FR2927804A1 - Cosmetic process, useful for care of skin and reducing the wrinkles, comprises application of composition comprising polyurethane and acrylic polymer interpenetrating polymer network type tightening polymer, and diol on the skin - Google Patents

Abstract

Cosmetic process comprises topical application (on the skin) of a cosmetic composition comprising polyurethane and acrylic polymer interpenetrating polymer network type tightening polymer in the form of aqueous dispersion of particles, and 2-8C diol comprising ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butylene glycol, diethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol, hexylene glycol, 1,2-hexanediol, 1,6-hexanediol and/or 1,2-octanediol, in a medium.

Description

The present invention relates to a cosmetic composition, in particular an anti-wrinkle composition, comprising, in a physiologically acceptable medium, a synthetic interpénétrés polymer interpenetrating polymer (IPN) in the form of an aqueous dispersion of particles, and a particular glycol.

It also relates to a cosmetic process for the care of wrinkled skin, intended to reduce wrinkles, comprising the application to said skin of a composition as defined above.

The general field of the invention is that of aging of the skin. During the aging process, an alteration of the structure and cutaneous functions appears. The main clinical signs observed are the appearance of wrinkles and fine lines related to sagging skin. Those skilled in the art know that such loosening can be corrected immediately by the application of a tightening agent on the skin. To date, the use of many tensor polymers to treat wrinkles is known to those skilled in the art. In particular, acrylic grafted silicone polymers or interpenetrating networks of polymers for smoothing wrinkles by tensor effect are described, in particular described in documents EP1038519 and FR2843025. Unfortunately, the compositions containing such tensors, although having a very satisfactory immediate tensor effect, have the major disadvantage of forming, after spreading on the skin, an inhomogeneous film having an unsightly whitish floury appearance due to the surface fragmentation of the film. form. These aesthetic defects can be avoided by adding an oil such as liquid petrolatum or hydrogenated polyisobutene to the composition, but the tensor effectiveness of the polymer is then greatly reduced.

Therefore, there is a need for cosmetic compositions having both excellent tensor efficiency and good spreading properties, forming a homogeneous film without a floury appearance on the surface. However, the Applicant has discovered that the addition of a particular glycol in compositions comprising a synthetic tensor polymer interpenetrating polymer network type of polyurethane and acrylic polymer allowed to retain the tensor properties of the polymer and to obtain a homogeneous film . EP-A-1752136 discloses an eyelash-applied mascara composition containing a polymer of interpenetrating polyurethane polymer and acrylic polymer network and moisturizing agents such as polyols. It is not suggested in this document to use this composition for treating the skin and in particular wrinkles.

The subject of the present invention is therefore a cosmetic process for the care of the skin, more particularly of the skin of the face, in particular of the wrinkled skin, comprising the topical application to the skin of a cosmetic composition comprising, in a physiologically-sensitive medium. acceptable, a synthetic polymer tensor network type interpenetrating polymers of polyurethane and acrylic polymer, in the form of an aqueous dispersion of particles, and a diol having 2 to 8 carbon atoms selected from ethylene glycol, 1 , 2-propylene glycol, 1,3-propylene glycol (or 1,3-propanediol), 1,3-butylene glycol, diethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol (or 1,2-pentanediol), hexylene glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol (or caprylyl glycol), and mixtures thereof.

The method according to the invention is in particular intended to smooth the human skin of the face and / or the body and / or to diminish or erase the signs of skin aging, in particular to reduce or eliminate the wrinkles and / or fine lines of the skin. skin.

The composition used for the process according to the invention comprises at least one synthetic tensor polymer of interpenetrating polymer network type (said IPN) of polyurethane and acrylic polymer, in the form of solid particles in aqueous dispersion.

Tensing polymer is understood to mean, according to the invention, a polymer that may have a tensor effect, that is to say that may tend the skin and by this effect of tension smooth the skin and reduce or even disappear immediately wrinkles and fine lines. More particularly, this term denotes a polymer producing at a concentration of 7% in water a shrinkage of more than 15% in the test described below.

The tensor effect can be characterized by an in vitro retraction test.

A homogeneous mixture of the tensor polymer in water is prepared beforehand at a concentration of 7% by weight. 30 μl of the homogeneous mixture is deposited on a rectangular test piece (10 × 40 mm, thus having an initial width Lo of 10 mm) of elastomer having an elastic modulus of 20 MPa and a thickness of 100 μm. After drying for 3 hours at 22 ° C. and 40% relative humidity RH, the elastomer specimen has a retracted width, noted L 3h, due to the tension exerted by the tensor polymer deposited.

The tensor effect (ET) of said polymer is then quantified as follows:

'AND' = (Lo û L3h / Lo) x100 in% with Lo = initial width 10mm and L3h = width after 3h of drying

For the purposes of the present invention, the term "interpenetrating polymer network" is intended to mean a mixture of two entangled polymers obtained by simultaneous polymerization and / or crosslinking of two types of monomer, the mixture obtained having a single glass transition temperature range.

A particularly preferred IPN is in the form of an aqueous dispersion of particles having a number average size ranging from 50 nm to 100 nm.

The IPN preferably has a glass transition temperature range (Tg) ranging from about 50 ° C to + 130 ° C, and preferably from 45 ° C to + 130 ° C. The Tg is measured in particular by scanning differential scanning calorimetry (DSC) using the device DSC 7 from Perkin Elmer, by preconditioning the polymer sample in a climatic chamber for 48 h at 25 ° C. 50% relative humidity, in an aluminum cup.

The measurement is carried out under nitrogen flushing, with a first heating ranging from -45 ° C. to + 140 ° C. at a rate of 10 ° C./min and a second heating ranging from -45 ° C. to + 230 ° C.

IPNs are described in the publication Solvent-free urethane-acrylic hybrid polymers for coating; E. Galgoci et al., JCT Coatings Tech, 2 (13), 28-36 (February 2005), as well as in US Pat. Nos. 4,64,4030 and 5173526. Advantageously, the interpenetrating polyurethane / acrylic polymer network can be prepared according to the method. described in US Patent 5173526.

This process comprises the following steps: (a) forming an isocyanate-terminated polyurethane prepolymer comprising water-dispersible carboxylic groups; (b) adding to the prepolymer a vinyl monomer mixture containing an ethylenically unsaturated monomer; (C) adding a tertiary amine to the prepolymer / vinyl monomer mixture; (d) dispersing the prepolymer / vinyl monomer mixture in water; (e) adding a free radical initiator (oil soluble) and a chain extender to the aqueous dispersion; and (f) polymerizing the vinyl monomers and completing the chain extension of the prepolymer by heating the aqueous dispersion.

The isocyanate-terminated polyurethane prepolymer can be obtained by reacting organic monomer containing at least two active hydrogen atoms per molecule, especially a diol and preferably a polyester polyol, with an excess of diisocyanate monomer. Preferably, the polyurethane prepolymer comprises unreacted carboxylic acid groups which are neutralized as tertiary amine salt after prepolymer formation and addition of the vinyl monomers, but prior to formation of the aqueous dispersion. The polyisocyanates used for the manufacture of the prepolymer can be aliphatic, cycloaliphatic, or aromatic. Examples of polyisocyanates include ethylene diisocyanate, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, cyclohexane-1,4-diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 1,4-phenylene, and the like. diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-5-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate, and mixtures thereof.

Polymeric polyols having a molecular weight ranging from 500 to 6000, preferably from 700 to 3000, which may be used for the preparation of the prepolymer, may be chosen from diols and triols or mixtures thereof. The polyols may be chosen in particular from polyesters, polyesteramides, polyethers, polythioethers, polycarbonates and polyacetals.

The polyester polyols may be selected from hydroxyl-terminated reaction products of polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, neopentyl glycol, 1,4-butanediol, furan dimethanol, cyclohexane, and the like. dimethanol, glycerol, trimethylolpropane, pentaerythritol, or mixtures thereof with polycarboxylic acids, in particular dicarboxylic acids or their ester form, such as succinic acid, glutaric acid, adipic acid or their methyl ester , phthalic anhydride or dimethyl terephthalate. It is also possible to use polyesters obtained by polymerization of lactones, such as caprolactone, and of polyol. The polyesteramides can be obtained using amino alcohols such as ethanolamine in the polyesterification mixture.

The polyether polyols which may be used include the products obtained by cyclic oxide polymerization, for example ethylene oxide, propylene oxide, tetrahydrofuran, or by addition of these cyclic oxides to polyfunctional initiators such as water, ethylene glycol, propylene glycol, diethylene glycol, cyclohexane dimethanol, glycerol, trimethylol propane, pentaerythritol, Bisphenol A. The polyethers may also be chosen from polyoxypropylene diols and triols, diols and triols. poly (oxyethylene-oxypropylene) obtained by simultaneous or sequential addition of propylene oxide and ethylene oxide with the appropriate initiators, and polytetramethylene glycol ethers obtained by polymerization of tetrahydrofuran.

The polythioether polyols may be chosen from the products obtained by condensation of thiodiglycol, either alone or with other glycols, dicarboxylic acids, formaldehyde, aminoalcohols or amino carboxylic acids. The polycarbonate polyols may be chosen from the reaction products. diols such as 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol or tetraethylene glycol with diaryl carbonates, such as diphenyl carbonate, or with phosgene. The polyacetal polyols may be selected from the reaction products of glycols such as diethylene glycol, triethylene glycol or hexanediol with formaldehyde.

The acid group-containing reactive isocyanate compounds which can be used in the preparation of the water-dispersible anionic prepolymers include diols and triols containing carboxylic acid groups, for example those of the formula (I) RC (CH 2 OH) 2 -COOH (I) wherein R is hydrogen or a C1-C10 alkyl group. The carboxylic group diol is preferably 2,2-dimethylolpropionic acid. The carboxylic group diol or triol may be incorporated into a polyester by reaction with a dicarboxylic acid before being introduced into the prepolymer. Acidic compounds are, for example, aminocarboxylic acids, for example lysine, cystine, 3,5-diaminobenzoic acid.

The water-dispersible anionic isocyanate-terminated polyurethane prepolymer can be prepared conventionally by reacting a stoichiometric excess of an organic polyisocyanate with a polymeric polyol and any other necessary isocyanate-reactive compound under anhydrous conditions at a temperature of from about 100.degree. temperature between 30 and 130 ° C until the reaction between the isocyanate groups and the hydroxyl groups is complete. The polyisocyanate and the active hydrogen-containing compounds are advantageously used so that the ratio of the number of isocyanate groups to the number of hydroxyl groups ranges from 1.1 / 1 to 6/1, preferably 1.5 / 1 to 3/1. It is possible to use a well known tin catalyst to assist in the formation of the prepolymer.

A mixture of water-dispersible polyurethane prepolymer containing carboxylic groups and the vinyl monomer is obtained by simply adding the vinyl monomer composition to the prepolymer. The vinyl monomer composition must contain at least one ethylenically initiated monomer.

The vinyl monomers which may be added to the prepolymer may be ethylenically unsaturated hydrocarbon monomers, ethylenically unsaturated esters, ethylenically unsaturated ethers, in particular (meth) acrylic acid esters, vinyl alcohol esters, styrene. It may especially be mentioned butadiene, isoprene, styrene, alkyl (meth) acrylates having a C1-C6 alkyl group, alkyl maleates having a C1-C6 alkyl group, vinyl acetate vinyl butyrate, acrylonitrile, vinylmethyl ether, vinylpropyl ether, vinylbutyl ether, vinyl chloride, vinylidene chloride. The unsaturated polyethylenic monomers may be chosen from butadiene, isoprene, allyl methacrylate, diesters of acrylic acid and of C2-C6 diols, such as butylene diacrylate and hexylene diacrylate, divinyl benzene, divinyl ether, divinyl sulfide, trimethylolpropane triacrylate. Advantageously, the vinyl monomer is methyl methacrylate.

Before dispersing the prepolymer / vinyl monomer mixture in water, a tertiary amine is added to the mixture in an amount sufficient to render the prepolymer dispersible in water, i.e., in an amount sufficient to neutralize the groups carboxylic. For example, the amine can be added in an amount ranging from 65 to 100% amine equivalent per carboxylic equivalent equivalent.

The tertiary amines that can be used are relatively volatile so that they are evaporated from the film after the filming.

There may be mentioned, for example, amines of formula R-N (R 1) (R 2) in which R, R 1 and R 2 independently represent a C 1 -C 4 alkyl or hydroxyalkyl group. For example, triethylamine, dimethylethanolamine, methyldiethanolamine and methyldiethylamine may be mentioned.

It is important that the tertiary amine be added to the prepolymer / monomer mixture before this mixture is dispersed in water to ensure compatibility of the organic and aqueous phases in the resulting dispersion. The prepolymer / vinyl monomer mixture can be dispersed in water using known technologies. Preferably, the mixture is added to the water with stirring, or the water can be poured into the mixture.

The chain extender containing the active hydrogen which reacts with the prepolymer may be a polyol, an amino alcohol, ammonia, a primary or secondary amine, and more particularly a diamine. Mention may be made, for example, of ethylenediamine, diethylene triamine, triethylene tetramine, propylene diamine, butylene diamine, hexamethylenediamine, cyclohexylenediamine, piperazine, 2-methylpiperazine, phenylenediamine and toluene diamine. , tris (2-aminoethyl) amine, 4,4'-methylenebis (2-chloraniline), 3,3'-dichloro-4,4'-diphenyl diamine, 2,6-diaminopyridine, 4,4 diaminodiphenyl methane, isophorone diamine.

The free radical initiator may be an azo initiator such as 2,2'-azobis (2,4-dimethylpentanenitrile) and 2,2'-azobis (2-methylpropanenitrile) [or AIBN].

The radical polymerization of the vinyl monomer mixture and the chain extender of the prepolymer is advantageously carried out at elevated temperature, for example between 50 ° C and 90 ° C, and preferably between 60 ° C and 80 ° C.

The amount of chain extender used is advantageously equivalent to the free isocyanate groups in the prepolymer, the ratio of the number of active hydrogens in the chain extender to the number of isocyanate groups in the prepolymer preferably ranging from 0.7 to 1. 3.

The polymerization of the vinyl monomers can be carried out according to two methods. According to a first method, the monomers are added and can swell the polyurethane prepolymer before the addition of the tertiary amine. The monomers are then polymerized using the free radical initiator. The proportion of the vinyl monomers can range from 25 to 75%, preferably from 40% to 60%, by weight of the total weight of solids of the aqueous dispersion. According to a second method of polymerization, a part of the vinyl monomers is added to the prepolymer, then neutralized with the tertiary amine and the prepolymer / vinyl monomer mixture is dispersed in water, followed by the polymerization during which the remainder of the monomers. Alternatively, the second monomer portion may be added to the vinyl prepolymer / monomer dispersion after addition of the amine and stir the mixture before the start of the polymerization.

The polymer dispersion can contain from 20 to 60% by weight of solids.

According to one preferred embodiment of the invention, the polyurethane present in the IPN is a polyester polyol / diol copolymer containing a carboxylic acid / diisocyanate / diamine group, as those described for example previously; the acrylic polymer present in the IPN is a polymethylmethacrylate.

The polyurethane / acrylic polymer IPN sold by the company AIR PRODUCTS under the trade name Hybridur 875 polymer dispersion (INCI name: POLYURETHANE-2 (and) POLYMETHYL METHACRYLATE), or even under the trade names Hybridur 870, is preferably used. Hybridur 880.

The IPN Hybridur 875 polymer dispersion alone has a tensor effect, measured according to the protocol described above, equal to + 70%.

The tensor polymer of interpenetrating polyurethane / acrylic polymer network type may be present in the composition used for the process according to the invention in a content ranging from 1 to 10% by weight of active material, relative to the total weight of the composition, preferably from 2% to 10% by weight of active material, and preferably from 2% to 8% by weight, and more preferably from 2% to 6% by weight. Active material means the polymer without the medium in which it is or in dispersion.

The composition used for the process according to the invention also comprises a diol having 2 to 8 carbon atoms, which may be chosen in particular from ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol (or 1,3-propanediol), 1,3-butylene glycol, diethylene glycol, 1,2-propanediol, 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol (or 1,2-pentanediol), hexylene glycol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol (or caprylyl glycol), and mixtures thereof. Preferably, the diol is selected from ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol (or 1,3-propanediol), 1,3-butylene glycol, 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol (or 1,2-pentanediol), hexylene glycol, and mixtures thereof. Advantageously, the diol is 1,3-butylene glycol. The diol described above is advantageously present in the composition used according to the invention in a content ranging from 0.5 to 5% by weight, relative to the total weight of the composition, preferably from 1% to 4% by weight of active ingredient, and preferably ranging from 1% to 3% by weight.

According to a preferred embodiment of the invention, the tensor polymer and the diol described above are present in the composition of the process according to the invention in a weight ratio polymer tensor / diol ranging from 1 to 3, and preferably ranging from 1.5 to 2.5, and preferably from 2 to 2.5.

The composition used for the process according to the invention is generally suitable for topical application to the skin and therefore generally comprises a physiologically acceptable medium, that is to say a medium compatible with the skin and / or its integuments. It is preferably a cosmetically acceptable medium, that is to say which has a pleasant color, odor and feel and that does not generate unacceptable discomfort (tingling, tightness, redness), likely to divert the consumer from using this composition. The composition of the process according to the invention may be in any of the galenical forms conventionally used for topical application and in particular in the form of dispersions of the lotion or aqueous gel type, emulsions of liquid or semiliquid consistency of the milk type, obtained by dispersion of a fatty phase in an aqueous phase (HIE) or conversely (W / O), or suspensions or emulsions of soft, semisolid or solid consistency of the cream or gel type, or multiple emulsions (W / O) / E or H / E / H), microemulsions, vesicular dispersions of ionic and / or nonionic type, or wax / aqueous phase dispersions. These compositions are prepared according to the usual methods. According to a preferred embodiment of the invention, the composition is in the form of an O / W emulsion or an aqueous gel.

This composition may also contain various adjuvants commonly used in the cosmetics field, such as emulsifiers such as fatty acid and polyethylene glycol esters, optionally polyoxyethylenated fatty acid and sorbitan esters, polyoxyethylenated fatty alcohols and esters. or fatty acid ethers and sugars such as sucrose or glucose; charges ; conservatives; sequestering agents; perfumes ; and thickeners and / or gelling agents, in particular polyacrylamides, acrylic homo- and copolymers and homo- and copolymers of acrylamido methylpropanesulphonic acid.

Of course, those skilled in the art will take care to choose this or these optional additional compounds and / or their amount in such a way that the anti-wrinkle properties of the composition according to the invention are not, or not substantially, impaired by the addition envisaged.

The composition of the process according to the invention may also contain anti-aging active ingredients with a complementary effect to the combination according to the invention, such as at least one compound chosen from desquamating agents, moisturizing agents and agents stimulating proliferation. and / or differentiation of keratinocytes, agents stimulating the synthesis of collagen and / or elastin or preventing their degradation, depigmenting agents, anti-glycation agents, agents stimulating the synthesis of glycosaminoglycans, dermo-decontracting agents or muscle relaxants, anti-oxidants and anti-radical agents, and mixtures thereof.

Examples of such active agents are: retinol and its derivatives such as retinyl palmitate; ascorbic acid and its derivatives such as magnesium ascorbyl phosphate and ascorbyl glucoside; tocopherol and its derivatives such as tocopheryl acetate; nicotinic acid and its precursors such as nicotinamide; ubiquinone; glutathione and its precursors such as L-2-oxothiazolidine-4-carboxylic acid; plant extracts including extracts of sea fennel and olive leaf; algae extracts and in particular laminaria; bacterial extracts; sapogenins such as diosgenin and extracts of Dioscorea, in particular Wild Yam, containing it; α-hydroxy acids; 13-hydroxyacids, such as salicylic acid and n-octanoyl-5-salicylic acid; oligopeptides and pseudodipeptides and their acylated derivatives, in particular {2- [acetyl- (3-trifluoromethyl-phenyl) -amino] -3-methyl-butyrylamino} acetic acid and lipopeptides marketed by SEDERMA under the trade names Matrixyl 500 and Matrixyl 3000; lycopene; adenosine, C-13-D-xylopyranoside-2-hydroxypropane.

In the process according to the invention, the application of the composition is carried out according to the usual techniques, for example by application (in particular of creams, gels, serums, lotions) to the skin to be treated, in particular the skin of the face and / or neck, especially the skin around the eye. In the context of this process, the composition may be, for example, a care composition or a makeup composition, in particular a foundation.

The composition used in the process according to the invention may also be impregnated on a wipe or on a patch to be applied to the skin.

The invention will now be described with reference to the following examples given for illustrative and non-limiting.

Comparative Examples 1 to 7:

Compositions 1 and 2 comprising a diol according to the invention (1,3-butylene glycol) and 3 to 7 outside the invention (containing dipropylene glycol or containing no glycol used according to the invention or containing glycerin are prepared. ) (contents expressed in grams): Example 1 2 3 4 5 6 7 Anti-aging ingredients 0.26 0.26 0.26 0.26 0.26 0.26 0.26 0.2 0.2 gum 0.2 0.2 0.2 0.2 0.2 xanthane Triethanolamine 0.2 0.2 0.2 0.2 0.2 0.2 0.2 copolymer 1 1 1 1 1 1 1 acrylamide / acrylamide Sodium 2-methyl propane sulphonate in 40% inverse emulsion in isoparaffin / water (Sepigel 305 from Seppic) copolymer methyl 0.2 0.2 0.2 0.2 0.2 0.2 0.2 vinyl ether / maleic anhydride crosslinked with 1,9-decadiene (STABILEZE QM from ISP) Aqueous dispersion 8.65 8.65 8, 65 8.65 8.65 8.65 8.65 to 40% by weight of particles in a network interpenetrating polyurethane and acrylic polymers (Hybridur 875 polymer dispersion from Air Products) 1,3-butylene glycol 1.5 3 Dipropylene Glycol 1.5 3 Glycerine 1.5 3 Caprylyl Glycol 0.4 0.4 0.4 0.4 0.4 0.4 0.4 Preservatives 0.6 0.6 0.6 0.6 0.6 0.6 0.6 Perfumes 0.21 0.21 0.21 0.21 0.21 0.21 0.21 Water qsp qsp qsp qsp qsp qsp qsp 100 100 100 100 100 100 100 Brilliance 41 36 37 28 15 16 Appearance white - - - + ++ ++ ++ farinous Tightening effect (%) 17.5 10 Each composition was spread on a contrast card (Prufkarte type 24/5 - 250 cm 2 marketed by Erichsen) to using a mechanical film gun and a thickness of 30 μm wet. The deposited composition was then left to dry overnight at a temperature of 37 ° C. and then the gloss of the deposit was measured using a BYK-Gardner micro-TRI-gloss glossmeter which expressed a value in terms of of brilliance. This measurement is made on the white part of the map for a specular angle of 60 °.

It is thus apparent from the above table that the compositions 1 and 2 used according to the invention have a higher gloss than that of the compositions 3 to 7 outside the invention. important compared to the composition B outside the invention. It is also observed by observation with the naked eye that the polymer Hybridur 875 associated with 1,3-propylene glycol (compositions 1 and 2) or dipropylene glycol but at 1, 5% (composition 3) forms a more homogeneous deposit, not having a whitish floury appearance on the surface (evaluation -), than those obtained with the compositions without these glycols (composition 5) or in the presence of glycerin (compositions 6 and 7) or in the presence of 3% of dipropylene glycol (composition 4) which have a white floury aspect (evaluation + and ++).

The tensor effect of the compositions of Examples 1, 3 and 5 was also measured according to the measurement method described previously in the description. Compared to the composition of Example 4 containing no diol or polyol, it was found that the composition of Example 3 containing 1.5% of dipropylene glycol has a lower tensor effect than that obtained for the composition 1 according to the invention containing 1.5% of 1,3-butylene glycol. Only the compositions 1 and 2 allow both to obtain a non-whitish non-floury deposit on the surface and having a higher tensor effect.

Furthermore, it has been observed that the compositions 1 and 2 used according to the invention after application to the wrinkled skin of the face have a good tensor effect.

Claims (3)

1. Cosmetic skin care process, comprising the topical application to the skin of a cosmetic composition comprising, in a physiologically acceptable medium, a tensor polymer of the interpenetrating polymer polyurethane and acrylic polymer type, aqueous dispersion form of particles; and a diol having 2 to 8 carbon atoms selected from ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butylene glycol, diethylene glycol, 1, 2- propanediol, 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol, hexylene glycol, 1,2-hexanediol, 1,6-hexanediol, 2-octanediol, and mixtures thereof. 2. Method according to the preceding claim, characterized in that the tensor polymer produced at a concentration of 7% in water a shrinkage of more than 15%. 3. Method according to any one of the preceding claims, characterized in that the interpenetrating polymer network tensor polymer comprises: a polyester polyol / diol copolymer polyurethane having a carboxylic acid / diisocyanate / diamine group; a polymethylmethacrylate. 6. Process according to the preceding claim, characterized in that the polyester polyol is chosen from the hydroxyl-terminated reaction products of polyhydric alcohols chosen from ethylene glycol, propylene glycol, diethylene glycol, neopentyl glycol, and the like. , 4-butanediol, furan dimethanol, cyclohexane dimethanol, glycerol, trimethylolpropane, pentaerythritol, or mixtures thereof, with polycarboxylic acids, chosen from succinic acid, glutaric acid, adipic acid or their ester methyl, phthalic anhydride, dimethyl terephthalate. 7. Process according to claim 3 or 4, characterized in that the carboxylic acid group diol is 2,2-dimethylolpropionic acid. 8. Process according to any one of Claims 3 to 5, characterized in that the diamine is chosen from ethylenediamine, diethylene triamine, triethylenetetramine, propylene diamine, butylene diamine, hexamethylenediamine and cyclohexylene diamine. piperazine, 2-methyl piperazine, phenylene diamine, toluene diamine, tris (2-aminoethyl) amine, 4,4'-methylenebis (2-chloroaniline), 3,3'-dichloro-4, 4'-diphenyl diamine, 2,6-diaminopyridine, 4,4'-diaminodiphenyl methane, isophorone diamine. 7. Process according to any one of the preceding claims, characterized in that the acrylic polymer of the interpenetrating polymer network is a polymethylmethacrylate. 8. Method according to any one of the preceding claims, characterized in that the tensor polymer interpenetrating polymer network type of polyurethane and acrylic polymer is present in the composition in a content ranging from 1 to 10% by weight of active ingredient , relative to the total weight of the composition. 9. Process according to any one of the preceding claims, characterized in that the diol is chosen from ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol and 1,3-butylene glycol. 1,4-butanediol, 1,2-butanediol, 2,3-butanediol, pentylene glycol, hexylene glycol, and mixtures thereof. 10. Process according to any one of the preceding claims, characterized in that the diol is butylene glycol. 11. Process according to any one of the preceding claims, characterized in that the diol is present in the composition in a content ranging from 5% to 5% by weight, relative to the total weight of the composition. 12. Method according to any one of the preceding claims, characterized in that the composition is in the form of an O / W emulsion or an aqueous gel. 13. Method according to any one of the preceding claims, characterized in that the composition is applied to a wrinkled skin. 14. Process according to any one of the preceding claims, characterized in that it is intended to attenuate wrinkles. 15 20 30