FR2934271A1 - Dispersion of particles of polymer sequence comprises ethylene glycol monomer in a liquid carbon medium, useful in a cosmetic composition for makeup/care of keratin materials, preferably skin of body/face, lips, fingernails and/or hair - Google Patents

Abstract

Dispersion of particles of polymer sequence comprises ethylene glycol monomer (I) (0.5-50 wt.%), in a liquid carbon medium. Dispersion of particles of polymer sequence comprises ethylene glycol monomer of formula (H 2C=C(R 1)((Z) x-(R 2) m-(CH 2CH 2O) n-R 3)) (I) (0.5-50 wt.%), in a liquid carbon medium. R 1H or CH 3; Z : divalent group comprising -COO-, -CONH-, -CONCH 3-, -OCO-, -O-, -SO 2-, -CO-O-CO- or -CO-CH 2-CO-; x : 0 or 1; R 2optionally saturated, aromatic, linear, branched or cyclic 1-30C divalent carbon radical comprising 1-18 heteroatoms of O, N, S, F, Si or P; m : 0 or 1; n : 3-300; and R 3H or optionally saturated, aromatic, linear, branched or cyclic carbon radical of 1-30C comprising 1-20 heteroatoms of O, N, S, F, Si or P. An independent claim is included for a cosmetic composition comprising the dispersion, in a medium.

Description

The present invention relates to novel dispersions of polymer particles, and to their use in cosmetics; the invention also relates to especially cosmetic compositions comprising these dispersions.

It is known to use in cosmetics dispersions of polymer particles, generally of nanometric size, in organic media. Notably, in EP749747, there is disclosed a cosmetic composition comprising a dispersion of polymer particles in an organic medium, said dispersion being stabilized by addition of stabilizing polymers, which bind non-covalently through physical interactions on the polymer particles. However, this type of composition has the disadvantage of requiring the addition in the organic medium of a greater amount of stabilizing polymers than actually bound to insoluble polymer particles, in order to obtain a relatively stable dispersion. However, during the addition of adjuvants such as pigments, some of the stabilizing polymers tend to desorb insoluble polymer particles to associate with said adjuvants, which contributes to destabilizing the dispersion, especially by formation agglomerates between the polymer particles. Also known by the application EP1428844, are cosmetic compositions comprising dispersions, in an organic medium, of acrylic polymer particles comprising an insoluble backbone in said medium, and a portion soluble in said medium consisting of side chains which are bound in such a manner. covalently to said skeleton. In this case, the polymer particles are stabilized by a macromer which is chemically bonded to the polymer particles.

In both cases, the nature of the stabilizing polymer is not very flexible, whether in terms of chemical nature, molecular weight and / or architecture, and must be the subject of a specific synthesis. Furthermore, it is not easy to modulate the properties of the core of the particle, whether in terms of molecular weight and / or architecture.

In addition, these dispersions do not make it possible to obtain optimum cosmetic properties, especially in terms of slipperiness, non-stickiness, comfort, hold of the composition and feel.

The Applicant has surprisingly discovered new dispersions of polymer particles, in an organic medium, making it possible to obtain good cosmetic properties such as good adhesion to the support (skin or hair), and therefore good performance of the cosmetic composition. . Furthermore, the dispersion according to the invention does not comprise stabilizer in the sense of the prior art, it is much more stable in time than the usual dispersions, which implies a better stability of the composition comprising it and a ease of formulation. Finally, the comfort of the cosmetic composition is improved, as well as its touch, softness and slipperiness, and its non-sticky nature, which was one of the desired properties.

An object of the present invention is a dispersion, in a linear carbon medium, of particles of sequenced polymer, said block polymer comprising 0.5 to 50% by weight relative to the total weight of monomers, of monomer of formula (I ) as defined below.

The invention also relates to the cosmetic composition comprising, in a cosmetically acceptable medium, said dispersion.

Thanks to the invention, it is possible to modulate the physico-chemical properties of the dispersion, and therefore of the composition comprising it, by appropriately selecting the monomers and the organic medium component. This makes it possible in particular to obtain a dispersion which has a high affinity for oily mid-places, usually used in cosmetics; this also makes it possible to prepare a dispersion whose deposit does not have any tack.

The presence of PEG units in the dispersion polymer makes it possible to provide at the same time slipperiness, insensitivity to oils, that is to say an improvement in comfort and strength, as well as in the volume and gloss. PEG patterned polymers have enhanced comfort properties due to the sliding and lubrication of PEG patterns that develop in a moist environment. The compositions according to the invention can provide, in the field of make-up, increased comfort properties, in particular improved slipperiness, in particular in a humid environment. In addition, they may have improved resistance to external aggression (meals, sebum) and friction. Comfort and holding are improved. In the more particular case of lipsticks, the use of saliva on the lips may allow to relubricate to prolong the comfort and the holding, and also to generate a swelling, or volume, which will give an effect repulpeur; the wet film thus created on the surface protects the deposit; the dispersions according to the invention can therefore bring volume by swelling in the presence of water, as well as a 'wet' gloss.

In addition, the fact of preparing the polymers in the form of dispersion in the oil makes it possible to incorporate larger quantities of polymer, ie PEG units, with equal viscosity, in the cosmetic formulation, in comparison with the use of these polymers in the form of oily solutions.

In addition, the invention makes it possible to obtain polymer particles that can be very small, in particular nanometric; this is not the case with, for example, other types of particles such as microspheres whose diameter is generally greater than 1 micron. However, a significant size of the order of a micron has the disadvantage of causing some visibility of the particles to the eye when they are in a composition and / or when applied to the skin, as well as a bad stability of the composition, especially over time. Thus, the dispersions according to the invention make it possible to obtain stable compositions, which can be transparent, translucent or opaque, as desired, in particular according to the size of the polymer particles dispersed therein.

Finally, the dispersions according to the invention are in oily media particularly popular in the field of makeup; However, the polymers comprising PEG units (polyethylene glycol) have hitherto generally been used in aqueous solution or dispersion, a medium which is more difficult to formulate in the field of make-up.

The dispersion according to the invention therefore comprises particles of sequenced polymer. Preferably, said polymer comprises at least a first soluble sequence in the carbonaceous dispersion medium, and at least a second insoluble sequence in said medium.

Sequence refers to the present invention, a polymeric linkage formed of several monomers, including at least 5 monomers, identical or different, and which can be in the form of a homopolymer or a copolymer statistical, alternating, gradient or block, in particular di-block, triblock or multiblock. Preferably, the sequence will be homopolymer or gradient type. For each sequence, the choice of the monomers and their quantity, as well as the architecture of the sequence, can be carried out by those skilled in the art on the basis of their general knowledge so as ultimately to obtain a sequence having the solubility required (soluble or insoluble) in the carbon medium under consideration.

In the end, the block polymer is preferably of the 'diblock' type, that is to say that it comprises only two sequences, one being soluble in the medium, the other being insoluble therein; or of the 'triblock' type, that is to say comprising 3 sequences, preferably triblock of soluble / insoluble / soluble type. It can however be of the 'multiblock' type (more than three blocks). Preferably, the sequence of soluble and insoluble blocks is alternated. Each block or soluble sequence may be of different or identical length and / or molecular weight, of different or identical chemical nature, of different or identical architecture. Each block or insoluble sequence may be of different or identical length or molar mass, of different or identical chemical nature, of different or identical architecture.

Preferably, the block polymer according to the invention is linear; however, it can be branched and / or grafted. Said polymer is not crosslinked; by this is meant that there is no voluntary addition of compound for crosslinking (crosslinking agent).

By soluble sequence is meant that the sequence is completely dissolved (no apparent deposit, no agglomerate or insoluble sediment), visually, at 20 ° C, at a concentration greater than or equal to 5% by weight, in the carbon medium considered.

The dispersions according to the invention may especially be in the form of polymeric micelles (or particles) in stable dispersion in the medium in question. These micelles (or particles) are preferably of a size of between 5 and 1000 nm, preferably 10 to 500 nm, more preferably 20 to 300 nm, or even 30 to 200 nm, which makes it possible to obtain high stability in the time of dispersion.

By polymeric micelles is meant self-dispersed particles obtained by self-assembly of the block polymers according to the invention. Thus, it can be considered that the polymerization of the monomers constituting the first block, in the presence of initiator and / or control agent, will lead to a first sequence, preferably soluble in the medium considered. The polymerization of the monomers intended to form the second, preferably insoluble, sequence, which will form the central sequence in the case of the triblocks, and in all cases the core of the particle, results in the formation of a sequenced polymer which will spontaneously organize in polymeric micelle that is to say, to form a self-dispersed polymer particle in the medium.

It is thus possible to form in a single step dispersed polymer particles, whose characteristics of the soluble part and those of the core of the particle are simultaneously controllable.

The block polymers according to the present invention preferably have a number average molecular weight (Mn) of between 1000 to 700 000, in particular between 10000 and 500 000, and more preferably between 15 000 and 350 000, or even between 25 000 and 150 000.

Preferably, the polymers according to the invention have a polydispersity index in mass (Ip) less than or equal to 6, preferably between 1.05 and 4, in particular between 1.1 and 3, or even between 1.15. and 2.5. The mass polydispersity index (Ip) is equal to the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn). Low mass polydispersity translates approximately identical chain lengths. The weight average molecular weights (Mw) and number (Mn) are determined by gel permeation liquid chromatography (GPC), eluent THF, calibration curve established with linear polystyrene standards, refractometric detector.

Preferably, the dispersion according to the invention has a homogeneous particle size polydispersity, which means that all the particles are of the same size; in particular, the dispersion is preferably such that at least 50% by number of the particles of the dispersion have an identical or almost identical diameter (difference of less than 10%); this contributes to a better stability of the dispersion over time (no settling, flocculation and / or sedimentation). This is an advantage over certain prior art dispersions prepared by so-called conventional free-radical polymerization processes; in fact, in these processes, the product obtained is heterogeneous in chemical composition because it is generally a mixture of homopolymers and copolymers. In the present invention, the vast majority or all of the chains (depending on the chosen polymerization technique) may be in the form of a copolymer, which will have the particularity of improving the stability of the dispersions. Moreover, the polymers according to the invention generally have molar mass distributions and narrow chemical compositions and controlled molar masses which makes it possible to control the size of the particles and their size distribution.

The block polymer according to the invention is particularly remarkable because it comprises 0.5 to 50% by weight, relative to the total weight of the monomers constituting it, of one or more monomers of formula (I) and / or their salts: (Z) X (R 2) 7 (CH 2 CH 2 O) n R 3 (I) / R 1 H 2 C = C in which: R 1 is a hydrogen atom or a methyl radical; Z is a divalent group selected from -COO-, -CONH-, -CONCH3-, -OCO-, -O-, -SO2- -CO-O-CO- or -CO-CH2-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; - mest0ou1; 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.

Preferably, x = 1 and Z represents COO or CONH, preferentially COO.

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-CONR-, where R is H or a linear or branched C1-C22 alkyl, optionally comprising 1 to 12 heteroatoms selected from O, N, S, F, Cl, Br, Si and P.

In particular R2 may 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, iso-octylene, nonylene, isononylene, decylene, isodecylene, n-dodecylene, isododecylene, tridecylene, n-tetradecylene, hexadecylene, n-octadecylene, docosanylene, arachinylene; - a cycloalkylene radical having 5 to 10 carbon atoms, substituted or unsubstituted, such as cyclopentylene, cyclohexylene, cycloheptylene, cyclooctylne, cyclononylene, cyclodécylène; a phenylene radical -C6H4- (ortho, meta or para) optionally substituted with a C1-C12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; a benzene radical -C6H4-CH2- optionally substituted with a C1-C12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; a radical of formula -CH2-O-CO-O-, CH2-CH2-O-CO-O-, -CH2-CO-O-, -CH2-CH2-CO-O-, -CH2-O-CO -NH-, -CH2-CH2-O-CO-NH-; -CH2-NH-CO-NH-, -CH2-CH2-NH-CO-NH-; -CH2-CHOH-, -CH2-CH2-CHOH-, -CH2-CH2-CH (NH2) -, -CH2- CH (NH2) -, -CH2-CH2-CH (NHR ') -, -CH2-CH (NHR') -, -CH2-CH2-CH (NR'R ") -, -CH2-CH (NR'R) ") -, -CH2-CH2-CH2-NR'-, -CH2-CH2-CH2-O-; -CH2-CH2-CHR'-O- with R '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 may be: an alkylene radical having 1 to 20 carbon atoms, especially methylene, ethylene, n-propylene, n-butylene, n-hexylene, n-octylene, n-dodecylene, noctadecylene; a phenylene radical -C6H4- (ortho, meta or para) optionally substituted with a C1-C12 alkyl radical optionally comprising 1 to 18 heteroatoms chosen from O, N, S, F, Si and P; or a benzylene radical -C6H4-CH2- optionally substituted with a C1-C12 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 more preferably between 6 and 120 inclusive, or even between 7 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, in particular 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.

Among the R 3 radicals, mention may be made of the methyl, ethyl, propyl, benzyl, ethylhexyl, lauryl, stearyl and behenyl (- (CH 2) 21 -CH 3 chains), and also the fluorinated alkyl chains such as, for example, heptadecafluorooctyl sulfonyl amino ethyl CF 3 - (CF2) 7-SO2-N (C2H5) -CH2-CH2; or -CH2-CH2-CN, succinimido, maleimido, mesityl, tosyl, triethoxysilane or phthalimide chains.

Preferably, the monomers of formula (I) are such that: - x = 1 and Z represents COO, - m = 0, - n = 6 to 120 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.

Preferably, the monomers of formula (I) have a molecular weight of between 300 and 5000 g / mol.

Among the particularly preferred monomers of formula (I), mention may be made of: 7 - poly (ethylene glycol) (meth) acrylate in which 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) (meth) acrylate, in which R 1 is H or methyl, Z is COO, x 5 = 1, m = 0 and R3 = 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 (methoxy-poly (ethylene glycol 550) methacrylate, supplied by SARTOMER Chemicals - M90G (methacrylate methoxy-poly (ethylene glycol (9 repeating units)) and M230G (methoxy-polyethylene glycol methacrylate (23 repeating units)) available from Shin-Nakamura Chemicals - methoxy-poly (ethylene glycol) methacrylates 300, 475 or 1100 Molecular Molecules available from Sigma-Aldrich - Methoxy-Poly (Ethylene Glycol) acrylate of average molecular weight 426 available from Sigma-Aldrich - Available methoxy-poly (ethylene glycol) methacrylates at LAPORTE under the trade names: MPEG 350, MPEG 550, S100W, S20W, or at Cognis under the name BISOMER - poly (ethylene glycol) monomethyl ether, mono (succinimidyl succinate) ester of molecular weight medium 1900 or 5000, from Polysciences - behenyl poly (ethylene glycol PEG-25) 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 8000, 4000, 2000 methacrylates from Monomer & Polymer Dajac laboratories. - Methoxy-poly (ethylene glycol) 2000 Norsocryl 402 methacrylate from Arkema - Arkema's methoxy-poly (ethylene glycol) 5000 Norsocryl 405 methacrylate - Aldrich poly (ethylene glycol) methyl ether acrylate, Mn = 454 g / mol, DP = 8-9 The most preferred monomers of formula (I) are chosen from poly (ethylene glycol) (meth) acrylates and alkyl (poly) ethylene glycol (meth) acrylates, more particularly methacrylates of methylpoly (ethylene glycol).

Preferably, the monomer of formula (I) or the mixture of such monomers represents 0.5 to 50% by weight, especially 1 to 30% by weight, or even 2 to 20% by weight, and still more preferably 3 to 15% by weight. by weight, the total weight of monomers used to form the block polymer according to the invention.

The monomer of formula (I) may be present in a soluble sequence, in an insoluble sequence or in all the sequences. Preferably, it is present in a soluble sequence or better in the set of soluble sequences.

The sequenced polymer according to the invention therefore preferably comprises a first sequence soluble in the carbonaceous dispersion medium and at least a second sequence, insoluble in said medium.

The soluble sequence preferably comprises 50 to 100% by weight of monomer (s) soluble in said medium, in particular 60 to 90% by weight, and more preferably 70 to 80% by weight of monomer (s). soluble (s), alone or in admixture; and 0 to 50% by weight, especially 10 to 40% by weight, or even 20 to 30% by weight of monomer (s) insoluble (s) in said medium, alone or in mixture.

Similarly, the insoluble sequence preferably comprises 50 to 100% by weight of monomer (s) insoluble in said medium, especially 60 to 90% by weight, and more preferably 70 to 80% by weight of insoluble monomer (s), singly or in combination; and 0 to 50% by weight, especially 10 to 40% by weight, or even 20 to 30% by weight of monomer (s) soluble (s) in said medium, alone or in mixture. By monomer soluble in the medium is meant any monomer whose homopolymer is in soluble form that is to say completely dissolved at a concentration greater than or equal to 5% by weight at room temperature (20 ° C.) in said middle. By insoluble monomer is therefore meant any monomer whose homopolymer is not in soluble form that is to say completely dissolved at a concentration greater than or equal to 5% by weight at ambient temperature (20 ° C.) in said medium. However, the insoluble monomers can, as monomers, be soluble in the medium under consideration, provided that they become insoluble after polymerization.

In any case, the proportion of soluble sequence and insolubilic block in the block polymer should be such that said polymer can form a polymeric micelle. Preferably, the insoluble block (or insoluble blocks) represents 30 to 97% by weight of the total weight of the copolymer, in particular 40 to 95% by weight, or even 50 to 90% by weight, in particular 55 to 80% by weight. weight, and even more preferably from 60 to 75% by weight. The soluble sequence (or the soluble sequences) therefore preferably represents 3 to 70% by weight of the total weight of the copolymer, in particular 5 to 60% by weight, or even 10 to 50% by weight, in particular 20 to 45% by weight. weight, and even more preferably from 25 to 40% by weight.

As soluble monomer that may be used, the following monomers may be mentioned, alone or as a mixture: methacrylates of formula CH 2 = C (CH 3) -COOR 1 in which R 1 represents a linear or branched C 8 -C 22 alkyl group such as lauryl, behenyl or stearyl; or a cyclic alkyl group having 8 to 30 carbon atoms, such as isobornyl; or else R 1 represents the tert-butyl group; acrylates of formula CH2 = CH-OOOR2 in which R2 represents a linear or branched C8-C22 alkyl group such as lauryl, behenyl or stearyl or 2-ethylhexyl; or a cyclic alkyl group having 8 to 30 carbon atoms, such as isobornyl; or R2 is an isobutyl group; the (meth) acrylamides of formula CH2 = C (CH3) -CONR3R4 or CH2 = CH-CONR3R4, in which R3 represents a hydrogen atom or a linear or branched C1-C12 alkyl group, and R4 represents an alkyl group linear or branched C8-C12, such as isooctyl, isononyl, undecyl; di-n-alkylitaconates of formula CH 2 = C (CH 2 -COO (CH 2) n -CH 3) -COO (CH 2) n-1-CH 3, with n being an integer greater than or equal to 5, in particular from 5 to 12; vinyl esters of formula R 5 -CO-O-CH =CH 2 where R 5 represents a linear or branched C 8 to C 22 alkyl group; - ethers of vinyl alcohol and alcohol of formula R6O-CH = CH2 wherein R6 represents a linear or branched alkyl group comprising from 8 to 22 carbon atoms; the ethylenic monomers whose ester group contains silanes or siloxanes, and containing only one silicon atom such as (meth) acryloxypropyltrimethoxysilane; carbon-containing macromonomers having a polymerizable terminal group; The term "macromonomer having a polymerizable terminal group" means any oligomer having on one of its ends a polymerizable terminal group capable of reacting during the polymerization reaction with ethylenic monomers. The polymerizable group of the macromonomer may advantageously be an ethylenically unsaturated group capable of polymerizing by a radical route. Said polymerizable end group may in particular be a vinyl or (meth) acrylate group (or (meth) acryloxy), and preferably a (meth) acrylate group. By "carbon-based macromonomer" is meant a non-silicone macromonomer, and in particular an oligomeric macromonomer obtained by polymerization of ethylenically unsaturated monomer (s), and mainly by polymerization of acrylic and / or non-acrylic vinyl monomers.

As carbonaceous macromonomers having a polymerizable terminal group, mention may be made in particular of: - (i) C 6 -C 22, preferably C 8 -C 18, linear or branched (meth) acrylate homopolymers and copolymers having an end group polymerizable agent chosen from vinyl or (meth) acrylate groups, among which mention may be made in particular of poly (2-ethylhexyl acrylate) macromonomers with a mono (meth) acrylate end; poly (dodecyl acrylate) or poly (dodecyl methacrylate) macromonomers having a mono (meth) acrylate end; macromonomers of poly (stearyl acrylate) or poly (stearyl methacrylate) with a mono (meth) acrylate end.

Such macromonomers are in particular described in patents EP895467 and EP96459 and in the article Gillman, Polymer Letters, Vol 5, page 477-481 (1967). In particular, mention may be made of macromonomers based on poly (2-ethylhexyl acrylate) or poly (dodecyl acrylate) with a mono (meth) acrylate end. (ii) polyolefins having an ethylenically unsaturated terminal group, in particular those having a (meth) acrylate end group. As examples of such polyolefins, mention may be made in particular of the following macromonomers, it being understood that they have a terminal (meth) acrylate group: polyethylene macromonomers, polypropylene macromonomers, polyethylene / polypropylene copolymer macromonomers, polyethylene / polybutylene copolymer, polyisobutylene macromonomers; polybutadiene macromonomers; polyisoprene macromonomers; poly (ethylene / butylene) -polyisoprene macromonomers; Such macromonomers are in particular described in EP 1347013 or in US Pat. No. 5,625,005, which mentions ethylene / butylene and ethylene / propylene macromonomers with a (meth) acrylate reactive end group. In particular, mention may be made of poly (ethylene / butylene) methacrylate, such as that sold under the name Kraton Liquid L-1253 by Kraton Polymers.

Particularly preferred soluble monomers are: methacrylates of formula CH 2 = C (CH 3) -OROR 1 in which R 1 represents a linear or branched C 8 -C 22 alkyl group such as lauryl, behenyl or stearyl; or a cyclic alkyl group having 8 to 30 carbon atoms, such as isobornyl; or else R, represents the tert-butyl group; acrylates of formula CH2 = CH-COOR2 in which R2 represents a linear or branched C8-C22 alkyl group such as lauryl, behenyl, 2-ethylhexyl or stearyl; or a cyclic alkyl group having 8 to 30 carbon atoms, such as isobornyl; or R2 is an isobutyl group; and their mixtures.

Mention may be made in particular of 2-ethylhexyl acrylate, isobornyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, behenyl (meth) acrylate, isobutyl acrylate and t-butyl methacrylate, and mixtures thereof. As the insoluble monomer that may be used, the following monomers, as well as their salts and their mixtures, may be mentioned, alone or as a mixture:

(i) (meth) acrylates of formula: ## STR2 ## wherein R '1 represents a group chosen from: a linear or branched alkyl group; , comprising from 1 to 6 carbon atoms, said group possibly comprising in its chain one or more heteroatoms chosen from O, N and S; and / or which may comprise one or more substituents chosen from -OH, the halogen atoms (F, Cl, Br, I) and -NR'R "with R 'and R", which may be identical or different, chosen from among the alkyls linear or branched C1-C4; this definition excludes tert-butyl methacrylate and isobutyl acrylate. a cyclic alkyl group comprising from 3 to 6 carbon atoms, said group possibly comprising in its chain one or more heteroatoms chosen from O, N and S, and / or possibly containing one or more substituents chosen from OH and the atoms of halogen (F, Cl, Br, I); As examples of R'1, there may be mentioned methyl, ethyl, propyl, butyl, methoxyethyl, ethoxyethyl, trifluoroethyl, 2-hydroxyethyl, 2-hydroxypropyl, dimethylaminoethyl, diethylaminoethyl, dimethylaminopropyl. (Ii) (meth) acrylamides of formula: ## STR2 ## in which: different, represent a hydrogen atom or an alkyl group, linear or branched, having from 1 to 6 carbon atoms, which may comprise one or more substituents chosen from -OH, the halogen atoms (F, Cl, Br, I) and -NR'R "with R 'and R", which may be identical or different, chosen from linear or branched C1-C4 alkyls; or R'3 represents a hydrogen atom and R'4 represents a 1,1-dimethyl-3-oxobutyl group; As examples of alkyl groups which may constitute R'3 and R'4, mention may be made of n-butyl, t-butyl, n-propyl, dimethylaminoethyl, diethylaminoethyl and dimethylaminopropyl.

(iii) ethylenically unsaturated monomers containing at least one carboxylic, phosphoric or sulphonic acid function, such as crotonic acid, maleic anhydride, itaconic acid, fumaric acid, maleic acid, styrenesulfonic acid, vinylbenzoic acid, vinylphosphoric acid, acrylic acid, methacrylic acid, acrylamidopropanesulfonic acid, and their salts;

(iv) vinyl esters of formula: R '6 -COO-CH = CH 2 in which R' 6 represents a linear or branched alkyl group comprising from 1 to 6 atoms, or a cyclic alkyl group containing from 3 to to 6 carbon atoms and / or an aromatic group, for example of benzene, anthracene, and naphthalenic type;

(v) monomers containing ethylenic unsaturation (s) comprising at least one tertiary amine function, such as 2-vinylpyridine, 4-vinylpyridine, and mixtures thereof.

- (vi) styrene and its derivatives; (vii) di-n-alkylitaconates of formula CH2 = C (CH2-000 (CH2) n-1-CH3) -COO (CH2) n1-CH3, where n is an integer of 0 to 4;

(viii) ethylenic monomers whose ester group contains silanes, silsesquioxanes, siloxanes, carbosiloxane dendrimers as described in patent EP 0 963 751, with the exception of monomers containing only one silicon atom such as than methacryloxypropryl trimethoxysilane. Preferred monomers are (meth) acryloxypropyltris (trimethylsiloxy) silane, (meth) acryloxypropylbis (trimethylsiloxy) methylsilane, (meth) acryloxymethyltris (trimethylsiloxy) silane, and (meth) acryloxymethylbis (trimethylsiloxy) methylsilane. (ix) PDMS macromonomers, such as polydimethylsiloxanes having a terminal group monoacryloyloxy or monomethacryloyloxy, and in particular having the following formula: ## STR1 ## in which: R 8 denotes a hydrogen atom or a methyl group; ; preferably methyl; - R9 denotes a divalent hydrocarbon group, linear or branched, preferably linear, having from 1 to 10 carbon atoms and optionally containing one or two -O- ether bonds; preferably ethylene, propylene or butylene; R10 denotes a linear or branched alkyl group having from 1 to 10 carbon atoms, especially from 2 to 8 carbon atoms; preferably methyl, ethyl, propyl, butyl or pentyl; n denotes an integer ranging from 1 to 300, preferably ranging from 3 to 200, and preferably ranging from 5 to 100. It is possible in particular to use monomethacryloyloxypropyl polydimethylsiloxanes such as those sold under the name PS560-K6 by UCT (Uni - ted Chemical Technologies Inc.) or under the name MCR-M17 by Gelest Inc.

(x) oligopeptides functionalized with a (meth) acrylate function.

Among the salts, mention may be made of those obtained by neutralization of acid groups with the aid of inorganic bases such as sodium hydroxide, potassium hydroxide, ammonium hydroxide or organic bases of aminoalcohol type such as monoethanolamine, diethanolamine, triethanolamine, 2-methyl-2-amino-1-propanol.

Mention may also be made of the salts formed by neutralization of the tertiary amine units, for example with the aid of mineral or organic acid. Among the mineral acids, mention may be made of sulfuric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, phosphoric acid and boric acid. Among the organic acids, there may be mentioned acids containing one or more carboxylic, sulfonic or phosphonic groups. It may be linear, branched or cyclic aliphatic acids or aromatic acids. These acids may comprise, in addition, one or more heteroatoms chosen from O and N, for example in the form of hydroxyl groups. There may be mentioned in particular acetic acid, propionic acid, terephthalic acid, citric acid and tartaric acid.

Particularly preferred insoluble monomers that may be mentioned are: (meth) acrylates of formula: CH 2 = C (CH 3) -COOR ', or CH 2 = CH-COOR', and in particular methyl (meth) acrylates, ethyl, propyl, butyl; isobutyl methacrylate; methoxyethyl or ethoxyethyl (meth) acrylates; trifluoroethyl methacrylate; dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl acrylate; monomers containing ethylenic unsaturation (s) comprising at least one carboxylic acid function, and in particular (meth) acrylic acid and its salts; - maleic anhydride; the ethylenic monomers whose ester group contains silanes; polydimethylsiloxanes having a monoacryloyloxy or monomethacryloyloxy end group, of the following formula: ## STR2 ## in which: R 8 denotes a hydrogen atom or a methyl group; preferably methyl; - R9 denotes a divalent hydrocarbon group, linear or branched, preferably linear, having from 1 to 10 carbon atoms and optionally containing one or two -O- ether bonds; preferably ethylene, propylene or butylene; R 10 denotes a linear or branched alkyl group having from 1 to 10 carbon atoms, especially from 2 to 8 carbon atoms; preferably methyl, ethyl, propyl, butyl or pentyl; n denotes an integer ranging from 1 to 300, preferably ranging from 3 to 200, and preferably ranging from 5 to 100.

More particularly, mention may be made of methyl (meth) acrylate, ethyl (meth) acrylate, (meth) acrylic acid, maleic anhydride, (meth) acryloxypropyltris (trimethylsiloxy) silane, (meth) acryloxypropyl bis (trimethylsiloxy) methylsilane, (meth) acryloxymethyltris (trimethylsiloxy) silane, and (meth) acryloxymethylbis (trimethylsiloxy) methylsilane. Preferably, the block polymer according to the invention comprises, besides the monomers of formula (I), 5 to 50% by weight, in particular 10 to 45% by weight, or even 15 to 40% by weight, and even more preferably 20 to 40% by weight. 35% by weight, of soluble monomers, and 40 to 90% by weight, especially 50 to 85% by weight, or even 55 to 80% by weight, and more preferably 60 to 75% by weight, of insoluble monomers, the% being given in relation to the total weight of monomers constituting the polymer.

The dispersion according to the invention also comprises a liquid carbon medium in which the particles of sequenced polymer are dispersed. By liquid medium is meant in particular a medium preferably having a viscosity of less than or equal to 7000 centipoise at 20 ° C. According to the invention, the medium is carbon-based if it comprises at least 50% by weight, in particular from 50 to 100% by weight, for example from 60 to 99% by weight, or from 65 to 95% by weight, from 70 to 90% by weight, relative to the total weight of the carbonaceous medium, of carbon compound, liquid at 25 ° C., having an overall solubility parameter according to the HANSEN solubility space of less than or equal to 20 (MPa) 112, or a mixture of such compounds.

The overall solubility parameter 8 according to the solubility space of Hansen is defined in the article "Solubility parameter values" of Grulke, in the work "Polymer Handbook" 3rd edition, Chapter VII, pages 519-559 by the relation: 8 = (dp2 + dp2 + dH2) 1/2 in which: - dD characterizes the LONDON dispersion forces resulting from the formation of dipoles induced 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 three-dimensional solubility space according to HANSEN is described in the HANSEN article: "The three dimensional solubility parameters" J. Paint Technol. 39, 105 (1967).

Among the liquid carbon compounds having an overall solubility parameter according to the HANSEN solubility space less than or equal to 20 (MPa) 112, mention may be made of liquid fatty substances, in particular oils, which may be chosen from natural oils or synthetic, carbonaceous, hydrocarbon, optionally fluorinated, optionally branched, alone or in mixture. In particular, mention may be made of: vegetable oils formed by esters of fatty acids and of polyols, in particular triglycerides, such as sunflower oil, sesame or rapeseed oil, macadamia oil, soybean oil, sweet almond oil, calophyllum, palm oil, grape seed oil, maize, arara, cotton, apricot, avocado, jojoba, olive or cereal seed; linear, branched or cyclic esters having more than 6 carbon atoms, especially 6 to 30 carbon atoms; and especially isononyl isononanoate; and more particularly 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 the palmitates, adipates, myristates and benzoates, especially diisopropyl adipate and isopropyl myristate; hydrocarbons and especially linear, branched and / or cyclic alkanes, which are volatile or non-volatile, such as C 5 -C 60 isoparaffins, which may be volatile, such as isododecane, Parleam (hydrogenated polyisobutene), isohexadecane or cyclohexane; , or the 'ISOPARs'; or paraffin oils, petroleum jelly, or hydrogenated polyisobutylene. ethers having 6 to 30 carbon atoms; ketones having 6 to 30 carbon atoms. aliphatic fatty alcohols having 6 to 30 carbon atoms, the hydrocarbon chain not containing a substitution group, such as oleic alcohol, decanol, dodecanol, octadecanol, octyldodecanol and linoleic alcohol; polyols in particular having 6 to 30 carbon atoms, such as hexylene glycol; - their mixtures.

Preferably, the carbonaceous medium comprises at least one carbon compound chosen from vegetable oils formed by esters of fatty acids and of polyols, in particular triglycerides, 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 having from 3 to 20 carbon atoms; linear or branched C8-C60 alkanes, volatile or non-volatile; cyclic, non-aromatic, C 5 -C 12 alkanes; volatile or non-volatile; ethers having 7 to 30 carbon atoms; Ketones having 8 to 30 carbon atoms; aliphatic fatty monoalcohols having 12 to 30 carbon atoms, the hydrocarbon chain having no substitution group, and mixtures thereof.

Preferably, the carbonaceous medium comprises at least, as carbon compound, isopropyl myristate, octyldodecanol, isoparaffins C5-C60, isohexadecane, isononyl isononanoate, isododecane, Parleam .

The carbonaceous medium may optionally comprise additional liquid compounds which may be present in an amount strictly less than 50% by weight, in particular from 1 to 40% by weight, or even from 5 to 35% by weight, or from 10 to 10% by weight. at 30% by weight, relative to the total weight of the carbon medium, and chosen from, alone or as a mixture: volatile or nonvolatile silicone oils, alone or as a mixture; In particular, mention may be made of polydimethylsiloxanes and polymethylphenylsiloxanes, optionally substituted with optionally fluorinated aliphatic and / or aromatic groups, and / or containing functional groups such as hydroxyl, thiol and / or amine groups; and volatile silicones, in particular cyclic or linear silicones, such as cyclodimethylsiloxanes, cyclophenylmethylsiloxanes and linear dimethylsiloxanes, among which mention may be made of linear dodecamethylpentasiloxane (L5), octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, hexadecamethylcyclohexasiloxane and heptamethylhexyltrisiloxane; , heptamethyloctyltrisiloxane. esters having 2 to 5 carbon atoms, ethers having 2 to 6 carbon atoms, ketones 1 to 5 carbon atoms, monoalcohols having 1 to 5 carbon atoms.

However, according to a particular embodiment of the invention, the carbon medium does not contain additional liquid compounds.

The choice of the carbonaceous 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 destination of the composition.

Among the very particularly preferred dispersions, mention may be made of the particle dispersions of the following polymers, in particular in alkanes and in particular in isododecane: poly (2-ethylhexyl acrylate) -b-poly (methyl acrylate-coconut) PEG (meth) acrylate) -poly (PEG) 2-ethylhexyl-co- (meth) acrylate-b-methyl polyacrylate-poly (PEG 2-ethylhexyl-co- (meth) acrylate acrylate) - b-poly (PEG methyl acrylate-co- (meth) acrylate) - poly (2-ethyl hexyl acrylate-co-isobornyl acrylate) -b-poly (methyl acrylate-co- (meth) acrylate) PEG) -poly (PEG) -b-poly (methyl acrylate) -poly (2-ethyl hexyl acrylate-co-acrylate) isobornyl acrylate-co- (meth) acrylate poly-acrylate isobornyl-co- (meth) acrylate PEG) -b-poly (methyl acrylate-co- (meth) acrylate PEG) - poly (isobornyl acrylate) -b-poly (methyl acrylate-co- PEG (meth) acrylate) - poly (isobornyl acrylate-co- (meth) acrylate G) -b-methyl polyacrylate-poly (isobornyl acrylate-PEG co- (meth) acrylate) -b-poly (methyl acrylate-PEG co- (meth) acrylate) - poly (isobutyl acrylate) b) poly (PEG methyl acrylate-co- (meth) acrylate) -poly (PEG) -b-poly (methyl) acrylate polyisocyanate-poly (isobutyl acrylate) -poly (isobutyl acrylate) PEG- (meth) acrylate-b-poly (PEG) methyl acrylate-co- (meth) acrylate - poly (isobutyl acrylate-isobornyl acrylate) -b-poly (methyleco acrylate) PEG (meth) acrylate) -poly (PEG) -bpoly (methyl acrylate) -poly (isobutyl acrylate-co-acrylate isobutyl-co-acrylate-co-acrylate-co-acrylate) isobornyl-co- (meth) acrylate PEG) -bpoly (methyl acrylate-co- (meth) acrylate PEG) - poly (isobutyl acrylate-co-2-ethyl hexyl acrylate) -b-poly (PEG methyl acrylate-co- (meth) acrylate) - poly (PEG) -b-poly (methyl acrylate) 2-ethylhexyl-co- (meth) acrylate-isobutyl acrylatepoly (PEG) -b-poly (PEG) methyl acrylate-2-ethylhexyl-co- (meth) acrylate, isobutyl acrylate-poly (acrylate) - poly (2- acrylate) PEG) -b-poly (methyl) -poly (poly) methyl acrylate-b-poly (PEG) 2-ethylhexyl acrylate-poly (meth) acrylate-poly (2-ethylhexyl acrylate) -b-poly (PEG) -b-poly (2-ethylhexyl acrylate) -poly (PEG) -poly (2-ethylhexyl acrylate) -b-poly (PEG) -b-poly (acrylate) PEG) -b-poly (PEG) 2-ethylhexyl-co- (meth) acrylate-methyl- (meth) acrylate-poly (2-ethylhexyl acrylate-co-isobornyl-co-acrylate acrylate) PEG (meth) acrylate) -b-methyl polyacrylate-b-poly (PEG) isobornyl-co- (meth) acrylate 2-ethylhexyl acrylate-acrylate - poly (2-ethylhexyl acrylate-co) isobornyl acrylate) -b-poly (methyl acrylate-co- (meth) acrylate PEG) -b-poly (2-ethylhexyl acrylate-isobornyl co-acrylate) - poly (2-ethylhexyl acrylate) co isobornyl-co- (PEG) -beta (meth) acrylate-b-poly (PEG) -b-poly (methyl acrylate-co- (meth) acrylate) -poly (2-ethylhexyl acrylate-isobornyl co-acrylate PEG -co- (meth) acrylate) -poly (isobornyl acrylate-PEG-co- (meth) acrylate) -b-poly-methyl-polyacrylate-poly (isobornyl acrylate-co- (meth) acrylate PEG) - poly (isobornyl acrylate) -b-poly (PEG) -b-poly (isobornyl acrylate) -poly (methyl acrylate) -poly (isobornyl acrylate) PEG) -b-poly (PEG) -b-poly (PEG) methyl acrylate-co- (meth) acrylate (PEG isobornyl acrylate-co- (meth) acrylate) - poly (isobutyl acrylate) PEG) -b-poly-methyl poly-acrylate-poly-bis (polyacrylate) PE-poly (isobutyl acrylate-co- (meth) acrylate) - poly (isobutyl acrylate) -b-poly (methyl acrylate) PEG-poly (meth) acrylate-b-poly (isobutyl acrylate) -poly (PEG) isobutyl acrylate-co- (meth) acrylate-b-poly (methyleco- (meth) acrylate acrylate PEG) -b-poly (isobutyl acrylate) PEG -co- (meth) acrylate) -poly (isobutyl acrylate-co-isobornyl acrylate-co- (meth) acrylate of EG) -bypolyacrylate of methyl-b-poly (isobutyl acrylate-co PEG isobornyl-co- (meth) acrylate acrylate - poly (isobutyl acrylate-co-isobornyl acrylate) -b-poly (PEG) -b-poly methyleco- (meth) acrylate acrylate (isobutyl acrylate-co-isobornyl acrylate) - poly (isobutyl acrylate-co-isobornyl acrylate-co- (meth) acrylate) -bpoly (methyl acrylate-co- (meth) acrylate PEG) -b-poly (isobutyl acrylate-isobornyl co-acrylate -co- (meth) acrylate) - poly (isobutyl acrylate-2-ethylhexyl co-acrylate-co- (meth) PEG acrylate) -b-methyl polyacrylate-b-poly (isobutyl acrylate-co-2-ethylhexyl acrylate-PEG co- (meth) acrylate) - poly (isobutyl acrylate-co-acrylate) ethyl-hexyl) -b-poly (methyl acrylate-co- (meth) acrylate of PEG) -b-poly (isobutyl acrylate-co-2-ethylhexyl acrylate) - poly (isobutyl acrylate) -ACR PEG) -b-poly (PEG) -b-poly (PEG) -b-poly (methyl acrylate-co- (meth) acrylate) 2-ethylhexyl ylate (2-ethylhexyl acrylate-isobutyl acrylate) -co- (meth) acrylate PEG).

The dispersion according to the invention preferably has a solids content of between 5 and 80% by weight, in particular 8 to 70% by weight, or even 10 to 60%, or even 15 to 50% by weight, and more preferably 18 to 50% by weight. 30% by weight.

The polymer dispersion may be manufactured by any means known to those skilled in the art, and in particular by controlled radical polymerization or by living polymerization, in particular by the techniques known as nitroxydes / alkoxyamines, ATRP, organo-cobalt, RAFT / MADIX, degenerative transfer, TERP (tellurium), with Selenium, by Iniferter, or by any method of living polymerization (anionic or cationic), by metallocene, by ring opening metathesis polymerization (ROMP), by cationic or anionic ROP (ring opening polymerization), by GTP (group transfer polymerization), by tetraphenylethane derivatives, by diphenylethylene. The techniques used for the formation of each sequence may be the same or different.

A typical method may be to prepare the first, generally soluble, sequence in the carbon medium of the dispersion, by polymerization of the monomer (s), a control agent and an initiator if necessary. Then, the monomer or monomers of the second, generally insoluble, sequence are added in the presence or absence of an initiator. The reaction temperature is preferably from -30 to 200 ° C, preferably from 0 to 160 ° C and more preferably from 40 to 140 ° C. Additional sequences can be polymerized by the same method. For each of the sequences, the monomer (s) may be added simultaneously, batchwise, semi-continuously or consecutively. Multiblock polymers will then be obtained.

If the first sequence is synthesized in bulk, the second sequence can then be synthesized in bulk or in solution. The solvent may be a carbonaceous solvent as defined in the present application, which leads to the polymer synthesis being terminated at a dispersion of said polymer directly in the carbonaceous medium. The solvent employed can also be a solvent common to all the sequences; in this case, the subsequent addition of a carbonaceous solvent as defined above and the possible elimination of the common solvent will lead to the desired dispersion in the carbon medium. If all the polymer is synthesized in bulk, the addition of a carbonaceous solvent as defined above will lead to the desired dispersion. If all the sequences are synthesized in solution, in a common solvent, the subsequent addition of a carbonaceous solvent as defined above and the optional removal of the common solvent will lead to the desired dispersion in the carbonaceous media. It is also possible at this stage to remove the common solvent in order to recover the polymer alone and before dispersing it in a carbonaceous solvent as defined above, which will lead to the desired dispersion. Finally, if all the sequences are synthesized directly in a carbon-based solvent as defined above, the dispersion is obtained directly in a single step. This latter method is the one used preferentially. Once the dispersion has been obtained, it is possible to change the carbonaceous medium by elimination / addition of a new carbonaceous solvent or by addition / optional elimination of the first solvent.

Preferably, the first sequence is prepared by controlled radical polymerization (PRC), the second sequence may also be prepared by PRC or by conventional polymerization. A second preferred procedure consists in synthesizing the soluble sequence in bulk, in solubilizing it in a carbonaceous solvent according to the invention, then in synthesizing the insoluble sequence in this carbonaceous solvent; a dispersion of the polymer in the carbonaceous solvent is thus obtained directly. In a particular embodiment of the invention, once the dispersion has been obtained, it is possible to add one or more monomers C whose homopolymers are either of the soluble type or of the insoluble type, according to the definition given above. high, and preferably insoluble, in the medium, in order to continue the polymerization on the AB block copolymers already formed, which leads to the formation of triblock copolymers ABC. The additional monomer (s) C may be present in an amount such that the amounts of total soluble and insoluble monomers remain in the above-mentioned total ranges. In the case where the starting polymer is a triblock of structure A-B-A, the polymerization of C can lead to a pentabloc of structure C-A-B-A-C or A-B-CB-A, according to the polymerization technique and / or the transfer agent used. The polymerization initiator may be any initiator known to those skilled in the art for radical polymerization (peroxides, azo, redox couple, photochemical). In the case of certain controlled radical polymerization techniques, the same compound may have the role of initiating the polymerization and being the control agent as is the case of alkoxyamines. For non-radical polymerizations, that is to say ionic (anionic or cationic), one skilled in the art can choose the appropriate initiator.

Block polymers are thus obtained which self-organize in dispersion in the medium under consideration. They are preferably composed of a first soluble sequence, a second insoluble sequence, and optionally, but preferably, a third soluble sequence, identical to or different from the first soluble sequence, but preferably identical. This structure will cause a self-organization of the polymer chains so as to form particles having at the interface with the medium the soluble sequences, and at the heart of the particle the insoluble sequences. Once the dispersion obtained, it is possible to add dispersants, stabilizers, to modify the physicochemical properties (viscosity, Tg, etc.).

The dispersions according to the invention find a very particular application in cosmetics. Thus, they may be present in the cosmetic compositions according to the invention in an amount of 0.1 to 90% by weight, preferably 0.5 to 80% by weight, in particular 1 to 75% by weight, or even 5-70% by weight. % by weight, of dispersion relative to the total weight of the composition.

The cosmetic compositions according to the invention also comprise a cosmetically acceptable medium, that is to say compatible with keratin materials such as the skin of the face or the body, the lips, the hair, the eyelashes, the eyebrows and nails.

The composition may advantageously comprise a fatty phase, which may itself comprise oils and / or preferably lipophilic solvents, as well as solid fatty substances at ambient temperature such as waxes, pasty fatty substances, gums and their mixtures. . Among the constituents of the fatty phase, mention may be made of volatile or nonvolatile oils, which may be chosen from natural or synthetic, carbonaceous, hydrocarbon, fluorinated or optionally branched oils, alone or as a mixture.

The term "non-volatile oil" means an oil capable of remaining on the skin at ambient temperature and atmospheric pressure for at least one hour and having in particular a vapor pressure at room temperature (25 ° C.) and atmospheric pressure, which is not zero, less than at 0.01 mmHg (1.33 Pa). Non-volatile carbonaceous oils, in particular hydrocarbon-based oils, of plant, mineral, animal or synthetic origin, such as liquid paraffin (or petrolatum), squalane, hydrogenated polyisobutene (Parleam), perhydrosqualene, mink oil, macadamia oil, turtle oil, soy oil, sweet almond oil, calophyllum oil, palm oil, grape seed oil, sesame oil, corn oil, arara oil, rapeseed oil, rapeseed oil sunflower, cotton, apricot, castor oil, avocado, jojoba, olive or cereal sprouts, shea butter; linear, branched or cyclic esters having more than 6 carbon atoms, especially 6 to 30 carbon atoms, such as the lanolic acid, oleic acid, lauric acid and stearic acid esters; esters derived from acids or alcohols with a long chain (that is to say having from 6 to 20 carbon atoms), in particular esters of formula RCOOR 'in which R represents the residue of a higher fatty acid comprising 7 to 19 carbon atoms and R 'represents a hydrocarbon chain comprising from 3 to 20 carbon atoms, in particular the C 12 -C 36 esters, such as isopropyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, diisopropyl adipate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-hexyl-decyl laurate, 2-octyl-decyl palmitate, myristate or 2-octyl-dodecyl lactate, di (2-ethyl hexyl) succinate, diisostearyl malate, glycerin or diglycerine triisostearate; higher fatty acids, especially C14-C22 fatty acids, such as myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid or isostearic acid; higher fatty alcohols, especially C16-C22, such as cetanol, oleic alcohol, linoleic or linolenic alcohol, isostearyl alcohol or octyl dodecanol; and their mixtures. Decanol, dodecanol, octadecanol, liquid triglycerides of fatty acids of 4 to 10 carbon atoms such as triglycerides of heptanoic or octanoic acids, triglycerides of caprylic / capric acids may also be mentioned; linear or branched hydrocarbons of mineral or synthetic origin, such as liquid paraffins and derivatives thereof, petroleum jelly, polydecenes, hydrogenated polyisobutene such as parleam; esters and synthetic ethers, in particular of fatty acids, for example purcellin oil, isopropyl myristate, 2-ethylhexyl palmitate, octyl-2-dodecyl stearate, erucate octyl-2-dodecyl, isostearyl isostearate; hydroxylated esters such as isostearyl lactate, octyl hydroxystearate, octyldodecyl hydroxystearate, diisostearyl malate, triisocetyl citrate, heptanoates, octanoates, decanoates of fatty alcohols; polyol esters such as propylene glycol dioctanoate, neopentyl glycol diheptanoate, diethylene glycol diisononanoate; and pentaerythritol esters; fatty alcohols having 12 to 26 carbon atoms such as octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol. Mention may also be made of ketones which are liquid at ambient temperature, such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, isophorone, cyclohexanone and acetone; propylene glycol ethers which are liquid at room temperature, such as propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate or dipropylene glycol mono-butyl ether; short chain esters (having from 3 to 8 carbon atoms in total) such as ethyl acetate, methyl acetate, propyl acetate, n-butyl acetate, isopentyl; ethers which are liquid at ambient temperature, such as diethyl ether, dimethyl ether or dichlorodiethyl ether; alkanes that are liquid at room temperature, such as decane, heptane, dodecane, isododecane, isohexadecane or cyclohexane; aromatic cyclic compounds which are liquid at room temperature, such as toluene and xylene; aldehydes which are liquid at room temperature, such as benzaldehyde and acetaldehyde, and mixtures thereof. Among the volatile compounds that may be mentioned are non-silicone volatile oils, in particular C 8 -C 16 isoparaffins such as isododecane, isodecane and isohexadecane. More preferentially, mention may be made of alkanes which are liquid at room temperature, volatile or otherwise, and more particularly decane, heptane, dodecane, isododecane, isohexadecane, cyclohexane and isodecane, and mixtures thereof.

The fatty phase may be present in a content ranging from 0.01 to 95%, preferably from 0.1 to 90%, more preferably from 10 to 85% by weight, relative to the total weight of the composition, and better from 30 to 80%.

The composition may also comprise a hydrophilic phase comprising water or a mixture of water and hydrophilic organic solvent (s) such as alcohols and in particular linear or branched lower monoalcohols having from 2 to 5 carbon atoms such as ethanol, isopropanol or n-propanol, and polyols such as glycerine, diglycerine, propylene glycol, sorbitol, pentylene glycol, and polyethylene glycols, or alternatively C 2 ethers; and hydrophilic C2-C4 aldehydes. The water or the mixture of water and hydrophilic organic solvents may be present in the composition according to the invention in a content ranging from 0.1 to 80% by weight, relative to the total weight of the composition, and preferably from 1 to 70% by weight.

The composition according to the invention may also comprise waxes and / or gums. For the purposes of the present invention, the term "wax" means a lipophilic compound, solid at room temperature (25 ° C.), with a reversible solid / liquid state change, having a melting point of greater than or equal to 30 ° C. up to 120 ° C. By bringing the wax to the liquid state (melting), it is possible to render it miscible with the oils that may be present and to form a homo-gene mixture microscopically, but by bringing the temperature of the mixture to room temperature, a recrystallization is obtained. wax in the oils of the mixture. The melting point of the wax can be measured using a differential scanning calorimeter (D.S.C.), for example the calorimeter sold under the name DSC 30 by METLER. The waxes may be hydrocarbon-based, fluorinated and / or silicone-based and may be of vegetable, mineral, animal and / or synthetic origin. In particular, the waxes have a melting point greater than 25 ° C. and better still greater than 45 ° C. As waxes that may be used in the composition of the invention, mention may be made of beeswax, carnauba or candelilla wax, paraffin wax, microcrystalline waxes, ceresin or ozokerite; synthetic waxes such as polyethylene or Fischer Tropsch waxes, silicone waxes such as alkyl or alkoxy dimeticone containing from 16 to 45 carbon atoms. The gums are generally high molecular weight polydimethylsiloxanes (PDMS) or cellulose gums or polysaccharides and the pasty substances are generally hydrocarbon compounds such as lanolines and their derivatives or else PDMSs. The nature and quantity of the solid bodies depend on the mechanical properties and textures sought. As an indication, the composition may contain from 0.01 to 50% by weight of waxes, relative to the total weight of the composition and better still from 1 to 30% by weight.

The composition according to the invention may further comprise one or more dyestuffs chosen from water-soluble dyes, liposoluble dyes, and pulverulent dyestuffs such as pigments, nacres, and flakes well known to those skilled in the art. The dyestuffs may be present in the composition in a content ranging from 0.01 to 50% by weight, relative to the weight of the composition, preferably from 0.01 to 30% by weight. By pigments, it is necessary to include particles of any shape, white or colored, mineral or organic, insoluble in the physiological medium, intended to color the composition. By nacres, it is necessary to understand particles of any iridescent form, in particular produced by certain molluscs in their shell or else synthesized. The pigments may be white or colored, mineral and / or organic. Among the inorganic pigments, titanium dioxide, optionally surface-treated, zirconium oxide or cerium oxides, and oxides of zinc, iron (black, yellow or red) or chromium, the violet of manganese, ultramarine blue, chromium hydrate and ferric blue, metal powders such as aluminum powder, copper powder. Among the organic pigments, mention may be made of carbon black, D & C type pigments, and lacquers based on carmine, barium, strontium, calcium and 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 coated with iron oxides, titanium mica coated with, inter alia, blue. ferric oxide or chromium oxide, titanium mica coated with an organic pigment of the aforementioned type as well as pearlescent pigments based on bismuth oxychloride. Among the water-soluble dyes, mention may be made of the disodium salt of a culvert, the disodium salt of alizarin green, quinoline yellow, the trisodium salt of amaranth, the disodium salt of tartrazine, the monosodium salt of rhodamine and the disodium salt. fuchsin, xanthophyll, methylene blue.

The composition according to the invention may furthermore comprise, in addition, one or more fillers, in particular in a content ranging from 0.01% to 50% by weight, relative to the total weight of the composition, preferably ranging from 01% to 30% by weight. By fillers, it is necessary to include particles of any form, colorless or white, mineral or synthetic, insoluble in the medium of the composition regardless of the temperature at which the composition is manufactured. These fillers serve in particular to modify the rheology or the texture of the composition. The fillers can be mineral or organic of any form, platelet, spherical or oblong, irrespective of the crystallographic form (for example sheet, cubic, hexagonal, orthorhombic, etc.). Mention may be made of talc, mica, silica, kaolin, polyamide (nylon) powders (Orgasol from Atochem), poly-3-alanine and polyethylene, tetrafluoroethylene polymer powders (Teflon), lauroyl-lysine, starch, boron nitride, polymeric hollow microspheres such as those of polyvinylidene chloride / acrylonitrile such as Expancel (Nobel Industrie), acrylic acid copolymers (Polytrap Dow Corning) and silicone resin microspheres (Toshiba Tospearls, for example), elastomeric polyorganosiloxane particles, precipitated calcium carbonate, magnesium carbonate and hydrocarbonate, hydroxyapatite, hollow silica microspheres (Silica Beads from Maprecos ), the microcapsules of glass or ceramic, metal soaps derived from organic carboxylic acids having from 8 to 22 carbon atoms, preferably from 12 to 18 carbon atoms, for example stea spleen of zinc, magnesium or lithium, zinc laurate, magnesium myristate.

The composition may further comprise an additional polymer such as a film-forming polymer. According to the present invention, the term "film-forming polymer" means a polymer capable of forming on its own or in the presence of an auxiliary film-forming agent, a continuous and adherent film on a support, in particular on keratin materials. Among the film-forming polymers that may be used in the composition of the present invention, mention may be made of synthetic polymers, of radical type or of polycondensate type, polymers of natural origin and their mixtures, in particular acrylic polymers, polyurethanes, polyesters, polyamides, polyureas, cellulosic polymers such as nitrocellulose.

The composition according to the invention may also comprise ingredients commonly used in cosmetics, such as vitamins, thickeners, gelling agents, trace elements, softeners, sequestering agents, perfumes, alkalizing or acidifying agents, preservatives, sunscreens, surfactants, antioxidants, anti-hair loss agents, anti-dandruff agents, propellants, ceramides, or mixtures thereof. Of course, those skilled in the art will take care to choose this or these optional compounds, and / or their quantity, in such a way that the advantageous properties of the composition according to the invention are not, or not substantially, altered by the addition envisaged.

The composition according to the invention may be in particular in the form of a suspension, a dispersion, an especially organic solution, a gel or an emulsion, in particular an oil-in-water (O / W) or water-in-oil (E) emulsion. / H), or multiple (W / O / E or polyol / H / E or H / E / H), in the form of cream, paste, foam, dispersion of vesicles including ionic lipids or not, lotion biphase or multiphase, spray, powder, paste, especially soft paste (especially paste having a dynamic viscosity at 25 ° C of the order of 0.1 to 40 Pa.s under a shear rate of 200 sec -1 after 10 minutes of measurement in cone / plane geometry). The composition may be anhydrous, for example it may be an anhydrous paste.

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, of the application envisaged for the composition.

The composition according to the invention may be a makeup composition, especially a complexion product such as a foundation, a blush or an eyeshadow; a lip product such as lipstick, lip gloss or lip care; a concealer product; a blush, a mascara, an eyeliner; an eyebrow makeup product, a lip pencil or an eye pencil; nail product such as nail polish or nail care; a pro-duit body make-up; a hair makeup product (mascara or hairspray). The composition according to the invention may be a composition for protecting or caring for the skin of the face, neck, hands or body, in particular an anti-wrinkle, anti-fatigue composition making it possible to give a boost to the skin. skin, a moisturizing or treating composition; an anti-solar composition or artificial tanning. The composition according to the invention may also be a hair product, in particular for maintaining the hairstyle or shaping the hair. The hair compositions are preferably shampoos, conditioners, gels, styling lotions, blow-drying lotions, fixing and styling compositions such as lacquers or spray. 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. Such forms of packaging are indicated, for example when it is desired to obtain a spray, a mousse for fixing or treating the hair.

The invention finds a most preferred application in the field of makeup, including lipsticks, mascaras, eyeliners, blushers, eyeshadow, foundations.

The invention also relates to a cosmetic treatment process, especially for makeup, cleaning, sunscreen, shaping, coloring, or care of keratin materials, especially 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 above.

The invention is illustrated in more detail in the following examples, given by way of illustration.

EXAMPLE 1 A / Preparation of the Soluble Block In a 100 ml three-neck flask, 26.5 g (4.3 mol / l) of 2-ethylhexyl acrylate, 3.5 × 10 -3 mol / l of initiator are mixed ( Akzo Trigonox 21S), 4.0.10-2 mol / I of control agent (TTC or ethylhexyl trithiocarbamate) of structure below, and 3.5 g (0.22 mol / I) of acrylate polyethylene glycol (Aldrich polyethylene glycol methyl ether acrylate, Mn = 454 g / mol, DP = 8-9). The tricol is closed and the oxygen is removed by bubbling nitrogen for 30 minutes. The flask is then introduced into an oil bath thermostatically controlled at 60 ° C. with stirring at 250 to 300 rpm. The reaction is stopped after 21 hours. The polymer is precipitated twice in cold methanol then is dried under reduced pressure for 24 hours at 25 ° C. TTC structure oo The characteristics of the polymer poly (2-ethylhexyl acrylate-PEG co-acrylate) are presented below: Conversion rate Mn Ps Ip Mn Ls DP (%) * ** *** **** 95 15200 1.13 19620 97 * Mn Ps: number average molecular weight determined by GPC with polystyrene calibration ** Ip = Mw / Mn; Mw and Mn being the average weight and number molar masses, determined by GPC with a polystyrene calibration (Mn Ps and Mw Ps) *** Mn Ls: number-average molecular weight, determined by GPC with light scattering detection . **** DP: degree of polymerization determined from Mn Ls

B / preparation of the polymer In a 100 ml flask, 30 ml of the following mixture are mixed: 2.7 × 10 -3 mol / l of the polymer prepared above, 1.1 × 10 -3 mol of initiator (Trigonox 21S), 1 × 4 mol of methyl acrylate and isododecane so as to have a solids content of 30% by weight. The tricol is closed and the oxygen is removed by bubbling nitrogen for 30 minutes with stirring. The flask is then introduced into a thermostatic oil bath at 80 ° C with stirring at 250 rpm. The reaction is stopped after 4h45min.

A dispersion is obtained in the isododecane of block polymer poly (2-ethylhexyl acrylate-PEG co-acrylate) -b-methyl polyacrylate-b-poly (2-ethylhexyl acrylate-PEG co-acrylate).

The final characteristics of the polymer and the dispersion are presented below: Mn Ls Ip rate *** *** PDI **** conversion (° / O) * ** (nm) 84 62900 1.7 36 0.03 Mn Ls: number average molecular weight determined by GPC with light scattering detection ** Ip = Mw / Mn; Mw and Mn being the average weight and number molar masses determined by GPC with light scattering detection. ***: mean diameter determined by dynamic light scattering (Malvern Zetasizer Nano S90): polydispersity index which translates polydispersity into particle size

The dispersion has a solids content of 26% by weight, is perfectly monodisperse and comprises 3.6% by weight of PEG acrylate, 27.9% by weight of 2-ethylhexyl acrylate and 68% by weight. 4% by weight of methyl acrylate.

Example 2

A 23 ml three-necked flask was mixed with 23.5 g (3.9 mol / l) of 2-ethylhexyl acrylate, 3.9 × 10 -3 mol / l of initiator (Akzo Trigonox 21S), 4.4.10-2 mol / I control agent (TTC or ethylhexyl trithiocarbamate) and 6.5 g (0.44 mol / I) of polyethylene glycol acrylate (Al-drich polyethylene glycol methyl ether acrylate) Mn = 454 g / mol, DP = 8-9). The tricol is closed and the oxygen is removed by bubbling nitrogen for 30 minutes. The flask is then introduced into an oil bath thermostatically controlled at 60 ° C. with stirring at 250 to 300 rpm. The reaction is stopped after 22 hours. The polymer is precipitated twice in cold methanol then is dried under reduced pressure for 24 hours at 25 ° C. The characteristics of the poly (PEG 2-ethylhexyl acrylate-co-acrylate) polymer are presented below: Mn conversion rate Ps Ip Mn Ls DP (%) ** *** **** 96 17400 1, Mn Ps: number average molecular weight determined by GPC with a polystyrene calibration ** Ip = Mw / Mn; Mw and Mn being the average weight and number molar masses, determined by GPC with polystyrene calibration *** Mn Ls: number average molecular weight, determined by GPC with light scattering detection. 30 **** DP: degree of polymerization determined from Mn Ls

30 ml of the following mixture are mixed in a 100 ml flask: 3.9 × 10 -3 mol / l of the polymer prepared above, 1.6 × 10 -3 mol / l of initiator (Trigonox 21S), 2.0 mol Of methyl acrylate and isododecane so as to have a solids content of 31% by weight. The tricol is closed and the oxygen is removed by bubbling nitrogen for 30 minutes with stirring. The flask is then introduced into a thermostated oil bath at 80 ° C with 250 rpm stirring. The reaction is stopped after 5 hours.

A dispersion is obtained in the isododecane of block polymer poly (2-ethylhexyl acrylate-PEG co-acrylate) -b-methyl-polyacrylate-b-poly (2-ethylhexyl acrylate-PEG co-acrylate).

The final characteristics of the polymer and the dispersion are presented below: Mn Ls Ip rate *** *** PDI **** conversion (° / O) * ** (nm) 73 65840 1.8 38 0.03 Mn Ls: number average molecular weight, determined by GPC with light scattering detection ** Ip = Mw / Mn; Mw and Mn being the average weight and number molar masses determined by GPC with light scattering detection. *** ***: average diameter determined by dynamic light scattering (Malvern Zetasizer Nana S90): polydispersity index which reflects the polydispersity in particle size

The dispersion has a solids content of 25% by weight, is perfectly monodisperse and comprises 6.7% by weight of PEG acrylate, 24% by weight of 2-ethylhexyl acrylate and 69.3% by weight of methyl acrylate.

Example 3 Characterization of the Dispersions

The dispersions according to the invention prepared in Examples 1 and 2 are compared with a comparative dispersion prepared in a similar manner but not comprising PEG acrylate. EXAMPLE Dried extract of diameter% by weight% by weight% by weight dispersion of acrylate acrylate acrylate acrylate (PDI) 2-methyl methylhexyl 1 26% 36 nm 3.6 27.9 68 , 4 (0.03) 2 25% 38 nm 6.7 24.0 69.3 (0.03) compared with 28% 31 nm 0 36.6 63.4 tif (0.03) 10 From dispersion at 20% in isododecane, a film thickness of 100 μm (wet thickness, that is to say the dispersion as deposited) is made on a Leneta card.

Initially, the films obtained from the dispersions of the invention and compared are sticky and non-slippery. A drop of water is then spread on each film and left in contact for 24 hours. After wiping the drop of water, the surface in contact is evaluated.

For the films obtained with the dispersions according to the invention, the surface is slippery and non-sticky. For films obtained with comparative dispersion, the surface is tacky and non-slippery.

Example 4: Mascara Composition A mascara was prepared having the following composition: Waxes (bee, paraffin, carnauba) 17g Modified Hectorite (Bentone 38V) 5.3 g Propylene carbonate 1.7 g Pigments 5 g Polymer dispersion Example 1 20 g (ie 10 g MS *) Isododecane qs 100 g * MS: dry matter The mascara, after application to the eyelashes, is considered very satisfactory.

A mascara comprising the dispersion of Example 2 is similarly prepared.

Example 5 Lipstick Stick The following lipstick composition (% by weight) was prepared: Polyethylene wax 15% Polymer dispersion of Example 2 20% (ie 10% DM) Hydrogenated polyisobutene (Parléam of Nippon Oil Fats) 26 0/0 Pigments 8.6 0/0 Isododecane qs 100% The composition obtained after application to the lips has good cosmetic properties.

A lipstick stick comprising the dispersion of Example 1 is similarly prepared. EXAMPLE 6 Foundation A foundation is prepared comprising the following compounds: Phase A Cetyl Dimethicone Copolyol 3 g (ABIL EM 90) the company GOLDSCHMIDT) Isostearyl diglyceryl succinate 0.6 g (IMWITOR 780K from CONDEA) Isododecane 18.5 g Pigments 10 g Polymer dispersion of Example 1 16 g (ie 8 g MS) Polyamide powder (NYLON) -12) 8 g Phase B Water qs 100 g Magnesium sulphate 0.7 g Preservative qs Phase C Water 2 g Preservative qs The composition obtained has good cosmetic properties.

A foundation is also prepared in a similar manner comprising the dispersion of Example 2.

Example 7: Compact Powder A compacted powder having the following composition is prepared: Composition A: Talc 30 g Bismuth oxychloride 10 g Zinc stearate 4 g Nylon powder 20 g Dispersion of Example 1 5 g 2.5 g MS) Composition 8: - Iron oxides 2 g - Petrolatum oil 6 g The powder is obtained as follows: Composition A is ground in a KENWOOD mill for about 5 minutes with gentle stirring composition B is added and the whole is milled for about 2 minutes at the same speed and then 3 minutes at a faster rate. The preparation is then sieved through a 0.16 mm sieve and this mixture is compacted in cups. A compacted powder having good cosmetic properties is obtained.

A powder comprising the dispersion of Example 2 is similarly prepared.

EXAMPLE 8 Gel for the Face The following composition is prepared: Vaseline (wax) 5 g - modified hectorite (clay) 0.15 g - ozokerite (wax) 5 g - oxyethylenated sorbitan septaoleate (400E) 5 g - dispersion of Example 2 50 g (25 g MS) - isopropyl palmitate qs 100 g A gel having good cosmetic properties is obtained.

A facial gel comprising the dispersion of Example 1 is similarly prepared.

EXAMPLE 9 Care Oil The following composition is prepared: dispersion of Example 1 50 g (25 g MS) soybean oil 15 g jojoba oil qs 100 g A care oil is obtained which can be applied on the body or the face.

A care oil comprising the dispersion of Example 2 is similarly prepared.

Example 10 Lip Gloss A gloss having the following composition is prepared: polybutene 34% isononyl isonononate 4% octyldodecanol 10% silica (Aerosil R972) 5% dispersion of example 1 28% 14% MS) - tridecyl trimellitate qs 100%

A gloss comprising the dispersion of Example 2 is similarly prepared.

Claims (15)

REVENDICATIONS1. Dispersion, in a liquid carbon medium, of polymer particles sequen-ce, said block polymer comprising 0.5 to 50% by weight relative to the total weight of monomers, monomer of formula (I), alone or in mixture: Wherein R 1 is hydrogen or methyl; Z is a divalent group chosen from -COO-, -CONH-, -CONCH3-, -OCO-, -O-, -SO2- -CO-O-CO- or -CO-CH2-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 0, N, S, F, Si and P; - mest0ou1; n is an integer between 3 and 300 inclusive; R 3 is a hydrogen atom or a carbon radical, saturated or unsaturated, optionally aromatic, linear, branched or cyclic, of 1 to 30 carbon atoms, which can comprise 1 to 20 heteroatoms chosen from 0, N, S; , F, Si and P. 2. Dispersion according to claim 1, wherein in formula (I): - x = 1 and Z represents COO or CONH; and / or R2 represents an alkylene radical having 1 to 20 carbon atoms; a phenylene radical -C6H4- (ortho, meta or para) optionally substituted with a C1-C12 alkyl radical optionally comprising 1 to 18 heteroatoms selected from O, N, S, F, Si and P; or a benzylene radical -C6H4-CH2- optionally substituted by a C1-C12 alkyl radical optionally comprising 1 to 18 heteroatoms selected from O, N, S, F, Si and P; and / or - n is between 5 and 200 inclusive, and / or - 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, in particular 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. 3. Dispersion according to one of the preceding claims, wherein the monomers of formula (I) are such that: - x = 1 and Z represents COO, and - m = 0, and - n = 6 to 120 inclusive, and - R3 is selected 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. 4. Dispersion according to one of the preceding claims, wherein the monomer of formula (I) is selected from: - (meth) acrylate poly (ethylene glycol) wherein R1 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. 5. Dispersion according to one of the preceding claims, wherein the monomer of formula (I) or the mixture of such monomers, represents 1 to 30% by weight, or even 2 to 20% by weight, and more preferably 3 to 15% by weight, the total weight of monomers used to form the polymer. 6. Dispersion according to one of the preceding claims, wherein the block polymer comprises a first soluble sequence in the carbonaceous dispersion medium and at least a second sequence, insoluble in said medium. 7. Dispersion according to claim 6, in which the insoluble sequence represents 30 to 97% by weight of the total weight of the copolymer, in particular from 40 to 95% by weight, or even from 50 to 90% by weight, in particular 55 to 80% by weight. weight, and even more preferably from 60 to 75% by weight; and the soluble block represents 3 to 70% by weight of the total weight of the copolymer, in particular from 5 to 60% by weight, even from 10 to 50% by weight, in particular from 20 to 45% by weight, and even more preferably from 25 to 40% by weight. % in weight. 8. Dispersion according to one of the preceding claims, wherein the liquid carbon medium comprises at least 50% by weight, in particular from 50 to 100% by weight, for example from 60 to 99% by weight, or from 65 to 95% by weight. % by weight, seede 70 to 90% by weight, relative to the total weight of the carbon medium, of carbon compound, liquid at 25 ° C, having an overall solubility parameter according to the Hansen solubility space less than or equal to 20 (MPa) 112, or a mixture of such compounds. 9. Dispersion according to one of the preceding claims, wherein the carbon medium comprises at least one carbon compound selected from: - vegetable oils formed by esters of fatty acids and polyols, in particular triglycerides, - esters of RCOOR 'in which R represents the residue of a higher fatty acid having 7 to 19 carbon atoms and R' represents a hydrocarbon chain containing from 3 to 20 carbon atoms, - linear or branched C8-C60 alkanes, volatile. or non-volatile; cyclic, non-aromatic, C 5 -C 12 alkanes; volatile or non-volatile; Ethers having 7 to 30 carbon atoms; ketones having 8 to 30 carbon atoms; aliphatic fatty monoalcohols having 12 to 30 carbon atoms, the hydrocarbon chain having no substitution group, and mixtures thereof. 20 10. Cosmetic composition comprising, in a cosmetically acceptable medium, a dispersion as defined according to one of claims 1 to 9. 11. The composition according to claim 10, wherein the dispersion is present in an amount of 0.1 to 90% by weight, preferably 0.5 to 80% by weight, especially 1 to 75% by weight, or even 5-70% by weight, based on the total weight of the composition. 12. Composition according to one of claims 10 to 11, wherein the cosmetically acceptable medium comprises at least one ingredient selected from oils, preferably lipophilic solvents, solid fatty substances at room temperature, pasty fatty substances, erasers; some water; hydrophilic organic solvents; coloring matters; polymers; vitamins, thickeners, gelling agents, trace elements, softeners, sequestrants, perfumes, alkalizing or acidifying agents, preservatives, sunscreens, surfactants, antioxidants, anti-hair loss agents hair, anti-dandruff agents, propellants, ceramides. 13. Composition according to one of claims 10 to 12, in the form of a skin care and / or makeup composition; a suntan or self-tanning product, a hair product. 14. Composition according to one of claims 10 to 13, in the form of a makeup product, including a lipstick, a mascara, an eyeliner, a bottom of complexion, blush or eyeshadow. 15. Process for the cosmetic treatment of keratin materials comprising the application to said materials of a cosmetic composition as defined in one of claims 10 to 14.