FR2926984A1 - Cosmetic composition, useful for setting, fixing and simultaneous styling and conditioning of the hair, comprises alkoxysilanes and vinylformamide/vinylformamine copolymers having amine compound and amide compound, in medium - Google Patents

Abstract

Cosmetic composition (I) comprises: one or more alkoxysilanes; and one or more vinylformamide/vinylformamine copolymers comprising 10-95 mole% of amine compound (A) and 90-5 mole% of amide compound (B), in a medium. Cosmetic composition comprises: one or more alkoxysilanes; and one or more vinylformamide/vinylformamine copolymers comprising 10-95 mole% of amine compound of formula (-CH 2-CH(NH 2)-) (A) and 90-5 mole% of amide compound of formula (-CH 2-CH(NH-C(=O)-H)-) (B), in a medium. Independent claims are included for: (1) device comprising at least two compartments, of which a first compartment contains a first composition comprising one or more alkoxysilanes, and a second compartment contains a second composition comprising one or more vinylformamide/vinylformamine copolymers, in a medium; and (2) a process for cosmetic treatment of hair, comprising applying (I) to the hair, then carrying out an optional rinsing after an exposure time.

Description

B07 / 4101 EN - VMC OA 08026 / FB

Anonyme known as L'OREAL Cosmetic composition comprising a vinylformamide / vinylformamine copolymer and an alkoxysilane, as well as its use for the hair treatment. Invention of: Katarina BENABDILLAH Cosmetic composition comprising a vinylformamide / vinylformamine copolymer and an alkoxysilane, as well as its use for hair treatment.

The present invention relates to a cosmetic composition comprising, in a cosmetically acceptable medium, or several vinylformamide / vinylformamine copolymers and one or more alkoxysilanes. The present invention also relates to a process for the cosmetic treatment of hair, in particular a process for fixing and / or shaping the hair using the aforementioned composition. The present invention finally relates to a use of this composition for the cosmetic hair treatment, and in particular for styling the hair, that is to say shaping and / or fixing the hairstyle. Hair styling products are usually used to build, structure the hairstyle and give it a lasting hold. They are usually in the form of lotions, gels, mousses, creams, sprays, etc. The corresponding compositions generally comprise one or more film-forming polymers or fixing polymers, in a cosmetically acceptable medium. These polymers allow the formation of a sheathing film on the hair, thus ensuring the maintenance of the hairstyle.

However, the fixing polymer films thus formed have the disadvantage of being relatively friable, which limits in time the holding of the hairstyle, and causes the formation on the hair of unsightly residues. Thus, conventional styling products lead to a fixation of the hairstyle and styling effects that gradually fade over time. In particular, when the product is applied in the morning, the styling effects fade as the day progresses. The next day, styling effects are weak or non-existent.

There is therefore a need for hair compositions which make it possible to obtain sufficient fixation, in particular in terms of the plixing effect (rigidity of the locks) and the long-lasting beauty of the hairstyle, with styling effects persisting all day or even days, while eliminating easily with shampoo and providing a pleasant cosmetic touch. International Patent Application WO 96/03969 generally discloses cosmetic compositions for fixing and / or conditioning hair, which comprise a homopolymer of vinylformamide or a copolymer of vinylformamide and one or more other vinyl monomers in combination with at least one ingredient selected from conditioning agents, emulsifying agents, surfactants, viscosity modifiers, gelling agents, opacifying agents, stabilizing agents, preservatives, sequestering agents, chelating agents, pearlescent agents, clarifying agents, perfumes, dyes, propellants, organic solvents and water. Furthermore, US Pat. No. 4,421,602 describes vinylformamide / vinylformamine copolymers, their preparation and their use in the paper industry to improve retention, flow rate, and flocculation. The Applicant has now discovered that, surprisingly, the combination of a vinylformamide / vinylformamine copolymer with an alkoxysilane made it possible to obtain a hair cosmetic composition providing improved styling properties. In particular, such an association makes it possible to obtain hair styling products that provide sufficient fixation, especially in terms of plixing effect (rigidity of the locks) and durable styling, while being easy to remove when washing and providing a touch. nice cosmetic hair. The present invention thus makes it possible to prepare hair styling products that provide very high degrees of fixation, a very long hold of the hairstyle over time, and good resistance to mechanical stresses. The touch of the hair is particularly soft, and the hair is particularly untied. The subject of the present invention is therefore a cosmetic composition comprising, in a cosmetically acceptable medium: one or more alkoxysilanes, and one or more vinylformamide / vinylformamine copolymers comprising: from 10 to 95 mol% of units of following formula A: CH (A) and from 90 to 5 mol% of units of the following formula: ## STR1 ## The compositions according to the invention make it possible, for example, to perform hair locks with locks, in particular on short hair, which hairstyles are particularly resistant to mechanical stress and have excellent durability over time.

Other objects, features, aspects and advantages of the invention will emerge even more clearly on reading the description and examples which follow. According to the invention, the cosmetic composition comprises, in a cosmetically acceptable medium, one or more alkoxysilanes and one or more vinylformamide / vinylformamine copolymers. By "cosmetically acceptable medium" is meant a medium compatible with keratin materials and in particular the hair. Preferably, the cosmetically acceptable medium comprises water and / or one or more cosmetically acceptable solvents chosen from C1-C4 lower alcohols, such as ethanol, isopropanol, tert-butanol or n-butanol. ; polyols such as propylene glycol; polyol ethers; C5-C10 alkanes; C3.4 ketones such as acetone and methyl ethyl ketone; C1-C4 alkyl acetates such as methyl acetate, ethyl acetate and butyl acetate; dimethoxyethane, diethoxyethane; and their mixtures. The vinylformamide / vinylformamine copolymer or copolymers that can be used in the compositions according to the invention preferably comprise from 10 to 60 mol% of unit of formula A and more particularly from 20 to 40 mol%.

The vinylformamide / vinylformamine copolymer or copolymers according to the invention preferably comprise from 30 to 90 mol% of unit of formula B and more particularly from 60 to 80 mol%. The copolymers according to the invention can be obtained for example by partial hydrolysis of polyvinylformamide. This hydrolysis can be done in acidic or basic medium. The vinylformamide / vinylformamine copolymer or copolymers according to the invention may optionally comprise one or more additional monomeric units. In this case, the latter preferably represent less than 20 mol% of the copolymer.

According to a preferred embodiment, the vinylformamide / vinylformamine copolymer or copolymers according to the invention consist solely of units of formula A and of units of formula B. The weight average molecular weight of said copolymer, measured by diffraction of light, can vary from 10,000 to 30,000,000 g / mol, preferably from 40,000 to 1,000,000 and more preferably from 100,000 to 500,000 g / mol. The cationic charge density of said copolymer may vary from 2 meq / g to 20 meq / g, preferably from 2.5 to 15 and more particularly from 3.5 to 10 meq / g.

By way of example of vinylformamide / vinylformamine copolymers that may be used in the compositions according to the invention, mention may be made, inter alia, of the products sold under the name Lupamine by the company BASF, such as, for example, and in a nonlimiting manner, the products proposed under LUPAMIN 9030 and LUPAMIN 9010. The vinylformamide / vinylformamine copolymer or copolymers are present in the compositions according to the invention in proportions ranging preferably from 0.1 to 25% by weight, more preferably from 0.5 to 20% by weight. by weight and more particularly from 1 to 10% by weight, relative to the total weight of the composition. According to the present invention, the composition comprises one or more alkoxysilanes.

The alkoxysilane (s) that may be used in the composition according to the invention may contain one or more silicon atoms; according to a preferred embodiment, they contain a single silicon atom. The preferred alkoxysilanes according to the present invention are compounds of formula (G) 4-XSi (OR) X, with x denoting an integer ranging from 1 to 3, G denoting identical or different monovalent groups and R denoting a monovalent hydrocarbon radical comprising a or more carbon atoms and optionally one or more heteroatoms.

Preferably, the alkoxysilane (s) contain two or three alkoxy functions. Preferably, the alkoxy functional group (s) are chosen from methoxy and ethoxy functions. According to a preferred embodiment, the alkoxysilane (s) comprise one or more solubilizing functional groups.

By solubilizing functional group is meant in the sense of the present invention any functional chemical group facilitating the dissolution of the alkoxysilane in the cosmetically acceptable medium, in particular in water or in hydroalcoholic mixtures. As solubilizing functional group usable according to the present invention, there may be mentioned in a nonlimiting manner the primary amine, secondary amine, aromatic amine, alcohol, carboxylic acid, sulfonic acid, anhydride, carbamate, urea, guanidine, aldehyde, ester, amide, epoxy, pyrrole, dihydroimidazole, gluconamide, pyridyl and polyether. According to a first embodiment of the invention, the alkoxysilane (s) are chosen from compounds of formula: ## STR2 ## in which: R 4 represents a halogen, an OR 'or R' 1 group; R5 is halogen, OR "or R'2, R6 is halogen, OR" or R'3; R1, R2, R3, R ', R ", R"', R'1, R'2, R'3 represent, independently of one another, a saturated or unsaturated hydrocarbon group, linear or branched, optionally bearing groups R1, R2, R ', R "and R"' may further denote hydrogen, at least two of R4, R5 and R6 respectively denoting OR ', OR' or OR ', with at least two R ', R "and R"' being different from hydrogen, R1, R2, R ', R'1, R'2, R'3, R "and R"' are preferably selected from C1-C12 alkyl, C6-C14 aryl, C6-C14 C1-C8-aryl alkyl, and C6-C14-C1-C6 alkyl-aryl. For example, the at least one alkoxysilane may comprise a substituent comprising a secondary amine function, such as bis [3- (triethoxysilyl) propyl] amine of formula (CH 3 CH 2 O) 3 - Si (CH 2) 3 NH (CH 2) 3 Si (OCH 2 CH 3) 3 provided by the company Fluorochem, la [trimethoxysilylpropyl] amine of formula (CH 3 O) 3 Si (CH 2) 3 NH (CH 2) 3 Si (O CH3) 3 provided by Gelest, bis [methyldiethoxysilylpropyl] amine of formula (CH3CH2O) 2CH3Si (CH2) 3NH (CH2) 3SiCH3 (OCH2CH3) 2 provided by Gelest and bis [3-trimethoxysilylpropyl] ethylenediamine of formula (CH 3 O) 3 Si (CH 2) 3 NH (CH) 2 NH (CH 2) 3 Si (OCH 3) 3 provided by Gelest According to a preferred embodiment of this first embodiment, the alkoxysilane (s) comprise a substituent comprising a primary amine function, and are chosen from compounds of formula: ## STR2 ## in which the radicals R, which may be identical or different, are chosen from C1-C6 alkyl radicals and n is a an integer from 1 to 6, preferably from 2 to 4. A particularly preferred alkoxysilane according to this first embodiment of the invention is γ-aminopropyl triethoxysilane. Such a compound is for example sold under the name Z-6011 Silane by Dow Corning. According to a second embodiment of the invention, the alkoxysilane (s) is (are) chosen from compounds of the formula: R7 / R9 Si R Rio

In which:

R9 is halogen or OR'9 and R10 is halogen or OR10; at least one of the groups R9 and Rio being different from a halogen; R'9 and R'10 represent, independently of one another, hydrogen or a C1-C14 hydrocarbon group, saturated or unsaturated, linear or branched; at least one of the groups R'9 and R '10 being different from hydrogen; R7 is a non-hydrolyzable functional group with a cosmetic effect, and R8 is a non-hydrolyzable functional group carrying a functional group selected from amine, quaternary ammonium, carboxylic acid and their salts, sulphonic acid and their salts, sulphates, polyalcohol such as glycol, polyether such as polyalkylene ether, phosphoric acid and its salts. The term "cosmetic functional group" is understood to mean a group chosen from groups derived from a reducing agent, an oxidizing agent, a coloring agent, a polymer, a surfactant, an antibacterial agent, a UV filter.

Examples of groups derived from a coloring agent are, inter alia, aromatic, anthraquinone, naphthoquinone, benzoquinone, azo, xanthene, triarylmethane, azine, indoaniline, indophenolic or indoaminic nitro groups; examples of reducing groups are, inter alia, thiol groups, sulfinic acid or sulfinic acid salt. By way of example, there may be mentioned aminopropyl-N- (4,2-dinitrophenyl) amino propyl diethoxysilane. Such compounds are for example described in patent application EP 1 216 023. According to a third embodiment of the invention, the alkoxysilane (s) are chosen from compounds of formula: ## STR2 ##

wherein: R12 represents a halogen, a group OR'12, Ro; R13 represents a halogen, a group OR'13, R'o; R14 represents a halogen, a group OR '14, R "o; at least two of the groups R12, R13 and R14 being different from the groups Ro, R'oet R" o; at least one of the groups R12, R13 and R14 denoting OR'12, OR'13, or OR'14; R11 is a group chosen from groups bearing at least one functional group chosen from carboxylic acid functions and its salts, sulphonic acid and its salts, and polyalkyl ethers. Ro, R'o, R "o, R'12, R'13 and R'14 represent, independently of one another, a saturated or unsaturated, linear or branched C1-C14 hydrocarbon group optionally carrying additional chemical functions. chosen from among the carboxylic acid functions and its salts, sulphonic acid and its salts, and polyalkyl ethers, R'12, R'13 and R14 may further denote hydrogen, two at least R'12, R'13 and R groups; 14 being different from hydrogen, R'12, R'13 and R'14, Ro, R'o and R "o are preferably C1-C12 alkyl or C6-C14 aryl, C1 to C8 alkyl - C6 to C14 aryl, or C6 to C14 aryl - C1 to C6 alkyl. According to a fourth embodiment of the invention, the alkoxysilane (s) are chosen from compounds of formula:

(R21O) x (R22) ySi- (A) p- [NR23- (A ') p'] q- [NR'23- (A ") -Si- (R'22) y '(OR'21) wherein R 21, R 22, R 21 and R 22 each independently represent a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more groups selected from ether groups, ester, amine, amide, carboxyl, hydroxyl and carbonyl, x is an integer ranging from 1 to 3, y = 3-x, x 'is an integer ranging from 1 to 3, y' = 3-x ', p = 0 , p '= 0 or 1, p "= 0 or 1, q = 0 or 1, q' = 0 or 1, it being understood that at least q or q 'is different from zero, A, A' and A" each independently represent a linear divalent alkylene radical or branched C1-C20, R23 and R'23 each independently represent a hydrogen atom or a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more ether, C1-C20 alcohol ester, amine, carboxyl, alkoxysilane, C6-C30 aryl, hydroxyl or carbonyl groups, or an aromatic heterocyclic or non-heterocyclic ring optionally substituted with one or more alcohol ester groups; C3-C20, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl. As previously explained, R21, R22, R'21 and R'22 each independently represent a hydrocarbon chain. By hydrocarbon chain is preferably meant a chain having from 1 to 10 carbon atoms. Similarly, R23 and R'23 may represent a hydrocarbon chain. In this case, it is preferable to mean a chain comprising from 1 to 10 carbon atoms.

Preferably, the aromatic ring has from 6 to 30 carbon atoms. Even more preferentially, it denotes an optionally substituted phenyl radical. Preferably: R21 = R'21, R22 = R'22, x = x ', Y = Y', p = P ', A = A', q = 1, and q '= 0. The alkoxysilane (s) used according to the fourth embodiment of the invention may also have the following characteristics, taken alone or in combination: - R21, R22, R'21 a C1-C4 alkyl, and R'22, identical or different, represent - p = p '= 1 - A and A', which may be identical or different, represent a linear C1-C4 alkylene, - R23 is hydrogen. According to a fifth embodiment of the invention, the alkoxysilane (s) are chosen from compounds of formula:

(R240) x "(R25) If (E) where n (NR26R27 where

R24 and R25 each independently represent a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more groups selected from ether, ester, amine, amide, carboxyl, hydroxyl and carbonyl, 20 x "= 2 or 3, y" = 3-x "n '= O or 1, n" = 0 or 1, E and E' each independently represent a divalent linear or branched C 1 -C 20 alkylene radical, R 26 and R27 are each independently hydrogen or a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more ether groups, C1-C20 alcohol ester, amine, carboxyl, alkoxysilane, C6-C30 aryl, hydroxyl or carbonyl, or an aromatic ring, heterocyclic or not, optionally substituted with one or more alcohol ester groups C1-C20, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl, r is an integer ranging from 0 to 4, r '= 0 or 1, the R28 group or groups each independently represent hydrogen or a saturated hydrocarbon chain or unsaturated, linear or branched, preferably C1-C10, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more ether groups, C1-C20 alcohol ester, amine, carboxyl, alkoxysilane, C6 aryl -C30, hydroxyl or carbonyl, or an aromatic ring, heterocyclic or not, optionally substituted by one or more C 1 -C 20 alcohol ester, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl groups.

As previously explained, R24 and R25 each independently represent a hydrocarbon chain. By hydrocarbon chain is preferably meant a chain having from 1 to 10 carbon atoms. Similarly, R26 and R27 may represent a hydrocarbon chain. In this case, it is preferable to mean a chain comprising from 1 to 10 carbon atoms. Preferably, the aromatic ring has from 6 to 30 carbon atoms. Even more preferentially, it denotes an optionally substituted phenyl radical.

The alkoxysilane (s) used according to the fifth embodiment of the invention may have the following characteristics, taken alone or in combination: R24 is a C1-C4 alkyl; R 1 and R 27 independently represent hydrogen or a group selected from C 1 -C 4 alkyl, C 1 -C 4 hydroxyalkyl and C 1 -C 4 aminoalkyl groups.

In particular, the alkoxysilane (s) according to the fifth embodiment of the invention may be chosen from: 3- (m-aminophenoxy) propyltrimethoxysilane, of formula: O (CH 2) 3 -Si (OCH 3) 3 H 2 N - p-aminophenyltrimethoxysilane, of formula: H 2 N Si (OCH 3) 3 - N- (2-aminoethylaminomethyl) phenethyltrimethoxysilane, of the formula: (CH 3 O) 3 Si (CH 2 CH 2) NHH (CH 2) 2 NH 2 Such compounds are for example provided by According to a sixth embodiment of the invention, the alkoxysilane or alkoxysilanes are chosen from compounds of formula: (R290) xi (R30) yi Si Si (A1), where CH = O

where R29 and R30 each independently represent a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more groups selected from ether, ester, amine, amide, carboxyl, hydroxyl and carbonyl, x1 = 2 or 3, yl = 3-x1, Al represents a divalent linear or branched C1-C20 alkylene radical, optionally interrupted or substituted by one or more C1-C30 alcohol ester, amine or carboxyl groups, alkoxysilane, C 6 -C 30 aryl, hydroxyl or carbonyl, s = O or 1. As previously explained, R29 and R30 each independently represent a hydrocarbon chain. By hydrocarbon chain is preferably meant a chain having from 1 to 10 carbon atoms. The alkoxysilane (s) according to the sixth embodiment of the invention may also have the following characteristics, taken alone or in combination: R 29 and R 30 are chosen from C 1 -C 4 alkyls; C1-C4 linear alkylene. In particular, the alkoxysilane (s) used according to the sixth embodiment of the invention may be chosen from: triethoxysilylbutyraldehyde, of formula:

(CH3CH2O) 3 - Si - (CH2) 3 - CH = O

triethoxysilylundecanal, of formula: (CH 3 CH 2 O) 3 - Si - (CH 2) 10 -CH = O

triethoxysilylundecanal, ethylene glycol acetal, of formula:

The preferred compound according to the sixth embodiment of the invention is triethoxysilylbutyraldehyde. This compound is for example sold under the name SIT 8185.3 by the company GELEST. According to a particularly preferred embodiment of the invention, the alkoxysilane (s) are chosen from di- and / or trialkoxysilanes having one or more substituents comprising one or more amine functions and / or one or more aldehyde functions.

According to an even more preferred embodiment, the alkoxysilanes are chosen from tri-alkoxysilanes having a substituent comprising one or more amine functions and / or one or more aldehyde functions. Even more preferably, the alkoxysilane (s) are chosen from tri-alkoxysilanes having a substituent comprising one or more amine functions. The alkoxysilane (s) are present in the compositions according to the invention in proportions ranging, preferably, from 0.05 to 25% by weight, more preferably from 0.1 to 20% by weight and more particularly from 0.5 to 10% by weight, relative to the total weight of the composition. Preferably, the weight ratio between the total amount of copolymer (s) vinylformamide / vinylformamine on the one hand and the total amount of alkoxysilane (s) on the other hand, is between 0.1 and 20, more preferably between 0 , 5 and 10 and more preferably between 1 and 5, inclusive. The compositions according to the invention may also contain one or more fatty substances. For the purposes of the present invention, the term "fatty substance" means an organic compound which, at ambient temperature (25 ° C.) and at atmospheric pressure, is insoluble in water (that is to say, has a solubility in the water). less than 1% by weight and preferably less than 0.5% by weight), and is soluble, under the same conditions of temperature and pressure, in at least one organic solvent (for example ethanol, chloroform , or benzene) to at least 1% by weight. The fatty substances that may be used in the present invention may be chosen in particular from vegetable oils, animal oils, mineral oils, natural or synthetic oils, fatty alcohols, waxes other than fatty alcohols and mixtures thereof. As vegetable oil, there may be mentioned sweet almond oil, avocado oil, castor oil, olive oil, liquid jojoba wax, sunflower oil, wheat germ oil, sesame oil, peanut oil, grape seed oil, soybean oil, rapeseed oil, safflower oil, coconut oil , corn oil, hazelnut oil, palm oil, apricot kernel oil, calophyllum oil, evening primrose oil, shea butter, rice bran, corn germ oil, passionflower oil and rye oil. As animal oil, there may be mentioned perhydrosqualene. As mineral oil, mention may be made of paraffin oil and liquid petroleum jelly.

As synthetic oil, there may be mentioned squalane, poly (α-olefins) such as isododecane or isohexadecane, transesterified vegetable oils, fluorinated oils, fatty esters. The term "fatty esters" denotes compounds of formula RaCOORb in which Ra represents the residue of a linear or branched, hydroxylated or unsaturated, saturated or unsaturated higher acid containing from 4 to 29 carbon atoms and Rb represents a linear hydrocarbon chain or branched, saturated or unsaturated containing from 3 to 30 carbon atoms, the total number of carbon atoms of the ester being greater than 10. By way of nonlimiting examples, mention may especially be made of purcellin oil (octanoate stearyl), isopropyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-hexyldecyl laurate, palmitate of 2-octyldecyl, 2-octyldodecyl myristate, isostearyl neopentanoate or tridecyl neopentanoate.

The fluorinated oils may be partially hydrocarbon and / or silicone, for example those described in JP-A-2-295912.

Preferred fatty alcohols include, among others, myristyl, cetyl, stearyl, arachidyl, behenyl and erucyl alcohols. A wax, within the meaning of the present invention, is a lipophilic compound, solid at room temperature (about 25 ° C.), with a reversible solid / liquid state change, having a melting temperature greater than about 40 ° C. and that can go up to 200 ° C, and having in the solid state an anisotropic crystalline organization. Animal and vegetable waxes comprise, as essential components, esters of carboxylic acids and long-chain alcohols. In general, the size of the crystals of the wax is such that the crystals diffract and / or diffuse the light, conferring on the composition which comprises them a more or less opaque cloudy appearance. By bringing the wax to its melting temperature, it is possible to make it miscible with oils and to form a microscopically homogeneous mixture. As waxes, other than fatty alcohols, which may be used in the present invention, mention may be made of waxes of animal origin, such as beeswax, spermaceti, lanolin wax and lanolin derivatives; vegetable waxes such as sunflower wax, rice wax, apple wax, Carnauba wax, Candelilla wax, Ouricury wax, Japan wax, cocoa butter wax or cork fiber wax or sugar cane wax; mineral waxes, for example paraffin, petrolatum, lignite or microcrystalline waxes, ceresin or ozokerite; synthetic waxes such as polyethylene waxes, Fischer-Tropsch waxes, and mixtures thereof. The fatty substance (s) as described above, when they are present in the composition according to the invention, are preferably present in an amount ranging from 0.1 to 30% by weight, preferably from 1 to 20% by weight. by weight, and more preferably from 5 to 15% by weight, relative to the total weight of the composition. The composition according to the invention may also comprise one or more surfactants chosen from cationic surfactants, anionic surfactants, nonionic surfactants and amphoteric or zwitterionic surfactants.

The composition according to the invention then preferably comprises at least 0.01% by weight of surfactant (s), relative to the total weight of the composition. Preferably, the composition according to the invention contains from 0.01 to 20% by weight of surfactant (s), more preferably from 0.05 to 4% by weight, relative to the total weight of the composition. By way of example of anionic surfactants that may be used in the compositions according to the present invention, mention may be made in particular (nonlimiting list) of the salts (in particular the alkaline salts, in particular of sodium, the ammonium salts, the amine salts aminoalcohol salts or alkaline earth (magnesium) salts of the following compounds: alkyl sulphates, alkyl ether sulphates, alkyl amido ether sulphates, alkyl aryl polyether sulphates, monoglycerides sulphates; alkylsulfonates, alkylphosphates, alkylamidesulfonates, alkylarylsulfonates, α-olefin-sulfonates, paraffinsulfonates; alkylsulfosuccinates; alkyl ether sulfosuccinates, alkyl amide sulfosuccinates; alkylsulfosuccinamates; alkylsulfoacetates; alkyl ether phosphates, acylsarcosinates; acylisethionates and N-acyltaurates, the alkyl or acyl radical of all these different compounds preferably comprising from 12 to 20 carbon atoms, and the aryl radical preferably denoting a phenyl or benzyl group. Among the anionic surfactants that may be used, mention may also be made of fatty acid salts such as oleic, ricinoleic, palmitic and stearic acid salts; coconut oil or hydrogenated coconut oil acids; acyl lactylates whose acyl radical has 8 to 20 carbon atoms. It is also possible to use weakly anionic surfactants, such as alkyl-D-galactoside uronic acids and their salts, as well as polyoxyalkylenated (C 6 -C 24) alkyl carboxylic ether acids, polyoxyalkylenated (C 6 -C 24) aryl ether carboxylic acids, and polyoxyalkylenated alkyl (C6-C24) amino ether carboxylic acids and salts thereof, in particular those having from 2 to 50 ethylene oxide groups and mixtures thereof.

Among the anionic surfactants, it is preferred to use, according to the invention, the salts of alkyl sulphates and alkyl ether sulphates and their mixtures. The cationic surfactants that can be used in the compositions of the present invention comprise, for example, primary, secondary or tertiary fatty amine salts, optionally polyoxyalkylenated salts, quaternary ammonium salts, and mixtures thereof. As quaternary ammonium salts, mention may be made, for example, of: - those corresponding to the following general formula (I): ## STR5 ## in which R 8 to R 11 radicals, which may be identical or different, represent an aliphatic radical, linear or branched, having 1 to 30 carbon atoms, or an aromatic radical such as aryl or alkylaryl The aliphatic radicals may comprise heteroatoms such as in particular oxygen, The aliphatic radicals are, for example, chosen from C1-C30alkyl, C1-C30alkoxy, polyoxyalkylene (C2-C6), C1-C30alkylamide, (C12-C22) alkylamido (C2-C6) alkyl radicals, and the like. alkyl (C12-C22) acetate, and hydroxyalkyl C1-30; X is an anion selected from the group of halides, phosphates, acetates, lactates, alkyl (C2-C6) sulfates, alkyl- or alkylaryl-sulfonates.

Among the quaternary ammonium salts of formula (I), tetraalkylammonium chlorides, for example dialkyldimethylammonium or alkyltrimethylammonium chlorides in which the alkyl radical contains from about 12 to 22 carbon atoms, are preferred. carbon, in particular behenyltrimethylammonium, distearyl dimethylammonium, cetyltrimethylammonium, benzyldimethylstearylammonium chlorides or else palmitylamidopropyltrimethylammonium chloride or stearamidopropyldimethyl (myristyl acetate) ammonium chloride sold under the name CERAPHYL 70 by the company VAN DYK. the quaternary ammonium salts of imidazoline, for instance those of the following formula (II): embedded image in which R 12 represents an alkenyl or alkyl radical containing from 8 to 30 carbon atoms, for example derived from the fatty acids of tallow, R13 represents a hydrogen atom, a C1-C4 alkyl radical or an alkenyl or alkyl radical containing from 8 to 30 carbon atoms, R14 represents a C1-C4 alkyl radical, R15 represents a hydrogen atom; a C1-C4 alkyl radical X- is an anion selected from the group of halides, phosphates, acetates, lactates, alkylsulfates, alkyl- or alkylarylsulfonates. Preferably, R12 and R13 denote a mixture of alkenyl or alkyl radicals containing from 12 to 21 carbon atoms, for example fatty acid derivatives of tallow, R14 denotes a methyl radical, R15 denotes a hydrogen atom. Such a product is for example marketed under the name REWOQUAT W 75 20 by the company REWO; the quaternary diammonium salts of formula (III) below: embedded image in which R 16 denotes an aliphatic radical containing approximately from 16 to 30 carbon atoms ; R 17, R 18, R 19, R 20 and R 21, which are identical or different, are chosen from a hydrogen atom and an alkyl radical containing from 1 to 4 carbon atoms; and X is an anion selected from the group of halides, acetates, phosphates, nitrates and methylsulfates. Such diammonium quaternary salts include in particular propane dichloride diammonium; the quaternary ammonium salts containing at least one ester function, such as those of the following formula (IV): (C sH 2 O 5) z R 25 + N (CtH 2 O) x R 23 X- (IV) R 22 in which:

R22 is selected from C1-C6 alkyl radicals and C1-C6 hydroxyalkyl or dihydroxyalkyl radicals;

R 23 is chosen from: ## STR1 ## where R 1 is the radicals C 1 -C 22 linear or branched, saturated or unsaturated,

- the hydrogen atom,

R 25 is chosen from: ## STR2 ## the radical R 28 -C - linear or branched, saturated or unsaturated C 1 -C 6 hydrocarbon radicals R 9

- the hydrogen atom,

R24, R26 and R28, which are identical or different, are chosen from linear or branched, saturated or unsaturated C7-C21 hydrocarbon radicals r, s and t, which may be identical or different, are integers ranging from 2 to 6; y is an integer from 1 to 10;

x and z, which are identical or different, are integers ranging from 0 to 10; X-is a simple or complex anion, organic or inorganic; with the proviso that the sum x + y + z is from 1 to 15, that when x is 0 then R23 is R27 and that when z is 0 then R25 is R29. The alkyl radicals R22 may be linear or branched and more particularly linear.

Preferably, R 22 denotes a methyl, ethyl, hydroxyethyl or dihydroxypropyl radical, and more particularly a methyl or ethyl radical. Advantageously, the sum x + y + z is from 1 to 10. When R 23 is a hydrocarbon radical R 27, it can be long and have from 12 to 22 carbon atoms, or short and have from 1 to 3 carbon atoms. When R 25 is a hydrocarbon R 29 radical, it preferably has 1 to 3 carbon atoms. Advantageously, R24, R26 and R28, which are identical or different, are chosen from linear or branched, saturated or unsaturated C11-C21 hydrocarbon radicals, and more particularly from linear or branched, saturated or saturated C11-C21 alkyl and alkenyl radicals. or unsaturated. Preferably, x and z, identical or different, are 0 or 1.

Advantageously, y is equal to 1. Preferably, r, s and t, identical or different, are 2 or 3, and even more particularly are equal to 2. The anion is preferably a halide (chloride, bromide or iodide) or an alkyl sulphate more particularly methyl sulphate. However, it is possible to use methanesulphonate, phosphate, nitrate, tosylate, an anion derived from an organic acid such as acetate or lactate or any other anion compatible with ammonium with an ester function. The X- anion is even more particularly chloride or methylsulfate.

In the composition according to the invention, the ammonium salts of formula (IV) are used more particularly in which: R 22 denotes a methyl or ethyl radical, x and y are equal to 1; - zestal to 0 or 1; R, s and t are 2; - R23 is chosen from: O - the radical I I R26-C- - methyl, ethyl or hydrocarbon radicals C14-C22, the hydrogen atom;

R 25 is selected from: ## STR2 ##

- R24, R26 and R28, which are identical or different, are chosen from linear or branched, saturated or unsaturated C13-C17 hydrocarbon radicals, and preferably from linear or branched, saturated or branched C13-C17 alkyl and alkenyl radicals; unsaturated.

Advantageously, the hydrocarbon radicals are linear.

There may be mentioned, for example, the compounds of formula (IV) such as the salts (especially chloride or methylsulfate) of diacyloxyethyl-dimethylammonium, of diacyloxyethyl-hydroxyethyl-methylammonium, of

monoacyloxyethyl-dihydroxyethyl-methylammonium, triacyloxyethyl-methylammonium, monoacyloxyethyl-hydroxyethyldimethylammonium and mixtures thereof. The acyl radicals preferably have from 14 to 18 carbon atoms and come more particularly from a vegetable oil such as palm oil or sunflower oil. When the compound contains more than one acyl radical, the latter may be identical or different.

These products are obtained, for example, by direct esterification of triethanolamine, triisopropanolamine, alkyldiethanolamine or alkyldiisopropanolamine optionally oxyalkylenated on fatty acids or mixtures of fatty acids of plant or animal origin, or by transesterification. of their methyl esters. This esterification is followed by quaternization using an alkylating agent such as an alkyl halide (preferably methyl or ethyl), a dialkyl sulphate (preferably methyl or ethyl), the methyl methanesulfonate, methyl para-toluenesulfonate, glycol or glycerol chlorohydrin. Such compounds are for example sold under the names DEHYQUART by Henkel, STEPANQUAT by STEPAN, NOXAMIUM by CECA, REWOQUAT WE 18 by REWO-WITCO. The composition according to the invention may contain, for example, a mixture of quaternary ammonium mono-, di- and triester salts with a majority by weight of diester salts.

As a mixture of ammonium salts, it is possible to use, for example, the mixture containing 15 to 30% by weight of acyloxyethyl-dihydroxyethyl-methylammonium methylsulfate, 45 to 60% of diacyloxyethyl-hydroxyethyl-methylammonium methylsulfate and 15 to 30% of triacyloxyethylmethylammonium methylsulfate, the acyl radicals having from 14 to 18 carbon atoms and coming from partially hydrogenated palm oil. It is also possible to use the ammonium salts containing at least one ester function described in US-A-4874554 and US-A-4137180.

The nonionic surfactants that can be used in the compositions of the present invention are well-known compounds per se (see in particular in this connection "Handbook of Surfactants" by MR PORTER, Blackie & Son editions (Glasgow and London), 1991, pp. 116- 178). They are chosen in particular from polyethoxylated, polypropoxylated or polyglycerolated alcohols and fatty alcohols, polyethoxylated, polypropoxylated or polyglycerolated alpha-diols, polyethoxylated, polypropoxylated or polyglycerolated alkyl (C 1 -C 20) phenols or polyethoxylated, polypropoxylated or polyglycerolated fatty acids, fatty chain. comprising, for example, from 8 to 18 carbon atoms, the number of ethylene oxide or propylene oxide groups can range from 2 to 50 and the number of glycerol groups can range from 2 to 30. It can also be cited condensates of ethylene oxide and propylene oxide on fatty alcohols; the polyethoxylated fatty amides preferably having from 2 to 30 ethylene oxide units, the polyglycerolated fatty amides comprising on average from 1 to 5 glycerol groups and in particular from 1.5 to 4, the esters of fatty acids and of ethoxylated sorbitan having from 2 to 30 ethylene oxide units, sucrose fatty acid esters, polyethylene glycol fatty acid esters, alkylpolyglycosides, polyethoxylated vegetable oils, N- (lower alkyl) derivatives, C6_24) glucamine, amine oxides such as (C1-C14 alkyl) amine oxides or N- (C1-C14 acyl) aminopropylmorpholine oxides.

The amphoteric or zwitterionic surfactants that may be used in the compositions of the present invention comprise, for example, secondary or tertiary aliphatic amine derivatives, in which the aliphatic group is a linear or branched chain containing from 8 to 22 carbon atoms and containing at least one anionic group such as, for example, a carboxylate, sulfonate, sulfate, phosphate or phosphonate group. Mention may also be made of (C 8-20) alkyl betaines, sulphobetaines, (C 8-20 alkyl) amido (C 6-18) alkyl betaines or (C 8-20 alkyl) amido (C 6-18 alkyl) sulphobetaines. Among the amine derivatives, mention may be made of the products sold under the name MIRANOL, as described in patents US 2,528,378 and US 2,781,354 and classified in the CTFA dictionary, 3rd edition, 1982, under the names Amphocarboxyglycinate and Amphocarboxypropionate of respective structures (1) and (2): Ra-CONHCH2CH2-N (Rb) (Re) (CH20OO-) (1) in which: Ra represents an alkyl group derived from an acid Ra-OOOH present in the hydrolyzed coconut oil, a heptyl, nonyl or undecyl group, Rb represents a beta-hydroxyethyl group, and Re represents a carboxymethyl group; and Ra'-CONHCH2CH2-N (B) (B ') (2) wherein: B is -CH2CH2OX', B 'is - (CH2) z-Y', where z = 1 or 2, X 'is the group -CH2CH2-COOH or a hydrogen atom, Y 'represents -COOH or the group -CH2-CHOH-SO3H, Ra' represents an alkyl group of an acid Ra'-COOH present in coconut oil or in the hydrolyzed linseed oil, an alkyl group, especially C17 and its iso form, an unsaturated C17 group. These compounds are classified in the CTFA dictionary, 5th edition, 1993, under the names cocoamphodiacétate disodium, lauroamphodiacétate disodium, caprylamphodiacétate disodium, capryloamphodiacétate disodium, cocoamphodipropionate disodium, lauroamphodipropionate disodium, caprylamphodipropionate disodium, capryloamphodipropionate disodium, acid lauroamphodipropionic, cocoamphodipropionic acid. By way of example, mention may be made of cocoamphodiacetate sold by RHODIA under the trade name MIRANOL C2M Concentrate.

The compositions according to the invention may also contain one or more thickening agents, which may be chosen from natural or synthetic, anionic, amphoteric, zwitterionic, nonionic or cationic, associative or non-associative polymeric thickeners, and non-polymeric thickeners such as by example an electrolyte or a sugar. Polymeric thickeners include, for example, cellulosic thickeners, for example hydroxyethylcellulose, hydroxypropylcellulose and carboxymethylcellulose, guar gum and its derivatives, for example hydroxypropyl guar, marketed by Rhodia under the reference Jaguar. HP 105, gums of microbial origin, such as xanthan gum and scleroglucan gum, synthetic polymeric thickeners such as crosslinked homopolymers of acrylic acid or acrylamidopropanesulfonic acid, for example Carbomer, associative polymers nonionic, anionic or amphoteric, such as the polymers sold under the names Pemulen TRI or TR2 by the company Goodrich, SALCARE SC90 by the company ALLIED COLLOIDS, ACULYN 22, 28, 33, 44 or 46 by the company ROHM & HAAS and ELFACOS T210 and T212 by the company AKZO. The compositions according to the invention may also comprise one or more silicones in soluble, dispersed or micro-dispersed form. The silicones are then preferably present in an amount ranging from 0.01 to 10% by weight, and more preferably from 0.1 to 5% by weight, relative to the total weight of the composition. By way of example, mention may be made especially of silicone oils, such as, for example, linear or cyclic polydimethylsiloxanes.

The compositions in accordance with the invention may be packaged for example in a jar, in a tube, in a pump bottle, or in an aerosol device that is usual in cosmetics. The compositions according to the invention may, when they are intended to be packaged in an aerosol type device, contain one or more propellants. The propellant may then be chosen, for example, from dimethyl ether, C3-C5 alkanes, halogenated hydrocarbons, and mixtures thereof. The compositions according to the invention may further contain one or more additives chosen from pearlescent agents; opacifying agents; plasticizers; solar filters; the perfumes ; dyes; conservatives ; pH stabilizers; acids; the basics ; polyols (for example glycols); mineral charges; glitter, and any other additive conventionally used in the cosmetic field. Those skilled in the art will take care to choose the possible additives and their amounts so that they do not adversely affect the properties of the compositions of the present invention.

These additives may be present in the composition according to the invention in an amount ranging from 0 to 50% by weight relative to the total weight of the composition. The compositions according to the invention may be present inter alia in the form of more or less thickened liquids, gels, creams, pastes or foams. Preferably, they are in the form of lotions or gels. According to the invention, the alkoxysilane (s) may optionally react with the vinylformamide / vinylformamine copolymer (s). This is why these two ingredients can be packaged separately, the composition according to the invention then being in the form of a two-part composition, intended to be mixed at the time of use.

Thus, the subject of the present invention is also a two-part cosmetic composition, comprising: a first part comprising, in a cosmetically acceptable medium, one or more alkoxysilanes as described above, and a second part comprising, in a cosmetically acceptable medium, one or more vinylformamide / vinylformamine copolymers as described above, which comprises: from 10 to 95 mol% of units of the following formula A: CH 2 CH (A) and from 90 to 5 mol% The above description of the various ingredients of the one-part composition according to the invention also relates to the two-part composition, which ingredients may be present in the composition of the invention. either of the two parts with the exception of the alkoxysilane (s) and the vinylformamide / vinylformamine copolymer (s) which are packaged separately. Likewise, the above description of the contents and weight ratios of the various ingredients, including the alkoxysilane (s) and the vinylformamide / vinylformamine copolymer (s), also apply to the two-part composition, it being understood that these contents and weight ratios apply to the final composition obtained after mixing the two parts. Moreover, the two-part composition according to the invention can be packaged in a multi-compartment device or kit. The present invention therefore also relates to a device comprising at least two compartments, a first compartment of which contains a first composition comprising, in a cosmetically acceptable medium, one or more alkoxysilanes as described above, and a second compartment contains a second composition comprising in a cosmetically acceptable medium, one or more vinylformamide / vinylformamine copolymers as described above. The composition according to the invention can be advantageously used for the cosmetic treatment of the hair. In particular, it can be used for styling hair, for example for shaping and / or fixing the hairstyle. According to a particularly preferred embodiment, it is used for the simultaneous styling and conditioning of the hair. The present invention also relates to a cosmetic hair treatment method, for example a hair care method, or a method of shaping and / or maintaining the hairstyle, which consists in applying to the hair an effective amount of a hair. composition according to the invention as described above, then to perform a possible rinsing after a possible exposure time. Preferably, the composition according to the invention is not rinsed.

The following examples are illustrative of the present invention.

EXAMPLES In the following examples, all amounts are indicated as percent by weight of active ingredient (MA) based on the total weight of the composition, unless otherwise indicated.

Example 1

This example illustrates the formulation of a styling lotion according to the invention. Such a lotion was prepared from the ingredients indicated in the table below: Ingredients Vinylformamide / vinylformamine copolymer (1) 3% y-aminopropyl triethoxysilane (2) 1% HC1 gs pH = 8 Demineralized water qs 100% ( 1) marketed under the name Lupamine 9030 by the company BASF. (2) sold under the name Z-6011 Silane by Dow Corning.

The application of this lotion on straight or supple hair followed by blow-drying brings volume to the hair and a good styling effect, while providing a particularly soft touch of the hair. The regular use of such a lotion on fine hair makes it possible to obtain a texturizing effect, that is to say, to confer on the fine hair the behavior of normal hair which is less fine notably in terms of ease of styling, maintenance and outfit.

Example 2

This example illustrates the formulation of a two-part styling gel according to the invention. Such a gel was prepared from the ingredients indicated in the two tables below: Part A: Ingredients Content Vinylformamide / vinylformamine copolymer (1) 3% Hydroxypropylcellulose (3) 1% Demineralized water qs 100% (1) marketed under the LUPAMIN 9030 denomination by the company BASF. (3) marketed under the name KLUCEL G by AQUALON / HERCULES.

Part B: Ingredients Content Triethoxysilylbutyraldehyde (4) 2% Hydroxypropylcellulose (3) 1% Ethanol 25% Demineralized water qs 100% (3) sold under the name KLUCEL G by AQUALON / HERCULES. (4) sold under the name SIT 8185.3 by the company 25 GELEST. For example, parts A and B may be packaged in a two compartment or kit device. Before use, parts A and B are mixed in equal-thickness proportions. This gives a gel providing a high fixation, and durable over time. For example, this gel is particularly suitable for making hairstyles with locks on short hair, with a very good behavior over time. Comparative Example 3

The following two compositions were made: Composition 1 Composition 2 (Invention) (Excluding the invention) Polyvinylformamide hydrolyzed at 5% ai - 30% (1) PolyN-vinylformamide (2) - 5% ma 3-aminopropyltriethoxysilane (3) 10% ai 10% demineralized water Qspl00 Qspl00 (1) sold under the name Lupamine 9030 by the company BASF (2) sold under the name Lupamine 9000 by the company BASF 20 (3) marketed by the company Flukka

The two preceding compositions were applied, at the rate of 1 g of formulation per wick, on wicks of wet brown hair of 2.7 g previously shampooed, rinsed and wrung out. Finally, the rinseless locks were then dried under a helmet for 30 minutes and then unraveled.

A panel of 7 testers evaluated the plixant of the hair (stiffness of the lock) treated with the compositions 1 and 2 by classifying them according to this criterion: row 1 for the lock with the hair presenting the most important plixant, rank 2 for the wick with hair having the least important plixant. The 7 evaluators found a more important leveler with composition 1 according to the invention. The sum of the ranks obtained for each composition is: 7 for composition 1, 14 for composition 2 According to the KRAMER test (A non parametric ranking method for Senses and Flavor (1974) 121-123), two compositions are significantly different at the 5% threshold if the sum of the ranks is outside the 8 to 13 range. at the interval 8-13, the plixant is significantly greater with the composition 1 according to the invention.

Claims (38)

A cosmetic composition comprising, in a cosmetically acceptable medium - one or more alkoxysilanes, and one or more vinylformamide / vinylformamine copolymers comprising: from 10 to 95 mol% of units of the following formula: ## STR2 ## 90 to 5 mol% of units of the following formula: ## STR2 ## 2. Composition according to claim 1, characterized in that the vinylformamide / vinylformamine copolymer or copolymers comprise from 10 to 60 mol% of unit of formula A. 3. Composition according to the preceding claim, characterized in that the vinylformamide / vinylformamine copolymer or copolymers comprise from 20 to 40 mol% of unit of formula A. 4. Composition according to any one of the preceding claims, characterized in that the vinylformamide / vinylformamine copolymer or copolymers comprise one or more additional monomer units, the latter representing less than 20 mol% of the copolymer. 5. Composition according to any one of claims 1 to 3, characterized in that the vinylformamide / vinylformamine copolymer or copolymers consist solely of units of formula A and of units of formula B. 6. Composition according to any one of the preceding claims, characterized in that the vinylformamide / vinylformamine copolymer or copolymers are present in proportions ranging from 0.1 to 25% by weight, relative to the total weight of the composition. 7. Composition according to the preceding claim, characterized in that the vinylformamide / vinylformamine copolymer or copolymers are present in proportions ranging from 0.5 to 20% by weight, relative to the total weight of the composition. 8. Composition according to any one of the preceding claims, characterized in that the alkoxysilane (s) contain a single silicon atom. 9. Composition according to any one of the preceding claims, characterized in that the alkoxysilanes are of formula (G) 4_XSi (OR) X, with x denoting an integer ranging from 1 to 3, G denoting identical monovalent groups. or different and R denoting a monovalent hydrocarbon radical comprising one or more carbon atoms and optionally one or more heteroatoms. 10. Composition according to the preceding claim, characterized in that the alkoxysilane (s) contain two or three alkoxy functional groups. 11. Composition according to any one of claims 9 or 10, characterized in that the alkoxysilane (s) comprise one or more solubilizing functional groups, chosen from the groups primary amine, secondary amine, aromatic amine, alcohol, carboxylic acid, sulphonic acid. , anhydride, carbamate, urea, guanidine, aldehyde, ester, amide, epoxy, pyrrole, dihydroimidazole, gluconamide, pyridyl and polyether. 12. Composition according to any one of the preceding claims, characterized in that the alkoxysilane or alkoxysilanes are chosen from compounds of formula: in which: R4 represents a halogen, a group OR 'or R'1; R5 is halogen, OR "or R'2, R6 is halogen, OR" or R'3; R1, R2, R3, R ', R ", R"', R'1, R'2, R'3 represent, independently of one another, a saturated or unsaturated hydrocarbon group, linear or branched, optionally bearing groups R1, R2, R ', R "and R"' may further denote hydrogen, at least two of R4, R5 and R6 respectively designating OR ', OR' or OR ', with at least two groups R ', R "and R"' being different from hydrogen. 13. The composition as claimed in any one of claims 1 to 11, characterized in that the alkoxysilane (s) are chosen from compounds of formula: ## STR1 ## in which: R 9 represents a halogen or an OR 9 group and R10 represents a halogen or a group OR '10; at least one of the groups R9 and R10 being different from a halogen; R'9 and R'10 represent, independently of one another, hydrogen or a C1-C14 hydrocarbon group, saturated or unsaturated, linear or branched; at least one of the groups R'9 and R'10 being different from hydrogen; R7 is a non-hydrolyzable functional group with a cosmetic effect, chosen from groups derived from a reducing agent, an oxidizing agent, a coloring agent, a polymer, a surfactant, an antibacterial agent, a UV filter; and R8 is a non-hydrolyzable functional group carrying a function selected from amine, quaternary ammonium, carboxylic acid and their salts, sulphonic acid and their salts, sulphates, polyalcohol such as glycol, polyether such as polyalkylene ether, phosphoric acid and its salts. 14. Composition according to any one of claims 1 to 11, characterized in that the alkoxysilane (s) are chosen from the compounds of formula: ## STR2 ## in which: R 12 represents a halogen, a group OR '12, Ro; R13 represents a halogen, a group OR'13, R'o; R14 represents a halogen, a group OR'14, R "o; at least two of the groups R12, R13 and R14 being different from the groups Ro, R'oet R" o; at least one of R12, R13 and R14 denoting OR'12, OR'13, or OR'14; R11 is a group chosen from groups bearing at least one functional group chosen from carboxylic acid functions and its salts, sulphonic acid and its salts, and polyalkyl ethers. Ro, R'o, R "o, R'12, R'13 and R'14 represent, independently of one another, a saturated or unsaturated, linear or branched C1-C14 hydrocarbon group optionally carrying additional chemical functions. chosen from among the carboxylic acid functions and its salts, sulphonic acid and its salts, and polyalkyl ethers, R'12, R'13 and R14 may further denote hydrogen, two at least R'12, R'13 and R groups; 14 being different from hydrogen. 15. Composition according to any one of claims 1 to 11, characterized in that the alkoxysilane (s) are chosen from compounds of formula: (R210) x (R22) ySi- (A) p- [NR23- (A ') ) p '] q- [NR'23- (A ") p"] q'-Si- (R'22) y' (OR'21) X 'where R21, R22, R'21 and R'22 represent each independently a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more groups selected from ether, ester, amine, amide, carboxyl, hydroxyl and carbonyl groups, x is a integer varying from 1 to 3, y = 3-x, x 'is an integer varying from 1 to 3, y' = 3-x ', p = 0, p' = 0 or 1, p "= 0 or 1, q = 0 or 1, q '= 0 or 1, it being understood that at least q or q' is different from zero, A, A 'and A "each independently represent a divalent linear or branched C1-C20 alkylene radical, R23 and R'23 each independently represent a hydrogen atom or a hydrocarbon chain saturated or unsaturated, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more ether groups, C1-C20 alcohol ester, amine, carboxyl, alkoxysilane, C6-C30 aryl, hydroxyl or carbonyl, or an aromatic ring, heterocyclic or not, optionally substituted with one or more C 3 -C 20 alcohol ester groups, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl. 16. Composition according to any one of claims 1 to 11, characterized in that the alkoxysilane (s) are chosen from compounds of the formula: (R240) x "(R25) Si (E) n (0) r Wherein R24 and R25 each independently represent a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more groups selected from ether, ester, amine groups. , amide, carboxyl, hydroxyl and carbonyl, x "= 2 or 3, y" = 3-x ", n '= O or 1, n" = 0 or 1, E and E' each independently represent a divalent linear alkylene radical or branched C1-C20, R26 and R27 each independently represent hydrogen or a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more ether groups, ester of C1-C20 alcohol, amine, carboxyl, alkoxysilane, C6-C30 aryl, hydroxyl or carbonyl, or an aromatic ring, heterocyclic or not, optionally substituted with one or more C1-C20 alcohol ester groups, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl, r is an integer ranging from 0 to 4, r '= 0 or 1, the group or groups R28 each independently represent hydrogen or a saturated or unsaturated hydrocarbon chain, linear or branched, preferably C 1 -C 10, optionally containing one or more heteroatoms, optionally interrupted or substituted by one or more ether groups, C 1 -C 20 alcohol ester, amine, carboxyl, alkoxysilane, C 6 -C 30 aryl , hydroxyl or carbonyl, or an aromatic ring, heterocyclic or not, optionally substituted by one or more C 1 -C 20 alcohol ester, amine, amide, carboxyl, alkoxysilane, hydroxyl, carbonyl or acyl groups. 17. A composition according to any one of claims 1 to 11, characterized in that the alkoxysilane (s) are chosen from the compounds of formula: (R 29 O) xi (R 30) y Si Si (A1), where CH = O where R29 and R30 each independently represent a saturated or unsaturated hydrocarbon chain, linear or branched, optionally containing one or more heteroatoms, optionally interrupted or substituted with one or more groups selected from ether, ester, amine, amide, carboxyl, hydroxyl and carbonyl groups; , xi = 2 or 3, yi = 3-xi, Al represents a linear or branched C1-C20 alkylene divalent radical, optionally interrupted or substituted by one or more C1-C30 alcohol ester, amine, carboxyl or alkoxysilane groups; C 6 -C 30 aryl, hydroxyl or carbonyl, s = O or 1. 18. Composition according to any one of the preceding claims, characterized in that the alkoxysilane (s) are chosen from di- and / or tri-alkoxysilanes having one or more substituents comprising one or more amine functions and / or one or more aldehyde functions. 19. Composition according to any one of the preceding claims, characterized in that the alkoxysilane (s) are present in proportions ranging from 0.05 to 25% by weight, relative to the total weight of the composition. 20. Composition according to the preceding claim, characterized in that the alkoxysilanes are present in proportions ranging from 0.1 to 20% by weight, relative to the total weight of the composition. 21. Composition according to any one of the preceding claims, characterized in that the weight ratio between the total amount of vinylformamide / vinylformamine copolymer (s) on the one hand and the total amount of alkoxysilane (s) on the other hand, is between 0.1 and 20, inclusive. 22. Composition according to any one of the preceding claims, characterized in that the cosmetically acceptable medium comprises water and / or one or more cosmetically acceptable solvents chosen from C1-C4 lower alcohols; polyols; polyol ethers; C5-C10 alkanes; C3.4 ketones; C1-C4 alkyl acetates; dimethoxyethane, diethoxyethane; and their mixtures. 23. Composition according to any one of the preceding claims, characterized in that it also contains one or more fatty substances, chosen from vegetable oils, animal oils, mineral oils, natural or synthetic oils, fatty alcohols, waxes other than fatty alcohols and mixtures thereof. 24. Composition according to the preceding claim, characterized in that the fat or fats are present in an amount ranging from 0.1 to 30% by weight, relative to the total weight of the composition. 25. Composition according to any one of the preceding claims, characterized in that it also contains one or more surfactants, selected from cationic surfactants, anionic surfactants, nonionic surfactants, amphoteric or zwitterionic surfactants. 26. Composition according to the preceding claim, characterized in that it contains at least 0.01% by weight of surfactant (s), relative to the total weight of the composition. 27. Composition according to the preceding claim, characterized in that it contains from 0.01 to 20% by weight of surfactant (s), relative to the total weight of the composition. 28. Composition according to any one of the preceding claims, characterized in that it further comprises one or more thickening agents. 29. Composition according to any one of the preceding claims, characterized in that it further comprises one or more propellants. 30. Composition according to any one of the preceding claims, characterized in that it further comprises one or more silicones. 31. Composition according to any one of the preceding claims, characterized in that it further contains one or more additives chosen from pearlescent agents; opacifying agents; plasticizers; solar filters; the perfumes ; dyes; conservatives ; pH stabilizers; acids; the basics ; polyols; mineral charges; glitter, and any other additive conventionally used in the cosmetic field. 32. Composition according to any one of the preceding claims, characterized in that it is in the form of more or less thickened liquid, gel, cream, paste or foam. 33. A two-part cosmetic composition comprising: a first part comprising, in a cosmetically acceptable medium, one or more alkoxysilanes, and a second part comprising, in a cosmetically acceptable medium, one or more vinylformamide / vinylformamine copolymers, which comprises: from 10 to 95 mol% of units of the following formula A: ## STR2 ## and from 90 to 5 mol% of units of the following formula: ## STR2 ## 34. Device comprising at least two compartments, a first compartment of which contains a first composition comprising, in a cosmetically acceptable medium, one or more alkoxysilanes, and a second compartment contains a second composition comprising, in a cosmetically acceptable medium, one or more copolymers vinylformamide / vinylformamine according to claim 33. 35. A method of cosmetic hair treatment, characterized in that it consists in applying to the hair an effective amount of a composition according to any one of claims 1 to 33, then to carry out a possible rinsing after a possible time of pose. 36. Process according to the preceding claim, characterized in that the composition is not rinsed. 37. Use of a composition according to any one of claims 1 to 33 for shaping and / or fixing the hairstyle. 38. Use of a composition according to any one of claims 1 to 33, for the simultaneous styling and conditioning of hair. 44