WO2008104696A2

WO2008104696A2 - Polymer particle dispersion, composition containing the same and cosmetic treatment method

Info

Publication number: WO2008104696A2
Application number: PCT/FR2008/050211
Authority: WO
Inventors: Nathalie Mougin; Gwenaëlle JEGOU
Original assignee: L'oreal
Priority date: 2007-02-19
Filing date: 2008-02-12
Publication date: 2008-09-04
Also published as: WO2008104696A3; FR2912648A1; FR2912648B1

Abstract

The invention relates to new dispersions of particles of a surface-stabilised polymer in a non-aqueous medium, in which the polymer essentially comprises hydrophilic monomers. The invention also relates to a cosmetic or pharmaceutical composition containing said dispersion in a cosmetically or pharmaceutically acceptable medium. The invention further relates to a method for the cosmetic treatment of keratinic materials using said composition.

Description

Dispersion of polymer particles, composition comprising it and cosmetic treatment method

The present invention relates to a novel dispersion of very particular polymer particles dispersed in a non-aqueous medium, as well as to compositions, in particular cosmetic or pharmaceutical compositions comprising said dispersion.

Among the polymers used in the cosmetics field, and more particularly in the hair field, mention may be made of cationic polymers such as those based on dimethyldiallylammonium chloride, especially known for protecting and / or beautifying the hair, thanks to their strong substantivity. However, no effect of shaping of the hair during the use of this type of polymer is observed. Moreover, their incompatibility with most propellants does not allow them to be used in aerosol products such as lacquers.

EP1323753 discloses hair compositions comprising aqueous dispersions of cationic hydrophobic polymers which provide styling properties, for example when they are used in shampoos. However, these compositions do not have a very good cosmetic in a humid environment, particularly as and when shampooing applications. In order to obtain a good styling effect while preserving the compositions with acceptable cosmetic properties, polymers possessing styling properties, conveyed in a cosmetic solvent, have been proposed. Thus, in WO91 / 15185 and WO98 / 18433, there are provided cosmetic compositions comprising hydrophobic or non-water-soluble polymers, conveyed in solution in an organic solvent. However, the need to employ soluble polymers in an organic medium implies a low variability of the available chemical structures. Furthermore, it has been found that the organic solutions of hydrophobic polymers generally have a high viscosity, related to the polymer content of the solution, which makes it difficult to subsequently formulate these polymers and their solutions.

It is moreover known to use, in cosmetics, dispersions of polymer particles, generally of nanometric size, in organic media, and in particular, by EP749747, nonaqueous dispersions of polyacrylate or polymethylmethacrylate particles, in a non-volatile paraffin oil or in isododecane, for example. However, these dispersions do not make it possible to obtain satisfactory cosmetic properties, especially in terms of styling effect and disentangling. Moreover, the touch of the compositions comprising them may be unsatisfactory, especially as regards softness.

The Applicant has surprisingly discovered new dispersions of polymer particles, stabilized by stabilizers, in non-aqueous media, which make it possible to provide the desired cosmetic properties (feel, softness, disentangling) while improving the styling properties. . The subject of the invention is therefore a dispersion of particles of at least one ethylene polymer stabilized at the surface by a stabilizing agent, in a non-aqueous medium consisting of at least one non-aqueous compound, liquid at 25 ° C., having a parameter overall solubility according to the HANSEN solubility space less than or equal to 20 (MPa) ^1/2 , or a mixture of such compounds; characterized in that said ethylenic polymer comprises from 50 to 100% by weight of hydrophilic monomer of log p less than or equal to 0.5, or a mixture of such monomers, relative to the total weight of monomers.

The subject of the invention is also a cosmetic or pharmaceutical composition comprising, in a cosmetically or pharmaceutically acceptable medium, at least one dispersion as defined above.

The invention makes it possible to prepare easily transportable polymers, since the dispersions have low viscosities, which facilitates their implementation in cosmetic compositions.

In the hair field, these compositions make it possible to impart volume and hold to the hair. In addition, these dispersions or compositions comprising them provide interesting properties, in particular in rinsed mode. They make it possible to obtain, in addition to the styling effects and the hold, a soft and non-sticky feel, a good softness, as well as an easy disentangling of the hair, in a dry and / or wet environment. These polymers can also be used in so-called "non-rinsed" type lacquer or styling gels / mousses, and bring, in addition to styling, cosmetic hair (touch, softness, smoothing, disentangling).

In the field of makeup, these compositions provide increased comfort properties, including improved slipperiness, especially in a humid environment. In addition, the polymers have resistance and resistance to external aggressions, including friction (meals) important. Comfort and holding are improved. In the case of lipsticks, the use of saliva on the lips may permit swelling, or volume, which has a repulsive effect; the wet film thus created on the surface protects the deposit and gives a 'wet' gloss.

Another advantage of the invention lies in the fact that the polymer particles can be of very small size, in particular nanometric, which is not the case with, for example, other types of particles such as microspheres of which the diameter is generally greater than 1 micron. However, a large size of the order of a micron has the disadvantage of causing a certain visibility of the particles to the eye, when they are in a composition and when they are applied to the skin, and poor stability of composition, especially in time. Thus, the dispersions according to the invention make it possible to obtain stable compositions, which can moreover be transparent, translucent or opaque, depending on the size of the polymer particles dispersed therein.

The dispersions according to the invention therefore consist of particles, generally spherical, of at least one ethylene polymer, stabilized on the surface with a stabilizer, in a non-aqueous medium.

The dispersions according to the invention may especially be in the form of polymer nanoparticles in stable dispersion in a non-aqueous medium. The nanoparticles are preferably 5 to 600 nm in size, especially 10 to 500 nm, more preferably 15 to 450 nm, since particle dispersions become much less stable beyond about 600 nm. . In particular, these particles remain in the form of elementary particles, without forming agglomerates, when they are dispersed in said non-aqueous media.

By "ethylenic" polymer is meant a polymer obtained by polymerization of at least 2 monomers, identical or different, comprising ethylenic unsaturation. Said ethylene polymer may be chosen by those skilled in the art depending on its properties, according to the desired subsequent application for the composition. These polymers may in particular be crosslinked.

The polymers according to the invention may be homopolymers or copolymers linear, branched, grafted, or even stars. They can be statistical or alternating. Preferably, they are linear random copolymers.

The ethylene polymer according to the invention comprises from 50 to 100% by weight of hydrophilic monomer, or a mixture of such monomers, relative to the total weight of monomers.

It preferably comprises from 51 to 99.9% by weight, better still from 53 to 99% by weight, and even from 55 to 98% by weight, in particular from 60 to 95% by weight, preferably from 65 to 85% by weight of hydrophilic monomer, alone or as a mixture, based on the total weight of initial monomers.

The hydrophilic monomers are preferably monofunctional, that is to say they preferably comprise only one polymerizable function, especially vinyl.

For the purposes of the present invention, the term "hydrophilic monomer" is intended to mean a monomer having a logarithmic value of the octanol-1 / water apparent partition coefficient, also called log p, less than or equal to 0.5, for example between - 10 and 0.5, preferably between -8 and 0, and especially between -6 and -0.5. When the monomer is a macromonomer, that is to say a prepolymer comprising, generally located at at least one end, a reactive polymerizable group which allows said macromonomer to react as a monomer, said macromonomer is considered a "hydrophilic monomer" within the meaning of the invention when the repeating units constituting it have a log p less than or equal to 0.5, for example between -10 and 0.5, preferably between -8 and 0, and especially between -6 and -0.5.

When the macromonomer is a copolymer, that is to say comprises different repeating units, it is considered to be a hydrophilic monomer within the meaning of the invention if at least 50% by weight, preferably at least 75% by weight said repetitive units have a log p less than or equal to 0.5, the% being based on the total weight of the repetitive units.

The log p values are known and are determined according to a standard test that determines the concentration of the monomer in octanol-1 and water. In particular, the values can be calculated using the Advanced Chemistry Development (ACD) software Solaris V4.67; they can also be obtained from Exploring QSAR: hydrophobic, electronic and steric constants (ACS professional reference book, 1995).

There is still a website that provides estimated values (address: https://esc.syrres.com/interkow/kowdemo.htm).

We indicate below the value of the log p, determined using the ACD software, of some repetitive units usually constituting macromonomers:

Among the macromonomers capable of constituting hydrophilic monomers, mention may be made, alone or as a mixture, of the monomers of formula (I):

in which :

- R1 is a hydrogen atom or a hydrocarbon radical, linear or branched type CpH ₂ _p i, with p being an integer between 1 and 12 inclusive;

Z is a divalent group chosen from -COO-, -CONH-, -CONCH ₃ -, -OCO-, -O-, -SO ₂ - -CO-O-CO- or -CO-CH ₂ -CO-;

- x is 0 or 1;

R2 is a divalent carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which can comprise 1 to 18 heteroatoms chosen from O, N, S, F, Si and P;

m is 0 or 1;

n is an integer between 3 and 300 inclusive;

- R3 is a hydrogen atom or a carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which may comprise 1 to 20 heteroatoms selected from O, N, S, F, Si and P; and their salts.

In particular, R 1 may represent a methyl, ethyl, propyl or butyl radical. Preferably, R 1 represents hydrogen or a methyl radical. Preferably Z represents COO or CONH.

Preferably, x is 1.

In the radical R2, the heteroatom (s), when present, may be intercalated in the chain of said radical R2, or said radical R2 may be substituted by one or more groups including them such as hydroxy, amino (NH 2, NHR ' or NR'R "with R 'and R" identical or different representing a linear or branched C1-C22 alkyl, in particular methyl or ethyl), -CF3, -CN, -SO3H or -COOH.

In particular, R2 can comprise a group -O-, -N (R) -, -CO- and their combination, and especially -O-CO-O-, -CO-O-, -N (R) CO-; -O-CO-NR-, -NR-CO-NR-, with R representing H or a linear or branched C1-C22 alkyl, optionally comprising 1 to 12 heteroatoms chosen from O, N, S, F, Cl, Br , Si and P.

In particular R2 can be:

an alkylene radical having 1 to 20 carbon atoms, such as methylene, ethylene, n-propylene, isopropylene, n-butylene, isobutylene, tert-butylene, pentylene, isopentylene, n-hexylene, isohexylene, heptylene, isoheptylene, n- octylene, isooctylene, nonylene, isononylene, decylene, isodecylene, n-dodecylene, isododecyl, tridecylene, n-tetradecylene, hexadecylene, n-octadecylene, docosanylene, arachinylene;

a cycloalkylene radical having 5 to 10 carbon atoms, which may or may not be substituted, such as cyclopentylene, cyclohexylene, cycloheptylene, cyclooctyl, cyclononylene or cyclodecylene;

- a phenylene radical -C ₆ H ₄ - (ortho, meta or para) optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms selected from O, N, S, F, Si and P;

a benzylene radical -C ₆ H ₄ -CH ₂ - optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F,

Si and P;

a radical of formula -CH ₂ -O-CO-O-, CH ₂ -CH ₂ -O-CO-O-, -CH ₂ -CO-O-, -CH ₂ -CH ₂ -CO-O-, -CH ₂ -O-CO-NH-, -CH ₂ -CH ₂ -O-CO-NH-; -CH ₂ -NH-CO-NH-, -CH ₂ -CH ₂ -NH-CO-NH-; -CH ₂ -CHOH-, -CH ₂ -CH ₂ -CHOH-, -CH ₂ -CH ₂ -CH (NH ₂ ) -, -CH ₂ -CH (NH ₂ ) -, - CH ₂ -CH ₂ -CH (NHR ') -, -CH ₂ -CH (NHR') -, -CH ₂ -CH ₂ -CH (NR ¹ R ") -, -CH ₂ -CH (NR ¹ R") -, - CH ₂ -CH ₂ -CH ₂ -NR ¹ -, -CH ₂ -CH ₂ -CH ₂ -O-; -CH ₂ -CH ₂ -CHR'-O- with R ¹ and R "representing a linear or branched C1-C22 alkyl optionally comprising 1 to 12 heteroatoms selected from O, N, S, F, Si and P;

- or a mixture of these radicals.

Preferably R2 can be:

an alkylene radical having 1 to 20 carbon atoms, especially methylene, ethylene, n-propylene, n-butylene, n-hexylene, n-octylene, n-dodecylene, n- octadecylene;

- a phenylene radical -C ₆ H ₄ - (ortho, meta or para) optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms selected from O, N, S, F, Si and P; or

a benzylene radical -C ₆ H ₄ -CH ₂ - optionally substituted by a C ₁ -C ₁₂ alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P.

Preferably, n is between 5 and 200 inclusive, and even better between 7 and 100 inclusive, or even between 9 and 50 inclusive.

Preferably, R3 is a hydrogen atom; a phenyl radical optionally substituted by a C1-C12 alkyl radical optionally comprising 1 to 20 heteroatoms chosen from O, N, S, F, Si and P; a C1-C30 alkyl radical, especially C1-C22 or even C2-C16, optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; a C 3 -C 12, especially C 4 -C 8 or even C 5 -C 6 cycloalkyl radical, optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P. These alkyl, cycloalkyl or phenyl radicals may comprise in particular one or several functions chosen from the following functions:

and / or else chosen from -SO ₃ H, -COOH, -PO ₄ , -NR ₅ R 6 or -N ⁺ R 5 R 6 R 7, with R 5, R 6 and R 7, independently of one another, chosen from H or C 1 - alkyl C18, linear, branched or cyclic, especially methyl, optionally comprising 1 or more heteroatoms or bearing protective groups such as t-butyloxycarbonyl (also called BOC) or 9-fluorenylmethoxycarbonyl (also called FmoC).

Among the R 3 radicals, mention may be made of methyl, ethyl, propyl, benzyl, ethylhexyl, lauryl, stearyl and behenyl chains.

and also fluorinated alkyl chains such as, for example, heptadecafluorooctyl sulfonyl amino ethyl CF ₃ - (CF ₂ ) Z-SO ₂ -N (C ₂ HS) -CH ₂ -CH ₂ ; OR -CH ₂ -CH ₂ -CN, succinimide, maleimido, mesityl, tosyl, triethoxysilane or phthalimide chains.

Preferably, the monomers of formula (I) are such that:

- R1 = H or methyl,

Z represents COO, - x = 1

- m = 0, n = 7 to 100 inclusive,

R3 is chosen from a hydrogen atom; a phenyl radical optionally substituted with a C1-C12 alkyl radical; a C1-C30 alkyl radical, in particular C1-C22 or even C2-C16.

Among the monomers of formula (I) that are particularly preferred, mention may be made of:

poly (ethylene glycol) (meth) acrylate wherein R 1 is H or methyl; Z is COO, x = 1, m = 0 and R3 = H;

methyl (poly) ethylene glycol (meth) acrylate, also known as methoxy-poly (ethylene glycol) methoxy acrylate, in which R 1 is H or methyl, Z is COO, x = 1, m = 0 and R 3 = methyl;

the alkyl (poly) ethylene glycol (meth) acrylate in which R 1 is H or methyl, Z is COO, x = 1, m = 0 and R 3 = alkyl.

phenyl-poly (ethylene glycol) (meth) acrylates, also known as poly (ethylene glycol) phenyl ether (meth) acrylate, in which R 1 is H or methyl, Z is COO, x

= 1, m = 0 and R3 = phenyl.

Examples of commercial monomers are:

CD 350 (methoxy-poly (ethylene glycol 350) methacrylate and CD 550 (methoxypoly (ethylene glycol 550) methacrylate, supplied by Sartomer Chemicals;

M90G (methoxy-poly (ethylene glycol) methacrylate (9 repeating units)) and M230G (methoxy-polyethylene glycol methacrylate (23 repeating units)) available from Shin-Nakamura Chemicals;

the methoxy-poly (ethylene glycol) methacrylates of average molecular weights 300, 475 or 1100, available from Sigma-Aldrich;

the methoxypoly (ethylene glycol) acrylate of average molecular weight 426 available from Sigma-Aldrich;

the methoxy-poly (ethylene glycol) methacrylates available from LAPORTE under the trade names: MPEG 350, MPEG 550, S10W, S20W. poly (ethylene glycol) monomethyl ether, mono (succinimidyl succinate) ester of average molecular weight 1900 or 5000, from Polysciences;

- Behenyl poly (PEG-25 ethylene glycol methacrylate), available from Rhodia under the name SIPOMER BEM;

poly (ethylene glycol) phenyl ether acrylates of average molecular weights 236, 280 or 324 available from Aldrich;

methoxy polyethylene glycol 5000 2- (vinyl sulfonyl) ethyl ether commercially available from Fluka;

polyethylene glycol ethyl ether methacrylate available from Aldrich;

- polyethylene glycol methacrylates 8000, 4000, 2000 from Monomer & PoIymer Dajac laboratories.

The most particularly preferred monomers of formula (I) are chosen from poly (ethylene glycol) (meth) acrylates and (meth) acrylates from poly (ethylene glycol).

Among the hydrophilic monomers that may be used in the context of the present invention, mention may also be made, alone or as a mixture, of the monomers of formula (II), and their salts:

in which :

R1 is a hydrogen atom or a hydrocarbon radical, linear or branched, of CpH ₂ p ₊ 1 type, with p being an integer between 1 and 12, inclusive;

In particular, R 1 may represent a methyl, ethyl, propyl or butyl radical. Preferably, R 1 represents hydrogen or a methyl radical.

Z 'is a divalent group chosen from -COO- and -CONH-,

x 'is 0 or 1, preferably 1.

- R'2 is a divalent carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which may comprise 1 to 18 heteroatoms selected from O, N, S, F, Si and P ;

In R'2, the heteroatom (s), when present, may be intercalated in the chain of said radical R'2, or said radical R'2 may be substituted by one or more groups including them such as hydroxy or amino ( NH 2, NHR 'or NR'R "with R' and R" identical or different representing a linear or branched C1-C22 alkyl, in particular methyl or ethyl). In particular R'2 can be:

an alkylene radical such as methylene, ethylene, propylene, n-butylene, isobutylene, tert-butylene, n-hexylene, n-octylene, n-dodecylene, n-octadecylene, n-tetradecylene, n-docosanylene;

- a phenylene radical -C ₆ H ₄ - (ortho, meta or para) optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from N, O, S, F, Si and / or P; or a benzylene radical -C ₆ H ₄ -CH ₂ - optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P;

- or a mixture of these radicals;

- m 'is O or 1; X is selected from -H, -COOH, -SO ₃ H, -OSO ₃ H, -PO ₃ H ₂ and -OPO ₃ H ₂ .

Among the monomers of formula (II) that are preferred, mention may be made, alone or as a mixture, of acrylamide (-0.780), methacrylamide (-0.228), acrylic acid (0.279), crotonic acid, acid itaconic acid (0.381), fumaric acid (-0.008), maleic acid (-0.008), diacrylic acid, dimethylfumaric acid, citraconic acid (0.50), acrylamidopropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid (-1.786), styrenesulfonic acid, vinylbenzoic acid, vinylphosphoric acid (-0.968), vinylsulfonic acid, vinylbenzene sulphonic acid, acrylamidoglycolic acid of formula CH2 = CH-CONHCH (OH) COOH (-0.780), vinylphosphonic acid (-1.420); sulfopropyl (meth) acrylate (CH ₂ = C (CH ₃ ) CO ₂ (CH ₂ ) ₃ SO ₃ H) (-0.237), sulfoethyl (meth) acrylate (-0.454), vinylmethylsulfone, (methacryloyloxy) ethylphosphate of formula CH ₂ = C (CH ₃ ) COOC ₂ H ₄ OP (O) (OH) ₂ (-0.154); as well as their salts; and their mixtures. Logp values are shown in parentheses.

Among the hydrophilic monomers, mention may also be made of 2-hydroxyethyl acrylate (log p = 0.166), 2-methoxyethyl acrylate (log p = 0.45) and hydroxypropyl acrylate (log p = 0.383 ).

Among the most preferred hydrophilic monomers that can be used, mention may be made of the following monomers:

poly (ethylene glycol) (meth) acrylates,

alkyl (poly) ethylene glycol (meth) acrylates, and more particularly methylpoly (ethylene glycol) methacrylates,

acrylic acid.

The ethylenic polymer according to the invention can obviously comprise a single hydrophilic monomer or a mixture of such hydrophilic monomers. Thus, in a first embodiment of the invention, the polymers present in the dispersion according to the invention may be derived solely from the polymerization of one or more hydrophilic monomers, which will thus represent 100% by weight of the total weight of initial monomers.

However, according to a second embodiment of the invention, the polymers present in the dispersion may be derived from the polymerization of one or more hydrophilic monomers, and one or more additional monomers, which will therefore be of log p greater than 0.5, and which can therefore be present in a proportion of 0.01 to 50% by weight, in particular from 0.5 to 49% by weight, or even from 1% to 48% by weight, and still more preferably from 5% to 45% by weight, based on the total weight of monomers.

In this case, the hydrophilic monomer, or mixtures thereof, may be present in a proportion of from 50% to 99.99% by weight, or even from 51% to 99.5% by weight, in particular from 52% to 99% by weight. and still more preferably from 55% to 95% by weight. The additional monomers may in particular be chosen from the following monomers, alone or as a mixture:

- (i) methacrylic acid,

(ii) esters of (meth) acrylic acid of formula CH ₂ = CHCOOR 4 or CH ₂ = C (CH ₃ ) COOR 4 with R 4 representing a carbon chain, in particular hydrocarbon (alkyl) chain, having 1 to 32 carbon atoms linear, cyclic or branched, saturated or unsaturated, optionally comprising one or more heteroatoms selected from O, N, S; and / or optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F). In particular, the carbon chain R4 can be:

a C1-C32 alkyl group; a C3-C8 cycloalkyl group;

a C6 to C20 aryl group;

a C 7 to C 30 aralkyl group (C 1 to C 4 alkyl group);

a heterocyclic group of 4 to 12 members containing one or more heteroatoms chosen from O, N and S; a heterocycloalkyl (C1-C4 alkyl) group such as a furfuryl group; said alkyl, cycloalkyl, aryl, aralkyl, heterocyclic or heterocycloalkyl groups may comprise intercalated one or more heteroatoms selected from O, N, S and / or be substituted by one or more substituents selected from the hydroxyl group, the atoms of halogen and linear or branched C1-C4 alkyl groups in which one or more heteroatoms selected from O, N, S and P are optionally intercalated, and / or said alkyl groups being furthermore, optionally substituted with one or more substituents selected from hydroxyl group and halogen atoms (Cl, Br, I and F).

Mention may thus be made of methyl, ethyl, propyl, n-butyl, isobutyl, 2-ethylhexyl, octyl, isooctyl, isodecyl, decyl and lauryl (meth) acrylates. tridecyl, dodecyl, myristyl, cetyl, palmityl, stearyl, benzyl, oleyl; tert-butyl, t-butylcyclohexyl, t-butylbenzyl, furfuryl and isobornyl; 2-hydroxyethyl methacrylate, ethoxyethyl (meth) acrylate;

(iii) (meth) acrylamides of formula CH ₂ = CHCONR ₅ R '5 or CH ₂ = C (CH ₃ ) CONR 5 R' 5 in which R 5 and R '5, identical or different, represent a hydrogen atom or a chain carbon, especially hydrocarbon (alkyl), having 7 to 28 carbon atoms, linear, cyclic or branched, saturated or unsaturated, optionally aromatic, optionally comprising one or more heteroatoms selected from O, N, S; and / or optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F).

In particular, the carbon chain R5 and / or R'5 can be:

a C 7 -C 28 alkyl group;

a C 7 to C 8 cycloalkyl group; a C 7 to C 20 aryl group;

a C 7 to C 28 aralkyl group (C 1 to C 4 alkyl group);

a heterocyclic group of 4 to 12 members containing one or more heteroatoms chosen from O, N and S;

a heterocycloalkyl (C1-C4 alkyl) group such as a furfuryl group; said alkyl, cycloalkyl, aryl, aralkyl, heterocyclic or heterocycloalkyl groups may comprise intercalated one or more heteroatoms selected from O, N, S and / or be substituted by one or more substituents selected from the hydroxyl group, the atoms of halogen and linear or branched C1-C4 alkyl groups in which one or more heteroatoms selected from O, N, S and P are optionally intercalated, and / or said alkyl groups may, in furthermore, optionally substituted with one or more substituents selected from hydroxyl group and halogen atoms (Cl, Br, I and F).

Examples of such monomers are N-tertbutyl (meth) acrylamide, N-butyl (meth) acrylamide, N-isobutyl (meth) acrylamide, N-propylmethacrylamide, N-isopropylmethacrylamide, N-hexyl (meth) acrylamide, N-2-ethylhexyl (meth) acrylamide, N-octyl (meth) acrylamide, N-isooctyl (meth) acrylamide, N-nonyl (meth) acrylamide, N-undecyl (meth) acrylamide, N-dodecyl (meth) acrylamide, N-thdecyl (meth) acrylamide, N-tetradecyl (meth) acrylamide, N-hexadecyl (meth) acrylamide, N-palmityl (meth) acrylamide, N-octadecyl (meth) ) acrylamide, N-docosanoyl (meth) acrylamide, N-octadecenoyl (meth) acrylamide, N-cyclohexyl (meth) acrylamide, N-phenyl (meth) acrylamide, N-isobornyl (meth) acrylamide, N benzyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide; N, N-diethylaminopropyl (meth) acrylamide.

(iv) vinyl esters of formula CH ₂ = CH-OCO-R 6 with R 6 representing a carbon chain, in particular hydrocarbon chain, having 1 to 12 carbon atoms, linear or branched, saturated or unsaturated, of which mention may be made of vinyl acetate, vinyl butyrate (or butanoate), vinyl ethylhexanoate, vinyl neononate, vinyl neododecanoate, vinyl propionate, vinyl hexanoate, vinyl ethylhexanoate, vinyl octanoate, vinyl decanoate, vinyl pivalate, vinyl palmitate, vinyl stearate, vinyl cyclohexanoate, vinyl benzoate, vinyl 4-tert-butylbenzoate;

(v) vinyl ethers of formula CH ₂ = CHOR 7 with R 7 representing a carbon chain, in particular a hydrocarbon chain, having 2 to 12 carbon atoms, linear or branched, saturated or unsaturated; among which there may be mentioned ethylvinylether, ethylhexylvinylether, butylvinylether; isobutylvinylether, cyclohexylvinylether, octylvinylether, decylvinylether, dodecylvinylether, hexadecylvinylether and octadecylvinylether.

(vi) the vinyl compounds of formula CH ₂ = CHR 8 in which R 8 is

a hydroxyl group;

a linear or branched alkyl group comprising 1 to 25 carbon atoms, in which one or more heteroatoms selected from O, N, S and P are optionally intercalated; said alkyl group may further be optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F);

a C ₃ to C ₈ cycloalkyl group such as cyclohexane,

a C ₆ to C ₂₀ aryl group such as phenyl, a C ₇ to C ₃ aralkyl group (C ₁ to C ₄ alkyl group) such as 2-phenylethyl or benzyl,

a heterocyclic group of 4 to 12 members containing one or more heteroatoms chosen from O, N, and S,

heterocycloalkyl (alkyl of 1 to 4 carbons), such as furfuryl, furfurylmethyl or tetrahydrofurfurylmethyl, said cycloalkyl, aryl, aralkyl, heterocyclic or heterocycloalkyl groups possibly being substituted by one or more substituents chosen from the hydroxyl group, halogen atoms, and linear or branched C1-C4 alkyl groups in which one or more heteroatoms chosen from O, N, S and P are optionally intercalated, said alkyl groups possibly being , optionally substituted with one or more substituents selected from -OH, halogen atoms (Cl, Br, I and F).

Examples of vinyl monomers are vinylcyclohexane, styrene, vinylcaprolactam, methylstyrene; 4-tert-butylstyrene, 4-acetoxystyrene; 4-methoxystyrene, 3-methylstyrene; 4-methylstyrene, 2-chlorostyrene, 3-chlorostyrene, 4-chlorostyrene, dimethylstyrene; 2,6-dichlorostyrene; 2,4-dimethylstyrene; 2,5-dimethylstyrene; 3,5-ethoxystyrene; 2,4-ethoxystyrene, vinylbutyral; vinyl chloride; the vinylformal; vinylidene chloride, vinylidene fluoride, 2-vinylnaphthalene; N-methyl maleimide; 1-octene, 1-butene; chlorobutadiene, chlorotrifluoroethylene; cis-isoprene, trans-isoprene; 1 - octadecene; butadiene; hexadecene, eicosene, 4-fluorostyrene.

(vii) multifunctional monomers, especially difunctional monomers, such as di (meth) acrylates or th (meth) acrylates, and in particular chosen from 1,4-butanedioldimethacrylate, 1 -6 hexanedioldimethacrylate and 1,12-dodecanedioldimethacrylate; , diallylphthalate, divinylbenzene, poly (ethylene glycol) dimethacrylate, and mixtures thereof. Preferably, the additional monomers may be chosen from the esters and amides of (C 1 -C 18) (meth) acrylic acid, and in particular from (meth) acrylates and methyl, ethyl or propyl (meth) acrylamides, n-butyl, isobutyl, 2-ethylhexyl, tert-butyl, isooctyl, decyl, myristyl, stearyl; styrene, ethylhexylvinylether, dodecylvinylether, and vinyl hexanoate; and their mixtures.

When it comprises acid functions, the polymer according to the invention can be neutralized, totally or partially, with an organic base, for example an amine or a primary, secondary or tertiary alkylamine, the amine possibly comprising substituents or not (hydroxyl) and / or one or more nitrogen and / or oxygen atoms. There may be mentioned amino-2-methyl-2-propanol, triethylamine, butylamine, thethanolamine, dimethylamino-2-propanol, lysine, 3- (dimethylamino) propylamine, cyclohexylamine, N-octylamine N-dodecylamine and N-octadecylamine.

When it comprises basic functions, the polymer according to the invention may be neutralized, totally or partially, with organic acids which may comprise one or more carboxylic, sulfonic or phosphonic groups. It may be linear, branched or cyclic aliphatic acids or aromatic acids. These acids may furthermore comprise one or more heteroatoms chosen from O and N, for example in the form of hydroxyl groups. Acetic acid, alpha-hydroxyethanoic acid, alpha-hydroxyoctanoic acid, alpha-hydroxycaprylic acid, ascorbic acid, benzoic acid, behenic acid, capric acid, caproic acid, caprylic acid, citric acid, dodecylbenzene sulfonic acid, 2-ethylcaproic acid, folic acid, fumaric acid, galactaric acid, gluconic acid, glycolic acid, 2-hexadecyl eicosanoic acid, hydroxycaproic acid, 12-hydroxystearic acid, isolauric acid (or 2-butyl octanoic acid), isomyristic acid (or 2-hexyl octanoic acid), isoarachidic acid (or 2-octyl dodecanoic acid), isolignoceric acid (or 2-decyl tetradecanoic acid), lactic acid, lauric acid, malic acid, myristic acid, oleic acid, palmitic acid, propionic acid, sebacic acid, stearic acid, tartaric acid, terephthalic acid, trimesic acid, undecy acid lene, propyl betaine, cocoamidopropylbetaine, and mixtures thereof. It is possible to neutralize the monomers having a neutralizable acid and / or amine functional group before their polymerization, or else to neutralize the polymer once formed. Preferably, the polymer is neutralized after its formation.

Preferably, the polymer according to the invention has a glass transition temperature (Tg) of less than or equal to + 20 ° C., in particular between -150 ° C. and +20 ^° C., in particular between -70 ° C. and 0 ° C, preferably between -50 ° C and - 20 ° C. For this purpose, the polymers present in the dispersion according to the invention can be derived from the polymerization of one or more monomers of Tg less than or equal to +20 ° C (so-called low Tg), preferably between -150 ° C and 20 ° C, in particular between -70 ° C and 0 ° C, preferably between -50 ° C and -20 ° C, which may be 100% by weight of the total weight of initial monomers, or which may be in admixture with one or more monomers of Tg greater than +20 ° C (called high Tg), but present in an amount such that the overall Tg of the polymer is less than or equal to +20 ° C. In this second case, the monomer of high Tg alone or as a mixture may be present in a proportion of from 0.01 to 50% by weight, relative to the total weight of the monomers, in particular from 0.1 to 40% by weight, even from 1 to 30% by weight, or from 5 to 15% by weight; the monomer of low Tg, alone or as a mixture, then being present in a proportion of 50 to 99.99% by weight, in particular 60 to 99.9% by weight, or even 70 to 99% by weight, or 85% by weight. to 95% by weight, based on the total weight of monomers.

In the present invention, the Tg (or glass transition temperature) indicated are theoretical Tg determined from the theoretical Tg of the constituent monomers of the polymer, which can be found in a reference manual, such as the Polymer Handbook, 4 ^th ed. (Brandrup, Immergut, Grulke), 1999, John Wiley, according to the following relation, Fox's Law: - Tg = Σ r (- Tgi) 'wi being the mass fraction of the monomer i in the polymer and Tgi being the temperature of vitreous transition of the homopolymer of the monomer i (expressed in Kelvin).

In the present description, the term "Tg monomer" refers to the monomer whose homopolymer has such a glass transition temperature.

The person skilled in the art will know, on the basis of Fox's law and his general knowledge, to determine the quantities of each monomer likely to be present in the polymer of the dispersion, so as to always obtain in the end a dispersion. of polymer having a Tg in the desired range.

Preferably, the polymer has only a glass transition temperature. However, it may have several glass transition temperatures, in particular two Tg; in this case, preferably, the lowest Tg is below +20 ° C.

The monomers of low Tg can be chosen from hydrophilic monomers and / or additional monomers; it is the same for monomers of high Tg.

The polymers that may be used in the context of the present invention preferably have a number-average molecular weight (Mn) of between 2000 and 1,000,000, in particular between 3,000 and 800,000, and even more preferably between 4,000 and 500,000, or even between 10,000 and 300,000.

The dispersion of polymer particles according to the invention thus comprises a non-aqueous medium, in which said particles are dispersed.

This non-aqueous medium consists of at least one non-aqueous compound, liquid at 25 ° C., having an overall solubility parameter according to the HANSEN solubility space less than or equal to 20 (MPa) ^1/2 , or a mixture such compounds.

The overall solubility parameter δ according to the Hansen solubility space is defined in the article "Solubility parameter values" by Grulke, in the book "Polymer Handbook" 3 ^èmΘ edition, Chapter VII, pages 519-559 by the relationship :

in which :

- characterizes the LONDON dispersion forces resulting from the formation of induced poles during molecular shocks,

- dp characterizes the DEBYE interaction forces between permanent dipoles,

dH characterizes the specific interaction forces (hydrogen bond, acid / base, donor / acceptor type, etc.).

The definition of solvents in the HANSEN three-dimensional solubility space is described in the HANSEN article: "The three dimensional solubility parameters" J. Paint Technol. 39, 105 (1967).

Among the nonaqueous liquid compounds having an overall solubility parameter according to the HANSEN solubility space less than or equal to 20 (MPa) ^1/2 , mention may be made of liquid fatty substances, in particular oils, which may be chosen from natural or synthetic, carbonated, hydrocarbon-based, fluorinated and / or silicated oils, optionally branched, alone or as a mixture.

Among these oils, mention may be made of vegetable oils formed by esters of fatty acids and of polyols, in particular triglycerides, such as sunflower, sesame or rapeseed oil, or esters derived from acids or long-chain alcohols (ie having from 6 to 20 carbon atoms), in particular the esters of formula RCOOR 'in which R represents the residue of a higher fatty acid containing from 7 to 19 carbon atoms and R represents a hydrocarbon chain comprising from 3 to 20 carbon atoms, such as palmitates, adipates, myristates and benzoates, especially diisopropyl adipate and isopropyl myristate.

Mention may also be made of hydrocarbons and especially paraffin oils, petroleum jelly, or hydrogenated polyisobutylene, C ₈ -C ₁₆ isoparaffins and volatile isoparaffins such as isododecane or 'ISOPARs'. Mention may also be made of silicone oils such as polydimethylsiloxanes and polymethylphenylsiloxanes, optionally substituted with aliphatic and / or aromatic groups, optionally fluorinated, or with functional groups such as hydroxyl, thiol and / or amine groups. ; and volatile silicoated oils, in particular cyclic or linear, such as cyclodimethylsiloxanes, cyclophenylmethylsiloxanes and linear dimethylsiloxanes, among which mention may be made of linear dodecamethylpentasiloxane (L5), octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, hexadecamethylcyclohexasiloxane, heptamethylhexylthsiloxane, heptamethyloctylthsiloxane.

Mention may also be made of solvents, alone or as a mixture, chosen from linear, branched or cyclic esters having from 6 to 30 carbon atoms; ethers having 6 to 30 carbon atoms and ketones having 6 to 30 carbon atoms.

Among the non-aqueous compounds that may be employed, mention may also be made of monoalcohols having an overall solubility parameter according to the HANSEN solubility space of less than or equal to 20 (MPa) ^1/2 , that is to say aliphatic fatty monoalcohols having at least 6 carbon atoms, especially 6 to 32, the hydrocarbon chain having no substitution group. Monoalcohols according to the invention include oleic alcohol, decanol, dodecanol, octadecanol and linoleic alcohol.

Preferably, the nonaqueous medium comprises volatile silicone oils, especially cyclic or linear, such as cyclodimethylsiloxanes and linear dimethylsiloxanes, and / or esters of formula RCOOR 'in which R represents the residue of a higher fatty acid. having 7 to 19 carbon atoms and R 'represents a hydrocarbon chain comprising from 3 to 20 carbon atoms, such as palmitates, adipates, myristates and benzoates, especially diisopropyl adipate and isopropyl myristate ; as well as their mixtures.

The choice of the non-aqueous medium can be carried out easily by those skilled in the art depending on the nature of the monomers constituting the polymer and / or the nature of the stabilizer.

The polymer dispersion can be manufactured as described in EP-A-749747. In general, the polymerization can be carried out in dispersion, that is to say by precipitation of the polymer during formation, with protection of the particles formed using a stabilizer. It is therefore possible to prepare a mixture comprising the initial monomers and a radical initiator. This mixture is dissolved in a synthetic solvent. The monomers are soluble in the reaction medium, whereas the polymer is not soluble therein. As the polymerization proceeds, the polymer will precipitate and be stabilized by the stabilizer present. In this way, polymer particles protected at the surface by the stabilizer are obtained.

The polymerization can be carried out directly in the non-aqueous medium, which can also act as a synthesis solvent.

It is also possible to carry out the polymerization in a synthetic solvent and then carry out a solvent exchange, replacing the synthesis solvent with the non-aqueous medium.

Thus, when the non-aqueous medium chosen is a non-volatile oil, hydrocarbon or silicone, the polymerization can be carried out in an apolar organic solvent (synthetic solvent) and then the non-volatile oil (which must be miscible with said synthetic solvent) can be added. ) and selectively distilling the synthesis solvent. Thus, a synthetic solvent is preferably chosen such that the initial monomers and the radical initiator are soluble therein, and the polymer particles obtained are insoluble therein so that they precipitate during their formation. In particular, the synthesis solvent may be selected from alkanes such as heptane, isododecane or cyclohexane.

When the nonaqueous medium chosen is a volatile hydrocarbon or silicone oil, the polymerization can be carried out directly in the said oil, which thus also acts as a synthesis solvent. The monomers should preferably also be soluble therein, as well as the radical initiator, and the polymer obtained therein is insoluble.

The monomers are preferably present in the synthesis solvent, before polymerization, in a proportion of 5-80% by weight. All of the monomers may be present in the solvent before the start of the reaction, or a portion of the monomers may be added as the polymerization reaction progresses. The radical initiator may be, for example, an azo compound or peroxide such as azobisisobutyronitrile or tert-butylperoxy-2-ethylhexanoate.

The polymer particles are surface stabilized.

In a first embodiment, the particles may be surface-stabilized as the polymerization proceeds, by virtue of a stabilizer which may be in particular a block polymer, a graft polymer, and / or a random polymer, alone or in mixture. The stabilization can be carried out by any known means, and in particular by polymerization in the presence of the stabilizer. Preferably, the stabilizer is present in the mixture from the polymerization. However, it is also possible to add it continuously, especially when continuously adding monomers.

In a second embodiment, the polymer may be synthesized in a synthetic solvent and then dispersed in a non-aqueous dispersion medium. by adding the dispersant, and the evaporated synthetic solvent.

It is possible to use from 0.1 to 30% by weight of stabilizer relative to the weight of the initial monomer mixture, and preferably from 1 to 20% by weight, preferably from 2 to 15% by weight, or even from 3 to 10% by weight. weight.

When a grafted and / or sequenced polymer is used as a stabilizer, the synthesis solvent is chosen such that at least a part of the grafts or sequences of said polymer-stabilizer is soluble in said solvent, the other part of the grafts or sequences not soluble in them. The polymer-stabilizer used during the polymerization must be soluble or dispersible in the synthesis solvent. In addition, a stabilizer having a part (sequences, grafts or other) which has a certain affinity for the polymer formed during the polymerization is preferably chosen. When a random polymer is used as a stabilizer, it is chosen so that it has a sufficient quantity of groups making it soluble in the envisaged synthetic solvent.

Among the graft polymers, mention may be made of silicone polymers grafted with a hydrocarbon chain and hydrocarbon polymers grafted with a silicone chain.

Graft copolymers having, for example, an insoluble polyacrylic backbone with soluble grafts of poly (12-hydroxystearic acid) type are also suitable.

It may also be mentioned, as a stabilizing polymer:

(a) graft or block block copolymers comprising at least one block of polyorganosiloxane type and at least one block of a polymer (i) resulting from the radical polymerization or (ii) resulting from a polycondensation, in particular of type polyether, polyester or polyamide, or a mixture thereof, said copolymer possibly comprising fluorinated entities;

As graft or block block copolymers comprising at least one block of polyorganosiloxane type and at least one block of a radical polymer, there may be mentioned graft copolymers of acrylic / silicone type which may be used in particular when the non-aqueous medium is silicone.

When the graft or block block copolymers comprise at least one block of polyorganosiloxane type and at least one polyether block, the polyorganopolysiloxane block can in particular be a polydimethylsiloxane or a poly (C ₂ -C ₁₈ ) alkylsiloxane; the polyether block may be a C ₂ -C ₁₈ polyalkylene, in particular polyoxyethylene and / or polyoxypropylene. We can thus use the di- methicones copolyol or the (C ₂ -C 18) alkylicicones copolyol, optionally crosslinked. It is possible, for example, to use the dimethicone copolyol sold under the name "Dow Corning 3225C" by the company Dow Corning, or the lauryl methicone copolyol sold under the name "Dow Corning Q2-5200" by the company "Dow Corning".

Mention may also be made of lauryl dimethicone copolyol crosspolymer, for example KSG31 or KSG32 from Shin-Etsu, cetyl dimethicone copolyol such as DMC 3071 from GE, and dimethicone copolyol PPG-3-oleyl ether such as KF-6026 from Shin Et- su.

(b) block or graft block copolymers of (C 1 -C 4) alkyl (meth) acrylates and (C 8 -C 30) alkyl (meth) acrylates. There may be mentioned the stearyl methacrylate / methyl methacrylate copolymer.

(c) graft or block block copolymers comprising at least one block resulting from the polymerization of ethylenic monomer, with one or more optionally conjugated ethylenic bonds, and / or especially with dienes; and at least one polymer block derived from radical polymerization other than diene, especially derived from vinyl monomer, (meth) acrylic or (meth) acrylamide, or from a polyether, a polyester or a polyamide, or their mixtures.

In particular, it is possible to use copolymers comprising at least one block resulting from the polymerization of at least one ethylenic monomer, with one or more optionally conjugated ethylenic bonds, such as ethylene, butadiene, isoprene, and from least one block of a styrenic polymer. When the ethylenic monomer comprises several optionally conjugated ethylenic bonds, the residual ethylenic unsaturations after the polymerization are generally hydrogenated. Thus, in known manner, the polymerization of isoprene leads, after hydrogenation, to the formation of ethylene-propylene block, and the polymerization of butadiene leads, after hydrogenation, to the formation of ethylene-butylene block. Among these block copolymers, mention may be made of "diblock" or "triblock" type copolymers of the polystyrene / polyisoprene, polystyrene / polybutadiene type such as those sold under the name LUVITOL HSB by BASF, of the polystyrene / copoly type. (ethylene-propylene) such as those sold under the name 'KRATON' by Shell Chemical Co. or else from the polystyrene / copoly (ethylene-butylene) type.

As graft or block block copolymers comprising at least one block resulting from the polymerization of at least one ethylenic monomer, such as ethylene, isobutylene, and at least one block of an acrylic polymer such as methacrylate. Methyl crylate include poly (methyl methacrylate) / polyisobutylene bi- or triblock copolymers or poly (methyl methacrylate) backbone graft copolymers with polyisobutylene grafts.

As graft or block block copolymers comprising at least one block resulting from the polymerization of at least one ethylenic monomer and at least one block of a polyether such as a polyoxyalkylene C 2 -C 18, in particular polyoxyethylene and / or polyoxypropylene, mention may be made of the copolymers bi- or tri-block polyoxyethylene / polybutadiene or polyoxyethylene / polyisobutylene.

It is also possible to use as stabilizer compounds such as:

(d) alkyl dimethicones in which the alkyl group comprises 6 to 32 carbon atoms, such as lauryl meticone and stearyl meticone, especially Si tec LDM 3107 from ISP, cetyl dimethicone such as I ¹ Abil Wax 9801, behenoxydimethicone such as Goldschmidt's ABIL 5440

(e) dimethiconol ester of formula:

0> - \, i ^{^ •} ',)

1 I _^ I _ I ^{^} II

in which R is an alkyl radical having 6 to 32 carbon atoms, such as dimethiconol behenate, and in particular the ULTRABEE products of NOVEON and Pecosil DB from Phoenix Chemical.

(f) alkylamidoamines having especially 6 to 60 carbon atoms, especially 12 to 50, such as behenamidopropyldimethylamine and in particular Catemol

220 of Phoenix Chemical, of formula:

(g) copolymers comprising at least one polyorganosiloxane part and fluorinated groups, and in particular fluorinated silicones or fluorosilicones which can be represented by the formula:

wherein x is an integer of 3 to 12, preferably 5 to 10, especially x = 8; y is an integer of 2 to 6, preferably 2 or 3; and m and n are such that the molecular weight of the compound is between 5000 and 15000; and more particularly perfluorononyldimethicone, such as those sold under the name PECOSIL FSH-150 and 300 or PECOSIL FSL-150 and 300 by Phoenix Chemical;

When the synthesis solvent is apolar, it is preferable to choose as a stabilizer, a polymer providing the most complete coverage of the particles possible, several polymer-stabilizer chains then being adsorbed on a particle of polymer obtained by polymerization.

In this case, it is preferred to use as stabilizer, either a graft polymer or a block polymer, so as to have a better interfacial activity. Indeed, the sequences or grafts insoluble in the synthetic solvent provide a larger coverage on the surface of the particles. When the liquid synthetic solvent comprises at least one silicone oil, the stabilizing agent is preferably selected from the group consisting of graft or block copolymer blocks comprising at least one polyorganosiloxane block and at least one block a radical polymer or a polyether or a polyester such as polyoxypropylene and / or oxyethylenated blocks.

In a particularly preferred manner, the dispersion according to the invention is such that:

the hydrophilic monomers are chosen from acrylic acid, poly (ethylene glycol) (meth) acrylates and (poly) alkylpoly (ethylene glycol) (meth) acrylates, and more particularly methylpoly (ethylene) methacrylates; glycol), and mixtures thereof; and or

the stabilizing agent is chosen from fluorinated silicones or fluorosilicones of formula:

wherein x = 8, y = 2 or 3, and m and n are such that the molecular weight of the compound is between 5000 and 15,000; and or

the non-aqueous liquid compound is chosen from volatile silicone oils, in particular cyclic or linear oils, such as linear cyclodimethylsiloxanes and dimethylsiloxanes, and / or esters of formula RCOOR 'in which R represents the residue of a fatty acid; comprising 7 to 19 carbon atoms and R 'represents a hydrocarbon chain comprising from 3 to 20 carbon atoms, such as palmitates, adipates, myristates and benzoates, especially diisopropyl adipate and myristate. isopropyl; as well as their mixtures.

It is possible to add to the polymer dispersion a plasticizer so as to lower the Tg of the polymers used. The plasticizer may be chosen from the plasticizers usually used in the field of application and in particular from the compounds which may be solvents of the polymer. The plasticizer can be integrated during the synthesis or added once the synthesis is carried out.

The dispersions obtained according to the invention can then be used in a composition, in particular a cosmetic or pharmaceutical composition, which moreover comprises a cosmetically or pharmaceutically acceptable medium. Depending on the intended application, dispersions of film-forming or non-film-forming polymers may be used in a non-aqueous medium comprising volatile or non-volatile oils.

The composition may then comprise, according to the intended application, the usual constituents for this type of composition.

Among these constituents, mention may be made of waxes, oils, gums and / or pasty fatty substances, of plant, animal, mineral or synthetic origin, or even silicone, and mixtures thereof.

Among the waxes that may be present in the composition according to the invention, mention may be made, alone or as a mixture, of hydrocarbon-based waxes such as beeswax; the wax of Camauba, Candellila, Ouricoury, Japan, the waxes of cork or sugar cane fibers; paraffin waxes of lignite; microcrystalline waxes; lanolin wax; the wax of Montan; ozokerites; polyethylene waxes; waxes obtained by Fischer-Tropsch synthesis; hydrogenated oils, fatty esters and concrete glycerides at 25 ° C. It is also possible to use silicone waxes, among which mention may be made of alkyls, alkoxys and / or polymethylsiloxane esters.

The composition according to the invention may also comprise oils of mineral, animal, plant or synthetic origin, carbonated, hydrocarbon-based, fluorinated and / or silicone-based, alone or as a mixture insofar as they form a homogeneous and stable mixture and where they are compatible with the intended use. Among the oils that may be present in the composition according to the invention, mention may be made, alone or as a mixture, of hydrocarbon-based oils such as liquid paraffin or petroleum jelly; perhydrosqualene; arara oil; sweet almond oil, calophyllum, palm, castor oil, avocado, jojoba, olive or cereal seed; esters of lanolic acid, oleic acid, lauric acid, stearic acid; alcohols such as oleic alcohol, linoleic or linolenic alcohol, isostearyl alcohol or octyl dodecanol. Mention may also be made of silicone oils such as PDMS, which may be phenylated, such as phenylthymethicones. Volatile oils such as cyclotetradimethylsiloxane, cyclopentadimethylsiloxane, cyclohexadimethylsiloxane, methylhexyldimethylsiloxane, hexamethyldisiloxane or isoparaffins can also be used.

The composition according to the invention may also comprise one or more dyestuffs chosen from pulverulent compounds and / or liposoluble or water-soluble dyes, for example from 0.01 to 70% of the total weight of the composition.

The pulverulent compounds may be chosen from pigments and / or nacres and / or fillers usually used in cosmetic or pharmaceutical compositions. Advantageously, the pulverulent compounds represent 0.1 to 50% of the total weight of the composition and better still 1 to 40%.

The pigments may be white or colored, inorganic and / or organic, interferential or not. Among the inorganic pigments, mention may be made of titanium dioxide, optionally surface-treated, zirconium or cerium oxides, as well as iron or chromium oxides, manganese violet, ultramarine blue, hydrate of chrome and ferric blue. Among the organic pigments, mention may be made of carbon black, D & C type pigments, and lacquers based on cochineal carmine, barium, strontium, calcium, aluminum.

The pearlescent pigments may be chosen from white pearlescent pigments such as mica coated with titanium, or bismuth oxychloride, colored pearlescent pigments such as titanium mica with iron oxides, titanium mica with especially blue ferric or chromium oxide, titanium mica with an organic pigment of the aforementioned type as well as pearlescent pigments based on bismuth oxychloride. The fillers can be mineral or organic, lamellar or spherical. We mention may be made of talc, mica, silica, kaolin, powders of nylon and polyethylene, poly-β-alanine and polyethylene, Teflon, lauroyl-lysine, starch, boron nitride , tetrafluoroethylene polymer powders, hollow microspheres such as Expancel (Nobel Industry), polytrap (Dow Corning) and silicone resin microspheres (Toshiba Tospearls, for example), precipitated calcium carbonate , magnesium carbonate and hydrocarbonate, hydroxyapatite, hollow silica microspheres (SILICA BEADS from MAPRECOS), glass or ceramic microcapsules, metal soaps derived from organic carboxylic acids having from 8 to 22 carbon atoms, preferably from 12 to 18 carbon atoms, for example zinc, magnesium or lithium stearate, zinc laurate, magnesium myristate.

Liposoluble dyes are for example Sudan Red, DC Red 17, DC Green 6, β-carotene, soybean oil, Sudan Brown, DC Yellow, 11, DC Violet 2, Orange DC 5 , yellow quinoline. They may represent from 0 to 20% and in particular from 0.01 to 20% of the weight of the compositions and better still from 0.1 to 6%. The water-soluble dyes are, for example, beet juice, methylene blue and may represent up to 6% of the total weight of the composition.

The composition may also include surfactants, which may be selected from cationic, anionic, amphoteric and nonionic surfactants, and mixtures thereof. These surfactants may be present in a proportion of 0.01 to 30% by weight, especially 0.05 to 20% by weight relative to the total weight of the composition.

The composition may furthermore comprise any additive usually used in the cosmetics field, such as antioxidants, perfumes, essential oils, preservatives, cosmetic active ingredients, moisturizers, vitamins, essential fatty acids, ceramides, filters solar, polymers, thickeners, gelling agents. Of course, those skilled in the art will take care to choose this or these additives and / or their quantity, in such a way that the advantageous properties of the composition according to the invention are not, or not substantially, impaired by the addition envisaged.

The compositions according to the invention may be in any form acceptable and customary for a cosmetic or pharmaceutical composition.

The composition according to the invention may be in the form of a suspension, in particular a dispersion of oil in water by means of vesicles; an oily solution optionally thickened or gelled; an oil-in-water, water-in-oil or multiple emulsion; a gel or a mousse; an oily or emulsified gel; a dispersion of vesicles, in particular lipids; a two-phase or multiphase lotion; a spray; a lotion, a cream, an ointment, a soft paste, an ointment, a solid cast or molded and especially stick or cup, or compacted solid. Those skilled in the art may choose the appropriate dosage form, as well as its method of preparation, on the basis of its general knowledge, taking into account, on the one hand, the nature of the constituents used, in particular their solubility in the support. and on the other hand the application envisaged for the composition.

The cosmetic composition according to the invention may be in the form of a care product and / or make-up of the skin of the body or of the face, the lips and the hair, a sun-product or self-tanning product, or even a hair product. It finds particularly a particularly interesting application in the hair field, especially for maintaining the hairstyle or shaping the hair. The hair compositions are preferably shampoos, gels, styling lotions, blow-drying lotions, fixing and styling compositions such as lacquers, foams or sprays. The lotions may be packaged in various forms, in particular in vaporizers, pump-bottles or in aerosol containers to ensure application of the composition in vaporized form or in the form of foam. The compositions according to the invention can be used for washing or treating keratin materials such as the hair, the skin, the eyelashes, the eyebrows, the nails, the lips, the scalp and more particularly the hair. The compositions according to the invention may be detergent compositions such as shampoos, shower gels and bubble baths. The compositions of the invention may also be in the form of conditioner to be rinsed or not, compositions for permanent, straightening, coloring or bleaching, or in the form of compositions to be rinsed, to be applied before or after coloring, discoloration, permanent or straightening or between the two stages of a perm or straightening. The compositions of the invention may also be in the form of washing compositions for the skin, and in particular in the form of solutions or gels for bathing or showering or makeup removers.

The compositions according to the invention may also be in the form of aqueous or aqueous-alcoholic lotions for the care of the skin and / or the hair.

The composition according to the invention finds another particularly interesting application in the field of make-up, more particularly the makeup of the lips, the eyelashes and / or the face. They can therefore be advantageously in the form of makeup composition, including mascara, eyeliner, lipstick, blush, eyeshadow, foundation.

The subject of the invention is also a process for the cosmetic treatment of keratin materials, in particular the skin of the body or of the face, the lips, the nails, the hair and / or the eyelashes, comprising the application on the said materials of a cosmetic composition as defined above. This method according to the invention allows in particular the maintenance of the hairstyle, the treatment, the care or the washing or the make-up removal of the skin, the hair or any other keratin material.

This process also allows the makeup of the skin, eyelashes, nails, hair and / or lips.

The invention is further illustrated in the following examples, in which the Tg of the polymers is calculated according to Fox's law.

Example 1

In a 500 ml reactor equipped with a condenser, stirring and a 250 ml addition funnel, the constituents of the stock are introduced. It is heated at 80 ° C in 1 hour; then the constituents of the casting are added in 1 hour. The temperature is maintained at 80 ° C for 5 hours.

^* Stabilizer: acrylate / dimethicone copolyol (KP 545 from Shin Etsu) * ^* : BISOMER MPEG 350 of molecular weight 350 (COGNIS) * ^** tert-butylperoxy-2-ethylhexanoate (Trigonox 21 S from Akzo).

A white polymer dispersion is obtained in a volatile silicone oil with a dry matter content of 9.18%.

The hydrophilic monomer represents 79% by weight of the total weight of monomers.

Example 2

^* Stabilizer: ABA-silicone copolyol polymer block dimethicone polyols of Mw =

8000 (GP675 from Genessee Polymer)

^** : BISOMER MPEG 550 of molecular weight 550 (COGNIS)

A white polymer dispersion is obtained in a volatile silicone oil having a dry matter content of 8.7%.

The hydrophilic monomer represents 66.7% by weight of the total weight of monomers.

Example 3 Comparative Example

A comparative dispersion of methyl acrylate copolymer (log p = 0.793) at 90% by weight and acrylic acid (log p = 0.35) at 10% by weight, at 25% by weight in cyclopentadimethylsiloxane (D5) is prepared. The dispersion is stabilized with 2% cetyl PEG / PPG 10/1-dimethicone (ABIL EM 90 from Goldschmidt). The calculated Tg of the polymer is 17 ° C.

The following cosmetic compositions are prepared (in g):

Two grams of each composition A to C are applied to strands of Caucasian natural hair of 20 cm in length weighing 2.7 grams. The locks are kneaded, left to rest for 5 minutes and then rinsed. The wet locks are rolled on hair curlers 2 cm in diameter, then are dried in the helmet for 30 minutes at 70 ° C. After drying, the tone of the loop, the feel of the hair and the disentangling of the combs are evaluated. The control hair has not undergone any treatment

It is noted that the two compositions according to the invention A and B bring a level of tonicity to the almost identical loop; this level is much higher than that obtained with the control wick.

The locks treated with compositions A and B have a touch close to that of the control lock: the lock is soft, smooth and non-greasy.

In addition, disentangling is easy.

The lock treated with the comparative composition C has a rough, greasy and sticky feel, and disentangling is difficult.

The compositions according to the invention thus make it possible to obtain good cosmetic properties of touch (softness) and disentangling, while maintaining a good level of styling.

Example 4: Mascara

A mascara is prepared having the following composition:

- Waxes 25 g - Amino-2-methyl-2-propanediol-1, 3 0.2 g

- Thethanolamine 2.4 g

- Stearic acid 5.4 g

- Dimethicone copolyol (DOW-CORNING Q2-5220) 0.2 g

Sodium Polymethacrylate 0.25 g MA - Dispersion of Example 1 0.5 g

- Pigments 6 g

- Conservatives qs

- Water qs 100 g

Example 5: Body care oil

A moisturizing oil for dry skin is prepared using the following constituents:

caprylic / capric triglycerides 6.5 g - propylene glycol dicaprylate / dicaprate 22 g

cetearyl octanoate and isopropyl myristate 5 g

- isostearyl neopentanoate 2.5 g

- peanut oil 5.25 g dispersion of Example 2 0.5 g

palmitic acid 0.2 g

- antioxidant, preservatives, perfume qs

cyclomethicone qsp l OO g

Example 6: moisturizing cosmetic composition

A moisturizing composition is prepared comprising: Phase A1: - 2.0% sucrose distearate

- oxyethylenated sorbitan stearate (4OE) 1, 4%

- Stearic acid 0.75%

- stearyl heptanoate 5.5%

- Vaseline codex 2.1% - Avocado oil 4.5%

- Jojoba oil 4.1%

- 3.7% volatile silicone oil

dispersion of Example 1 1% Phase A2:

- Silicone Gum (Q2-1403 Fluid) 4.0%

- Perfume, preservative qs

Phase B:

- conservative qs

- Thethanolamine 0.4%

- Water qs 100%

Phase C:

- Carboxyvinyl polymers (CARBOPOL 980) 0.3%

- Water 9.7%

Phases A1 and B are brought to 65 ° C before being associated (B in A1) with stirring (rotor-stator). Phase A2 is dispersed at ambient temperature in the first dispersion, with stirring. Phase C, previously prepared, is then dispersed in order to gel the suspension. A moisturizing emulsion adapted for dry skin is obtained.

Example 7

1 / preparation of the comparative: dispersion of methyl acrylate / acrylic acid 95/5% by weight The synthesis is carried out in semi-batch in an automated reactor of 1 liter; we first introduce in the vat:

- 22.5 g of methyl acrylate (AMe)

4.5 g of acrylic acid (AA) -1.35 g of Trigonox 21 S

- 13.5 g of Kraton G1701

270 g of isododecane

- 103 g of heptane The reaction medium is heated at 90 ° C in one hour, while stirring at 150 rpm. When the temperature of the reaction medium reaches 90 ° C., an exotherm of approximately 10 ° C. is observed and bleaching. Back at 90 ° C, we begin the casting which lasts approximately one hour. This contains:

- 63 g of methyl acrylate (AMe) - 0.99 g of Trigonox 21 S

Once the casting is complete, it is allowed to polymerize for 3 hours at 90 ° C. The heptane is then distilled under reduced pressure and replaced with isododecane.

2 / Preparation of Dispersion According to the Invention The above procedure is used to prepare the dispersions according to the invention; MPEG and acrylic acid are added during casting.

3 / evaluation in a humid environment.

After making polymer films of about 1 mm wet thickness (from 20 weight percent polymer dispersion) onto the Teflon and cut into a square (3 × 3 cm), they are immersed in the water at 25 ° C. ° C (0.2 g of polymer film in 20 g of water) and qualitatively monitor the evolution of color, stickiness, slipperiness and water uptake of these films. The following results are obtained (% by weight):

- initially, on dry film (before immersion) - after 14 days of immersion

- after 14 days of immersion + drying for 24 hours (on dry film)

Comparative Film: Invention A: Invention B: 95% AMe + 5% 50% MPEG550 50% MPEG550 AA + 50% AMe + 5% AA + 45% AMe

Initial Color Translucent bluish

(Sticky film 0 ++ ++ dry) Slippery 0

Color Trouble White White

Pantyhose (at

0

Immerdigt) ge in Glissant (at

0 ++ +++ water (14 finger) days) Caking (eg,

"0 = no", "+ = a little", "++ = enough", "+++ = a lot"

It can be seen that the film of the comparative polymer is initially tack-free. In a humid environment, it is not slippery or sticky and neither bleaching nor caking is observed.

The films obtained with the dispersions according to the invention are very slippery in a humid environment, so they will be more comfortable to wear. In addition, some films can absorb / capture water (they take the mass) and then we observe a swelling of the film, resulting in a larger volume.

Claims

1. Dispersion of particles of at least one ethylene polymer stabilized at the surface by a stabilizing agent, in a non-aqueous medium consisting of at least one non-aqueous compound, liquid at 25 ° C., having an overall solubility parameter according to US Pat. HANSEN solubility space less than or equal to 20 (MPa) ^1/2 , or a mixture of such compounds; characterized in that said ethylenic polymer comprises from 50 to 100% by weight of hydrophilic monomer having a logarithm value of the octanol-1 / water apparent partition coefficient (log p) less than or equal to 0.5, or a mixture of such monomers, based on the total weight of monomers.

2. A dispersion according to claim 1 wherein the polymer comprises from 51 to 99.9% by weight, more preferably from 53 to 99% by weight, or even from 55 to 98% by weight, especially from 60 to 95% by weight. weight, preferably from 65 to 85% by weight of hydrophilic monomer, alone or as a mixture, relative to the total weight of initial monomers.

3. Dispersion according to one of the preceding claims, wherein the hydrophilic monomer has a log p value of between -10 and 0.5, preferably between -8 and 0, and in particular between -6 and -0. 5.

4. Dispersion according to one of the preceding claims, wherein the hydrophilic monomer is chosen from, alone or as a mixture, the monomers of formula (I):

H ₂ C = C ^(I) V) _x - (R ₂ J- (CH ₂ CH ₂ O) _n -RS in which:

- x is 0 or 1;

R2 is a divalent carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which can comprise 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; m is 0 or 1;

n is an integer between 3 and 300 inclusive;

The dispersion of claim 4, wherein Z is COO or CONH.

6. Dispersion according to one of claims 4 to 5, wherein the radical R2 is: - an alkylene radical having 1 to 20 carbon atoms, such as methylene, ethylene, n-propylene, n-butylene, n-hexylene, n-octylene, n-dodecylene, n-octadecylene;

- a phenylene radical -C ₆ H ₄ - (ortho, meta or para) optionally substituted by a C 1 -C 12 alkyl radical optionally comprising 1 to 18 heteroatoms selected from O, N, S, F, Si and P; or a benzylene radical -C ₆ H ₄ -CH ₂ - optionally substituted with a C ₁ -C ₁₂ alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P.

7. Dispersion according to one of claims 4 to 6, wherein the radical R3 is a hydrogen atom; a phenyl radical optionally substituted by a C1-C12 alkyl radical optionally comprising 1 to 20 heteroatoms chosen from O, N, S, F, Si and P; a C1-C30 alkyl radical, optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; or a C3-C12 cycloalkyl radical, optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P.

8. Dispersion according to one of claims 4 to 7, wherein the hydrophilic monomer is selected from, alone or in mixture:

poly (ethylene glycol) (meth) acrylate wherein R 1 is H or methyl; Z is COO, x = 1, m = 0 and R3 = H; methyl (poly) ethylene glycol (meth) acrylate, also known as methoxy-poly (ethylene glycol) methoxy acrylate, in which R 1 is H or methyl, Z is COO, x = 1, m = 0 and R 3 = methyl;

the alkyl (poly) ethylene glycol (meth) acrylate in which R 1 is H or methyl, Z is COO, x = 1, m = 0 and R 3 = alkyl. phenyl-poly (ethylene glycol) (meth) acrylates, also known as poly (ethylene glycol) phenyl ether (meth) acrylate, in which R 1 is H or methyl, Z is COO, x = 1, m = 0 and R3 = phenyl.

9. Dispersion according to one of claims 1 to 3, wherein the hydrophilic monomer is chosen from, alone or as a mixture, the monomers of formula (II):

/ ¹ H ₂ C = C (H)

V ⁾ - ^(R ₂ ¹⁾ - * in which:

R1 is a hydrogen atom or a hydrocarbon radical, linear or branched, of CpH ₂ p ₊ 1 type, with p being an integer between 1 and 12, inclusive; Z 'is a divalent group chosen from -COO- and -CONH-, x 'is 0 or 1, preferably 1;

- R'2 is a divalent carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which may comprise 1 to 18 heteroatoms selected from O, N, S, F, Si and P ; - m 'is O or 1;

X is selected from -H, -COOH, -SO ₃ H, -OSO ₃ H, -PO ₃ H ₂ and -OPO ₃ H ₂ .

10. Dispersion according to claim 9, wherein R'2 is:

- or a mixture of these radicals;

1. The dispersion according to one of claims 9 to 10, wherein the monomer of formula (II) is chosen from, alone or as a mixture, acrylamide (-0.780), methacrylamide (-0.228), acrylic acid (0.279), crotonic acid, itaconic acid (0.381), fumaric acid (-0.008), maleic acid (-0.008), diacrylic acid, dimethyl fumaric acid, citraconic acid (0.50), acrylamidopropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid (-1.786), styrenesulfonic acid, vinylbenzoic acid, vinylphosphoric acid (-0.968 ), vinylsulfonic acid, vinylbenzene sulfonic acid, acrylamidoglycolic acid of the formula CH2 = CH-CONHCH (OH) COOH (-0.780), vinylphosphonic acid (-1.420); sulfopropyl (meth) acrylate (CH ₂ = C (CH ₃ ) CO ₂ (CH ₂ ) ₃ SO ₃ H) (-0.237), sulfoethyl (meth) acrylate (-0.454), vinylmethylsulfone, (methacryloyloxy) ethylphosphate of formula CH ₂ = C (CH ₃ ) COOC ₂ H ₄ OP (O) (OH) ₂ (- 0.154); as well as their salts; and their mixtures.

12. Dispersion according to one of claims 1 to 3, wherein the hydrophilic monomer is selected from 2-hydroxyethyl acrylate (log p = 0.166), 2-methoxyethyl acrylate (log p = 0.45) and hydroxypropyl acrylate (log p = 0.383).

13. Dispersion according to one of the preceding claims, wherein the hydrophilic monomer is chosen from, alone or as a mixture,

poly (ethylene glycol) (meth) acrylates; alkylpoly (ethylene glycol) (meth) acrylates, and more particularly methylpoly (ethylene glycol) methacrylates, and

acrylic acid.

14. Dispersion according to one of the preceding claims, wherein the polymer further comprises 0.01 to 50% by weight, especially 0.5 to 49% by weight, or even 1 to 48% by weight, relative to the total weight. monomers, additional monomer, alone or in mixture.

15. Dispersion according to claim 14, wherein the additional monomer is chosen from, alone or as a mixture:

- (i) methacrylic acid;

(ii) esters of (meth) acrylic acid of formula CH ₂ = CHCOOR 4 or CH ₂ = C (CH ₃ ) COOR 4 with R 4 representing a carbon chain, in particular hydrocarbon (alkyl) chain, having 1 to 32 carbon atoms linear, cyclic or branched, saturated or unsaturated, optionally comprising one or more heteroatoms selected from O, N, S; and / or optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F). (iii) (meth) acrylamides of formula CH ₂ = CHCONR ₅ R '5 or CH ₂ = C (CH ₃ ) CONR 5 R' 5 in which R 5 and R '5, identical or different, represent a hydrogen atom or a chain carbon, especially hydrocarbon (alkyl), having 7 to 28 carbon atoms, linear, cyclic or branched, saturated or unsaturated, optionally aromatic, optionally comprising one or more heteroatoms selected from O, N, S; and / or optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F).

(iv) vinyl esters of formula CH ₂ = CH-OCO-R 6 with R 6 representing a carbon chain, in particular hydrocarbon chain, having 1 to 12 carbon atoms, linear or branched, saturated or unsaturated;

(v) vinyl ethers of formula CH ₂ = CHOR 7 with R 7 representing a carbon chain, in particular hydrocarbon chain, having 2 to 12 carbon atoms, linear or branched, saturated or unsaturated; (vi) vinyl compounds of formula CH ₂ = CHR 8 in which R 8 is - a hydroxyl group;

a linear or branched alkyl group comprising 1 to 25 carbon atoms in which one or more heteroatoms chosen from O, N, S and P are optionally intercalated; said alkyl group may further be optionally substituted by one or more substituents selected from -OH and halogen atoms (Cl, Br, I and F);

a C ₃ to C ₈ cycloalkyl group such as cyclohexane,

a C ₆ to C ₂₀ aryl group such as phenyl,

a C ₇ to C ₃₀ aralkyl group (C 1 to C ₄ alkyl group) such as 2-phenylethyl or benzyl; a 4 to 12-membered heterocyclic group containing one or more heteroatoms selected from O, N, and S,

heterocycloalkyl (alkyl of 1 to 4 carbons), such as furfuryl, furfurylmethyl or tetrahydrofurfurylmethyl, said cycloalkyl, aryl, aralkyl, heterocyclic or heterocycloalkyl groups being capable of being optionally substituted by one or more substituents chosen from the hydroxyl group, the halogen atoms, and the linear or branched C1-C4 alkyl groups in which ) optionally intercalated (s) one or more heteroatoms selected from O, N, S and P, said alkyl groups may further be optionally substituted with one or more substituents selected from -OH, the halogen atoms (Cl, Br , I and F).

(vii) multifunctional monomers, especially difunctional monomers, such as di (meth) acrylates or th (meth) acrylates.

16. Dispersion according to one of claims 14 to 15, wherein the additional monomer is chosen from, alone or as a mixture, esters and amides of (meth) acrylic acid C1-C18, and in particular among (meth) ) methyl, ethyl, propyl, n-butyl, isobutyl, 2-ethylhexyl, tert-butyl, isooctyl, decyl, myristyl and stearyl acrylates and (meth) acrylamides; styrene, ethylhexylvinylether, dodecylvinylether, and vinyl hexanoate.

17. Dispersion according to one of the preceding claims, wherein the ethylene polymer has a glass transition temperature (Tg) less than or equal to + 20 ° C, in particular between -150 ° C and + 20 ° C, especially between - 70 ° C and 0 ° C, preferably between -50 ° C and -20 ° C.

18. Dispersion according to one of the preceding claims, wherein the ethylenic polymer has a number average molecular weight (Mn) of between 2000 to 1000 000, in particular between 3000 and 800 000, and more preferably between 4000 and 500 000.

19. Dispersion according to one of the preceding claims, wherein said non-aqueous liquid compound having an overall solubility parameter according to the HANSEN solubility space less than or equal to 20 (MPa) ^1/2 , is chosen from, alone or in a mixture, the liquid fatty substances, especially natural or synthetic, carbonaceous, hydrocarbon, fluorinated and / or silicone oils, optionally branched.

20. Dispersion according to one of the preceding claims, wherein said non-aqueous liquid compound is chosen from:

vegetable oils formed by esters of fatty acids and polyols, in particular triglycerides, such as sunflower, sesame or rapeseed oil, or esters derived from long-chain acids or alcohols ( that is to say having from 6 to 20 carbon atoms), in particular the esters of formula RCOOR 'in which R represents the residue of a higher fatty acid comprising from 7 to 19 carbon atoms and R' represents a chain hydrocarbon containing from 3 to 20 carbon atoms, such as palmitates, adipates, myristates and benzoates, especially diisopropyl adipate and isopropyl myristate. hydrocarbons and especially paraffin oils, petroleum jelly, or hydrogenated polyisobutylene, C ₈ -C ₁₆ isoparaffins and volatile isoparaffins such as isododecane or ISOPARs.

silicone oils such as polydimethylsiloxanes and polymethylphenylsiloxanes, optionally substituted with optionally fluorinated aliphatic and / or aromatic groups, or with functional groups such as hydroxyl, thiol and / or amine groups; and volatile silicone oils, in particular cyclic or linear oils, such as cyclodimethylsiloxanes, cyclophenylmethylsiloxanes and linear dimethylsiloxanes, among which may be linear dodecamethylpentasiloxane (L5), octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, hexadecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane.

solvents, alone or as a mixture, chosen from linear, branched or cyclic esters having from 6 to 30 carbon atoms; ethers having 6 to 30 carbon atoms and ketones having 6 to 30 carbon atoms.

aliphatic fatty alcohols having at least 6, in particular 6 to 32, carbon atoms, the hydrocarbon chain not containing a substitution group, such as oleic alcohol, decanol, dodecanol, octadecanol and alcohol; Iineoleic.

21. Dispersion according to one of the preceding claims, wherein said non-aqueous liquid compound is chosen from volatile silicone oils, especially cyclic or linear, such as cyclodimethylsiloxanes and linear dimethylsiloxanes, and / or esters of formula RCOOR 'in which R represents the residue of a higher fatty acid having from 7 to 19 carbon atoms and R 'represents a hydrocarbon chain comprising from 3 to 20 carbon atoms, such as palmitates, adipates, myristates and benzoates, in particular diisopropyl adipate and isopropyl myristate; as well as their mixtures.

22. Dispersion according to one of the preceding claims, wherein the stabilizing agent is selected from block polymers, graft polymers and / or random polymers, alone or in mixture.

23. Dispersion according to one of the preceding claims, wherein the stabilizing agent is present in a proportion of 0.1 to 30% by weight relative to the weight of the initial mixture of monomers, preferably 1 to 20% by weight, preferably from 2 to 15% by weight, or even from 3 to 10% by weight.

24. Dispersion according to one of the preceding claims, wherein the stabilizing agent is chosen from:

silicone polymers grafted with a hydrocarbon chain and hydrocarbon polymers grafted with a silicone chain.

graft copolymers having an insoluble backbone of polyacrylic type with soluble grafts of poly (12-hydroxy stearic acid) type.

grafted or block block copolymers comprising at least one block of polyorganosiloxane type and at least one block of a polymer (i) resulting from the radical polymerization or (ii) resulting from a polycondensation, in particular of the polyether, polyester or polyamide type or their mixture, said copolymer may comprise fluorinated entities;

grafted or block block copolymers of (C 1 -C 4) alkyl (meth) acrylates and (C 8 -C 30) alkyl (meth) acrylates;

grafted or block copolymers comprising at least one block resulting from the polymerization of ethylenic monomer, with one or more optionally conjugated ethylenic bonds, and / or especially with dienes; and at least one polymer block derived from radical polymerization other than diene, especially derived from vinyl monomer, (meth) acrylic or (meth) acrylamide, or from a polyether, a polyester or a polyamide, or their mixtures thereof;

alkyl dimethicones in which the alkyl group comprises 6 to 32 carbon atoms, such as lauryl methicone, stearyl methicone, cetyl dimethicone, behenoxydimethicone;

the dimethiconol esters of formula:

0 CM. OL CM .. O

1 III ^* II ï? -C- GV; -O- ^ S; -Oï _s _: -O- C- £

in which R is an alkyl radical having 6 to 32 carbon atoms, such as dimethiconol behenate,

alkylamidoamines having in particular 6 to 60 carbon atoms, especially 12 to 50, such as behenamidopropyldimethylamine.

copolymers comprising at least one polyorganosiloxane part and fluorinated groups, and in particular fluorinated silicones or fluorosilicones which can be represented by the formula:

wherein x is an integer of 3 to 12, preferably 5 to 10, especially x = 8; y is an integer of 2 to 6, preferably 2 or 3; and m and n are such that the molecular weight of the compound is between 5000 and 15000.

25. Cosmetic or pharmaceutical composition comprising, in a cosmetically or pharmaceutically acceptable medium, at least one dispersion as defined according to one of the preceding claims.

26. Composition according to claim 25, furthermore comprising at least one constituent chosen from waxes, oils, gums and / or pasty fatty substances of plant, animal, mineral, synthetic or even silicone origin, and their mixtures thereof; one or more dyestuffs chosen from pulverulent compounds and / or liposoluble or water-soluble dyes; antioxidants, perfumes, essential oils, preservatives, cosmetic active ingredients, moisturizers, vitamins, essential fatty acids, ceramides, sunscreens, surfactants, polymers, thickeners, gelling agents.

27. Composition according to one of claims 25 to 26, being in the form of a care product and / or makeup of the skin of the body or face, lips and hair, a sun product or spray tan; a hair product, in particular for treating, washing, holding or shaping the hair.

28. Composition according to one of claims 25 to 27, being in the form of a shampoo, gel, setting lotion, blow-drying lotion, fixing and styling composition such as lacquers, foams or sprays; a conditioner to be rinsed or not, a composition for permanent, straightening, coloring or bleaching, or compositions for rinsing, to be applied before or after coloring, discoloration, permanent or straightening or else between the two stages of a perm or straightening; washing compositions for the skin, and in particular in the form of bath or shower solutions or gels or makeup removers; aqueous or hydroalcoholic lotions for the care of the skin and / or the hair.

29. Composition according to one of claims 25 to 27, in the form of a makeup composition, including mascara, eyeliner, lipstick, blush, eyeshadow, foundation.

30. A process for the cosmetic treatment of keratin materials, in particular the skin of the body or face, lips, nails, hair and / or eyelashes, comprising the application to said materials of a cosmetic composition as defined in one of claims 25 to 29.