprises an amount of aqueous phase ranging from 10% to 99% by weight, more preferably from 20% to 90% by weight and even more preferably from 50% to 85% by weight relative to the total weight of the composition.

12. The cosmetic composition according to any one of claims 1 to 11, wherein the composition comprises a fatty phase in an amount ranging from 1% to 50% by weight, preferably from 5% to 40% by weight, more preferably from 10% to 30% by weight, relative to the total weight of the composition.

13. A cosmetic composition in the form of an oil-in-water emulsion comprising, relative to the total weight of the composition: (i) 0.5% to 3% by weight of at least one solid fatty alcohol having 14 to 22 carbon atoms; (ii) 0.3 wt % to 2 wt % of at least one amino acid surfactant selected from salts of glutamic acid; and (iii) 0.2 to 2 wt. % of at least one hydrophilic gelling agent selected from crosslinked and neutralized 2-acrylamido-2-methylpropanesulfonic acid homopolymers and optionally crosslinked copolymers of AMPS and polyoxyethylene alkyl methacrylates, and mixtures thereof.

14. A non-therapeutic method for caring for the skin, comprising applying to the skin a cosmetic composition according to any one of claims 1 to 13.

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