FR3004933A1 - COSMETIC COMPOSITION OF NAILS COATING - Google Patents

Abstract

The present invention relates to a coating assembly for keratin materials, in particular nails including cuticles, comprising: (i) a cosmetic composition of the sol / gel type for the makeup and / or care of keratin materials, in particular intended for coating the nails, comprising the product (s) resulting from the reaction of: at least one alkoxysilane compound A chosen from at least one monomer (ALK) triethoxysilane, at least one oligomer (ALK) triethoxysilane, (s) derivative (s), and their mixture, with ALK representing an alkyl group, linear or branched, unsubstituted, C1-C4, in particular C1-C2, preferably methyl, and - a quantity of water corresponding to a number of moles of water, determined according to the following equation: X = (Alkoxysilanes * nbAloxy groups) / nH2O With: nH2O = Number of moles of water, nAlcoxysilanes = Number of moles of alkoxysilane compounds, nbAlkoxy groups = Weighted average of the number of g alkoxysilane rupees per alkoxysilane compound, and X is a number greater than or equal to 2, and (ii) a felt tip adapted to apply said composition made of porous plastic material (s). The present invention also relates to a process for coating keratin materials.

Description

The subject of the present invention is a coating assembly for keratin materials, in particular nails including cuticles, comprising a cosmetic composition for coating keratinous substances, in particular nails including cuticles, and a felt tip adapted to apply said composition. Such a composition is obtained by sol / gel reaction by mixing at least one alkoxysilane and at least a specific amount of water, determined as a function of the number of moles of alkoxy groups in the mixture. The present invention relates more particularly to nail compositions, in particular long-lasting effect or remanent. Compositions of this type are in particular described in application FR 2 811 549. Compositions have already been described comprising gels based on alkoxysilanes are also described in application FR 2 913 887. The use of sol / gel techniques for the purpose of preparing cosmetic compositions is also known. It has never been demonstrated in all these documents that the amount of water has an influence on the properties of the composition before formation of the gel, in particular, in terms of stability. There is therefore a need to provide compositions employing sol / gel reactions based on alkoxysilane compounds having both good reactivity and stability properties prior to their application to keratin materials. Indeed, the layer of the composition deposited on the keratinous materials can, if the reaction is slow and does not dry quickly, be sticky after its application and / or be degraded by contact with foreign bodies with which it can be brought into contact, such as a glass, a cigarette, a garment or skin, which will be detrimental to the users. The inventors have found that such advantages can be obtained by the use of particular alkoxysilane monomers or oligomers, in the presence of a specific amount of water, in particular based on the number of moles of alkoxy groups derived from the monomers or alkoxysilane oligomers. They have thus been able to observe, as reported in the examples below, that beyond a certain quantity of water in the cosmetic composition, always in this ratio relative to the number of moles of alkoxy groups derived from the monomers or alkoxysilane oligomers, the desired properties in terms of stability over time were not ensured satisfactorily. There is still a need to provide compositions employing sol / gel reactions based on alkoxysilane compounds capable of forming deposits, coatings or even films, having a long life. Another object of the invention is to obtain a rapid drying of the film or coating obtained. Another problem specifically related to the application of colored nail polish is that some parts of the nails may have after makeup removal residual stains. More generally it may be difficult to completely eliminate the coloring of nails made with a conventional colored nail polish, hence the need to find a solution that alleviates or remedies this problem. Finally, water and detergent wash remanence properties are sought. Another object of the invention is to obtain a composition capable of providing a fresh effect on the nails, often synonymous for the users of a moisturizing effect and a moisturizing effect of the cuticles. Moreover, the application of such a composition can not be satisfactorily provided by any application device. An object of the invention is therefore to apply this composition by means of a device configured to ensure a uniform application and / or fine. An object of the invention is also to apply this composition by means of a reusable device over applications without significant loss of application performance, in particular from a uniformity of application and / or smoothness point of view. of the application.

Thus, the subject of the present invention is a coating assembly for keratin materials, in particular nails including cuticles, comprising: (i) a cosmetic composition of the sol / gel type for coating keratin materials, in particular intended to coat the nails, in particular intended for make-up and / or care, comprising the product (s) resulting from the reaction of: a) at least one alkoxysilane compound A chosen from at least one monomer (ALK) triethoxysilane, at least one triethoxysilane (ALK) oligomer, their derivative (s), and their mixture, with ALK representing a linear or branched, unsubstituted, C 1 -C 4, in particular C 1 -C 2, alkyl group, preferably a Methyl, b) optionally at least one alkoxysilane compound B selected from at least one alkoxysilane monomer, at least one alkoxysilane oligomer, their derivative (s), and their mixture, of formula (I): R1xSi (OR2) (4_x) (I) Formula (I) wherein: R1 is independently comprising a hydrocarbon group, in particular a C1-C20, preferably C1-C8, hydrocarbon-based chain interrupted by at least one, and / or carrier of at least one heteroatom, in particular an oxygen atom, or an oxo group or combinations thereof, in particular carboxyl, carbonyl, an ether group, an ester group such as carbonyloxy, in particular interrupted by an ester group such as carbonyl oxy, in particular at a silicon atom R2 representing, independently , a hydrogen atom, or a C1-C10 hydrocarbon chain, preferably a C2 hydrocarbon chain, x represents 1, 2 or 3, preferably is equal to 1, c) optionally at least one alkoxysilane compound C selected from at least one alkoxysilane monomer, at least one alkoxysilane oligomer, their derivative (s), and their mixture, of formula (II): RtxSi (OR2 ') (4_x) (II) Formula (II) wherein: R1 'independently represents a hydrocarbon group e, in particular a hydrocarbon chain, C1-C20, preferably C1-C8, interrupted by at least one, and / or carrier of at least one amino group (-N (R) - or -NRR 'with R, R ', which may be identical or different, representing a hydrogen atom or a C 1 -C 8 alkyl group, in particular carrying an amino group such as NH 2, preferably terminated by an NH 2 group, R 2' representing, independently, a hydrogen atom, or a C1-C10 hydrocarbon chain, preferably a C2 hydrocarbon chain, x represents 1, 2, or 3, preferably is equal to 1, and, d) a quantity of water corresponding to a number of moles of water, determined according to the following equation: X = (nAlcoxysilanes * nbAloxy groups) nH20 With: r1E-120 = Number of moles of water, nAlcoxysilanes = Number of moles of alkoxysilane compounds, nbAlkoxy groups = Average weighted number of alkoxysilane groups per alkoxysilane compound, and X is a number greater than or equal to 2, and, (ii) a felt tip adapted to apply said composition made of porous plastic material (s). According to a preferred embodiment, the felt tip is made of porous plastic material (s), more preferably of porous thermoplastic material (s), preferably having pore sizes between 7 and 250 μm. According to a preferred embodiment, the alkoxysilane compound (s) is (are) chosen from at least one monomer of MTES (methyltriethoxysilane), at least one oligomer of MTES, their derivative (s). (s), and their mixture. Selection of such a quantity of water allows only a portion of the alkoxysilane monomers or oligomers of the composition to be hydrolyzed. Thus, the gelation is delayed until the moment of application to the keratin materials and the stability in time of the composition is thus improved. The number of moles of silicon of the alkoxysilane monomers and oligomers is to be taken into consideration from all of said alkoxysilane monomers and oligomers, ie corresponding to (a) defined above or any other additional alkoxysilane monomer or oligomer. In addition, such compositions are particularly useful for the purpose of strengthening the nails, and / or moisturizing, and / or reducing or even preventing the appearance of stains on the nails when using colored nail polish and / or or facilitate its elimination. The hydration of the nails and in particular of the cuticles is in particular obtained by the oily texture of the compositions in accordance with the invention. The term "carrier" substituted and / or terminated.

"Independently" means identical or different. The term "weighted average" means: the number of alkoxy groups per molecule of alkoxysilane, when only one alkoxysilane compound is present in the composition, the weighted average by the molar ratio of the number of alkoxy groups per molecule of alkoxysilane when several alkoxysilane compounds (A1, A2, ...) are present in the composition. A cosmetic composition according to the present invention is liquid. In addition, such a composition has stability properties before application, that is to say an ability to remain in liquid form, that is to say not to gel, before application to the keratin materials, especially after a week of storage at 60 ° C. By "liquid composition" is meant in the context of the present invention, a composition having a particular viscosity at room temperature, namely at 20 ° C.

More specifically, a liquid composition has, at 20 ° C, a viscosity ranging from 0.001 to 20 Pa / s, preferably from 0.01 to 10 Pa / s, and still more preferably from 0.1 to 2 Pa / s. s. The viscosity measurement can be carried out at 20 ° C., using a Rheomat RM 180 viscometer equipped with a No.4 mobile, the measurement being carried out after a rotation of the module in the composition for 10 minutes (time after which stabilization of viscosity and rotational speed are observed), at a shear rate of 200 s-1. In the context of the present invention, the term "alkoxysilane" is intended to mean a compound comprising at least one silicon atom bearing at least one alkoxyl group. "Between" means inclusive between. By "derivative (s)" of the alkoxysilane compounds A, B or C is meant in particular their salt (s), their solvate (s), such as their hydrate (s), their s) optical isomer (s), their geometric isomer (s), their enantiomer (s). As regards the derivatives of the carboxyl groups in particular, it is possible, for example, to include alkali metal or alkaline earth metal carboxylates such as sodium and potassium carboxylate and carboxylates of organic salts such as ammonium carboxylate. In this application and unless expressly stated: A "hydrocarbon chain" is "(poly) unsaturated" when it comprises one or more double bonds and / or one or more triple bonds, conjugated or otherwise; By "(hetero) ring" is meant a cyclic or heterocyclic group; "Cyclic" means a "cycloalkyl" group, i.e. non-aromatic, mono or polycyclic, condensed or not, containing from 5 to 10 carbon atoms, which may comprise from one to more unsaturations such as cyclohexyl or cyclopentyl; By "heterocyclic" is meant a non-aromatic mono or polycyclic group, condensed or not, containing from 5 to 10 members, having 1 to 6 heteroatoms selected from nitrogen, oxygen, sulfur and selenium morpholinyl, thiomoropholinyl, piperidinyl, piperazinyl, pyrrolidinyl, tetrahydrofuranyl, tetrahydrothophenyl, azepanyl, thioazepanyl; preferentially pirrolidinyl and morpholino; The cyclic or heterocyclic portion of a nonaromatic group may be substituted by at least one substituent carried by a carbon atom selected from: - hydroxyl, - (C 1 -C 4) alkoxy, (C 2 -C 4) (poly) hydroxyalkoxy, - alkylcarbonylamino ((RC (O) -NR'-) in which the group R 'is a hydrogen atom, a C1-C4 alkyl group optionally carrying at least one hydroxyl group and the R group is a lower alkyl group; C1-C2, amino substituted with two identical or different C1-C4 alkyl groups optionally bearing at least one hydroxyl group, said alkyl groups being able to form, with the nitrogen atom to which they are attached, a heterocycle comprising from 5 to 7-membered, optionally substituted saturated or unsaturated compound optionally comprising at least one other non-nitrogen or non-nitrogen heteroatom; -alkylcarbonyloxy ((RC (O) -O-) in which the R group is a C1-C4 alkyl, amino group; substituted by two identical alkyl groups or C1-C4 elements optionally carrying at least one hydroxyl group, said alkyl groups being able to form, with the nitrogen atom to which they are attached, an optionally substituted 5 to 7-membered saturated or unsaturated heterocycle optionally comprising at least one another heteroatom different or different from nitrogen; - alkoxycarbonyl ((RO-C (O) -) wherein the group R is a C 1 -C 4 alkyl group, amino substituted with two identical or different C 1 -C 4 alkyl groups optionally carrying at least one hydroxyl group, said alkyl groups which can form, with the nitrogen atom to which they are attached, an optionally substituted 5 to 7-membered saturated or unsaturated heterocycle optionally comprising at least one other heteroatom which is different from or different from nitrogen; "aryl" means an aryl or heteroaryl group; "aryl" means a mono or polycyclic group, condensed or not, comprising 5 to 10 carbon atoms or chains, and at least one ring is aromatic; aryl is phenyl, biphenyl, naphthyl, indenyl, anthracenyl, or tetrahydronaphthyl, and more preferably phenyl; "heteroaryl" represents a mono or polycyclic group, condensed or not, comprising having from 5 to 10 carbon atoms or rings, comprising from 1 to 2 heteroatoms selected from nitrogen, oxygen, sulfur and selenium, and wherein at least one ring is aromatic; preferably heteroaryl is selected from acridinyl, benzimidazolyl, benzobistriazolyl, benzopyrazolyl, benzopyridazinyle, benzoquinolyl, benzothiazolyl, benzotriazolyl, benzoxazolyl, pyridinyl, tetrazolyl, dihydrothiazolyl, imidazopyridinyl, imidazolyl, indolyl, isoquinolyl, naphthoimidazolyle, naphthooxazolyle, naphthopyrazolyle, oxadiazolyl, oxazolyl, oxazolopyridyl phenazinyl, phenoxazolyl, pyrazinyl, pyrazolyl, pyrilyl, pyrazoyltriazyl, pyridyl, pyridinoimidazolyl, pyrrolyl, quinolyl, tetrazolyl, thiadiazolyl, thiazolyl, thiazolopyridinyl, thiazoylimidazolyl, thiopyryl, triazolyl, xanthyl and its ammonium salt; The "aryl" or "heteroaryl" groups or the aryl or heteroaryl part of a group may be substituted by at least one substituent carried by a carbon atom, chosen from: a C1-C4 alkyl group, preferably a C1-C4 alkyl group; C2, optionally substituted with one or more groups selected from hydroxyl, C1-C2alkoxy, (poly) -hydroxyalkoxy C2-C4, acylamino, amino substituted by two identical or different C1-C4 alkyl groups, optionally carrying at least one hydroxyl group, or both groups being able to form, with the nitrogen atom to which they are attached, a 5- to 7-membered, preferably 5 or 6-membered, optionally saturated or unsaturated heterocyclic ring; optionally comprising another heteroatom identical to or different from nitrogen - a halogen atom such as chlorine, fluorine or bromine; a hydroxyl group; a C1-C2 alkoxy group; a C2-C4 (poly) -hydroxyalkoxy group; - an am ino group; nitro; a 5- or 6-membered heterocycloalkyl group; a 5- or 6-membered optionally cationic heteroaryl group, preferentially imidazolium, and optionally substituted with a (C 1 -C 4) alkyl group, preferably methyl; an amino group substituted with one or two identical or different C 1 -C 6 alkyl groups optionally carrying at least: i) a hydroxyl group, ii) an amino group optionally substituted with one or two C 1 -C 3 alkyl groups optionally substituted, said alkyl groups being able to form, with the nitrogen atom to which they are attached, an optionally substituted 5 to 7-membered heterocyclic ring, saturated or unsaturated, optionally comprising at least one other heteroatom different from or different from nitrogen; an acylamino group (-N (R) -C (O) R ') in which the R group is a hydrogen atom, a C 1 -C 4 alkyl group optionally carrying at least one hydroxyl group and the R' group is a C1-C2 alkyl group; a carbamoyl group ((R) 2 N-C (O) -) in which the groups R, which may be identical or different, represent a hydrogen atom or a C 1 -C 4 alkyl group optionally bearing at least one hydroxyl group; a carboxylic acid or ester group, (-O-C (O) R ') or (-C (O) OR'), in which the R 'group is a hydrogen atom or a C 1 -C 4 alkyl group; optionally carrying at least one hydroxyl group and the group R 'is a C1-C2 alkyl group; the carboxylic group which may be in acid or salified form (preferably with an alkali metal or an ammonium, substituted or unsubstituted); an alkylsulphonylamino group (R'S (O) 2 -N (R) -) in which the R group represents a hydrogen atom, a C1-C4 alkyl group optionally bearing at least one hydroxyl group and the group R 'represents a C1-C4 alkyl group or a phenyl group; an aminosulfonyl group ((R) 2 N -S (O) 2 -) in which the groups R, which may be identical or different, represent a hydrogen atom or a C 1 -C 4 alkyl group optionally carrying at least one hydroxyl group a cyano group (CN); e (CF3); a (poly) haloalkyl group, preferentially trifluoromethyl A cyclic, heterocyclic group, or a non-aromatic part of an aryl or heteroaryl group, may also be substituted with one or more oxo groups; An "alkyl" group is a linear or branched hydrocarbon group consisting of a number of carbons, for example C 1 -C 10, preferably C 1 -C 5; especially C1-C4 such as methyl or ethyl; An "alkenyl" group is a linear or branched hydrocarbon group constituted by a number of carbons, comprising one or more double bonds, conjugated or otherwise, for example C 2 -C 10, in particular C 4 -C 8 comprising a two or three double bonds, preferentially a single double bond; By "(optionally) substituted", assigned to the group concerned is meant that said group concerned (may be) is substituted by one or more group (s) selected from i) hydroxyl groups, ii) C 1 -C 4 alkoxy iii) acylamino, iv) amino optionally substituted by one or two identical or different C1-C4 alkyl radicals, said alkyl radicals being able to form, with the nitrogen atom which carries them, a heterocycle comprising from 5 to 7 members, optionally comprising another heteroatom other than nitrogen, y) phenyl, vi) (C 1 -C 6) alkoxycarbonyl, vii) (C 1 -C 6) alkylcarbonyloxy, viii) HC (O) -O-; By "(poly) hydroxy" is meant one or more group (s) -OH, knowing that when the (the) hydroxy is (are) directly connected to (hetero) aryl it may be in salified form depending on the pH of the composition, preferably by alkali, alkaline earth or organic metals such as cosmetically acceptable ammoniums such as sodium, potassium; By "carboxy" is meant i) a -C (O) -OH group, as well as its salts according to the pH of the composition, for example salified by alkali metals, alkaline earth metals, and organic salts such as ammoniums, cosmetically acceptable, such as sodium, potassium, ii) its thiolated derivatives such as -C (S) -OH, iii) its (thio) ester derivatives, and iv) its (thio) amide derivatives; By "alkoxy" is meant an alkyloxy or alkyloxy group for which the alkyl radical is a hydrocarbon radical, linear or branched, C1-C16 preferably C1-C8; especially C1-C4 such as methoxy or ethoxy, and when the alkoxy group is optionally substituted, it implies that the alkyl group is optionally substituted as defined above; A "(poly) hydroxyalkyl" group is an "alkyl" group as defined above in which one or more hydrogen atoms are substituted or replaced by one or more hydroxyl group (s), for example CH2C1-1201-1. ; A "(poly) hydroxyalkoxy" group is an "alkoxy" or "alkoxy" group as defined above in which one or more hydrogen atoms are substituted or replaced by one or more hydroxy group (s). -OCH2CH2OH; A second object of the present invention relates to a process for coating keratin materials and in particular nails comprising at least one step consisting in applying to said keratinous materials at least one layer of a cosmetic composition as defined above, preferably free of of dyestuff (s), and preferably a step of at least partially removing said at least one layer of applied cosmetic composition. This process advantageously also comprises at least one step of applying to said keratin materials at least one layer of a colored makeup composition, in particular a colored nail polish. This process advantageously also comprises a step of applying an acid or basic catalysis solution preceding or following the step of applying said at least one layer of a cosmetic composition as defined above. This method advantageously further comprises at least one step of at least partially removing said at least one layer of applied cosmetic composition. Such a method may further comprise at least one subsequent step of applying to said keratin materials at least one layer of a colored makeup composition, in particular a colored nail polish.

A third subject of the present invention relates to a kit for coating keratin materials, in particular nails, comprising on the one hand a first composition as defined above, preferably free of dyestuff (s), and on the other hand second composition, preferably comprising at least one dyestuff. A fourth subject of the present invention relates to a kit for coating keratin materials, in particular nails, comprising on the one hand a first composition comprising at least one alkoxysilane compound A, preferably free of dyestuff (s), and on the other hand a second composition, comprising at least one alkoxysilane compound B and / or at least one alkoxysilane compound C. A fifth subject of the present invention relates to a kit for coating keratin materials, in particular nails comprising on the one hand a first composition comprising at least one composition as defined above, preferably free of dyestuff (s), and secondly a second composition, comprising at least one alkaline agent, preferably chosen from at least one alkoxysilane compound C, at least one glycinate and derivative compound, at least one (bi) carbonate compound and derivatives, and their mixture, said second composition n being implemented before and / or after the application of said first composition, preferably before. The present invention relates to an application assembly comprising: - a particular cosmetic composition, and - a felt tip adapted to apply said composition made of porous plastic material (s).

Such an assembly can serve not only for the application but also for the packaging of a cosmetic composition according to the invention.

Felt tip A felt tip according to the invention is made of one or more porous plastic material (s), in particular one or more porous thermoplastic material (s), preferably of a porous thermoplastic material.

This porous material preferably has pore sizes between 7 and 250 μm. The thermoplastic material is advantageously made of a material chosen from polyethylene (PE), polypropylene (PP), ethyl vinyl acetate (EVA), polyvinylidene fluoride (PVDF), preferably from polyethylene (PE), polypropylene, more preferably is polyethylene. Such felt tips porous thermoplastic material are sold for example by the company Porex® under the trade name of Porex® Nibs.

In the context of the present invention, the term "felt tip" is distinct from a ball device, or any device based on bristles, or synthetic or natural fibers.

COSMETIC COMPOSITION A composition according to the present invention comprises: at least one alkoxysilane compound A, optionally at least one particular alkoxysilane compound B, optionally at least one particular alkoxysilane compound C, and a specific amount of water. Water According to a particular embodiment, the quantity of water present in the reaction medium for obtaining the product included in the composition according to the present invention corresponds to a number of moles of water, determined according to the following equation: X = (Alkoxysilanes * nbAloxy groups) nH20 with: nE-120 = Number of moles of water, nAlcoxysilanes = Number of moles of alkoxysilane compounds, nbAlkoxy groups = Weighted average of the number of alkoxysilane groups per alkoxysilane compound, X is a higher number or equal to 2, in particular between 2 and 500, preferably between 2.5 and 200, and even more preferably between 3 and 100. According to one particular embodiment, X is between 2 and 10, better still between 2 and 5. and in particular is equal to 2 or 2.5 or even 3. Indeed, the larger the value of X, the higher the crosslinking potential. Also, a high X further improves stability. Alkonsilane compounds A A composition according to the invention comprises at least one alkoxysilane compound A chosen from at least one triethoxysilane (ALK) monomer, at least one triethoxysilane (ALK) oligomer, their derivative (s), and their mixture, with ALK representing an alkyl group, linear or branched, unsubstituted, C1-C4, in particular C1-C2, preferably methyl.

According to one embodiment, the alkoxysilane compound (s) is (are) chosen from at least one methyltriethoxysilane monomer (MTES), at least one methyltriethoxysilane oligomer (MTES), their ) derivative (s), and their mixture.

The MTES can for example be sold by the company EVONIK under the name DYNASYLAN MTES. According to an advantageous embodiment of the present invention, the total content of alkoxysilane compound (s) A preferably represents at least 70% by weight relative to the total weight of the composition, in particular from 70 to 98% by weight. weight, preferably from 75% to 95% by weight relative to the total weight of the composition. According to an advantageous embodiment of the present invention, the total content of alkoxysilane compound (s) A represents at least 80% by weight, relative to the total weight of the alkoxysilane compounds, in particular at least 85% by weight, preferably at least 90% by weight, more preferably at least 95% by weight, and still more preferably 100% by weight relative to the total weight of the alkoxysilane compounds. In other words, an advantageous embodiment of a composition according to the invention may comprise one or more alkoxysilane compound (s) but comprising at least one alkoxysilane compound of type A: - present alone in the composition, representing then 100% by weight of the alkoxysilane compounds present in the composition, or - either in admixture with one or more other alkoxysilane compound (s) not meeting the given definition of alkoxysilane compound (s) ) of type (A) for example but preferably, corresponding to the definition of compound (s) alkoxysilane (s) type (B) or (C), but in this case the weight content of compound (s) A is then at less than 80% by weight, relative to the total weight of the alkoxysilane compounds present in the composition. Alkonsilane compounds B A composition according to the invention optionally comprises at least one alkoxysilane compound B. The alkoxysilane compound (s) B is (are) chosen from at least one alkoxysilane monomer, at least one alkoxysilane oligomer, their derivative (s), and their mixture, of formula (I): R1xSi (OR2) (4_x) (I) Formula (I) in which: R1 represents independently a hydrocarbon group , in particular a C1-C20, preferably C1-C8, hydrocarbon-based chain interrupted by at least one, and / or carrier of at least one heteroatom, in particular an oxygen atom, or an oxo group or their combinations, in particular carboxyl, carbonyl, an ether group, an ester group such as carbonyloxy, in particular interrupted by an ester group such as carbonyl oxy, in particular at a silicon atom, R2 representing, independently, an atom of hydrogen, or a C1-C10 hydrocarbon chain, preferably a hydrocarbon chain at C2, x represents 1, 2 or 3, preferably is equal to 1. The alkoxysilane compound (s) B of formula (I) is (are) chosen from the compound (s) wherein Rc represents, independently, a (C 1 -C 28) alkyl group such as a methyl or a group (Ia) embedded image C 1 -C 8) alkoxy, preferably an ethoxy group, Rd and Re, independently, represent a (C 1 -C 10) alkyl group, preferably an ethyl group, Rf represents a hydrogen atom, or a group (C 1 -C 20) alkyl, or a group of the following formula (Ib): where Rn represents a (C 1 -C 20) alkyl group such as a methyl group, k and m represent, independently, an integer of between 1 and 20, preferably between 1 and 3, preferably 1.

The alkoxysilane compound (s) B is (are) chosen from acetoxymethyltriethoxysilane and mixtures thereof. Acetoxymethyltriethoxysilane may for example be sold by ABCR under the name AB110784. According to a preferred embodiment of the present invention, the total content of alkoxysilane compound (s) B represents from 0% to 10% by weight, relative to the total weight of the composition, in particular from 2% to 8% by weight, relative to the total weight of the composition. According to a preferred embodiment, the total content of alkoxysilane compound (s) B represents from 0% to 10% by weight, relative to the total weight of the alkoxysilane compounds, in particular from 2% to 8% by weight. , based on the total weight of the alkoxysilane compounds. Alkonsilane compounds C A composition according to the invention optionally comprises at least one alkoxysilane compound C. The alkoxysilane compound (s) C (s) is (are) chosen from at least one alkoxysilane monomer, at least one alkoxysilane oligomer, their derivative (s), and their mixture, of formula (II): R1'xSi (OR2 ') (4_x) (II) Formula (II) in which: R1' independently representing a hydrocarbon group, in particular a hydrocarbon chain, C1-C20, preferably C1-C8, interrupted by at least one, and / or carrying at least one amino group (-N (R) - or -NRR 'with R, R', which may be identical or different, representing a hydrogen atom or a C 1 -C 8 alkyl group), in particular carrying an amino group such as NH 2, preferably terminated by an NH 2, R 2 group; independently representing a hydrogen atom, or a C1-C10 hydrocarbon chain, preferably a C2 hydrocarbon chain, x represents 1, 2, or 3, preferably is equal to 1. The alkoxysilane compound (s) C of formula (II) is (are) chosen from the following compound (s) of formula (11a): Ra Rc Rd II / Where R a and R b are, independently, a hydrogen atom, or a (C 1 -C 20) alkyl group, such as a methyl group or a cyclohexyl group, or an aryl group such as phenyl or benzyl, or a (C 1 -C 20) aminoalkyl group, OR (C 1 -C 20) hydroxyalkyl group, or a (C 1 -C 10) alkoxy group, or a group of the following formula (11b) or (11c): ## STR2 ## where R 1 represents a (C 1 -C 20) alkyl group such as a methyl or a C 1 -C 10 alkoxy group preferably an ethoxy group, with Rk and RI, independently, representing a (C 1 -C 10) alkyl group, preferably an ethyl group, R nn (iic) with R m representing a (C 1 -C 20) alkyl group, or a group (C 1 -C 10) ) alkoxy such as a methoxyl or an amino group, Ra and Rb can be connected to form a cy eg, a cyclohexyl group, preferably Ra and Rb each represent a hydrogen atom, k and m represent, independently, an integer between 1 and 20, preferably between 1 and 3, preferably equal to 3. The alkoxysilane compound (s) C is (are) selected from 3-aminopropyltriethoxysilane (APTES), 3-aminopropylmethyldiethoxysilane (APMDES) and oligomers formed from APTES or APMDES or N-cyclohexylaminomethyl triethoxysilane. The APTES may for example be sold by the company Dow Corning under the name XIAMETER OFS-6011 SILANE or under the name APTES SILSOFT A-1100 by the company MOMENTIVE PERFORMANCE MATERIALS. APMDES may, for example, be sold by the company Evonik under the name Dynasylan 1505. N-cyclohexylaminomethyl triethoxysilane may, for example, be sold by the company Wacker under the name GENIOSIL XL 926. Preferably, the alkoxysilane compound C is 3- aminopropyltriethoxysilane (APTES). According to a preferred embodiment of the present invention, the total content of alkoxysilane compound (s) C represents from 0% to 20% by weight, relative to the total weight of the composition, in particular from 2% to 15% by weight, relative to the total weight of the composition. According to a preferred embodiment, the total content of alkoxysilane compound (s) C represents from 0% to 20% by weight, relative to the total weight of the alkoxysilane compounds, in particular from 2% to 15% by weight. , based on the total weight of the alkoxysilane compounds. A composition according to the present invention comprises as alkoxysilane compound (s) only the first alkoxysilane (s) A. A composition according to the present invention comprises as compound (s) alkoxysilane (s) only the alkoxysilane compound (s) A and the alkoxysilane (s) compound (s) B. A composition according to the present invention comprises as alkoxysilane compound (s) ( s) only the alkoxysilane (s) A compound (s) and the alkoxysilane (s) C compound (s).

A composition according to the present invention comprises, as compound (s) alkoxysilane (s) compound (s) alkoxysilane (s) A, the compound (s) alkoxysilane (s) B, and the (s) the compound (s) alkoxysilane (s) C.

According to a preferred embodiment, a composition according to the present invention consists essentially of alkoxysilane (s) compound (s) A, optionally alkoxysilane compound (s) B, optionally alkoxysilane compound (s) C, water, an acid, optionally a solvent, preferably at least one polar volatile solvent, optionally an ogenated film polymer. Thus, according to a more preferred embodiment, a composition according to the present invention consists essentially of alkoxysilane compound (s) A, water and an acid.

According to a particular embodiment of the invention, the alcohol generated in the composition during the hydrolysis and condensation reaction may be partially or totally eliminated, in particular by evaporation under vacuum. According to yet another embodiment, the composition may comprise a solvent or a mixture of solvents.

Acids A composition according to the present invention may also comprise at least one acid. This acid may be selected from lactic acid, acetic acid, citric acid, tartaric acid, hydrochloric acid, sulfuric acid, and phosphoric acid. This acid is preferably hydrochloric acid. The hydrochloric acid (pure) may in particular be present in the composition in a content ranging from 0.001 to 0.5% by weight, preferably in a content ranging from 0.01 to 0.1% by weight, relative to total weight of the composition.

Polar Volatile Solvents A composition according to the invention may also comprise at least one polar volatile solvent. By "polar volatile solvent" is meant in the present invention a liquid compound at room temperature comprising at least one polar group such as a hydroxyl group, ester, ketone, ether, or aldehyde, and having a vapor pressure greater than 1 mbar at 20 ° C. Among the volatile polar solvents that can be used in the compositions in accordance with the invention, there may be mentioned in particular C 1 -C 5 monohydric alcohols chosen preferably from ethanol, isopropanol, butanol, butan-2-ol, methylpropan-1-ol, methylpropan-2-ol, preferably ethanol. Mention may also be made of C 3 -C 4 ketones, C 2 -C 4 aldehydes and C 2 -C 4 short chain esters, preferably chosen from ethyl acetate, propyl acetate and acetate. butyl.

The volatile volatile solvent (s) may be present in the composition at a total content ranging from 0% to 40% by weight relative to the total weight of the composition. preferably at a content greater than or equal to 10% by weight, relative to the total weight of the composition, and less than 30% by weight relative to the total weight of the composition.

Molecular Polymers A composition according to the invention may also comprise at least one film-forming polymer. For the purposes of the present invention, the term "film-forming polymer" denotes a polymer capable of forming on its own or in the presence of a plasticizer an isolatable film, in particular a continuous and adherent film, on a support, in particular on the nails. In the composition, it is possible to use a single film-forming polymer or a mixture of film-forming polymers.

This film-forming polymer may be chosen from the group consisting of synthetic polymers, of radical type or of polycondensate type, polymers of natural origin and their mixtures.

A film-forming polymer that is suitable for the invention may be chosen in particular from: polysaccharides. Among the polysaccharides that are suitable for the invention, mention may be made, for example, of cellulose esters and ethers, such as nitrocellulose, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate or ethyl cellulose. still guar gum, optionally modified, such as ethylguar. - Silicone resins. The nomenclature of silicone resins is known under the name of "MDTQ", the resin being described according to the different siloxane monomeric units that it comprises, each of the letters "MDTQ" characterizing a type of unit. By way of examples, mention may be made of polymethylsilsesquioxane resins, sold in particular by Wacker under the reference Resin MK such as Belsil PMS MK or by Shin-Etsu under the references KR-220L. Mention may also be made of polyphenylsilsesquioxane resins, sold in particular by Wacker under the reference BELSIL SPR 45VP. Mention may also be made of trimethylsiloxysilicate (TMS) resins such as those sold under the reference SR1000 by the company General Electric or under the reference TMS 803 by the company Wacker. synthetic polymers such as polyurethanes, acrylic polymers, vinyl polymers, polyvinylbutyrals, alkyd resins and ketone / aldehyde resins, resins derived from aldehyde condensation products, such as arylsulfonamide formaldehyde resins such as resin toluene sulfonamide formaldehyde, aryl-sulfonamide epoxy resins or ethyl tosylamide resins; polymers of natural origin, such as plant resins such as dammars, elemi, copals, benzoin; gums such as shellac, sandalwood gum and putty gum. As the film-forming polymer, the toluene sulphonamide formaldehyde resins "Ketjentflex MS80" from the company Akzo or "Santolite MHP", "Santolite MS 80" from the company Fontronno or "Resimpol 80" from the company PAN AMERICANA can be used, the resin "BECKOSOL ODE 230-70-E" alkyd from the company DAINIPPON, the acrylic resin "ACRYLOID B66" from the company ROHM & HAAS, the polyurethane resin "TRIXENE PR 4127" from BAXENDEN, the acetophenone / formaldehyde resin marketed under the reference Synthetic Resin 5 SK by Degussa. According to a particular embodiment, the film-forming polymer is chosen from polysaccharides or polysaccharide derivatives, preferably from ethers and cellulose esters. According to another particular preferred embodiment, the film-forming polymer is chosen from silicone resins, preferably from polysilsesquioxanes. For example, the content of film-forming polymer may range from 0.1% to 30%, especially from 0.5% to 20% by weight, in particular from 1% to 15% by weight, relative to the total weight of the composition. Dyestuffs A composition according to the invention may further comprise at least one dyestuff, organic or inorganic, in particular of the pigment or nacre type, conventionally used in cosmetic compositions. By "pigments" are meant white or colored, mineral or organic particles, insoluble in an aqueous solution, intended to color and / or opacify the resulting coating. The pigments may be present in a proportion of from 0.01% to 15% by weight, in particular from 0.01% to 10% by weight, and in particular from 0.02% to 5% by weight, relative to the total weight of the composition. As inorganic pigments that can be used in the invention, mention may be made of titanium oxide, zirconium oxide or cerium oxide, as well as zinc, iron or chromium oxides, ferric blue, manganese violet, ultramarine blue and the like. chromium hydrate. It may also be pigments having a structure which may be, for example, sericite / brown iron oxide / titanium dioxide / silica. Such a pigment is marketed for example under the reference COVERLEAF NS or JS by CHEMICALS AND CATALYSTS and has a contrast ratio of about 30. The dyestuff may also comprise a pigment having a structure which may be for example microspheres type. silica containing iron oxide. An example of a pigment having this structure is that marketed by MIYOSHI under the reference PC BALL PC-LL-100P, this pigment consisting of silica microspheres containing yellow iron oxide. Among the organic pigments that can be used in the invention, mention may be made of carbon black, D & C type pigments, cochineal carmine, barium, strontium, calcium, aluminum or diketo pyrrolopyrrole (DPP) lacquers. ) described in EP-A-542669, EP-A-787730, EPA-787731 and WO-A-96/08537. According to a particular embodiment of the invention, the pigments may be treated or coated with a treatment agent. By "nacres", it is necessary to include colored particles of any shape, iridescent or not, in particular produced by certain shellfish in their shell or else synthesized, and which exhibit a color effect by optical interference.

The nacres may be chosen from pearlescent pigments such as iron oxide-coated titanium mica, bismuth oxychloride-coated mica, titanium mica coated with chromium oxide, titanium mica coated with an organic dye. as well as pearlescent pigments based on bismuth oxychloride. It may also be mica particles on the surface of which are superimposed at least two successive layers of metal oxides and / or organic dyestuffs. Mention may also be made, by way of example of nacres, of natural mica coated with titanium oxide, with iron oxide, with natural pigment or with bismuth oxychloride.

Among the nacres available on the market, mention may be made of mother-of-pearl TIMICA, FLAMENCO and DUOCHROME (based on mica) marketed by ENGELHARD, TIMIRON pearls marketed by MERCK, mother-of-pearl containing PRESTIGE mica marketed by the company. ECKART and nacres based on SUNSHINE synthetic mica sold by the company SUN CHEMICAL. The nacres may more particularly have a color or a yellow, pink, red, bronze, orange, brown, gold and / or coppery reflection. As an illustration of nacres that can be used in the context of the present invention, mention may be made especially of gold-colored nacres sold especially by ENGELHARD under the name Brillant gold 212G (Timica), Gold 222C (Cloisonne), Sparkle gold (Timica), Gold 4504 (Chromalite) and Monarch gold 233X (Cloisonne); bronze nacres sold especially by the company Merck under the name Bronze Fine (17384) (Colorona) and Bronze (17353) (Colorona) and by Engelhard under the name Super Bronze (Cloisonne); orange nacres sold especially by the company Engelhard under the name Orange 363C (Cloisonne) and Orange MCR 101 (Cosmica) and by the company Merck under the name Passion Orange (Colorona) and Matte Orange (17449) (Microna); brown-colored pearlescent agents marketed by Engelhard under the name Nu-antique copper 340XB (Cloisonne) and Brown CL4509 (Chromalite); nacres with a copper sheen sold especially by Engelhard under the name Copper 340A (Timica); the nacres with a red glint sold especially by MERCK under the name Sienna fine (17386) (Colorona); yellow-colored pearlescent agents marketed by ENGELHARD under the name Yellow (4502) (Chromalite); the red-colored pearlescent agents with a gold glint sold especially by ENGELHARD under the name Sunstone G012 (Gemtone); pink nacres sold especially by Engelhard under the name Tan opal G005 (Gemtone); the black nacres with gold reflection sold by the company Engelhard under the name Nu antique bronze 240 AB (Timica), the blue nacres sold especially by the company Merck under the name Matte Blue (17433) (Microna), the white nacres with reflection silver sold in particular by the company Merck under the name Xirona Silver and the golden-green orange-colored mother-of-pearl marketed by Merck under the name Indian summer (Xirona) and their mixtures. A composition according to the invention may also comprise water-soluble or fat-soluble dyes in a content ranging from 0.01 to 10% by weight, especially ranging from 0.01 to 5% by weight relative to the total weight of the composition. Fat-soluble dyes are, for example, Sudan Red, DC Red 17, DC Green 6, 6-carotene, soybean oil, Sudan Brown, DC Yellow 11, DC Violet 2, Orange DC 5, yellow quinoline. The water-soluble dyes are, for example, beet juice, methylene blue. It may also contain one or more formulation additives commonly used in cosmetics and more specifically in the cosmetic field of nails. They may especially be chosen from vitamins, trace elements, softeners, sequestering agents, wetting agents, thickening agents, dispersing agents, defoamers, spreading agents, co-resins, film-forming polymers, plasticizers, fillers, coalescing agents, preservatives, UV filters, actives, moisturizing agents, neutralizers, stabilizers, antioxidants and mixtures thereof. The polar dye (s) may be present in the composition at a total content ranging from 0% to 15% by weight relative to the total weight of the composition. . According to a preferred embodiment, a composition according to the invention is free of dyestuffs and in particular is free of pigment (s) and is free of mother-of-pearl (s). Assets A composition according to the invention more particularly intended for the makeup and / or care of the nails may in particular comprise at least one active. As active agents, hardeners for keratinous substances, active agents acting on the growth of the nail, for example methylsulfonyl methane, and / or active agents for treating various conditions localized at the level of the nail, as for example onychomycosis. According to a preferred embodiment, a composition according to the invention is free of active (s).

A composition according to the invention may be in the form of an aqueous or organic-aqueous solution or suspension of an oil-in-water, water-in-oil or multiple emulsion, especially a cream or a milk; an aqueous or oily gel, a dispersion, a spray composition, or a patch. A composition according to the invention can therefore be in the form of a makeup composition such as a nail polish, a base for varnish, a nail care, a liquid lipstick, a foundation, a hair composition such as a lacquer, a styling lotion or a styling spray, preferably is in the form of nail polish, a base for varnish, a nail care. It is more preferably a nail polish, said nail polish may be transparent or colored. Preferably a composition according to the invention is in the form of an aqueous or aqueous-alcoholic solution or gel. A composition according to the invention comprises a physiologically acceptable medium. By "physiologically acceptable medium" is meant a non-toxic medium that can be applied to keratin materials and / or human teeth and of appearance, smell and pleasant touch. According to a particular embodiment, a composition in accordance with the present invention comprises a reactive additive comprising a hydroxyl function, such as a polyol and in particular a glycol, and in particular glycerol.

According to a particular embodiment, a composition according to the present invention comprises a sol-gel reaction inhibitor, such as acetyl acetone.

RECOVERY KITS A composition according to the invention is preferably contained in a single package. However, it may also be in the form of a kit for coating keratin materials comprising at least two different compositions packaged separately. According to this second embodiment, said at least two different compositions can be associated just before or during the application. Each composition of the kit can be packaged separately in the same packaging article. This second embodiment may in particular be suitable for a composition according to the present invention containing a mixture of alkoxysilane compounds, in particular containing, in addition to the alkoxysilane compound (s) A, at least one alkoxysilane compound B and / or less than an alkoxysilane compound C. According to a particular embodiment, the kit may comprise a first composition according to the present invention as previously described, preferably free of dyestuff (s), and a second composition comprising at least a coloring material, such as a colored varnish. According to a particular embodiment, the first composition according to the invention as described above comprises as alkosysilane compound (s), at least one alkoxysilane compound A and optionally at least one alkoxysilane compound B, and said second The composition may comprise at least one alkoxysilane compound C. According to another particular embodiment, the kit may comprise a first composition according to the present invention as previously described, preferably free of dyestuff (s), and a second so-called catalysis composition, acid or basic, to be applied before or after said composition according to the present invention. Such a second composition is particularly useful in the presence of the compound (s) alkoxysilane (s) A. According to a more particular embodiment, said second catalysis composition may be an aqueous solution buffered at basic pH by at least one agent. alkali, in particular chosen from sodium glycinate, sodium carbonate, sodium bicarbonate, and alkoxysilane compound (s) C, such as APTES, for example at a pH of between 8 and 11; According to another more particular embodiment, said second catalysis composition may be an aqueous solution buffered at acidic pH by at least one acidic agent, in particular chosen from citric acid or lactic acid, for example at a pH included between 2.5 and 5. According to a still more particular embodiment, the kit may comprise a first composition according to the invention, preferably free of dyestuff (s), a second composition called catalysis, and a e third composition comprising at least one dyestuff, such as a colored varnish. Such a so-called catalysis composition associated with a composition according to the invention makes it possible to ensure a better grip of the composition according to the invention on the nail and / or to reinforce the behavior of the composition according to the invention on the nail. . According to a particular embodiment, each composition of the kit according to the invention may be packaged in a multi-compartmented felt, the first composition being delivered by one end of the felt and the second composition being delivered by another end of the felt, each end for example being sealed by a cap. Each composition may also be packaged in a separate compartment within the same packaging article, the mixture of the at least two compositions being effected at the end (s) of the packaging article when the delivery of the composition. The packaging article (s) may be watertight and / or airtight.

Alternatively, each composition can be packaged in a different packaging article. Of course, each composition comprises a physiologically acceptable medium, that is to say a non-toxic medium that can be applied to keratin materials of human beings and of appearance, smell and pleasant touch. In addition, each composition is liquid before application to keratin materials. Following the sol / gel reaction, a coating is obtained directly on the keratin materials.

COATING PROCESSES According to the embodiment relating to a single composition, the present invention relates to a cosmetic process for coating keratin materials, comprising applying to said keratinous materials at least one layer, preferably a plurality of layers, of a composition according to the invention. According to a particular embodiment, the present invention also relates to a cosmetic process for coating keratin materials, comprising applying to said keratin materials at least two different compositions as defined above.

According to a particular embodiment, a process according to the invention comprises at least one step of application, preferably a first step, of a first composition comprising at least the alkoxysilane compound (s) A, and at least one application step, preferably a second step, comprising at least the alkoxysilane (s) B compound (s) and / or the alkoxysilane (s) compound (s). a particular embodiment, a method according to the invention comprises a first step of applying a first composition according to the present invention, preferably free of dyestuff (s), and a second composition comprising at least a coloring material, such as a colored varnish. According to a particular embodiment, a method according to the invention comprises a step of applying a first composition according to the present invention as previously described, preferably free of dyestuff (s), followed or preceded a step of applying a so-called catalysis composition, acid or basic as described above. Such a second step is particularly useful in the presence of the alkoxysilane (s) compound (s) A. It should be noted that the first step of applying the methods described above may be followed by a step of eliminating the less partially the layer (s) of cosmetic composition applied. To achieve this second step, a woven or non-woven material may be used, such as cotton. According to a preferred embodiment, said keratin materials relate more particularly to the nails.

According to one embodiment, the composition (s) and the mixture according to the invention may be applied to keratin materials, and more particularly to the nails, using a felt pen. Uses The particular uses of a composition, and possibly a first and a second composition, according to the present invention may be chosen in particular, independently or in combination, from: a strengthening of the mechanical properties of the nails, for example intended to treat soft and fragile nails; a fresh effect during and / or after application of said composition according to the present invention; - An effect of hydration of the cuticles - a reduction or even disappearance of the task (s) occurring following the application of colored nail polish by the prior application of a composition according to the present invention. Examples of embodiments The examples given below are presented for illustrative and not limiting of the invention. Compositions have been prepared and applied using various application devices. These exemplary embodiments also gave rise to a macroscopic evaluation of the compositions obtained as well as an evaluation using an electron microscope with X-ray scanning.

In the following examples, the references of the raw materials used were listed: MTES (methyltriethoxysilane): DYNASYLAN MTES (EVONIK) (alkoxysilane compound A) Acetoxymethyltriethoxysilane: AB110784 (ABCR) (alkoxysilane compound B) APTES (3-aminopropyltriethoxysilane): SILSOFT A -1100 (MOMENTIVE PERFORMANCE MATERIALS) (alkoxysilane compound C) Polysilicone 8: POLY DIMETHYL / METHYL SILOXANE GRPTS METHYL PROPYL TH10-3 ACRYLATE / METHYL METHACRYLATE / METHACRYLIC ACID L021 DRY (Film-forming polymer marketed by the company 3M) Ingredients Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 (content in content (content (content (content in dry matter content in%) in dry matter material matter matter in dry matter dry dries%) in%) in%) in%) in%) MTES 90.8 70 80.72 79.7 86.14 45.4 APTS / / 11.13 5.5 5,628 / Acetoxymethyl triethoxysilane / / / 5, 86 / / Water 9.1 7 8.07 8.49 8.15 4.55 HCI 0.1M 0.1 0.07 0.08 0.45 0.082 0.05 Ethanol / 22.93 Ethyl acetate / / / / / 12.5 Poly / / / / / 12.5 silicone-8 Example 1 In a plastic bottle, MTES (M = 178.3 g / mol) was introduced. The 0.1M hydrochloric acid solution and water are added. The mixture is stirred for one hour. The solution is then placed in an oven at 60 ° C. for 16 hours. In the case of Example 2, a solvent is then added. nH20 = 0.5 X = (Alkoxysilanes * nbAloxy groups) nH20 = 3 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time.

The composition 1 obtained is then applied to nail cuts and observed by scanning electron microscopy with X-ray detection show the presence of silicon in the treated nails significantly superior compared to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention. Example 2 In a plastic bottle, the MTES (M = 178.3 g / mol) is introduced. The 0.1M hydrochloric acid solution and water are added. The mixture is stirred for one hour. The solution is then placed in an oven at 60 ° C. for 16 hours. In the case of Example 2, a solvent is then added. ni-120 = 0.38 X = (nAloxoxysilanes * nbAloxy groups) nH20 = 3 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time. The resulting composition 2 is then applied to nail clippings and observed by scanning electron microscopy with X-ray detection to show the presence of silicon in the treated nails significantly superior to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention.

Example 3 In a plastic bottle, the MTES and the 0.1M HCl solution are introduced, which are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, the APTES (M = 221.37 g / mol) is added to the mixture. After stirring for one hour, the solution is placed in an oven at 60 ° C. for 16 hours. ni-120 = 0.45 X = alkoxysilanes * nbAloxy groups) ni-120 = 3.33 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time.

The composition 3 obtained is then applied to nail clipping and observed by scanning electron microscopy with X-ray detection show the presence of silicon in the treated nails significantly superior compared to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention. Example 4 In a plastic bottle, the MTES and the 0.1M HCl solution are introduced, which are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, the APTES and acetoxymethyltriethoxysilane (M = 236.34 g / mol) are added to the mixture. After stirring for one hour, the solution is placed in an oven at 60 ° C. for 16 hours. ni-120 = 0.47 X = (nAloxoxysilanes * nbAloxy groups) nH20 = 3 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time. The resulting composition is then applied to nail clippings and observed by scanning electron microscopy with X-ray detection to show the presence of silicon in treated nails significantly superior to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention. EXAMPLE 5 In a plastic bottle, the MTES and the 0.1M HCl solution are introduced. with vigorous stirring using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear, the APTES and acetoxymethyltriethoxysilane (M = 236.34 g / mol) are added to the mixture. After stirring for one hour, the solution is placed in an oven at 60 ° C. for 16 hours. ni-120 = 0.45 X = (Alkoxysilanes * nbAloxy groups) ni-120 = 3.1 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time. The resulting composition is then applied to nail clippings and observed by scanning electron microscopy with X-ray detection to show the presence of silicon in treated nails significantly superior to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention.

Example 6 In a plastic bottle, the MTES is introduced (M = 178.3 g / mol). The 0.1M hydrochloric acid solution and water are added. The mixture is stirred for one hour. The solution is then placed in an oven at 60 ° C. for 16 hours. In the case of Example 6, the solvents and the silicone film-forming polymer are then added. ni-120 = 0.25 X = (nAloxoxysilanes * nbAloxy groups) nH20 = 3 The composition is spread on a contrast map. After 10 to 15 minutes, a transparent and shiny coating is obtained. The final solution does not gel over time.

The resulting composition 6 is then applied to nail clippings and observed by scanning electron microscopy with X-ray detection to show the presence of silicon in the treated nails significantly superior to an untreated nail. Such a presence of silicon could be correlated with a reinforcement of the nail treated with the composition according to the present invention. All the compositions prepared were applied to the nails using a Porex® Nibs felt tip, allowing uniform, smooth and precise application.

After one week of storage of the composition, the compositions were again applied by the same felt tips already used, giving rise again to a uniform, smooth and precise application. In addition, the felt tip of porous thermoplastic material does not change color over uses, unlike fiber felt felt tips.

In addition, applications using brushes immersed in a bottle, gave less satisfactory results, the application being less precise than with a felt tip, the product flowing around the nail. In addition, if the brush is adapted to the end of a tube-type container and does not permanently soak in the composition, the brush fibers clog during drying of the composition and the application is no longer possible. The use of polyamide rods is not suitable either because the material is degraded by the composition. Sensory evaluations Nail strengthening effect The composition according to the invention according to Example 2 is tested with a panel of consumers versus a nail hardener product of Sililevo under the trade name of Nagellack. Sililevo's product is applied to the nail in two layers by a professional makeup artist on a hand of panelists. On the other hand is applied the composition formula according to Example 2. The surplus is wiped with a cotton. Just after the application, the deposition of the composition according to Example 2 is considered more uniform and brighter. The nails are considered more pink and healthier.

After 24 hours, 4 out of 7 people find their nails harder with the composition formula according to Example 2. Hydration effect On application, the compositions of Examples 1 to 6 cause a fresh effect on the nail, which is felt as a hydration effect. The product has an oily sensory, the contact with the cuticles causes a feeling of hydration. Anti-stain effect The composition according to the invention of Example 1 is applied for 5 days each day on the nails of one hand. On the other hand, no product is applied. The nails of both hands are then made up by a varnish of the brand Club of the Creators of Beauty, Agnès B, Jean collection, Calamity Jean.

The varnish is kept on the nails for 4 days and then cleansed with a solvent, for example containing ethyl acetate. The nails on which the pretreatment based on the composition according to Example 1 was applied were significantly less stained with residual dyestuff than the nails of the hand where no product had been previously applied to the varnish. Comparative Example of Cosmetic Composition Excluding the Invention The following counterexample shows the necessity of introducing a quantity of water according to the present invention with regard to the number of alkoxy groups present in the composition: Ingredients%% MTES content 55 APTES 22,8 Water at pH = 1 22.2 In a plastic bottle, 22.2 g of 0.1M HCl are added to a mixture of 55 g of MTES. The alkoxysilane monomers and the 0.1M HCl solution are stirred vigorously using a magnetic stirrer until a clear solution is obtained. 10 minutes after the solution becomes clear 22.8 g of APTES are added to the mixture. nH 2 O = 1.2 X = (nAloxoxysilanes nbAloxy groups) nH 2 O = 1 After 30 minutes of stirring, the solution is gelled. The composition is therefore not applicable on the nails. It is understood that in the context of the present invention the weight percentages given for a compound or a family of compounds are always expressed as the dry weight of the compound in question. Throughout the application, the wording "comprising a" or "comprising a" means "comprising at least one" or "comprising at least" one unless the contrary is specified.

Claims (19)

REVENDICATIONS1. A coating assembly for keratin materials, in particular nails including cuticles, comprising: (i) a cosmetic composition of the sol / gel type for coating keratinous substances, in particular intended to coat the nails, comprising the product (s) ( s) resulting from the reaction of: a) at least one alkoxysilane compound A chosen from at least one triethoxysilane (ALK) monomer, at least one triethoxysilane (ALK) oligomer, their derivative (s), and their mixture, with ALK representing an alkyl group, linear or branched, unsubstituted, C1-C4, in particular C1-C2, preferably a methyl, b) optionally at least one alkoxysilane compound B selected from at least one monomer of alkoxysilane, at least one alkoxysilane oligomer, their derivative (s), and their mixture, of formula (I): R1xSi (OR2) (4_x) (I) Formula (I) in which: R1 independently represents a hydrocarbon group, in particular a hydrocarbon chain, in C1-C2 0, preferably C1-C8, interrupted by at least, and / or carrier of at least one heteroatom, in particular an oxygen atom, or an oxo group or combinations thereof, in particular carboxyl, carbonyl, a group ether, an ester group such as carbonyloxy, in particular interrupted by an ester group such as carbonyl oxy, in particular at a silicon atom, R2 representing, independently, a hydrogen atom, or a hydrocarbon chain C1-C10 , preferably a C2 hydrocarbon chain, x represents 1, 2, or 3, preferably is equal to 1, c) optionally at least one alkoxysilane compound C chosen from at least one alkoxysilane monomer, at least one oligomer of alkoxysilane, their derivative (s), and their mixture, of formula (II): FexSi (OR2 ') (4_x) (II) Formula (II) in which: R1' independently represents a hydrocarbon group, in particular a hydrocarbon chain, in C1-C20, preferably C1-C8, interrupted by at least one n, and / or carrier of at least one amino group (-N (R) - or -NRR 'with R, R', which may be identical or different, representing a hydrogen atom or a C 1 -C 8 alkyl group), in particular bearing an amino group such as NH 2, preferably terminated by an NH 2 group, R 2 'representing, independently, a hydrogen atom, or a C 1 -C 10 hydrocarbon-based chain, preferably a C 2 -C 4 hydrocarbon-based chain; is 1, 2, or 3, preferably 1, and, (d) an amount of water corresponding to a number of moles of water, determined according to the following equation: X = (Alkoxysilanes * nbAloxy groups) nH20 With: nE-120 = Number of moles of water, nAlcoxysilanes = Number of moles of alkoxysilane compounds, nbAlkoxy groups = Weighted average of the number of alkoxysilane groups per alkoxysilane compound, and X is a number greater than or equal to 2, and (ii) a felt tip adapted to apply said composition made of porous plastic material (s), more preferably referentially made of porous thermoplastic material (s), preferably having pore sizes between 7 and 250 μm. 2. The assembly of claim 1, wherein the (s) alkoxysilane compound (s) A is (are) chosen from at least one monomer of MTES, at least one oligomer of MTES, their (s) derivative (s), and their mixture, 3. The assembly of claim bu 2, wherein the total content of alkoxysilane (s) A compound (s) is at least 70% by weight relative to the total weight of the composition, in particular from 70 to 98% by weight, of preferably from 75% to 95% by weight relative to the total weight of the composition. 4. The assembly of claim 1, 2 or 3, wherein the total content of alkoxysilane compound (s) A is at least 80% by weight, relative to the total weight of the alkoxysilane compounds, in particular at least 85%. by weight, preferably at least 90% by weight, more preferably at least 95% by weight, and still more preferably 100% by weight relative to the total weight of the alkoxysilane compounds. 5. The assembly as claimed in any one of the preceding claims, in which the total content of alkoxysilane compound (s) B represents from 0% to 10% by weight relative to the total weight of the alkoxysilane compounds, in particular from 2 to 8% by weight relative to the total weight of the alkoxysilane compounds. 6. The assembly as claimed in any one of the preceding claims, in which the total content of alkoxysilane compound (s) C represents from 0% to 20% by weight relative to the total weight of the alkoxysilane compounds, in particular from 5 to 15% by weight relative to the total weight of the alkoxysilane compounds 7. An assembly according to any one of the preceding claims, wherein X is between 2 and 500, preferably between 2.5 and 200, and even more preferably between 3 and 100. 8. The combination as claimed in any one of the preceding claims, in which the alkoxysilane (s) compound (s) B of formula (I) is (are) chosen from the compound (s) of following formula (Ia): Rc Rd I / Si ---- Rf 0 ----- k N _ 0-Re (la) Formula (la) in which: Rc represents, independently, a group (Ci-C20) ) alkyl such as a methyl or a (Ci-Cio) alkoxy group, preferably an ethoxy group, Rd and Re, independently, represent a (Ci-Cio) alkyl group, preferably an ethyl group, Rf represents a hydrogen, or a (C 1 -C 20) alkyl group, or a group of the following formula (Ib): R n O (Ib) with R n representing a (C 1 -C 20) alkyl group such as a methyl group, k and m represent , independently, an integer between 1 and 20, preferably between 1 and 3, preferably equal to 1. 9. An assembly according to any one of the preceding claims, wherein the alkoxysilane compound (s) C of formula (11) is (are) chosen from the compound (s) of formula (11a). ) wherein R a and R b are, independently, a hydrogen atom, or a (C 1 -C 20) alkyl group, such as a methyl group or a cyclohexyl group, or an aryl group such as phenyl or benzyl, or a (C 1 -C 20) aminoalkyl group, OR (C 1 -C 20) hydroxyalkyl group, or a (C 1 -C 10) alkoxy group, or a group of the following formula (11b) or (11c): R 1 / Rk m ', Si, -O, (iib) with R 1 representing a (C 1 -C 20) alkyl group such as a methyl or a group (C 1 -C 4) C10) alkoxy, preferably an ethoxy group, with Rk and R1, independently, representing a (C1-C10) alkyl group, preferably an ethyl group, where Rr1 (R1) with Rm representing a (C1-C20) alkyl group , or a (C 1 -C 10) alkoxy group such as a methoxyl or am group ino, Ra and Rb being connectable to form a ring, for example a cyclohexyl group, preferably Ra and Rb each represent a hydrogen atom, k and m represent, independently, an integer of between 1 and 20, preferably comprised between between 1 and 3, preferably 3. 10. An assembly according to any one of the preceding claims, wherein the alkoxysilane (s) compound (s) B is (are) chosen from acetoxymethyltriethoxysilane and mixtures thereof. 11. An assembly according to any one of the preceding claims, wherein the compound (s) alkoxysilane (s) C is (are) chosen from 3-aminopropyltriethoxysilane (APTES), 3-aminopropylmethyldiethoxysilane (APMDES) ) and oligomers formed from APTES or APMDES or N-cyclohexylaminomethyl triethoxysilane. 12. Assembly according to any one of the preceding claims, comprising at least one acid and / or a base, preferably at least one acid. 13. An assembly according to any one of the preceding claims, comprising at least one film-forming polymer, preferably a silicone resin such as polysilsesquioxanes. 14. Assembly according to any one of the preceding claims, comprising at least one solvent or a mixture of solvents, such as an alcohol or ethyl acetate. 15. Assembly according to any one of the preceding claims, characterized in that it is a nail polish, a base for varnish, a nail care, preferably a nail care. 16. An assembly according to any one of the preceding claims, consisting essentially of alkoxysilane (s) compound (s) A, optionally of alkoxysilane (s) compound (s) B, optionally of alkoxysilane compound (s) C, d water, an acid, optionally a solvent, optionally a film-forming polymer. 17. A cosmetic process for coating keratinous substances, in particular nails, comprising at least one step consisting in applying to said keratinous materials at least one layer of a cosmetic composition of an assembly according to any one of the preceding claims, and preferably a step of at least partially removing said at least one layer of applied cosmetic composition. 18. A cosmetic process for coating keratin materials, in particular nails, according to claim 17, comprising at least one step of applying to said keratinous materials at least one layer of a colored make-up composition, in particular a varnish. colored nails. 19. Cosmetic process for coating keratin materials, according to claim 17 or 18, comprising a step of applying an acid or basic catalysis solution preceding or following a step of applying said at least one layer of a composition. cosmetic assembly according to any one of the preceding claims.