WO2006000658A1 - Dispersion of ethylene polymer particles, composition containing same and method for treatment - Google Patents

Abstract

The invention relates to a dispersion, in a non-aqueous organic medium, of solid particles consisting of at least one ethylene polymer comprising a skeleton which is insoluble in said medium, and a part which is soluble in said medium, consisting of side chains which are covalently linked to said skeleton, wherein the ethylene polymer can be obtained by radical polymerization of at least one optical effect monomer in order to form the insoluble skeleton and at least one macromonomer comprising a polymerizable terminal group in order to form the side chains. The invention also relates to cosmetic or pharmaceutical compositions comprising said dispersion in a cosmetically or pharmaceutically acceptable medium. The invention further relates to a cosmetic treatment method for the care, cleaning and/or making up of keratin substances such as the skin of the face or body, the scalp, eyelashes, eyebrows, hair, lips and nails, comprising the application of said cosmetic composition to said keratin substances.

Description

 Dispersion of Ethylene Polymer Particles, Compound Composition and Treatment Process

The present invention relates to stable dispersions of particles formed by optical effect ethylenic polymers in a non-aqueous medium, as well as to the use of these dispersions in cosmetic compositions and compositions thus obtained.

It is known to use, in the field of cosmetics, dispersions of polymer particles in organic media, as film-forming agents in various cosmetic formulations, such as mascaras, eyeliners, eyelid shadows. res or nail polish. Thus, in the European patent application EP-A-0749747, there is described a composition comprising a dispersion of non-soluble polymer particles in a non-aqueous medium, said dispersion being stabilized by addition of stabilizing polymers. The stabilizing polymers according to this document bind non-covalently through physical interactions on the non-soluble polymers mentioned above. However, this type of composition has the following drawbacks: it requires the addition in the non-aqueous medium of a quantity of so-called stabilizing polymers greater than that effectively bound to the non-soluble polymer particles, in order to obtain a dispersion of said particles relatively stable. However, during the addition in these composi¬ tions of adjuvants, such as pigments, a portion of the stabilizing polymers tends to desorb insoluble polymer particles to associate with the said adjuvants, which which contributes to destabilizing the dispersion, in particular by formation of agglomerates between the polymer particles. JP 11181003 describes polymers capable of forming solid particles without the addition of stabilizing polymers, but these particles are unstable in non-aqueous organic media.

The Applicant has surprisingly discovered novel polymers capable of forming stable particles in a non-aqueous medium without the addition of stabilizing polymers.

Thus, the object of the present invention is to provide a dispersion, in an organic dispersion medium, of self-stabilized individual particles of polymer having optical effects, said dispersion being free of visibly insoluble particles and sediment agglomerates. for example after quenching the dispersion one day (24 hours) at ambient temperature (20 ^° C.).

Furthermore, there is also a need for organic polymers with optical properties to obtain optical effects adé¬ quats compositions comprising them and / or the makeup obtained with the aid of these compositions, said polymers having in addition a good thermal stability and photochemical, while having a low disgorgement.

A first object of the present invention is therefore a dispersion, in a non-aqueous organic medium, of particularly solid particles consisting of at least one ethylenic polymer comprising an insoluble backbone in said medium, and a portion soluble in said medium consisting of side chains. covalently bound to said backbone, said ethylenic polymer being capable of being obtained by radical polymerization of: at least one optical effect monomer of formula (I) as defined hereinafter, to form said insoluble backbone; and at least one macromonomer comprising a polymerizable end group capable of forming the side chains.

Another subject of the invention is a cosmetic or pharmaceutical composition comprising, in a cosmetically or pharmaceutically acceptable medium, such a dispersion.

Another subject of the invention is a cosmetic treatment method for the care, the cleaning and / or the makeup of keratin materials such as the skin of the body or face, the scalp, the eyelashes, the eyebrows, the hair, the lips, the nails, comprising the application on said keratin materials, of such a cosmetic composition.

The dispersions according to the invention are therefore free of stabilizing polymer, such as those described in EP749747, and the polymers according to the invention are therefore not surface stabilized by such additional stabilizing polymers.

An advantage of the invention is that the polymer dispersions according to the invention can provide lightening, illuminating, or color effects, in ma¬ quillage or composition. These optical effects can be advantageously modulated depending on the chemical nature and / or the position of the different substituents present on the optical effect monomer used to form the dispersed polymer. In general, when the group X is oxygen, the monomer, and the resulting polymer, will be rather blue / white; when the group X comprises a nitrogen atom, the monomer, and the resulting polymer will be rather in the field of yellow-orange. In addition, although of a similar chemical structure, the polymers according to the invention may have, depending on the nature of the substituents, a wide variety of optical effects, ranging from blue / violet to orange / red, passing by the yellow. This makes it possible to have a range of compounds, belonging to the same chemical family, and therefore formulating in a similar manner, which offer remarkable diversity of colors or optical properties; this facilitates in particular the work of the formulators by allowing them to keep an architec¬ ture common to all of their compositions, regardless of the polymers with optical property used. Furthermore, the polymers used according to the invention have good fluorescence properties, and for some of them, optical brightener properties. It is recalled that optical brighteners are endowed with fluorescence properties; in general, the fluorescent compounds absorb in the ultraviolet and the visible, and re-emit fluorescence energy for a wavelength between 380 nm and 830 nm; when this wavelength is between 380 nm and 480 nm, that is to say in the blue of the visible range, the compounds are then optical brighteners.

The dispersion according to the invention therefore comprises polymer particles, dispersed in an organic dispersion medium which is non-aqueous and which can be silicone or non-silicone.

The term "organic medium" means a non-aqueous organic medium consisting mainly of one or more organic or non-organic compounds, preferably organic, liquid as defined below, said medium may contain at most 1% by weight. weight of water. Preferably, the organic medium is liquid. Said organic medium may be silicone or non-silicone.

The term "non-silicone medium" or "non-silicone organic medium" means a medium comprising one or more non-silicone compounds, in particular organic compounds, as defined below, said non-silicone compounds being predominantly present, that is, that is to say at least 50% by weight, especially 50 to 100% by weight, for example 60 to 99% or 65 to 95% by weight, relative to the total weight of the medium, that is to say - say of the mixture 'possible silicone compounds + non-silicone organic compo¬ ss + possible water ¹ . Said non-silicone medium may therefore optionally comprise silicone compounds which may be present in a maximum amount of 50% by weight, in particular from 0 to 40% by weight, or even from 1 to 35% by weight, and even from 30% by weight relative to the total weight of the medium.

The term "silicone medium" or "silicone organic medium" means a medium consisting mainly of one or more silicone compounds as defined below, that is to say a medium in which said silicone compounds represent at least 50% by weight, in particular from 50 to 100% by weight, for example from 60 to 99% or from 65 to 95% by weight, of all the liquid constituents 'silicone compounds + possible non-silicone compounds + possible water' consti¬ killing said medium. Said medium may therefore optionally comprise non-silicone compounds which may be present in a maximum amount of 50% by weight, in particular from 0 to 40% by weight, or even from 1 to 35% by weight, and more preferably 5-30% by weight relative to the total weight of the medium.

Among the non-silicone compounds that may be present in said organic, silicone or non-silicone medium, mention may be made of: non-aqueous, non-silicone liquid compounds having an overall solubility parameter according to the Hansen solubility space less than or equal to (MPa) ^1/2 , preferably less than or equal to 18 (MPa) ^1/2 , even more preferably less than or equal to 17 (MPa) ¹ ' ² - monoalcohols having an overall solubility parameter according to the solubility space Hansen less than or equal to 20 (MPa) ^1/2 ; and - mixtures thereof.

The overall solubility parameter δ according to the Hansen solubility space is dé¬ finished in the article "Solubility parameter values" by Eric A.Grulke of the book "Polymer Handbook", ^3rd edition, Chapter VII, p. 519-559 by the relation:

in which - do characterizes the LONDON dispersion forces resulting from the formation of dipoles induced during molecular shocks, - dp characterizes the DEBYE interaction forces between permanent dipoles, and - d _H characterizes the specific interaction forces (type hydrogen, acid / base bonds, donor / acceptor, etc.). The definition of solvents in the Hansen solubility space is described in the CM article. Hansen "The three dimensional solubility parameters" J.Paint Technol. 39, 105 (1967).

Among the non-aqueous, non-silicone liquid compounds having an overall solubility parameter according to the Hansen solubility space less than or equal to 20 (MPa) ¹⁷² , mention may be made of liquid fatty substances, in particular volatile or nonvolatile oils, which may be chosen from natural or synthetic oils, carbo¬ ned, hydrocarbon, fluorinated, silicone, optionally branched, alone or in mixture.

By "oil" is meant any nonaqueous liquid medium at room temperature (25 ° C) and atmospheric pressure (760 mm Hg), compatible with an applica¬ tion on the skin, mucous membranes (lips) and / or dander (nails, eyelashes, eyebrows, hair).

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). Nonvolatile oils that can be used in the invention include non-volatile, non-silicone oils, especially hydrocarbon oils, such as liquid paraffin (or petroleum jelly), squalane, hydrogenated polyisobutylene (Parleam® oil), perhydrosqualene, mint oil, turtle oil, soy oil, sweet almond oil, calophyllum oil, palm oil, grape seed oil, sesame oil, maize oil, arara oil, colza oil, sunflower oil, cotton, apricot, castor oil, avocado, jojoba, olive or cereal sprouts; esters of lanolic acid, oleic acid, lauric acid, stearic acid; esters derived from long chain (ie having from 6 to 20 carbon atoms) acids or alcohols, especially esters of the formula RCOOR 'in which R represents the residue of an acid higher fatty acid containing 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-ethyl hexyl palmate, 2-hexyl decyl laurate, palmitate 2- octyl decyl, myristate or 2-octyl-dodecyl lactate, di (2-ethyl hexyl) succinate, diisostearyl malate, glycerin or diglycerin triisostearate; higher fatty acids, especially C14-C22, 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.

As the volatile oil that may be used according to the invention, it is possible to use non-silicone volatile oils, in particular C ₈ -C ₁₈ isoparaffins such as isododecane, isodecane and isohexadecane, and for example the oils sold under the trade names of ISOPAR, PERMETHYL and in particular isododecane (PERMETHYL 99 A).

Among the non-aqueous, non-silicone liquid compounds having an overall solubility parameter according to the Hansen solubility space less than or equal to 20 (MPa) ¹ ' ² , mention may also be made of: linear, branched or cyclic esters having more of 6 carbon atoms, especially 6 to 30 carbon atoms, - ethers having more than 6 carbon atoms, especially 6 to 30 carbon atoms; and ketones having more than 6 carbon atoms, especially 6 to 30 carbon atoms. linear, branched and / or cyclic alkanes which may be volatile, and in particular paraffin oils, petroleum jelly or hydrogenated polyisobutylene.

By monoalcohols having an overall solubility parameter according to the Hansen solubility space less than or equal to 20 (MPa) ¹⁷² , we mean the fatty monoalcohols aliphatic having 6 to 30 carbon atoms, the hydrocarbon chain com¬ bearing no substitution group. As monoalcohols according to the invention, mention may be made of oleic alcohol, decanol, dodecanol, octadecanol and linoleic alcohol.

Among the silicone compounds that may be present in said organic, silicone or non-silicone medium, mention may be made of non-aqueous silicone liquid compounds having an overall solubility parameter according to the Hansen solubility space of less than or equal to 20 ( MPa) ¹⁷² , preferably less than or equal to 17 (MPa) ¹⁷² .

In particular, mention may be made of silicone oils, which are optionally branched, volatile and / or nonvolatile.

Among the nonvolatile silicone oils, mention may be made of non-volatile polydialkylsiloxanes, such as non-volatile polydimethylsiloxanes (PDMS); polydimethylsiloxanes comprising alkyl, alkoxy or phenyl groups, during or at the end of the silicone chain, groups having from 2 to 24 carbon atoms; phenyl silicones such as phenyl trimethicones, phenyl dimethicones, phenyl trimethylsiloxy diphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes, polymethylphenylsiloxanes; polysiloxanes modified with fatty acids (in particular C 8 -C 20), with fatty alcohols (in particular C 8 -C 20) and / or with polyoxyalkylenes (especially polyoxyethylene and / or polyoxypropylene); aminated polysiloxanes; hydroxyl group-containing polysiloxanes; the fluorinated polysiloxanes comprising a fluorinated group pen¬ dant or at the end of silicone chain having 1 to 12 carbon atoms, all or part of the hydrogen atoms are substituted by fluorine atoms; and their mixtures.

As the volatile silicone oil that can be used in the invention, mention may be made of linear or cyclic silicone containing 2 to 7 silicon atoms, these silicones optionally comprising alkyl or alkoxy groups having from 1 to 10 carbon atoms. In particular, there may be mentioned octamethylcyclotetrasiloxane, decamethylcyclopentoxiloxane, dodecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane and mixtures thereof.

The choice of the monomers constituting the backbone of the polymer, the choice of the monomer, the molecular weight of the polymer, the macromonomer and the proportion of said macromonomers and monomers will depend on the organic polymerization medium and / or the organic medium of the polymer. dispersion, so as finally to obtain a dispersion of solid particles of polymers sta¬ ble in said medium, this choice can be made by the skilled person. By "stable dispersion" is meant, according to the invention, a dispersion which is not likely to form solid deposition or liquid / solid phase shift especially after centrifugation, for example, at 4000 revolutions / minute for 15 minutes.

The ethylenic polymers forming the particles dispersed in the organic dispersion medium therefore comprise an insoluble backbone in said half and a portion soluble in said medium. These polymers may be in various forms, in particular in the form of random polymers.

According to the invention, the term "ethylenic polymer" is understood to mean a polymer that can be obtained by radical polymerization, in an organic polymerization medium, of: at least one monomer with an optical effect as defined below, optionally in admixture with at least one additional ethylenic monomer, preferably at least one (meth) acrylic monomer, to form said insoluble backbone; and - at least one macromonomer having a polymerizable terminal group to form the side chains.

The optically or optically active monomer has formula (I):

in which :

- R1 represents a linear, branched and / or cyclic carbon radical, saturated and / or unsaturated, comprising 1 to 32 carbon atoms; optionally substituted with one or more groups selected from = 0, OH, NH ₂ , and halogen atoms; and / or optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S;

R2 and R3, present on the same ring or each on a different ring, represent, independently of one another, a hydrogen, a halogen, or a group of formula -XGP (II), under the proviso that at least one of R 2 and / or R 3 is a group of formula (II), wherein: X is selected from -O-, -S-, -SO-, -SO ₂ - , -NH- or -NR4- with R4 representing a linear, branched and / or cyclic carbon radical, saturated and / or unsaturated ture, comprising 1 to 30 carbon atoms, optionally substituted with one or more groups selected from = 0, OH, NH ₂ , and halogen atoms; and / or optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S; G is a linear, branched and / or cyclic, saturated and / or unsaturated divalent carbon radical comprising 1 to 32 carbon atoms, optionally substituted with one or more groups chosen from = O, OH, NH ₂ , and the atoms of halogen; and / or optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S; P is a polymerizable group chosen from one of the following formulas:

C'a) (MIb) (MIc) in which:

R 'represents H or a hydrocarbon radical, linear or branched, saturated with C1-6,

- X ^* is O, NH or NR "with R" representing a radical chosen from ra¬ dicaux alkyl C1-6, aryl C6-10, aryl (C6-10) alkyl (C1-6) or alkyl (C1 - 6) aryls (C6-10), the alkyl and / or aryl groups may be further substi¬ killed by one or more groups selected from OH, halogen, C1-C6 alkoxy and C6-10 aryloxy; and - m is 0 or 1; n is 0 or 1 and p is 0, 1 or 2.

In the present invention, the term "cyclic radical ¹ " is understood to mean a monocyclic or polycyclic radical, which is therefore itself in the form of one or more saturated and / or unsaturated, optionally substituted rings (for example cyclohexyl). cyclodecyl, benzyl or fluorenyl), but also a radical which com¬ takes one or more of said rings (for example p-tertbutylcyclohexyl or 4-hydroxybenzyl). In the present invention, the term "saturated and / or unsaturated radical" means fully saturated radii, completely unsaturated radicals, including aromatic radicals, as well as radicals comprising one or more double and / or triple bonds, the rest of the links being single links.

Preferably, R 1 may especially be a linear and / or branched, saturated or unsaturated cyclic hydrocarbon radical, optionally comprising a hydrocarbon ring which is itself saturated or unsaturated, comprising 3 to 18, in particular 4 to 14, atoms carbon, and may comprise at least one heteroatom, in particular one or two nitrogen, oxygen or silicon atoms. Preferably, R 1 may be a linear hydrocarbon radical, branched and / or cyclic, saturated or unsaturated, comprising 6 to 13 carbon atoms. In particular, R 1 can be n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, cyclopentyl, n-hexyl, cyclohexyl, n-heptyl, n-octyl, cyclooctyl, decyl, cyclodecyl radical. , dodecyl, cyclododecyl, p-tertbutylcyclohexyl, benzyl, phenyl, or a radical chosen from ethyl-2-N-pyrrolidine, (2-methyl) -1-ethylpyrrolidine, 3-propyltriethoxysilane, dialkylpyrimidines and in particular 2 - (4,6-dimethyl) -pyrimidine, the benzothiazyl radical, the fluorenyl radical.

The radical R 2 is preferably a hydrogen atom, and therefore R 3 is a group of formula (II).

In said group of formula (II), X is preferably selected from -O-, -S-, -NH- or -NR4-. The R 4 radical preferably represents a saturated or unsaturated, linear and / or cyclic hydrocarbon radical, comprising 1 to 18, especially 2 to 12 carbon atoms, said radical optionally comprising a hydrocarbon ring which is itself saturated or unsaturated. and / or said radical being optionally substi¬ killed by one or more groups selected from = 0, OH, NH ₂ , and the halogen atoms, and / or said radical being optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S. Notably R4 may be a methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, pentyl, hexyl, cyclohexyl, octyl, decyl, dodecyl, phenyl or benzyl.

The divalent radical G is preferably a linear, branched and / or cyclic, saturated or unsaturated divalent hydrocarbon radical, optionally comprising a hydrocarbon ring which is itself saturated or unsaturated, comprising in total 2 to 18, in particular 3 to 10 carbon atoms. carbon, optionally substituted with one or more groups selected from = O, OH ₁ NH ₂ , and halogen atoms; and / or possibly interrupted by one or more heteroatoms chosen from O, N, P, Si. Preferably G is chosen from linear or branched, saturated divalent hydrocarbon radicals optionally comprising a saturated hydrocarbon ring, comprising in total 2 to 18, especially 3 to 10 carbon atoms. Thus G may be chosen from ethylene, n-propylene, isopropylene (or methyl-1-ethylene and 2-methylethylene), n-butylene, isobutylene, pentylene, especially n-pentylene, hexylene, especially n-hexylene, heptylene, cyclohexylene, octylene, decylene, cyclohexyldimethylene in particular of formula -CH ₂ -C ₆ H ₁₀ -CH ₂ -, dodecylene.

In the formula (HIb), if n = 0 then preferably, m = 0. The polymerizable group P is preferably chosen from one of the following formulas:

in which R 'is H or methyl. Among the monomeric compounds that are particularly preferred according to the invention, there may be mentioned compounds corresponding to one of the following formulas:

O

Some of these compounds may in particular be prepared according to the state of the art, for example according to the teaching of document EP728745, in particular to bind the compounds for which X is N.

In a schematic way, the general method of synthesis, for the compounds for which X is O, can be represented as follows:

The appropriate naphthalic anhydride can thus be reacted with a suitable primary amine R 1 -NH 2. Then the imide formed can be reacted with a diol, aminoalcohol or thioalcohol. For example, when R'2 is a halogen (preferably chlorine or bromine), it is possible to perform an aromatic nucleophilic substitution, for example using a diol such as 1,3-propanediol or 1,5 propane-diol, optionally in the form of an alkali metal alcoholate (sodium, for example). The corresponding alcohol derivative is then obtained, which can then be reacted with a (meth) acryloyl halide, in particular a chloride, so as to form the corresponding (meth) acrylate.

The monomeric compounds for which X is S can be prepared in a similar manner. In particular, the reaction formed in the first step above can be reacted with an alkali metal alcoholate of thioalcohol so as to form the alcoholic derivative according to the scheme below:

This derivative can then be oxidized under mild conditions so as to lead to the corresponding sulfoxide. By modifying the conditions of the oxidation, it is also possible to prepare the corresponding sulfone. These sulfides, sulfoxides and sulfones can then be converted to obtain the desired methacrylates or acrylates.

It is of course possible to use a monomer mixture of formula (I) to form the dispersion polymer according to the invention.

Preferably, the monomer with an optical effect, alone or as a mixture, is present at from 0.005 to 40% by weight, especially 0.01 to 20% by weight, or even 0.1 to 10% by weight, and still more preferably 0.5 to 5% by weight, relative to the weight of the ethylene polymer. final.

The ethylene polymer in dispersion according to the invention may also comprise, optionally but preferably, at least one additional ethylenic monomer, which is preferably chosen from monomers whose homopolymer is insoluble in the organic dispersion medium. considered, that is to say that the homopolymer is in solid form (or undissolved) at a concentration greater than or equal to 5% by weight at room temperature (20 ^° C.) in said organic dispersion medium.

It is of course possible to use a mixture of different ethylenic monomers, and in particular a mixture of different (meth) acrylic monomers.

Preferably, the additional ethylenic monomer, alone or as a mixture, is present in a proportion of 40 to 99.495% by weight, in particular 50-98% by weight, or even 60 to 95% by weight, preferably 75 to 92% by weight. or 80 to 90% by weight, based on the weight of the final ethylenic polymer.

In a preferred embodiment, the additional ethylenic monomer or monomers comprises at least one (meth) acrylic monomer as defined below. Preferably, the monomer (meth) acrylic, alone or as a mixture, represents 60 to 100% by weight, in particular 75 to 99.5% by weight, or even 85 to 99% by weight, of the total weight of additional ethylenic monomers. any optional 100% supplement consisting of non-(meth) acrylic ethylenic monomers, alone or as a mixture.

As monomer (meth) acrylic may be used to form, with the monomer or monomers of formula (I), after polymerization the insoluble skeleton of the polymer, may be mentioned, alone or in mixture, the following monomers, as well as their salts:

(i) (meth) acrylates of formula CH ₂ = CHCOOR ' ₃ or CH ₂ = C (CH ₃ ) COOR' ₃ in which R ' ₃ represents: a linear or branched alkyl group comprising 1 to 18 atoms of carbon, in which is (are) optionally intercalated (s) one or more heteroatoms selected from O, N, S and P and / or said alkyl group may be optionally substituted with one or more substituents selected from -OH, the atoms of halogen (Cl, Br, I and F), wherein R ₄ and R _{5, which are} identical or different, represent hydrogen or a linear or branched C 1 -C 6 alkyl group or a phenyl group; and / or the polyoxyalkylene groups, especially polyoxyethylene and / or polyoxypropylene, said polyoxyalkylene group consisting of by repeating 5 to 30 oxyalkylene units; a C ₃ to C ₁₂ cycloalkyl group, said cycloalkyl group being able to comprise in its chain one or more heteroatoms chosen from O, N, S and / or P, and / or possibly being substituted by one or more substituents; killers selected from -OH and halogen atoms (Cl, Br, I and F); - aryl C3-C20 aralkyl or C ₄ -C ₃₀ (group allocation Kyle Ci-Ce); in particular R'3 may be methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, hexyl, ethylhexyl, octyl, lauryl, isooctyl, isodecyl, decyl, cyclohexyl, t-butylcyclohexyl, stearyl, ethyl- 2-perfluorohexyl, 2-hydroxyethyl, 2-hydroxybutyl, 2-hydroxypropyl, methoxyethyl, ethoxyethyl, methoxypropyl, isobornyl, phenyl, 2-phenylethyl, t-butylbenzyl, benzyl, furfurylmethyl or tetrahydrofurfurylmethyl, methoxy-polyoxyethylene (or POE-methyl) ); POE-behenyl, trifluoroethyl; dimethylaminoethyl, diethylaminoethyl, dimethylaminopropyl.

(ii) (meth) acrylamides of formula CH ₂ = CHCONRVR'5 or CH ₂ = C (CH ₃ ) CONR ¹ 4R ¹ 5 in which R ' ₄ and R', which are identical or different, represent a hydrogen atom or a) a linear or branched alkyl group comprising from 1 to 18 carbon atoms in which one or more heteroatoms selected from O, N, S and P are optionally intercalated; said alkyl group may also be optionally substituted by one or more substituents selected from hydroxyl groups, halogen atoms (Cl, Br, I and F), and Si (R ₄ R ₅ ) groups, wherein R ₄ and R _{5, which are the} same or different, represent a C1-C4 alkyl group or a phenyl group; and especially a methyl, ethyl, propyl, n-butyl, isobutyl, tert-butyl, hexyl, ethylhexyl, octyl, lauryl, isooctyl, isodecyl, dodecyl, cyclohexyl, t-butylcyclohexyl or stearyl group; ethyl-2-perfluorohexyl; or a hydroxy-C-ι- ₄ such as 2-hydroxyethyl, 2-hydroxybutyl and 2-hydroxypropyl; or alkoxy (Ci _-4) alkyl (Ci _-4) such as methoxyethyl, ethoxyethyl and méthoxy¬ propyl, b) a cycloalkyl group, C ₃ to C 12, such as an isobornyl group, or a heterocycloalkyl group (alkyl of 1 to 4 carbon atoms), such as furfurylmethyl or tetrahydrofurfurylmethyl, c) a C ₃ to C ₂ aryl group such as phenyl, d) a C ₄ to C ₃ aralkyl group (C ₁ to C ₆ alkyl group) ) such as 2-phenylethyl, t-butylbenzyl or benzyl,

(iii) (meth) acrylic monomers containing ethylenic unsaturation (s) comprising at least one carboxylic, phosphoric or sulphonic acid function, such as acrylic acid, methacrylic acid, acrylamidopropanesulphonic acid, and their salts;

Among these (meth) acrylic monomers, mention may be made especially of methyl, ethyl, n-propyl, isopropyl, butyl and isobutyl (meth) acrylates; methoxyethyl or ethoxyethyl (meth) acrylates; trifluoroethyl (meth) acrylate; dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, acrylic acid, methacrylic acid, (meth) acrylamide, N-ethyl (meth) acrylamide, N-butyl (meth) acrylamide, Nt-butyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dibutyl (meth) acrylamide, N-octyl (meth) acrylamide, N-dodecyl (meth) acrylamide, rundecyl (meth) acrylamide, N (2-hydroxypropyl) (meth) acrylamide, dimethylaminopropyl (meth) ) acrylamide) and their salts; and their mixtures

Preferably, the (meth) acrylic monomers are selected from methyl acrylate, methyl methacrylate, acrylic acid and methacrylic acid, and mixtures thereof.

Among the additional non (meth) acrylic ethylenic monomers, mention may be made of: vinyl esters of formula: R ₆ -COO-CH =CH ₂ in which R _& represents a linear or branched alkyl group comprising from 1 to 6 atoms or a cyclic alkyl group having 3 to 6 carbon atoms and / or an aromatic group, for example of the benzene, anthracene, and naphthalenic type; ethylenic hydrocarbons having 2 to 10 carbons, such as ethylene, isoprene or butadiene; monomers containing ethylenic unsaturation (s) comprising at least one carboxylic acid, phosphoric or sulphonic acid function, or anhydride, such as, for example, crotonic acid, maleic anhydride, itaconic acid, and acid; fumaric acid, maleic acid, styrenesulfonic acid, vinylbenzoic acid, vinylphosphoric acid and salts thereof; ethylenically unsaturated monomers comprising at least one tertiary amine function such as 2-vinylpyridine or 4-vinylpyridine; the vinyl compounds of formulas: CH ₂ = CH-R ₉ , CH ₂ = CH-CH ₂ -R ₉ or CH ₂ = C (CHa) -CH ₂ -R ₉ in which R ₉ is a hydroxyl, halogen ( Cl or F), NH _2, oR-io where Rio represents a phenyl group or an alkyl group Ci-Ci ₂ (the monomer is a vinyl or allylic ether); acetamide (NHCOCH ₃ ); an OCORn group where Rn represents a linear or branched alkyl group of 2 to 12 carbons (the monomer is a vinyl or allyl ester); or a group selected from: a linear or branched alkyl group, from 1 to 18 carbon atoms; bone, in which one or more heteroatoms selected from O, N, S and P are optionally intercalated; said alkyl group may, in addition, be optionally substituted with one or more substituents chosen from hydroxyl groups, halogen atoms (Cl, Br, I and F), and Si (R ₄ R ₅ ) groups, where R ₄ and R _{5, which are} identical or different, represent a C 1 -C 6 alkyl group or a phenyl group; - cycloalkyl, C ₃ to C ₂ as isobornyl, cyclohexane, - an aryl group of C ₃ -C ₂ o such as phenyl, - aralkyl, C ₄ to C 30 (alkyl group -C ₈ ) such as 2-phenylethyl; benzyl, - a 4- to 12-membered heterocyclic group containing one or more heteroatoms selected from O, N, and S, the ring being aromatic or not, - a heterocycloalkyl (alkyl of 1 to 4 C) group, such as furfurylmethyl or tetrahydrofurfurylmethyl, as well as their salts and mixtures thereof.

Among the additional ethylenic monomers, mention may in particular be made of vinylcyclohexane, styrene, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl ethylhexanoate, vinyl neononanoate and neododecanate. of vinyl, vinyl methyl ether, vinyl ethyl ether and vinyl isobutyl ether.

Among the salts, mention may be made of those obtained by neutralization of acid groups using inorganic bases such as LiOH, NaOH, KOH, Ca (OH) ₂ , NH ₄ OH or Zn (OH) ₂ ; or with an organic base such as a primary, secondary or tertiary alkylamine, especially triethylamine or butylamine. This primary, secondary or tertiary alkyl amine may comprise one or more nitrogen and / or oxygen atoms and may therefore comprise, for example, one or more alcohol functions; mention may especially be made of 2-amino-methyl-2-propanol, triethanolamine and dimethylamino-2-propanol. We can also mention lysine or 3- (dimethylamino) -propylamine. It is also possible to mention the salts of mineral acids, such as sulfuric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, phosphoric acid and boric acid. Mention may also be made of organic acid salts, which may comprise one or more carboxylic acid, sulphonic acid or phosphonic acid groups. It may be linear, branched or cyclic aliphatic acids or aromatic acids. These acids may comprise, in addition, one or more heteroatoms selected from O and N, for example in the form of hydroxyl groups. These include propionic acid, acetic acid, terephthalic acid, citric acid and tartaric acid.

It is understood that the additional ethylenic monomers and / or unpolymerized optical effect monomers may be soluble in the dispersion medium and / or of polymerization considered; however, the ethylenic polymer formed by polymerization of these monomers is insoluble in said dispersion medium and is in the form of a dispersion of solid particles of said polymer in said medium.

According to one embodiment of the invention, the ethylenic polymer does not comprise additional ethylenic (meth) acrylic monomers as previously described. In this embodiment, the insoluble backbone of the ethylenic polymer is formed solely of monomers of formula (I) and optionally of additional (meth) acrylic monomers as described above.

According to the invention, the term "macromonomer" or "macromonomer having a polymerizable end group" any polymer, in particular oligomeric, having on one of its ends a terminal group, in particular a polymerizable group, capable of reacting during the polymerization reaction with the monomers considered, to form the side chains of the ethylenic polymer; said tertiary group may advantageously be an ethylenically unsaturated group capable of polymerizing by a radical route with the monomers constituting the backbone.

Preferably, the macromonomer is chosen from macromonomers whose homopolymer is soluble in the organic dispersion medium in question, that is to say completely dissolved at a concentration greater than or equal to 5% by weight and at room temperature (25%). ⁰ C) in said organic medium.

Thus, in the end, the ethylenic polymers according to the invention are in the form of insoluble polymers in the dispersion medium under consideration, and com¬ take a skeleton (or main chain) consisting of a sequence of particularly acrylic units resulting from the polymerization in particular one or more (meth) acrylic and / or ethylenic monomers and one or more monomers with optical effect / property, and side chains (or grafts) resulting from the reaction of the macromonomers, said side chains being linked in a manner covalently to said main chain. The backbone (or main chain) is insoluble in the dispersion medium considered while the side chains (or grafts) are soluble in said medium.

The macromonomers constituting after reaction the side chains of the polymer according to the invention comprise at the end of the chain a terminal group capable of reacting during the polymerization with the monomers with optical properties, and / or acrylic and / or vinyl, for forming said chains, said termi¬ nal polymerizable group being in particular a vinyl group, preferably an acrylate or methacrylate group (also known as (meth) acryloyloxy). The macromonomers are preferably chosen from macromonomers whose homopolymers have a glass transition temperature (Tg) of less than or equal to 25 ° C., in particular ranging from -100 ^° C. to 25 ° C., preferably from -80 ^° C. to 0 ^° C. ° C included. Preferably, the macromonomers according to the invention have a weight average molecular mass (Mw) ranging from 200 to 100,000, preferably from 300 to 50,000, in particular from 500 to 20,000, preferably from 800 to 10,000, or even from 1000 to 6000.

As macromonomers, it is possible to use either non-silicone, especially carbon-based macromonomers, or silicone macromonomers. The term "carbon-based macromonomer" is understood to mean in particular an oli¬-gomeric macromonomer obtained by polymerization of ethylenically unsaturated monomer (s), and mainly by polymerization of acrylic and / or non-acrylic vinyl monomers. By "silicone macromonomer" is meant an organopolysiloxane macromonomer, and in particular a polydimethylsiloxane macromonomer.

Mention may in particular be made of: (i) homopolymers and copolymers of C6-C22, preferably C8-C18, linear or branched alkyl (meth) acrylate having a polymerizable terminal group selected from vinyl groups or (meth) acrylate; and especially macromonomers of poly (2-ethylhexyl acrylate) end-monoacrylate or monomethacrylate; macromonomers of poly (dodecyl acrylate) or of poly (dodecyl methacrylate) with a monoacrylate or monomethacrylate end; macromonomers of poly (stearyl acrylate) or poly (stearyl methacrylate) with monoacrylate or monomethacrylate end. Such macromonomers are in particular described in patents EP895467 and EP96459 and in the article Gillman KF, Polymer Letters, Vol 5, page 477-481 (1967). (ii) polyolefins having an ethylenically unsaturated end group of vinyl type or preferably having a (meth) acrylate end group. In particular, mention may be made of the following macromonomers, it being understood that they have a terminal (meth) acrylate group: polyethylene macromonomers, polypropylene mapromonomers, polyethylene / polypropylene copolymer macromonomers, polyethylene copolymer macromonomers lene / polybutylene, polyisobutylene macromonomers; macromonomers of polybutadiene; polyisoprene macromonomers; poly (ethylene / butylene) -polyisoprene macromonomers; Such macromonomers are in particular described in EP1347013 or in US5625005 which mentions ethylene / butylene and ethylene / propylene macromonomers with a (meth) acrylate reactive end group. In particular, these macromonomers can be represented by the following formula:

R1 R3

Embedded image in which R 1, R 2 and R 3, independently of one another, represent hydrogen or a linear, cyclic or branched alkyl group having from 1 to 16 carbon atoms; , especially 1 to 6; preferably hydrogen; and X represents a chain of polyethylene and / or polypropylene and / or polybutylene. In particular, mention may be made of poly (ethylene / butylene) methacrylate, as it is marketed under the name Kraton Liquid L-1253 by Kraton PoIymers.

Among the silicone macromonomers, mention may in particular be made of polydimethylsiloxanes with a mono (meth) acrylate end group, and in particular those of the following formula (Ma):

in which: - Rs denotes a hydrogen atom or a methyl group; preferably methyl; - R ₉ denotes a divalent hydrocarbon group, linear or branched, preferably linear, having 1 to 10 carbon atoms and optionally containing one or two -O- ether linkages; preferably ethylene, propylene or butylene; Rio 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.

Silicone macromonomers which may be mentioned in particular are monomethacryloyloxypropyl polydimethylsiloxanes, such as those sold under the name PS560-K6 by UCT (United Chemical Technologies Inc.) or under the name MCR-M17 by Gelest Inc. The macromonomers are preferably present in the ethylenic polymers of the invention, alone or as a mixture, in a proportion of 0.5 to 20% by weight, in particular from 1 to 18% by weight, preferably from 2 to 16% by weight. by weight, and especially from 4 to 15% by weight, among others from 6 to 13% by weight, or even 8 to 12% by weight, relative to the total weight of said polymer.

According to a first embodiment of the invention, the organic dis¬ persion medium may be a non-silicone medium; in this case, the macromonomers present in the ethylenic polymer are advantageously carbonaceous macromonomers; preferably, the ethylenic polymer is advantageously a non-silicone polymer.

According to a second embodiment of the invention, the organic dis¬ persion medium may be a silicone medium; in this case, the macromonomers present in the ethylenic polymer are advantageously silico-born macromonomers; preferably, the ethylenic polymer is advantageously a silicone polymer.

Particularly advantageous polymers according to the invention are those obtained by polymerization, with a monomer of formula (I): - methyl acrylate and a polyethylene / polybutylene macromonomer methacrylate ter¬ minaison in a solvent such as isododecane isononylisononanoate, octyldodecanol, diisostearyl malate or a C ₁ -C ₅ alkylbenzoate (such as Finsolv TN); a mixture of methyl acrylate / methyl methacrylate monomers and a methacrylate-terminated polyethylene / polybutylene macromonomer, in particular in isododecane; a mixture of methyl acrylate / acrylic acid monomers and a methacrylate-terminated polyethylene / polybutylene monomer in a solvent such as isododecane; methyl acrylate and a monomethacryloyloxypropylpoly-dimethylsiloxane macromonomer, in particular in decamethylcyclopentasiloxane or phenyltrimethicone; of methyl acrylate, of acrylic acid and of a monomethacryloyloxypropylpolydimethylsiloxane macromonomer, in particular in decamethylcyclopentaziloxane or phenyltrimethicone.

Preferably, the ethylenic polymer has a weight average molecular weight (Mw) of between 10,000 and 500,000, especially between 20,000 and 300,000, more preferably between 25,000 and 200,000, or even between 30,000 and 150,000.

Preferably, the ethylenic polymer according to the invention is a film-forming polymer uncomfortable. By "film-forming" polymer is meant 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.

The polymer according to the invention is in particular a non-crosslinked polymer. In particular, the polymer is obtained by polymerization of monomers comprising a single polymerizable group.

Thanks to the above-mentioned characteristics, in a given organic medium, the polymers have the capacity to fold on themselves, thus forming particles of substantially spherical shape, with on the periphery of these particu¬ the extended side chains, which ensure the stability of these particles. Such particles resulting from the characteristics of the polymers of the invention have the particular feature of not agglomerate in said medium and thus to self-stabilize and form a dispersion of particularly stable polymer particles. In particular, the polymers of the invention are capable of forming nanoscale soli¬ particles of average size ranging from 10 to 400 nm, preferably from 20 to 200 nm. Due to this very small size, the particles entering the constitu¬ tion of the dispersion are particularly stable and therefore unlikely to form agglomerates. The dispersion of the invention is therefore a stable dispersion in the medium in question and does not form sediment, when it is placed for a prolonged period (for example 24 hours) at room temperature (25 ° C.).

Preferably, the dispersion of particles has a solids content (or dry extract) polymer of 20% to 70% by weight of dry matter, especially 30 to 65% by weight, or even 40 to 60% by weight.

The said dispersion of polymer particles may be prepared by a process comprising a step of carrying out a radical copolymerization, in an organic medium known as "polymerization" as defined above, of one or more monomers as defined previously with a or more ma¬ cromonomers as defined above. In a conventional manner, the copolymerization can be carried out in the presence of a polymerization initiator. The polymerization initiators may be free radical initiators. In general, such a polymerization initiator may be chosen from organic peroxide compounds such as dilauryl peroxide, dibenzoyl peroxide and tert-butyl peroxy-2-ethylhexanoate; diazotized compounds such as azobisisobutyronitrile, azobisdimethylvaleronitrile. The reaction can also be initiated using photoinitiators or by radiation such as UV, neutron or plasma.

In general, to implement this process, one introduces, in a reactor of appropriate size for the amount of polymer that will be produced, at least a portion of the organic polymerization medium, which is preferably a solvent medium of the monomer of formula (I), all or part of the monomers of for¬ mule (I) and at least a part of the optional additional monomers, which will constitute, after polymerization, the insoluble backbone, the entire macromonomer (which will constitute the side chains of the polymer) and a part of the polymerization initiator. At this stage of introduction, the reaction medium forms a relatively homogeneous medium. The reaction medium is then stirred and heated to a given temperature, so as to obtain a polymerization of the monomers and macromonomers. After a certain time, the initially homogeneous and clear medium generally leads to a dispersion of milky or colored appearance. A mixture consisting of the remaining part of the monomers and the polymerization initiator is then added. After a suitable time during which the mixture is generally heated with stirring, the medium stabilizes in the form of a milky or colored dispersion, the dispersion comprising stabilized polymer particles in the medium in which they were created, said stabilization being due the presence in the polymer of side chains soluble in said medium.

It is also possible to prepare the dispersion of solid particles of polymer in an organic polymerization medium which can subsequently be replaced by an organic dispersion medium in the sense of the invention. Thus, the organic dispersion medium, corresponding to the medium in which the ethylenic polymer is supplied, may be identical to or different from the polymerization medium. In the latter case, the polymerization medium may be substituted in whole or in part by another organic medium, the dispersion medium, which may be added, after polymerization, to the polymerization medium. The latter is then evaporated in whole or in part.

The dispersion of solid particles of polymers according to the invention can be used in any type of composition and in particular in a cosmetic or pharmaceutical composition comprising a cosmetically or pharmaceutically acceptable medium, that is to say a medium compatible with keratin materials such as the skin of the face or body, hair, eyelashes, eyebrows and nails.

The dispersion may be present in a proportion of 3 to 95% by weight in the composition, in particular 4-90% by weight, or even 5-70% by weight, preferably 10 to 50% by weight.

The composition may thus comprise a hydrophilic medium 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 at 5 carbon atoms such as ethanol, isopropanol or n-propanol, and polyols such as glycerin, diglycerine, propylene glycol, sorbitol, pentylene glycol, and polyethylene glycols, or even C-ethers. ₂ and hydrophilic C ₂ -C ₄ 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 99% by weight, relative to the total weight of the composition, and preferably from 10% to 80% by weight. The composition may also be anhydrous.

The composition may also comprise a fatty phase which may comprise fatty substances that are liquid at room temperature (generally 25 ° C.) and / or fatty substances that are solid at room temperature, such as waxes, fatty substances, or fatty substances. gums and mixtures thereof. These fatty substances may be of animal, vegetable, mineral or synthetic origin. This fatty phase may, in addition, contain lipophilic organic solvents. As liquid fatty substances at room temperature, often called oils, usable in the invention include: hydrocarbon oils of animal origin such as perhydrosqualene; vegetable hydrocarbon-based oils such as liquid triglycerides of fatty acids with 4 to 10 carbon atoms, such as trigly¬ cerides of heptanoic or octanoic acids, or sunflower, corn, soybean, grape seed, sesame, apricot, macadamia, castor oil, avocado, caprylic / capric acid triglycerides, jojoba oil, shea butter; linear or branched hydrocarbons of mineral or synthetic origin, such as paraffin oils and their derivatives, petroleum jelly, polybutenes, 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, oleyl alcohol; fluoro oils par¬ tially hydrocarbon and / or silicone; silicone oils, such as volatile or non-volatile polymethylsiloxanes (PDMS), linear or cyclic, liquid or pasty at room temperature, such as cyclomethicones, dimethicones, optionally comprising a phenyl group, such as phenyltrimethicones or phenyltrimethylsiloxydiphenylsiloxanes; diphenylmethyldimethyltrisiloxanes, diphenyl dimethicones, phenyl dimethicones, polymethylphenyl siloxanes; their mixtures. These oils may be present in a content ranging from 0.01 to 90%, and better still from 0.1 to 85% by weight, relative to the total weight of the composition.

The composition according to the invention may also comprise one or more organic solvents which are physiologically acceptable. These solvents may be generally present in a content ranging from 0.1 to 90%, preferably from 0.5 to 85%, more preferably from 10 to 80% by weight, relative to the total weight of the composition, and better from 30 to 50%. Mention may in particular be made, in addition to the hydrophilic organic solvents mentioned above, ketones that are liquid at ambient temperature, such as methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, isophorone, cyclohexanone, acetone; propylene glycol ethers which are liquid at room temperature, such as propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, and dipropylene glycol mono-butyl ether; short-chain esters (having 3 to 8 carbon atoms in total) such as ethyl acetate, methyl acetate, propyl acetate, n-butyl acetate, isopentyl acetate; ethers which are liquid at 25 ^° C., such as diethyl ether, dimethyl ether or dichlorodiethyl ether; alkanes liquid at 25 ^° C such as decane, heptane, dodecane, isododecane, cyclohexane; aromatic cyclic compounds liquid at 25 ° C such as toluene and xylene; liquid aldehydes at 25 ° C such as benzaldehyde, acetaldehyde and mixtures thereof.

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 25 ° C. at 120 ^° C. By bringing the wax to the liquid state (melting), it is possible to render it miscible with the oils which may be present and to form a homogeneous mixture microscopically, but by reducing the temperature of the mixture to at room temperature, a recrystallization of the wax is obtained in the oils of the mixture. The melting point of the wax may be measured using a differential scanning calorimeter (DSC), for example the calorimeter sold under the name DSC 30 by the company METTLER. 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 30 ^° C. and better still greater than 45 ° C. As wax useful 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 bodies are generally hydrocarbon compounds such as lanolines and their derivatives or PDMS. The nature and the quantity of solid bodies depend on the mechanical properties and textures sought. As an indication, the composition may contain from 0.1 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, in a particulate phase, pigments and / or nacres and / or fillers usually used in cosmetic compositions. The composition may also comprise other dyestuffs chosen from water-soluble dyes and / or liposoluble dyes well known to those skilled in the art. By pigments, it is necessary to include particles of any shape, white or colo¬, mineral or organic, insoluble in the physiological medium, intended to color the composition. By fillers, it is necessary to include colorless or white particles, mineral or synthetic, lamellar or non-lamellar, intended to give the body or rigidity to the composition, and / or softness, dullness and uniformity make-up. 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 present in the composition in a proportion of 0.01 to 25% by weight of the final composition, and preferably in a proportion of 3 to 10% by weight. They can be white or colored, mineral or organic ,. There may be mentioned oxides of titanium, zirconium or cerium, as well as oxides of zinc, iron or chromium, ferric blue, chromium hydrate, carbon black, magnes (polysulfides). aluminosilicates), manganese pyrophosphate and certain metallic powders such as those of silver or aluminum. D & C pigments and lacquers commonly used to give the lips and the skin a make-up effect, which are salts of calcium, barium, aluminum, strontium or zirconium, may also be mentioned. The nacres may be present in the composition in a proportion of 0.01 to 20% by weight, preferably at a rate of the order of 3 to 10% by weight. Among the possible na¬ cres, mention may be made of natural mother-of-pearl, mica coated with titanium oxide, iron oxide, natural pigment or bismuth oxychloride, as well as colored titanium mica. Among the dyes, liposoluble or water-soluble, which may be present in the composition, alone or as a mixture, in a proportion of 0.001 to 15% by weight, preferably 0.01 to 5% by weight and especially 0.1 to 5% by weight. 2% by weight, relative to the total weight of the composition, mention may be made of the disodium salt of culvert, the sodium salt of alizarin green, the yellow of quinoline, the trisodium salt of amaranth, the disodium salt of tartrazine, monosodium salt of rhodamine, disodium fuchsin salt, xanthophyll, methylene blue, cochineal carmine, colophony halo-acid, azo, anthraquinone, copper or iron sulphate, Sudan brown, Sudan red and annatto, as well as beet juice and carotene. 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 02% to 30% by weight. The fillers may be mineral or organic in any form, platelet-shaped, spherical or oblong. Mention may be made of talc, mica, silica, kaolin, polyamide (Nylon®), poly-β-alanine and polyethylene powders, tetrafluoroethylene (Teflon®) polymer powders, lauroyl-lysine, starch, boron nitride, polymeric hollow microspheres such as those of polyvinylidene chloride / acrylonitrile such as Expancel® (Nobel Industry), copolymers of acrylic acid (Polytrap® from Dow Corning) and mi Silicone resin crumbers (eg Toshiba Tospearls®), elastomeric polyorganosiloxane particles, precipitated calcium carbonate, magnesium carbonate and hydrobromide, 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 stearate. , 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 filtering 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, cosmetic active agents, moisturizers, anti-oxidants, 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 additional 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, impaired by the addition envisaged. In particular, those skilled in the art will preferably ensure, when the composition comprises a fatty phase which comprises organic liquid compounds other than those present in the dispersion medium, that these other compounds are selected so that the ethylenic polymer remains in the dispersion state in said fatty phase.

The compositions according to the invention can be in any acceptable and conventional form for a cosmetic, hygienic or pharmaceutical composition, and especially in the form of suspension, dispersion, solution, gel, emulsion, in particular oil-based emulsion. in-water (O / W) or water-in-oil (W / O), or multiple (W / O / E or polyol / H / E or O / W / H), in the form of cream, dough, foam, dispersing vesicles including ionic lipids or not, two-phase lotion or multiphase, spray, powder, paste. The composition may be anhydrous, for example it may be a stick or 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 solu¬ bility in the support, and secondly the application envisaged for composi¬ tion.

The in particular cosmetic composition according to the invention can be in the form of a product for the care, cleaning and / or make-up of the skin of the body or of the face, the lips, the nails, the eyelashes, the eyebrows and / or hair, a sunscreen or self-tanning product, a hair product for care, treatment, shaping, makeup or hair coloring.

It can thus be in the form of a makeup composition, not¬ ingly a product for the complexion such as a foundation, a blush or pau¬; a lip product such as a lipstick or a lip care; a concealer product; a blush, a mascara, an eyeliner; a makeup product eyebrows, a lip pencil or eye; nail product such as nail polish or nail care; a body make-up product; a hair makeup product (mascara or hairspray). It may also be in the form of a composition for protecting or caring for the skin of the face, neck, hands or body, in particular an anti-wrinkle composition, a moisturizing or treating composition; a solar composition (anti-UV) or artificial tanning. It may also be in the form of a hair product, especially for coloring, maintaining the hairstyle, shaping the hair, care, treatment or cleaning of the hair, such as shampoos, gels, styling lotions, blow-drying lotions, fixing and styling compositions such as lacquers or spray. The subject of the present invention is also a cosmetic treatment method for the care, cleaning and / or makeup of keratin materials such as the skin, the scalp, the eyelashes, the eyebrows, the hair, the lips, the skin and the skin. On¬ gels, comprising the application on said keratin materials, of a cosmetic composition as defined above.

The invention is further illustrated by the following examples.

Measurement methods In the present application and in the examples, after the preparation of said dispersion, the average molecular weight masses (Mw) and the number (Mn) of the polymer are determined, and the solids content (or extract sec) of the dis¬ persion.

The average molar masses by weight (Mw) and by number (Mn) are determined by gel permeation liquid chromatography (solvent THF, calibration curve established with linear polystyrene standards, refractometric detector and UV).

The level of dry matter (or dry extract), ie the content of non-volatile matter, can be measured in different ways: for example, oven drying methods or exposure drying methods can be mentioned. to infrared radiation. Preferably, the solids content is measured by heating the sample with infrared rays of 2 μm to 3.5 μm wavelength. The substances in the composition which have a high vapor pressure evaporate under the effect of this radiation. The measurement of the loss of weight of the sample makes it possible to determine the dry extract of the composition. These measurements are carried out using a Mettler LP16 commercial infrared desiccator. This technique is perfectly described in the documentation of the device supplied by Mettler. The measurement protocol is as follows: about 1 g of the composition is spread on a metal cup. This, after introduction into the desiccator, is subjected to a temperature setpoint of 120 ^° C. for one hour. The wet mass of the sample, corresponding to the initial mass and the dry mass of the sample, corresponding to the mass after exposure to radiation, are measured using a precision balance. The solids content is calculated as follows: Dry extract = 100 x (dry mass / wet mass). Example 1

1 / first step

In a 2-liter flask, under an inert atmosphere (nitrogen), 26.9 g (0.116 mol) of 4-chloro-1,8-naphthalic anhydride are added, followed by the addition of 450 ml of toluene. Mix at 500 rpm. for a few minutes, then 14.0 g (0.139 mol) of 1-hexylamine, previously dissolved in 100 ml of toluene, are introduced dropwise. The mixture is heated to reflux and another 50 ml of toluene is added. Refluxing is continued for 24 hours. The resulting reaction mixture is then allowed to cool to room temperature. The product is concentrated under reduced pressure. The organic phase is recovered and recrystallized from ethanol. 29.0 g of pale yellow crystals are obtained (yield 79.4%)

Characterization ¹ H-NMR (CDCl ₃ , 400MHz) δ: 8.67-8.65 (2H), 8.51-8.49 (1H), 7.87-7.85 (1H), 7.83-7.81 (1H), 4.18-4.14 (2H), 1.74 -1.70 (2H), 1.44-1.32 (6H), 0.90-0.87 (3H).

2 / second step

1.5 g (64 mmol) of sodium hydrate (NaH) are placed in a flask under an inert atmosphere of argon; 300 ml of THF (tetrahydrofuran) are added and the reaction mixture is cooled to 0 ^° C. 2.4 g (32 mmol) of 1,3-propanediol premixed with 100 ml of THF are added, and mix vigorously. The mixture is heated at 60 ° C. for 20 minutes and then cooled to room temperature (25 ^° C.). A mixture consisting of 10 g (32 mmol) of naphthalimide in 150 ml of THF is then added. The mixture is heated under reflux for 3 hours, then 10 ml of ethanol are added, the mixture is heated for 15 minutes, and the solvent is evaporated off under reduced pressure in order to obtain a greenish residue which is washed with sodium acetate. ethyl and water. 8.6 g of a pale yellow powder are then obtained (yield 75.5%). Characterization ¹ H-NMR (CDCl ₃ , 400MHz) δ: 8.61-8.59 (2H), 8.55-8.53 (1H) ₁ 7.72-7.68 (1H), 7.08-7.06 (1H), 4.45-4.42 (2H), 4.17 -4.13 (2H), 4.00-3.97 (2H), 2.28-2.22 (2H), 1.76-170 (2H), 1.44-1.32 (6H), 0.90-0.87 (3H).

3 / Third step

8.0 g (22.5 mmol) of 4- (oxy-3-propanol) -N-hexyl naphthalimide are placed in a three-necked flask equipped with a condenser and placed under an inert atmosphere of argon. 150 ml of dichloromethane are added and the solution is stirred until a homogeneous solution is obtained. 4.6 g (45.0 mmol) of triethanolamine and then 4.1 g (45.0 mmol) of acryloyl chloride are then added, with stirring at 0 ^° C. The evolution of the reaction is monitored by TLC (thin layer chromatography), and when there are no more starting compounds, 50 ml of water are added. The reaction solution is then washed with a saturated aqueous solution of NaCl and then dried over sodium sulfate. The solvents are evaporated under reduced pressure and 9.2 g of a pale yellow powder are obtained (100% yield).

Characterization ¹ H-NMR (CDCl ₃ , 400MHz) δ: 8.59-8.57 (1H), 8.54-8.52 (1H), 8.51-8.50 (1H), 7.70-7.66 (1H), 7.03-7.01 (1H) , 6.44-6.40 (1H), 6.17-6.10 (1H), 5.86-5.83 (1H), 4.49- 4.46 (2H), 4.39-4.36 (2H), 4.16-4.12 (2H), 2.38-2.35 (2H) , 1.71-1.69 (2H), 1.44-1.31 (6H), 0.89-0.86 (3H).

Example 2

1 / first step

In a 2-liter flask under an inert atmosphere (argon), 20.0 g (0.086 mol) of 4-chloro-1,8-naphthalic anhydride are added, and then 250 ml of toluene are added. The mixture is heated to 100 ⁰ C and stirred until the solution becomes homo¬ gene. Then (500 rpm) is mixed and 12.0 g (0.095 mol) of cyclooctylamine, previously dissolved in 50 ml of toluene, are introduced dropwise. The mixture is heated to reflux. Refluxing is continued for 5 hours. The resulting reaction mixture is then allowed to cool to room temperature. The solid phase is recovered by filtration, washed with water and dried. 23.9 g of pale yellow powder are obtained (yield 81.2%).

Characterization ¹ H-NMR (CDCl ₃ , 400MHz) δ: 8.63 - 8.61 (1H), 8.57 - 8.55 (1H), 8.47 - 8.45 (1H), 7.85 - 7.79 (2H), 5.32 - 5.27 (1H) ), 2.52 - 2.44 (2H), 1.86 - 1.57 (12H).

2 / second step

20.0 g (0.059 mol) of N-cyclooctyl-4-chloro-1,8-naphthalimide are placed in a three-necked flask equipped with a condenser and placed under an inert atmosphere of argon. 18.1 g (0.176 mol) of pentan-5-ol amine are then added and then heated up to 140 ^° C. so as to obtain a homogeneous solution. Allowed to react at 140 ^° C. for 3 hours, then allowed to cool to room temperature. The reaction solution is mixed with 125 ml of dichloromethane and washed with water and sodium bicarbonate. The product is precipitated in dichloromethane and the precipitate is filtered off, washed with water and dried. 24.1 g of yellow crystals (100% yield) are obtained.

Characterization ¹ H-NMR (CDCl _3, 400MHz) δ: 8.55-8.42 (2H) ₁ 8.07-8.04 (1H), 7.61 to 7.57 (1H), 6.72 to 6.70 (1H) , 5.35-5.30 (1H), 3.74-3.71 (2H), 3.43-3.40 (2H), 2.54-2.46 (2H), 1.90-1.54 (19H).

3 / third step

In a 1-liter flask, under an inert atmosphere (argon), 15.0 g (0.037 mol) of N-cyclooctyl-4- (aminopentan-5-ol) -1,8-naphthalimide are added, and then 175 ml of dichloromethane. The mixture is stirred until a homogeneous solution. 11.1 g (0.110 mol) of triethanolamine are then introduced. With stirring (500 rpm) and at 38 ° C, a mixture of 3.7 g (0.040 mol) of acryloyl chloride in 10 ml of THF is added dropwise. Allowed to react for 2 hours, then the solvent is evaporated under reduced pressure. Dichloromethane is added to the organic phase, which is then washed with water and sodium bicarbonate, then again with water. The organic phase is dried over sodium sulphate and filtered. The organic phase is evaporated and 16.1 g of product are recovered (yield: 94.8%).

Characterization ¹ H-NMR (CDCl ₃ , 400MHz) δ ppm: 8.54-8.52 (1H), 8.43-8.41 (1H), 8.11-8.08 (1H), 7.60 -7.56 (1H), 6.71-6.69 (2H), 6.42-6.38 (1H), 6.15-6.08 (1H), 5.84-5.81 (1H), H), 5.31-5.29 (1H), 4.23-4.20 (2H), 3.75-3.72 (1H), 3.44-3.39 (2H), 2 , 53-2.45 (2H), 1, 86-1, 56 (18H)

Example 3

This example illustrates the preparation of a polymer forming a dispersion of particles in a hydrocarbon solvent (here isododecane), said polymer being obtained by polymerization of methyl acrylate, the monomer of Example 1 and the macromonomer corresponding to a polyethylene / polybutylene copolymer (Kraton L-1253) of Mw = 4000.

The procedure for preparing this particular polymer is as follows. In a 250 ml reactor, 2 g of the monomer prepared in Example 1 and 30 g of toluene are charged and stirred until dissolved. 14 g of methyl acrylate, 70 g of toluene and 1.6 g of t-butyl peroxy-2-ethylhexanoate (Trigonox 21S) are then added. 6 g of the macromonomer of the polyethylene / polybutylene copolymer type (Kraton L-1253) dissolved in 100 g of isododecane are stirred and stirred. The mixture is stirred and the reaction mixture is heated at 90 ^° C. After 15 minutes at 90 ^° C., a change in appearance of the reaction medium is observed, which changes from a transparent appearance to a milky yellow appearance. The heating is maintained with stirring for a further 15 minutes, then a mixture is added for 1 hour. consisting of 78 g of methyl acrylate and 1 g of Trigonox 21 S. The heating is then left for 3 hours at 90 ^° C. and then the toluene is distilled from the reaction medium. At the end of this distillation operation, a dispersion of thus prepared stable polymer particles in isododecane is obtained. The characteristics of the polymer and particles formed by said polymer are as follows: Mw: 29600 g / mol; Mn: 12000 g / mol - Dry extract: 55.8% in isododecane, made by thermobalance.

Example 4

In a 250 ml reactor, 4 g of polyethylene / polybutylene copolymer (Kraton L-1253) macromonomer dissolved in 50 g of isododecane, 6 g of methyl acrylate, 35 g of heptane and 8 g of t-butyl peroxy-2-ethylhexanoate (Trigonox 21S). The mixture is stirred and the reaction mixture is heated at 90 ^° C. After 15 minutes at 90 ^° C., a change in appearance of the reaction medium is observed, which changes from a transparent appearance to a milky white appearance. The following two mixtures are then added simultaneously over the course of 40 minutes: - mixture 1: 38.5 g of methyl acrylate and 0.5 g of Trigonox 21 S. - mixture 2: 1, 5 g of monomer prepared with Example 2 solubilized in 15 g of THF. Heating is then left for 6 hours at 90 ^° C., then the THF and heptane are distilled from the reaction medium, and 50 g of isododecane are added. At the end of this distillation operation, a milky yellow dispersion of polymer particles thus prepared stable in isododecane is obtained. The characteristics of the polymer and the particles formed by said polymer are as follows: Dry extract: 51.7% in isododecane, produced by thermobalance.

Example 5

A lipstick stick having the following composition is prepared: Polyethylene wax 15% Polymer dispersion of Example 3 (at 55.8% DM) 10% Polyisobutene hydrogenated (Parleam of Nippon OiI Fats) 26% Pigments 8 , 6% Isododecane qs 100%

The composition obtained after application to the lips has good cosmetic properties.

Example 6: E / H foundation A foundation composition is prepared comprising the following compounds

Phase A Cetyl dimethicone copolyol 3 g (ABIL EM 90 from GOLDSCHMIDT) Isostearyl diglyceryl succinate 0.6 g (IMWITOR 780K from CONDEA) Isododecane 18.5 g Pigments (iron oxides of titanium) 10 g Dispersion of polymer of Example 4 8.7 g in MSA Polyamide powder (NYLON-12) 8 g Perfume qs Phase B Water qs 100 g Magnesium sulphate 0.7 g Preservative qs

The resulting composition has good cosmetic properties.

Claims

1. Dispersion, in a non-aqueous organic medium, of particularly solid particles consisting of at least one ethylenic polymer comprising an insoluble backbone in said medium, and a portion soluble in said medium consisting of side chains covalently bonded to said backbone, said ethy¬ lenic polymer being capable of being obtained by radical polymerization: - of at least one monomer with an optical effect of formula (I):

in which :

- R1 represents a linear, branched and / or cyclic carbon radical, saturated and / or unsaturated, comprising 1 to 32 carbon atoms; optionally substituted with one or more groups selected from = O, OH, NH 2, and halogen atoms; and / or optionally interrupted by one or more heteroatoms chosen from O, N ₁ P, Si and S;

R2 and R3, present on the same ring or each on a different ring, represent, independently of one another, a hydrogen, a halogen, or a group of formula -XGP (II), under the proviso that at least one of R 2 and / or R 3 is a group of formula (II), wherein: X is selected from -O-, -S-, -SO-, -SO ₂ - , -NH- or -NR4- with R4 representing a linear, branched and / or cyclic carbon radical, saturated and / or unsaturated, comprising 1 to 30 carbon atoms, optionally substituted with one or more groups selected from = O, OH, NH ₂ , and halogen atoms; and / or optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S; G is a linear, branched and / or cyclic, saturated and / or unsaturated divalent carbon radical comprising 1 to 32 carbon atoms, optionally substituted by one or more groups chosen from = 0, OH, NH ₂ , and the atoms of halogen; and / or optionally interrupted by one or more heteroatoms chosen from O, N, P, Si and S; P is a polymerizable group chosen from one of the following formulas:

^{(| Lla)} (IIIb) (MIC) in which: - R ¹ represents H or a hydrocarbon radical, linear or branched, saturated C1-6 - X ¹ represents O, NH or NR "with R" representing a radical chosen from C1-6 alkyl, C6-10 aryl, C6-10 aryl alkyl (C1-6) or (C1-6) alkyl aryl (C6-10), alkyl and / or aryl groups; may also be substi¬ killed by one or more groups selected from OH, halogen, C1-C6 alkoxy and C6-10 aryloxy; and - m is 0 or 1; n is 0 or 1 and p is 0, 1 or 2.

to form said insoluble skeleton; and at least one macromonomer comprising a polymerizable end group capable of forming the side chains.

2. Dispersion according to claim 1, wherein, in the formula (I), R1 is a cyclic hydrocarbon radical, linear and / or branched, saturated or unsaturated, com¬ possibly taking a hydrocarbon ring itself saturated or unsaturated, com ¬ taking 3 to 18, especially 4 to 14, carbon atoms, and may comprise at least one heteroatom, including one or two nitrogen atoms, oxygen or silicon.

3. Dispersion according to one of the preceding claims, wherein, in the formula (I), R1 is selected from n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, cyclopentyl , n-hexyl, cyclohexyl, n-heptyl, n-octyl, cyclooctyl, decyl, cyclodecyl, dodecyl, cyclododecyl, p-tert-butylcyclohexyl, benzyl, phenyl, or a radical selected from ethyl-2-N-pyrrolidine, 2-methyl) -1-ethylpyrrolidine, 3-propyltriethoxysilane, dialkylpyrimidines and especially 2- (4,6-dimethyl) -pyrimidine, benzothiazyl radical, fluorenyl radical.

4. Dispersion according to one of the preceding claims, wherein the radical R2 is a hydrogen atom and R3 a group of formula (II).

5. Dispersion according to one of the preceding claims, wherein in 1'¬ said group of formula (II), X is selected from -O-, -S-, -NH- or -NR4-, with R4 representing a radical linear hydrocarbon, branched and / or cyclic, saturated or unsaturated, comprising 1 to 18, in particular 2 to 12 carbon atoms, said radical optionally comprising a hydrocarbon ring which is itself saturated or unsaturated, and / or said radical being optionally substituted with one or more groups chosen from = 0, OH, NH ₂ , and the halogen atoms, and / or said radical being optionally interrupted by one or more heteroatoms chosen from O, N, P , Si and S.

6. Dispersion according to one of the preceding claims, wherein G is a divalent linear, branched and / or cyclic hydrocarbon radical, saturated or unsaturated, optionally comprising a hydrocarbon ring which is itself saturated or unsaturated, comprising in total 2 to 18, in particular 3 to 10 carbon atoms, optionally substituted by one or more groups selected from = O, OH, NH ₂ , and halogen atoms; and / or optionally interrupted by one or more heteroatoms selected from O, N, P, Si.

7. Dispersion according to one of the preceding claims, wherein G is selected from saturated linear or branched divalent hydrocarbon radicals optionally comprising a saturated hydrocarbon ring, comprising in total 2 to 18, in particular 3 to 10 carbon atoms.

8. Dispersion according to one of the preceding claims, wherein P is chosen from one of the following formulas:

in which R ¹ represents H or methyl.

9. Dispersion according to one of the preceding claims, wherein the monomer of formula (I) is chosen from compounds corresponding to one of the following formulas:

10. Dispersion according to one of the preceding claims, wherein the mo¬ nomère of formula (I), alone or in mixture, is present in a proportion of 0.005 to 40% by weight, in particular 0.01 to 20% by weight, even 0.1 to 10% by weight, and more preferably 0.5 to 5% by weight, relative to the weight of the final ethylenic polymer.

11. Dispersion according to one of the preceding claims, wherein the ma¬ cromonomer comprises at the end of the chain a polymerizable terminal group which is a vinyl group, preferably an acrylate or methacrylate group.

12. Dispersion according to one of the preceding claims, wherein the ma¬ cromonomer is selected from macromonomers whose homopolymers have a glass transition temperature (Tg) less than or equal to 25 ⁰ C, in particular ranging from -100 ⁰ C to 25 ⁰ C ₁ preferably ranging from -80 ⁰ C to 0 ° C inclusive.

13. Dispersion according to one of the preceding claims, wherein the ma¬ cromonomer has a weight average molecular weight (Mw) ranging from 200 to 100,000, preferably from 300 to 50,000, especially 500 to 20,000, preferably approximately 800 to 10,000, or even 1,000 to 6,000.

14. Dispersion according to one of the preceding claims, wherein the ma¬ cromonomer is selected from non-silicone macromonomers, including carbon, and silicone macromonomers, in particular organopolysiloxane, in particular polydimethylsiloxane.

15. Dispersion according to one of the preceding claims, wherein the monomer is selected from: - (i) homopolymers and copolymers of C6-C22 linear or branched alkyl (meth) acrylate, preferably C8-C22; C18, having a polymerizable terminal group selected from vinyl or (meth) acrylate; and in particular the monomers of poly (2-ethylhexyl acrylate) with a monoacrylate or monomethacrylate end; macromonomers of poly (dodecyl acrylate) or of poly (dodecyl methacrylate) with a monoacrylate or monomethacrylate end; macromonomers of poly (stearyl acrylate) or poly (stearyl methacrylate) with monoacrylate or monomethacrylate end.

(ii) polyolefins having an ethylenically unsaturated terminal group of vinyl type or preferably having a (meth) acrylate end group; and in particular the following macromonomers, it being understood that they have a (meth) acrylate terminal group: polyethylene macromonomers, polypropylene macromonomers, polyethylene / polypropylene copolymer macromonomers, polyethylene / polybutylene copolymer macromonomers, macromono ¬ mothers of polyisobutylene; polybutadiene macromonomers; polyisoprene macromolecamers; poly (ethylene / butylene) - polyisoprene macromonomers;

(iii) polydimethylsiloxanes with a mono (meth) acrylate end group, and in particular those of formula (IIa) below:

in which: - Rs denotes a hydrogen atom or a methyl group; preferably methyl; - Rg 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 linkages; preferably ethylene, propylene or butylene; Rio 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.

16. Dispersion according to one of the preceding claims, wherein the ma¬ cromonomer, alone or in mixture, is present in the ethylenic polymer in a proportion of 0.5 to 20% by weight, especially 1 to 18% by weight. weight, preferably 2 to 16% by weight, and especially 4 to 15% by weight, among others from 6 to 13% by weight, or even 8 to 12% by weight, relative to the total weight of said polymer.

17. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one compound selected from: - non-aqueous non-silicone liquid compounds having an overall solubility parameter according to Hansen solubility space less than or equal to (MPa) ^1/2 , preferably less than or equal to 18 (MPa) ^1/2 , even more preferably less than or equal to 17 (MPa) ^1/2 - monoalcohols having an overall solubility parameter according to the solubility space - Hansen's unit less than or equal to 20 (MPa); the non-aqueous silicone liquid compounds having an overall solubility parameter according to the Hansen solubility space less than or equal to 20 (MPa) ^1/2 , preferably less than or equal to 17 (MPa) ^1/2, and mixtures thereof.

18. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one non-volatile oil selected from: non-volatile oils, non-silicone, especially hydrocarbon, such as liquid paraffin (or petroleum jelly), squalane hydrogenated polyisobutylene (Parléam oil), perhydrosqualene, mink, turtle, soybean oil, sweet almond oil, calophyllum oil, palm oil, grape seed oil, sesame oil, corn oil, arara, colza, sunflower, cotton, apricot, castor oil, avocado, jojoba, olive or cereal sprouts; esters of lanolic acid, oleic acid, lauric acid, stearic acid; esters derived from acids or long-chain alcohols (that is to say having from 6 to 20 carbon atoms), in particular the esters of for¬ mule RCOOR 'in which R represents the residue of an acid higher fatty acid containing 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-ethyl-hexyl palmate, 2-hexyl-decyl laurate, palmitate of 2- octyl decyl, myristate or 2-octyl-dodecyl lactate, di (2-ethyl hexyl) succinate, diisostearyl malate, glycerin or diglycerin triisostearate; higher fatty acids, especially C14-C22, such as myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid or isostearic acid; higher fatty alcohols, especially in C16-C22, such as cetanol, oleic alcohol, linoleic or linolenic alcohol, isostearyl alcohol or octyl dodecanol; and their mixtures.

19. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one volatile oil selected from non-silicone volatile oils, including isoparaffins Cs-C-iβ such as isododecane, isodecane, isohexadecane.

20. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one compound selected from: - linear esters, branched or cyclic, having more than 6 carbon atoms, especially 6 to 30 carbon atoms, - ethers having more than 6 carbon atoms, especially 6 to 30 carbon atoms; and ketones having more than 6 carbon atoms, especially 6 to 30 carbon atoms. linear, branched and / or cyclic alkanes which are optionally volatile, and in particular paraffin oils, petroleum jelly or hydrogenated polyisobutylene. aliphatic fatty alcohols having 6 to 30 carbon atoms, the hydrocarbon chain having no substitution group, such as oleic alcohol, decanol, dodecanol, octadecanol and linoleic alcohol.

21. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one nonvolatile silicone oil selected from: non-volatile polydialkylsiloxanes, such as non-volatile polydimethylsiloxanes (PDMS); polydimethylsiloxanes comprising alkyl, alkoxy or phenyl groups, during or at the end of the silicone chain, groups having from 2 to 24 carbon atoms; phenyl silicones such as phenyl trimethicones, phenyl dimethicones, phenyl trimethylsiloxy diphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes, polymethylphenylsiloxanes; polysiloxanes modified with fatty acids (especially C8-C20), with fatty alcohols (especially C8-C20) and / or with polyoxyalkylenes (especially polyoxyethylene and / or polyoxypropylene); aminated polysiloxanes; polysiloxanes containing hydroxyl groups; fluorinated polysiloxanes comprising a fluorinated group during or at the end of the silicone chain having from 1 to 12 atoms of carbon, all or part of the hydrogen atoms of which are substituted by fluorine atoms; and their mixtures.

22. Dispersion according to one of the preceding claims, wherein the organic medium comprises at least one volatile silicone oil selected from: linear or cyclic sili¬ cones having from 2 to 7 silicon atoms, these silicones optionally comprising alkyl groups or alkoxy having from 1 to 10 carbon atoms, and in particular octamethylcyclotetrasiloxane, decamethylcyclopentane tasiloxane, dodecamethylcyclohexasiloxane, rheptamethylhexyltrisiloxane, rheptamethyloctyltrisiloxane, roctamethyltrisiloxane, decamethyltetrasiloxane and mixtures thereof.

23. Dispersion according to one of the preceding claims, wherein the ethylene polymer is obtainable by radical polymerization of: at least one optical effect monomer of formula (I) mixed with at least one monomer additional ethylenic, to form said insoluble skeleton; and at least one macromonomer comprising a polymerizable end group capable of forming the side chains.

24. Dispersion according to claim 23, wherein the additional ethylenic monomer, alone or as a mixture, is present in a proportion of 40 to 99.495% by weight, in particular 50-98% by weight, or even 60 to 95% by weight, of preferably 75 to 92% by weight, or even 80 to 90% by weight, relative to the weight of the final ethylenic polymer.

25. Dispersion according to one of claims 23 to 24, wherein the additional ethylenic monomer comprises at least one (meth) acrylic monomer, which alone or in mixture, preferably represents 60 to 100% by weight, in particular 75 to 99, 5% by weight, or even 85 to 99% by weight, of the total weight of additional ethylenic monomers, the optional 100% complement being constituted by non-(meth) acrylic ethylenic monomers, alone or as a mixture.

26. Dispersion according to claim 25, wherein the (meth) acrylic monomer is chosen from, alone or as a mixture, the following monomers, as well as their salts:

(i) (meth) acrylates of formula CH ₂ = CHCOOR ' ₃ or CH ₂ = C (CH ₃ ) COOR' ₃ in which R ' ₃ represents: a linear or branched alkyl group comprising 1 to 18 atoms of carbon, in which is (are) optionally intercalated (s) one or more heteroatoms selected from O, N, S and P and / or said alkyl group may be optionally substituted with one or more substituents selected from -OH, the atoms of halogen (Cl, Br, I and F), the -NR4R ₅ group, wherein R ₄ and R ₅ are identical or different, represent hydrogen or a linear or branched alkyl group, Ci-Ce or phenyl; and / or polyoxyalkylene groups, especially polyoxyethylene and / or polyoxypropylene, said polyoxyalkylene group consisting of the repetition of 5 to 30 oxyalkylene units; a C ₃ to C ₁₂ cycloalkyl group, said cycloalkyl group possibly comprising in its chain one or more heteroatoms chosen from O ₁ N, S and / or P, and / or which may be optionally substituted with one or more substituents; killers selected from -OH and halogen atoms (Cl, Br, I and F); a C ₃ to C ₂ aryl or C ₄ to C ₃₀ aralkyl group (C 1 to C ₈ alkyl group); in particular R'3 may be methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, tert-butyl, hexyl, ethylhexyl, octyl, lauryl, isooctyl, isodecyl, decyl, cyclohexyl, t-butylcyclohexyl, stearyl, ethyl- 2-perfluorohexyl, 2-hydroxyethyl, 2-hydroxybutyl, 2-hydroxypropyl, methoxyethyl, ethoxyethyl, methoxypropyl, isobornyl, phenyl, 2-phenylethyl, t-butylbenzyl, benzyl, furfurylmethyl or tetrahydrofurfurylmethyl, methoxy-polyoxyethylene (or POE-methyl) ); POE-behenyl, trifluoroethyl; dimethylaminoethyl, diethylaminoethyl, dimethylaminopropyl.

(ii) (meth) acrylamides of formula CH ₂ = CHCON R ' ₄ R' ₅ or CH ₂ = C (CH ₃ ) CONR ¹ ₄ R ¹ 5 in which R ' ₄ and R' s, which are identical or different, represent a hydrogen atom or: a) a linear or branched alkyl group containing from 1 to 18 carbon atoms in which one or more heteroatoms chosen from O, N, S are optionally intercalated; and P; said alkyl group may further be optionally substituted by one or more substituents selected from hydroxyl groups, halogen atoms (Cl, Br, I and F), and Si (R ₄ R ₅ ) groups, where R ₄ and R ₅ are identical or different, represent an alkyl group -C ₆ or phenyl; and especially a methyl, ethyl, propyl, n-butyl, isobutyl, tert-butyl, hexyl, ethylhexyl, octyl, lauryl, isooctyl, isodecyl, dodecyl, cyclohexyl, t-butylcyclohexyl or stearyl group; ethyl-2-perfluorohexyl; or a C1-hydroxyalkyl group. ₄ such as 2-hydroxyethyl, 2-hydroxybutyl and 2-hydroxypropyl; or alkoxy (Ci _-4) alkyl (C _1-4) such as methoxyethyl, ethoxyethyl and méthoxy¬ propyl, b) cycloalkyl, C ₃ to C _2, such as an isobornyl group, or a heterocycloalkyl group (C from 1 to 4 carbon atoms), such as furfurylmethyl or tetrahydrofurfurylmethyl, c) a C ₃ to C ₂ aryl group such as phenyl, d) a C ₄ to C ₃ aralkyl group (C ₁ to C ₄ alkyl group) to Ce) such as 2-phenylethyl, t-butylbenzyl or benzyl,

(iii) (meth) acrylic monomers containing ethylenic unsaturation (s) comprising at least one carboxylic, phosphoric or sulphonic acid function, such as acrylic acid, methacrylic acid, acrylamidopropanesulphonic acid, and their salts;

27. Dispersion according to one of claims 25 to 26, wherein the (meth) acrylic monomer is selected from methyl, ethyl, n-methyl (meth) acrylates. propyl, isopropyl, butyl, isobutyl; methoxyethyl or ethoxyethyl (meth) acrylates; trifluoroethyl (meth) acrylate; dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, acrylic acid, methacrylic acid, (meth) acrylamide, N-ethyl (meth) acrylamide, N-butyl (meth) acrylamide, Nt-butyl (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethyl (meth) ) acrylamide, N, N-dibutyl (meth) acrylamide, N-octyl (meth) acrylamide, N-dodecyl (meth) acrylamide, rundecyl (meth) acrylamide, N (2-hydroxypropyl) (meth) acrylamide, dimethylaminopropyl (meth) acrylamide), as well as their salts; and their mixtures

28. Dispersion according to one of claims 25 to 26, wherein the (meth) acrylic monomer is selected from methyl acrylate, methyl methacrylate, acrylic acid and methacrylic acid, and mixtures thereof.

29. Dispersion according to one of claims 23 to 28, wherein the additional ethylenic monomer is selected from: - vinyl esters of formula: FVCOO-CH = CHa wherein R ₆ represents a linear or branched alkyl group comprising 1 to 6 atoms, or a cyclic alkyl group having 3 to 6 carbon atoms and / or an aromatic group, for example of the benzene, anthracene, and naphthalenic type; ethylenic hydrocarbons having 2 to 10 carbons, such as ethylene, isoprene or butadiene; monomers containing ethylenic unsaturation (s) comprising at least one carboxylic acid, phosphoric or sulphonic acid function, or anhydride, such as, for example, crotonic acid, maleic anhydride, itaconic acid or acid; fumaric acid, maleic acid, styrenesulfonic acid, vinylbenzoic acid, vinylphosphoric acid and salts thereof; ethylenically unsaturated monomers containing at least one tertiary amine function, such as 2-vinylpyridine or 4-vinylpyridine; - vinyl compounds of formulas: CH2 ⁼ CH-R, CH2 ⁼ CH-CH2-R9 or CH2 = C (CH ₃₎ -CH 2 R 9 wherein R ₉ is a hydroxyl group, halogen (Cl or F), NH ₂ , ORi ₀ wherein R ₀ represents a phenyl group or an alkyl group Ci-Ci ₂ (the monomer is a vinyl or allylic ether); acetamide (NHCOCH ₃ ); an OCORn group where Rn represents a linear or branched alkyl group of 2 to 12 carbons (the monomer is a vinyl or allyl ester); or a group chosen from: a linear or branched alkyl group containing from 1 to 18 carbon atoms, in which one or more heteroatoms selected from O, N, S and optionally are interposed; P; said alkyl group may further be optionally substituted with one or more substituents selected from groups hydroxyl groups, halogen atoms (Cl, Br, I and F), and Si groups (FLtRs), wherein R ₄ and R _{5, which may be} identical or different, represent a C 1 -C 6 alkyl group or a phenyl group; a C ₃ -C ₈ cycloalkyl group such as isobornyl, cyclohexane, a C ₃ to C ₂ aryl group such as phenyl, a C ₄ to C ₃₀ aralkyl group (C ₁ to C 6 alkyl) group; C ₈ ) such as 2-phenylethyl; benzyl, - a 4- to 12-membered heterocyclic group containing one or more heteroatoms selected from O, N, and S, the ring being aromatic or not, - a heterocycloalkyl (alkyl of 1 to 4 C) group, such as furfurylmethyl or tetrahydrofurfurylmethyl, as well as their salts and mixtures thereof.

30. Dispersion according to one of claims 23 to 29, wherein the ethylenic monomer is selected from vinylcyclohexane, styrene, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl ethylhexanoate, vinyl neonononate, vinyl neododecanoate, vinyl methyl ether, vinyl ethyl ether and vinyl isobutyl ether.

31. Dispersion according to one of the preceding claims, wherein the ethylene polymer has a weight average molecular weight (Mw) com¬ between 10,000 and 500,000, especially between 20000 and 300 000, better still between 25000 and 200 000 or even between 30000 and 150000.

32. Dispersion according to one of the preceding claims, having a solids content (or solids content) polymer of 20% to 70% by weight of dry matter, especially 30 to 65% by weight, or even 40 to 60%. % in weight.

33. Cosmetic or pharmaceutical composition comprising, in a cosmetically or pharmaceutically acceptable medium, a dispersion according to one of the preceding claims.

34. Composition according to claim 33, in which the dispersion is present in a proportion of 3 to 95% by weight in the composition, in particular 4-90% by weight, or even 5-70% by weight, preferably 10 to 50% by weight. % in weight.

35. Composition according to one of claims 33 to 34, comprising at least one constituent selected from: - a hydrophilic medium comprising water or a mixture of water and organic solvent (s) hydrophilic (s) such as alcohols and in particular lower linear or branched monohydric alcohols containing from 2 to 5 carbon atoms, such as ethanol, isopropanol or n-propanol, and polyols such as glycerine, diglycerol, propylene glycol, sorbitol, pentylene glycol, and polyethylene glycols, or alternatively C ₂ ethers and hydrophilic C ₂ -C ₄ aldehydes. a fatty phase which may comprise fatty substances that are liquid at room temperature (generally 25 ° C.) and / or fatty substances that are solid at room temperature, such as waxes, pasty fatty substances, gums and their mixtures; lipophilic organic compounds; a particulate phase which may comprise pigments and / or nacres and / or fillers; water-soluble dyes and / or fat-soluble dyes; additional polymers, in particular film-forming polymers; vitamins, thickeners, gelling agents, trace elements, softeners, sequestering agents, perfumes, alkalizing or acidifying agents, preservatives, sunscreens, surfactants, cosmetic active ingredients, moisturizers, anti-oxidants, anti-hair loss agents, anti-dandruff agents, propellants, ceramides, or mixtures thereof.

36. Composition according to one of claims 33 to 35, in the form of a care product, cleaning and / or makeup of the skin of the body or face, lips, nails, eyelashes, eyebrows and / or hair, a sun or self-tanning product, a hair product for the care, treatment, shaping, makeup or hair coloring.

37. Composition according to one of claims 33 to 36, in the form of a makeup composition, especially a complexion product such as a foundation, a blush or eyeshadow; a lip product such as a lipstick or a 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 body make-up product; a hair makeup product; a composition for protecting or caring for the skin of the face, neck, hands or body, in particular an anti-wrinkle composition, a hy¬ orating or treating composition; a solar composition (anti-UV) or artificial tanning; a hair product, especially for coloring, maintaining the hairstyle, shaping the hair, care, treatment or cleaning of the hair, such as shampoos, gels, styling lotions, blow-dry lotions, fixing and styling compositions such as lacquers or spray.

38. Cosmetic treatment method for the care, cleaning and / or makeup of keratin materials such as the skin of the body or face, the scalp, the eyelashes, the eyebrows, the hair, the lips, the nails comprising the application on said keratin materials of a cosmetic composition as defined in one of claims 33 to 37.