EP3600226A1 - Dyed particles with a high pigment content - Google Patents

Abstract

The invention relates to a particle containing at least 3 wt. % of pigment(s) in relation to the weight of said particle. The invention also relates to a series of particles, in which each particle contains at least 3 wt. % of pigment(s) in relation to the weight of said particle, to a method for producing said series of particles, and to the uses thereof in cosmetic compositions, particularly make-up for keratinous materials.

Description

 COLORED PARTICLES WITH HIGH PIGMENT CONTENT

The present invention relates to pigment-rich colored particles for incorporation into cosmetic compositions, particularly makeup compositions and process for their preparation.

 As used herein, "cosmetic composition" means any cosmetic formulation intended to be applied to the skin, the hair and / or the nails.

 One of the main goals in cosmetics is to improve the external appearance of the skin, especially the face. Generally, foundations are used to improve the features or mask skin imperfections. These foundations are generally available in the form of liquid, semi-liquid or cream suspensions, emulsions, gels, as well as pressed powders or anhydrous oils and wax compositions.

 There is a need to develop new cosmetic compositions that offer new sensory experiences to the user and / or that are more effective. In recent years formulations have been developed in the form of macroscopic particles, in particular of the bead-like, hollow or solid, flexible or rigid type. These macroscopic particles confer a visual differentiating and very attractive, while protecting the encapsulated assets. However, existing macroscopic particles are generally not or very slightly colored and are used as skincare products whose coloring or the ability to color keratinous materials is / are largely insufficient (s).

 Some colored macroscopic particles comprising dyes (colored chemical substance soluble in the colored particle) have been described. However, their dye levels are very low. Few macroscopic colored particles comprising a pigment (powdery and insoluble chemical dye) are known, and their pigment contents are extremely low, and this makes them unsuitable for use as a make-up composition. In addition, these low levels of pigments are such that the corresponding cosmetic products have properties in terms of unsatisfactory coverage.

Because of their pulverulent and insoluble nature, the pigments are indeed difficult to integrate in the macroscopic particles. Indeed, the processes for preparing macroscopic particles generally implement solutions. However, introducing pigments into these solutions generally makes them very viscous, and the usual methods of preparation are then very difficult to implement. In addition, in the rare cases where it is possible to formulate a colored macroscopic particle comprising a pigment, it is possible to observe a phenomenon of sedimentation of the pigment inside the colored macroscopic particle. However, colored macroscopic particles in which the pigment is distributed throughout the macroscopic colored particle (or in the entire phase which contains them when the macroscopic particle is multiphasic and the pigment is in a phase) are sought.

 The development of macroscopic particles with high levels of pigment and not having the above disadvantages for cosmetic applications, in particular make-up, remains a constant objective.

 In particular, the present invention aims to provide a cosmetic composition comprising macroscopic particles and having properties satisfactory in terms of coverage.

For this purpose, the invention relates to a particle, in particular macroscopic, comprising at least 3% by weight of pigment (s), generally at least 5% by weight of pigment (s), in particular at least 10% by weight of pigment ( s), typically at least 13% by weight of pigment (s), based on the weight of said particle.

 The particles of the invention may comprise up to 50% by weight of pigment (s). When several pigments are present, this mass proportion is the cumulative proportion of pigments. These proportions are expressed in relation to the weight of particles. The particles according to the invention may in particular be called "colored particles" or "colored macroscopic particles". The particles according to the invention therefore comprise at least one pigment but are different from the pigments. Indeed, they comprise, in addition to pigments, other constituents, as explained in particular below. According to the invention, the pigments are one of the constituents of the particles of the invention but they are not the only constituents of said particles. The particles according to the invention are therefore different (or distinct) elements of pigment (s) as such (s).

The invention also relates to a series of particles as defined above. The invention also relates to a composition comprising at least one particle as defined above or at least one series of particles as defined above.

 The colored particles according to the invention have a substantially spherical shape.

 The particles according to the invention are advantageously macroscopic, that is to say visible to the naked eye.

 Their average diameters D are generally from 0.1 mm to 10 mm, in particular from 0.1 to 7 mm, preferably from 0.2 mm to 5 mm, typically from 0.3 mm to 3 mm, in particular from 0 to , 4 mm to 2.5 mm, for example from 0.5 mm to 2 mm. This diameter is advantageously measured on N colored particles using the "Image J" image processing software, on the basis of a snapshot of the colored particles taken in top view with a digital camera. Typically, according to this method, the diameter is measured in pixels, then reported in μηι, depending on the size of the container containing the colored particles. Preferably, the value of N is chosen to be greater than or equal to 30, so that this analysis reflects in a statistically significant manner the diameter distribution of the colored particles.

The diameter D _i of each colored particle is measured, then the average diameter D is obtained by calculating the arithmetic mean of these values D _i :

1 ^N

 D = -Y D

From these values D _t , one can also obtain the standard deviation σ of the diameters of the colored particles:

The standard deviation σ reflects the distribution of diameters _; colored particles around the average diameter D.

The coefficient of variation C _v can be calculated:

This parameter reflects the distribution of the diameters of the colored particles as a function of the average diameter of these particles. According to one embodiment, in the series of particles according to the invention, the coefficient of variation of the diameters of the colored particles is less than 10%, preferably less than 5%.

 According to one embodiment, in the aforementioned composition, the coefficient of variation of the diameters of the colored particles is less than 10%, preferably less than 5%.

 The colored particles can be monophasic or multiphasic. For example, they comprise a heart (which comprises at least one phase) and an envelope or membrane (which constitutes another phase) completely encapsulating the heart. The core is preferably liquid at 25 ° C. The heart can itself include one or more phases. Generally, the at least one pigment is in the phase (one of the phases) forming the core. The envelope completely encapsulating the core is typically based on at least one gelled polyelectrolyte and / or at least one polymer, preferably heat-sensitive, for example agar-agar. Each phase of the colored particles may be oily or aqueous.

 According to one embodiment, a particle according to the invention is a solid (or monophasic) particle. Among these particles, there may be mentioned particles based on at least one gelled polyelectrolyte and / or at least one polymer, preferably heat-sensitive, for example agar-agar. Preferably, there can be mentioned agar beads and particles formed of a single phase corresponding to the aforementioned gelled polyelectrolyte.

According to another embodiment, a particle according to the invention is a heart / shell particle (or core / shell), also designated by the term "capsule".

 According to one embodiment, a particle according to the invention is a capsule which comprises a liquid core or at least partially gelled or at least partly thixotropic and an envelope, preferably gelled, totally encapsulating said liquid heart, said liquid heart being monophasic, and in particular based on a predominantly aqueous phase or on the contrary a predominantly oily phase. Advantageously, the casing is based on at least one gelled polyelectrolyte and / or at least one polymer, preferably heat-sensitive, for example agar-agar.

Such a type of particle then corresponds to a simple capsule comprising two distinct phases, an internal liquid phase or at least partially gelled or at least partly thixotropic and an outer phase in the solid or gelled state surrounding the inner phase.

 According to a particular embodiment, a particle according to the invention is a capsule which comprises a liquid core or at least partially gelled or at least partially thixotropic and an envelope, preferably gelled, totally encapsulating said heart, said heart having a intermediate drop of an intermediate phase, the intermediate phase being placed in contact with the envelope, and at least one, preferably a single, internal drop of an inner phase disposed in the intermediate drop. Again, advantageously, the casing is based on at least one gelled polyelectrolyte and / or at least one polymer, preferably heat-sensitive, for example agar-agar. Advantageously, the ratio of the volume of the core to the volume of the gelled envelope is greater than 2, advantageously less than 50, and preferably is between 5 and 10. The intermediate phase is for example made based on an aqueous solution. or oily. When the intermediate phase is aqueous, the internal phase is oily, and conversely when the intermediate phase is oily, the internal phase is aqueous.

 Such a type of particle then corresponds to a complex capsule signifying that the liquid core, viscous or thixotropic, comprises a single intermediate drop of an intermediate phase, the intermediate phase being placed in contact with the envelope, and at least one of preferably a single internal drop of an inner phase disposed in the intermediate drop.

 According to one variant, the core comprises a continuous intermediate phase within which a plurality of internal phase drops (s) are located.

According to one embodiment, a particle according to the invention comprises a liquid heart or at least partially gelled or at least partly thixotropic and a shell, preferably gelled, completely encapsulating said heart, said heart having an intermediate drop of a oily phase, the oily phase being placed in contact with the shell, and at least one internal drop of an aqueous phase disposed in the intermediate drop.

According to another embodiment, a particle according to the invention comprises a liquid core or at least partially gelled or at least partially thixotropic and an envelope, preferably gelled, completely encapsulating said heart, said heart having an intermediate drop of an aqueous phase, the aqueous phase being placed in contact with the envelope, and at least one, preferably a single, internal drop of an oily phase disposed in the intermediate drop. Advantageously, the intermediate phase further comprises at least one gelling agent, especially as defined below. In particular, the gelling agent contributes to improving the suspension of the internal drop (s) disposed in the intermediate drop of the particles of the invention according to this embodiment. In other words, the gelling agent makes it possible to prevent / avoid the phenomena of creaming or sedimentation of the internal drop (s) arranged in the intermediate drop of the particles of the invention according to this method. embodiment.

 The colored particles comprise at least one pigment, preferably several pigments. The use of several pigments makes it possible to shade the color of the colored particles obtained as desired.

 By "pigment" is meant a coloring chemical substance insoluble in the colored particle (or the phase of the colored particle in which the pigment is present). By "insoluble" is meant that the solubility at 20 ° C of the pigment in the colored particle (or the phase of the colored particle in which the pigment is present) is less than 1 g / L, in particular less than 0.1 g / L, preferably less than 0.001 g / L.

 Each pigment may independently be an organic, inorganic or hybrid organic-inorganic pigment. These are typically inorganic pigments.

 As pigments, mention may especially be made of titanium dioxide, zinc dioxide, zirconium or cerium oxides, as well as iron or chromium oxides, manganese violet, ultramarine blue, hydrate of chromium and ferric blue, and their mixtures. The preferred inorganic pigments are iron oxides, especially red iron oxide, yellow iron oxide, brown iron oxide, black iron oxide, titanium dioxide and mixtures thereof.

 The pigment is preferably an iron oxide, especially red iron oxide, yellow iron oxide, brown iron oxide, black iron oxide and mixtures thereof.

 Each pigment of the colored particles may be an untreated pigment or a treated pigment. As used herein, the term "pigment treated" means a pigment which has been treated with an additive improving its dispersibility in an oily or aqueous composition, in particular one of the additives defined below. By "untreated pigment" or "pigment not treated" is meant a pigment which has not been treated with such an additive.

According to one embodiment, the phase comprising the pigment (s) is an aqueous phase. According to one embodiment, the phase comprising the pigment (s) is a greasy or oily substance.

 Preferably, when the phase comprising pigments is a fatty or oily phase, said phase also comprises hydrostearic acid, preferably in a content of between 0.5% and 10%, in particular between 3% and 6%. , by weight relative to the total weight of the phase under consideration. The presence of this particular compound is advantageous in that it makes it possible to reduce the viscosity of a powdered / oil mill (60:40), a fortiori of a phase highly loaded with pigments, and thus to make it more fluid and more easily processable, especially at the level of fluidic devices as described below.

 The colored particles are generally formed in whole or in part from at least one polymer, in particular at least one polysaccharide, such as an alginate, a gelatin, a pectin, a cellulose or a cellulose derivative, such as carboxymethylcellulose, agar-agar. According to a particular embodiment, the polysaccharide is a polyelectrolyte, a thermosensitive polysaccharide, and their mixture.

 The colored particles may comprise at least one gelling agent, in particular a heat-sensitive agent. This gelling agent makes it possible in particular to adapt the viscosity and / or to reduce or even prevent the sedimentation of the pigment (s), especially when present in a liquid phase at ambient temperature and atmospheric pressure.

 In the context of the invention, the term "gelling agent" is understood to mean an agent which makes it possible, at ambient temperature at atmospheric pressure, to increase the viscosity of the phase (s) containing it (neat) with respect to the same phase (s) without (e) said gelling agent, and in particular to reach a final viscosity of the phase (s) greater than 20 000 mPa.s, preferably greater than 50 000 mPa. s, better in excess of 100,000 mPa.s, and most preferably greater than 200,000 mPa.s.

 Preferably, the viscosity of the phase (s) forming the colored particles in the presence of said gelling agent is between 20,000 and 100,000,000 mPa.s, preferably between 50,000 and 1,000,000 mPa.s, and better still between 100,000. at 500,000 mPa.s at 25 ° C.

 The choice of agent (s) gelling (s) takes place especially with regard to the nature of the phase and is different from the polysaccharide forming all or part of the colored particles according to the invention. Thus, for compatibility reasons:

the gelling agent is hydrophilic when present in an aqueous phase, and the gelling agent is lipophilic when present in an oily phase.

The term "hydrophilic gelling agent" in the sense of the present invention, a compound capable of gelling the aqueous phase of the colored particles. The gelling agent may be water-soluble or water-dispersible. The hydrophilic gelling agent may be chosen from semi-synthetic polymeric gelling agents, synthetic polymeric gelling agents, natural or natural polymeric gelling agents, mixed silicates and pyrogenic silicas, and mixtures thereof. These hydrophilic gelling agents may be cationic, anionic, amphoteric or nonionic.

 The term "lipophilic gelling agent" means a compound capable of gelling the oily phase of the colored particles. The gelling agent is liposoluble or lipodispersible. The lipophilic gelling agent is advantageously chosen from particulate gelling agents; organopolysiloxane elastomers; semi-crystalline polymers; polyacrylates; sugar / polysaccharide esters, in particular dextrin esters, inulin esters, glycerol esters, in particular dextrin esters; hydrogen-bonded polymers; hydrocarbon block copolymers and mixtures thereof.

 The hydrophilic or lipophilic gelling agents may be chosen from those described in FR 3,025,096 or FR 3,025,103.

 The colored particles may further comprise a blooming filler.

 A bloomer load is likely to modify and / or hide the wrinkles by its intrinsic physical properties. These fillers can in particular modify the wrinkles by a tightening effect, a camouflage effect, or a blurring effect.

 As a blooming filler, the following compounds can be exemplified:

 porous silica microparticles, for example Myochi's Silica Beads® SB 150 and SB 700 of medium size of 5 m and SUNSPHERES® H series of Asahi Glass, such as H33, H51 of size of 3.5 and 5, respectively; μηι and Sensibead Si 175 and Sensibead Si 320 from Sensient Cosmetic Technologies respectively of sizes 7 μηι and 5 μηι;

hollow hemispherical particles of silicone resins, such as NLK 500®, NLK 506® and NLK 510® from Takemoto Oil and Fat, in particular described in EP 1 579 849; silicone resin powders such as, for example, SILICON Resin Tospearl® 145 A of GE silicone with a mean size of 4.5 μηι;

 powders of acrylic copolymers, in particular of methyl poly (meth) acrylate, for instance PMMA Jurimer MBI® particles of Nihon Junyoki with an average size of 8 μηι, the hollow spheres of PMMA sold under the name COVABEAD® LH 85 by the Sensient Cosmetic Technologies company and expanded vinylidene / acrylonitrile / methylene methacrylate microspheres sold under the name Expancel®;

 wax powders such as paraffin wax microloase® 14S particles of micropowders of average size of 7 μηι;

 polyethylene powders, in particular comprising at least one ethylene / acrylic acid copolymer, for example the FLOBEADS® EA 209 E from Sumimoto with an average size of 10 μηι;

 crosslinked elastomeric organopolysiloxane powders coated with silicone resin, in particular silsesquioxane under the name KSP 100®, KSP 101®, KSP 102®, KSP 103®, KSP 104® and KSP 105® by the company Shin Etsu. talc / dioxide or titanium / alumina / silica composite powders, for example Coverleaf AR 80® from Catalyst &Chemical;

 talc, mica, kaolin, lauryl glycine, starch powders crosslinked with octyanyl succinate anhydride, boron nitride, polytetrafluoroethylene powders, precipitated calcium carbonate, hydrocarbon carbonate, magnesium, barium sulfate, hydroxyapatite, calcium silicate, cerium dioxide and microcapsules of glass or ceramics;

 synthetic or natural hydrophilic or hydrophobic fibers, mineral or organic, such as silk, cotton, wool, flax, cellulose fibers extracted especially from wood, vegetables or algae, polyamide (Nylon®), modified cellulose, poly-p-phenylene terephtamide, acrylic, polyolefin, glass, silica, aramid, carbon, polytetrafluoroethylene (Teflon®), insoluble collagen, polyesters, polyvinyl chloride or vinylidene, polyvinyl alcohol, polyacrylonitrile, chitosan, polyurethane, polyethylene phthalate, fibers formed from a mixture of polymers, synthetic resorbable fibers, and mixtures thereof described in patent application EP 1 151 742;

spherical elastomeric cross-linked silicones such as Trefil E-505C® or E-506 C® from Dow Corning; abrasive fillers which, by a mechanical effect, provide a smoothing of the cutaneous microrelief, such as abrasive silica, for example Abrasif SP® from Semanez or walnut or shell powders (apricot, walnut, for example from Cosmetochem).

 The fillers having an effect on the signs of aging are chosen in particular from porous silica microparticles, hollow hemispherical silicone particles, silicone resin powders, acrylic copolymer powders, polyethylene powders and organopolysiloxane powders. crosslinked elastomers coated with silicone resin, talc / titanium dioxide / alumina / silica composite powders, precipitated calcium carbonate, magnesium hydrocarbonate carbonate, barium sulfate, hydroxyapatite, calcium silicate , cerium dioxide and microcapsules of glass or ceramics, silk fibers, cotton fibers, and mixtures thereof.

 The colored particles may further comprise a "soft focus" charge. By "soft-focus" load, we mean a load which in addition gives transparency to the complexion and a fuzzy effect.

 Preferably, the "soft-focus" charges have an average particle size of less than or equal to 15 microns. These particles can be of any shape and in particular be spherical or nonspherical. More preferably, these fillers are nonspherical.

The "soft-focus" fillers may be chosen from silica and silicate powders, in particular alumina powders, polymethyl methacrylate (PMMA) powders, talc, silica / TiO ₂ or silica / zinc oxide composites, polyethylene powders, starch powders, polyamide powders, styrene / acrylic copolymer powders, silicone elastomers, and mixtures thereof.

In particular, mention may be made of talc with a mean size of less than or equal to 3 microns, for example talc of average size in number of 1.8 micron and in particular that sold under the trade name Talc P3® by the company Nippon Talc , Nylon® 12 powder, in particular that sold under the name Orgasol 2002 Extra D Nat Cos® by the company Atochem, silica particles treated on the surface with a mineral wax 1 to 2% (INCI name: hydrated silica (and) paraffin) such as those sold by the company Degussa, amorphous silica microspheres, such as those sold under the name Sunsphere, for example reference H-53® by Asahi Glass, silica micro-beads such as those sold under the name SB- 700® or SB-150® by Miyoshi, Sensibead Si 175 and Sensibead Si 320 silica balls from Sensient Cosmetic Technologies, and Senselier's PMMA Covabead Velvet 10 and Covabead Velvet 20 beads, this list not being exhaustive .

 The concentration of these fillers having an effect on the signs of aging in the colored particles may be between 0.1% and 60%, or even between 0.5% and 40%, in particular between 1% and 20%, by weight. relative to the total weight of the colored particles.

 According to one embodiment, a colored particle according to the invention further comprises at least one coloring agent different from the above-mentioned pigment (s).

 The colored particles may therefore also comprise a dye and / or a mother-of-pearl, for example a 2375 Gold Covapearl Star nacre by Sensient Cosmetic Technologies or Covapearl Antique Silver 239 from Sensient Cosmetic Technologies. Preferably, a dye or a mother-of-pearl of a different color from that of the pigment used will be chosen. By "dye" is meant a coloring chemical substance soluble in the colored particle (or the phase of the colored particle in which the dye is present). By "soluble" is meant that the solubility at 20 ° C of the dye in the colored particle is greater than 2 g / l, especially greater than 5 g / l, preferably greater than 10 g / l.

 Preferably, when the colored particles are multiphase, the phase comprising the pigment (s) is different from that comprising the nacre (s) or the dye (s). This results in an exacerbated visual effect, even unexpected, for the consumer who, according to a particular embodiment, sees out of the container a cosmetic composition of a color (that of (s) nacre (s) and / or dye (s) ) totally different from that expected (that of the pigment of the colored particles).

 According to one embodiment, when the particle according to the invention is a single capsule as defined above, the core comprises at least 3%, in particular at least 5%, by weight of pigments, and the membrane comprises at least a coloring agent, in particular nacres, of a different color of the encapsulated pigments (and therefore of the core), preferably in a content such that the membrane (or envelope) prevents the contents of the capsule from being seen. This results in an unexpected effect for the consumer who sees a package of a color completely different from the color of the capsules coming out of the pack.

According to one embodiment, when the particle according to the invention is a complex capsule as defined above, the core comprises at least 3%, in at least 5%, by weight of pigments, and, according to a first variant, the pigments are present in the inner phase (IF), the intermediate phase (MF), or both, and according to a second variant, the membrane comprises at least one coloring agent, in particular nacres, preferably of a different color of the encapsulated pigments (and therefore of the core), preferably in a content such that the membrane (or envelope) prevents the content of the capsule from being seen. This results in unexpected visual effects for the consumer who sees the pack out of a composition of a color totally different from the color of the capsules.

 The particles according to the invention may further comprise at least one additional compound different from the abovementioned compounds.

 A particle according to the invention, in particular the core and / or the envelope of a capsule according to the invention, can thus additionally comprise, as additional compound, powders, flakes, particulate agents insoluble in the fatty phase. , emulsifying and / or non-emulsifying silicone elastomers, especially as described in application EP 2 353 577, preservatives, humectants, stabilizers, chelators, emollients, modifying agents chosen from pH, osmotic force and / or refractive index modifiers etc .. or any usual cosmetic additive, and mixtures thereof.

 A particle according to the invention, in particular the core and / or the envelope of a capsule according to the invention, may furthermore comprise at least one active agent, in particular a biological or a cosmetic active agent, preferably chosen from hydrating agents, healing agents, depigmenting agents, UV filters, desquamating agents, antioxidants, active agents stimulating the synthesis of dermal and / or epidermal macromoleculars, dermodecontracting agents, antiperspirants, soothing agents, anti-inflammatory agents, age, perfuming agents and their mixtures. Such assets are described in particular in application FR 1 558 849.

 Of course, those skilled in the art will take care to choose any additional compound (s) and / or active (s) mentioned above and / or their respective amounts so that the advantageous properties of the particles according to the invention are not not or substantially unaffected by the proposed addition. These adjustments are within the skill of the skilled person.

The invention also relates to a process for preparing a series of colored particles comprising a step c) of formulating at least one pigment in the form of a series of colored particles comprising at least 3% by weight of pigment.

 According to a first alternative of the method, the pigment used in step c) is an untreated and unmilled pigment (pigment used "as is").

 According to a second alternative of the process, the pigment used in step c) has been pre-treated in order to make it more easily dispersible during the formulation of the pigment. This pretreatment consists in grinding the pigment and / or in pretreating it with an additive improving its dispersibility before formulating it in the form of a series of colored particles.

 The preparation process then comprises the steps of:

 a) providing at least one pigment optionally pretreated with an additive improving the dispersibility of the pigment, then

 b) optionally grinding said at least one pigment, said grinding preferably taking place when the at least one pigment is not pretreated,

 c) formulating the at least one pigment obtained in step a) or b) in the form of a series of colored particles comprising at least 3% by weight of pigment (s).

 The invention is based in particular on the discovery that the use of a ground pigment and / or a pigment pretreated with an additive improving its dispersibility:

 contributes to a liquid which contains the ground and / or pretreated pigment having a low viscosity,

 contributes to the preparation of colored particles having a content of very high pigment (s), comprising more than 3% by weight of pigment (s), generally more than 5% by weight of pigment (s), or even more than 7%, 5% by weight of pigment (s),

 - contributes to the decrease or even avoid the sedimentation of the pigment (s) in the phase (s) of the colored particles which contain it (s), and / or

 - contributes to the decrease, or even avoid, the aggregation of the pigments in the phase (s) of the colored particles which contain it (s).

 Generally, when several pigments are used, they all undergo the same treatment, that is to say they are all ground and / or they are all pretreated. It is possible, however, that some are crushed and untreated, and others treated and crushed or unmilled.

According to a first embodiment of the method according to the second alternative, the at least one pigment of step a) is pretreated with an additive improving the dispersibility of the pigment. The nature of the additive improving the dispersibility of the pigment depends on the hydrophilic or lipophilic nature of the phase (s) of the colored particle which will include (have) this treated pigment.

 When the process uses a plurality of pretreated pigments, these may be pretreated with additives that are identical or different from one another.

 An additive improving the dispersibility of the pigment within an oily composition is chosen to prepare colored particles whose (s) phase (s) which will include (have) the pigment is oily. The additive is for example chosen from hydrogenated lecithin, a silicone, a wax, an amino acid or a salt thereof and an amino acid ester or a salt thereof. Hydrogenated lecithin comprises phosphate mono- and di-ester having fatty chains which promote dispersibility in the oily phase. The silicone additive may be either obtained from a silicone precursor, such as an alkoxyalkylsilane such as triethoxycaprylsilane, or such as a trialkylsiloxysilicate such as trimethylsiloxysilicate, or be a silicone, such as dimethicone or a derivative thereof , for example bis-hydroxyethoxypropyl dimethicone, or be obtained from a mixture of silicone and one of its precursors, for example a dimethicone and trimethylsiloxysilicate mixture. The silicone additive may be a hybrid treatment, particularly a mixture of isopropyl titanium triisostearate, bis-hydroxyethoxypropyl dimethicone, PEG-2 soyamine and isophorone diisocyanate (IPDI). The wax may for example be pink floral wax. The preferred amino acid is cystine, and the preferred amino acid esters are sodium cocoyl glutamate, layroyl arginine or lauroyl lysine.

An additive improving the dispersibility of the pigment within an aqueous composition is selected to prepare colored particles whose phase (s) which will include (have) the pigment is aqueous. This additive is in particular of formula (I) below:

in which :

 n represents 1 or 2,

 M represents H or a cation,

 m is 1 when M is H and m is the valence of the cation when M is a cation,

- R represents: a group G chosen from a saccharide or a group or - [CH ₂ -CH (CH ₂ OH) -O] _q -R ₂ where:

 q represents an integer of 1 to 1000,

for each CH ₂ -CHRrO unit, R 1 independently represents H or a methyl,

R ₂ represents H or an alkyl comprising from 1 to 3 carbon atoms, and

a hydrocarbon chain comprising from 1 to 500 carbon atoms substituted with one or more G groups, phosphate (of formula OPO ₃ (M) _{2 / m} ) and / or hydroxyl (OH).

The group - [CH ₂ -CHR O] _q -R ₂ with R 1 represents H is a polyethylene glycol (PEG). The group - [CH ₂ -CHR O] _q -R ₂ with R 1 represents a methyl corresponds to a polypropylene glycol (PPG). The group [CH ₂ -CH (CH ₂ OH) -O] _q -R 'corresponds to a polyglycerol.

 Typically, q is an integer from 1 to 500, especially from 1 to 100, preferably from 1 to 60.

 Preferably, n represents 2 and the additive has the following formula (Γ):

 O I I

 (M) O-P-OR

 1 / m |

 O (M)

1 / m _(r)>

wherein M, m and R are as defined above.

 For the purposes of the present application, a hydrocarbon chain comprises from 1 to 500 carbon atoms, especially from 1 to 50, typically from 1 to 10 carbon atoms, preferably from 1 to 5 carbon atoms. The hydrocarbon chains can be linear, branched or cyclic. The preferred hydrocarbon chains are alkyl groups (preferably having 1 to 10 carbon atoms, especially 1 to 5 carbon atoms, preferably 1 to 3, such as methyl, ethyl, n-propyl and isopropyl groups) alkenyl (preferably having 2 to 10 carbon atoms, especially 2 to 6), aryl (preferably 6 to 10 carbon atoms), arylalkyl (preferably 7 to 10 carbon atoms), or alkylaryl (preferably having 7 to 10 carbon atoms). The vinyl group is the preferred alkenyl group. The phenyl group is the preferred aryl.

A saccharide may be a mono- or polysaccharide. Preferred saccharides are mono- or disaccharide, especially monosaccharides such as glucose, galactose or fructose. M may especially be an inorganic cation, such as Ag ³⁺ , Al ³⁺ , Fe ³⁺ , Fe ²⁺ , Ag ²⁺ , Zn ²⁺ , Sn ²⁺ , Ca ²⁺ , Ba ²⁺ , Ag ⁺ , Na ⁺ or an organic cation, such as a diethanolammonium (DEA) (H ₃ N ⁺ - (CH ₂ ) ₂ -OI-1) or a quaternary ammonium.

The following additives of formula (II), (III) or (IV) are particularly suitable for the implementation of the invention:

HO- (CH ₂ CH ₂ -O) - ChL O (M)

^{2 2} q I ² I 1 / m

HO- (CH ₂ CH ₂ -O) - C-O-P = 0

 d q | |

HO- (CH ₂ CH ₂ -O) - CH ₂ O (M)

q ^m (ll),

 in which M, m and q are as defined above,

(which corresponds to an additive of formula (I) in which n represents 2 and R represents an isopropyl hydrocarbon chain each of whose carbon atoms is substituted by a group G which represents - [CH CHR OJ _q -Rg where R 1 and

R ₂ represent H),

O (M)

 I 1 / m

 HO-CH-CH-CH-O-P = 0

2 I ² I

 OH O (M)

^{1 / m} (III),

 in which M and m are as defined above,

(which corresponds to an additive of formula (I) in which n represents 2, R represents a group G of formula - [CH ₂ -CH (CH ₂ OH) -O] _q -R ₂ where q represents 1 and R ₂ represents H),

 in which M and m are as defined above and q 'and q "independently represent an integer from 0 to 1000, generally from 0 to 500, especially from 0 to 100, preferably from 0 to 60, such that sum of q 'and q "independently represent an integer from 1 to 1000,

(which corresponds to an additive of formula (I) in which n represents 2, R represents a group G of formula - [Ch CHR OJ _q -Rg where q represents the sum and for the first units, R 1 is methyl and for the last 4 units R 1 is H and R ₂ is H).

The following additives of formula (V) and (VI) are also suitable:

(which corresponds to an additive of formula (I) in which n represents 2, R represents a cyclohexyl hydrocarbon chain substituted at the 2, 3, 4, 5 and 6 positions with a phosphate group of formula OPO ₃ H ₂ ),

 (which corresponds to an additive of formula (I) in which n represents 2, R represents a methyl hydrocarbon chain linked to a G group glucose), in which M and m are as defined above.

 The following additives are particularly preferred:

 glycereth-26 phosphate, of formula (ΙΓ) below:

HO- (CH ₂ CH ₂ -0) - CHL OH

HO- (CH ₂ CH ₂ -O) -O-OP = O

HO- (CH ₂ CH ₂ -O) 2-6 CH 2 ₉ OH _{(| |} , _);

(which corresponds to an additive of formula (II) wherein M is H and m is 1), said additive being preferably commercially available, eg from Croda ^®, the glycerophosphate, of formula (I II ') below:

 We have

 I

HO-CH CH-CH O-P = O

 OH ONa

(which corresponds to an additive of formula (III) wherein M represents Na and m represents 1), said additive being preferably commercially available, for example from Dr. Paul Lohman ^®,

 the diethylammonium phosphate PEG-26 PPG-30 of formula (IV) below:

HO- (-CH CH-O

(which corresponds to an additive of formula (IV) wherein M represents a cation and m represents diethanolammonium 1), said additive being preferably commercially available, for example from Innospec ^®,

 the phytic acid of formula (V) below:

(which corresponds to an additive of formula (V) wherein M is H and m is 1), said additive being preferably commercially available, for example from NutriScience ^®,

 glucose phosphate, of formula (VI ') below:

(which corresponds to an additive of formula (VI) in which M represents H and m represents 1), this additive being advantageously available commercially. Phytic acid is the additive improving the dispersibility of the pigment in a preferred aqueous composition.

 The method may comprise, before step a), a step aO) of mixing a pigment with an additive as defined above to obtain a pretreated pigment. For example, the preparation method described in the application WO 2012/120098 can be used.

 In this first embodiment of the method according to the second alternative implementing a pretreated pigment, the method may comprise a step b) of grinding the pretreated pigment or be free from it. This grinding makes it possible to limit or even eliminate the pretreated pigment aggregates, which facilitates their subsequent incorporation into the phase (s) of the colored particles and / or contributes to reducing the sedimentation of the pigment in the (es) phase (s) of the colored particles which contain it.

 This grinding step may be carried out in the presence of a binder, or in the absence of binder (dry grinding).

 The binder is, for example, glycerine, propanediol, a hydrogenated starch hydrolyzate, octyldodecanol, castor oil, a mineral oil, isononyl isononanoate, dimethicone and cyclomethicone, isododecane. Preferably, when the pigment is not pretreated or when it is treated with an additive improving its dispersibility in an aqueous composition, the binder is chosen from propanediol, glycerin and a hydrogenated starch hydrolyzate. Preferably, when the pigment is treated with an additive improving its dispersibility within an oily composition, the binder is chosen from glycerol, octyldodecanol, castor oil, a mineral oil, isononyl isononanoate, dimethicone and cyclomethicone, isododecane.

 The mill is then typically selected from three-roll mills, ball mills and plate mills.

 When the milling step is carried out in the absence of binder, the mill may be a pin mill, a jet micronizer, an impact mill, a hammer mill, a knife mill, a ball mill , a vibrating mill or a cryogenic mill.

According to a second embodiment of the method according to the second alternative, the at least one pigment of step a) is not pretreated with an additive improving its dispersibility, and the process then comprises a step b) of grinding the pigment. This grinding makes it possible to limit or even eliminate the pretreated pigment aggregates, which facilitates their subsequent incorporation into the phase (s). colored particles and / or helps to reduce the sedimentation of the pigment in the phase (s) of the colored particles which contain it.

 The embodiments described above for grinding are of course applicable (type of mill, absence or presence of binder).

Whatever the alternative and the embodiment of the process in question, it comprises a step c) of formulating at least one pigment, in the form of a series of colored particles comprising at least 3% by weight of pigment ( s).

 Preferably, the pigment is that obtained in step a) or b). A liquid comprising a pigment ground and / or pretreated as defined above indeed has a lower viscosity than a liquid comprising uncrushed and unprocessed pigment. A liquid comprising a ground and / or pretreated pigment can therefore be formulated much more easily in the form of a series of colored particles. In addition, the phase that contains the pigment will be less prone to sedimentation of the pigment.

 Generally, the colored particles formulated in step c) comprise all or part of at least one polysaccharide, and in particular at least one partially or totally gelled polyelectrolyte.

In a first embodiment, the formulation of step c) implements a liquid solution that comprises both the pigment (s), preferably obtained in step a) or b), and

 - a polyelectrolyte,

 or a solution containing a reagent capable of reacting with a polyelectrolyte. Typically, step c) according to this first embodiment comprises the following substeps:

 C1 a) mixing the at least one pigment, preferably obtained in step a) or b), with a liquid solution containing at least one liquid polyelectrolyte suitable for gelling,

 C1 b) introducing dropwise the mixture obtained in step C1 a) in a solution containing a reagent suitable for reacting with the polyelectrolyte to pass at least partially from a liquid state to a gelled state;

C1 c) recovery of the colored particles formed. or else step c) comprises the following substeps:

 C2a) mixing the at least one pigment, preferably obtained in step a) or b), with a solution containing a reagent suitable for reacting with a polyelectrolyte,

C2b) introducing the mixture obtained in step C2a) dropwise into a liquid solution containing a liquid polyelectrolyte suitable for gelling, whereby the polyelectrolyte (in the immediate vicinity of the drops of mixture obtained in step C2a) goes to less partially from a liquid state to a gelled state;

 C2c) recovery of the colored particles formed.

 The polyelectrolyte is preferably a polyelectrolyte reactive with multivalent ions, especially a polysaccharide reactive with multivalent ions such as an alkali alginate, a gelatin, a pectin, a cellulose or a cellulose derivative, such as carboxymethylcellulose, or of agar. Preferably, it is an alkaline alginate, such as sodium alginate.

 The reagent capable of reacting with the polyelectrolyte to change it from a liquid state to a gelled state is typically a solution comprising multivalent ions such as alkaline earth metal ions selected for example from calcium ions, ions barium, magnesium ions.

 When the liquid solution used in step C1 a) or C2a) is oily, the pigment used in step a) is preferably an unprocessed pigment or a pigment pretreated with an additive improving its dispersibility within a composition oily.

 When the liquid solution used in step C1 a) or C2a) is aqueous, the pigment used in step a) is preferably an unprocessed pigment or a pigment pretreated with an additive improving its dispersibility within a composition aqueous.

 The mixture obtained in stage C1 a) or C1 b) preferably comprises more than 10% by weight, especially more than 15% by weight, for example between 20 and 50% by weight of pigment (s) (cumulative contents when there are several pigments). Such proportions are indeed adapted so that the mass proportion of pigment (s) colored particles obtained at the end of the process is greater than 3% by weight, preferably greater than 5% by weight.

 The solution used in step C2a) may further comprise at least one thickening agent, for example a polysaccharide such as xanthan.

In step C1 b), the drops are immersed in the solution containing a reagent suitable for reacting with the polyelectrolyte. In step C2b), the drops are immersed in the polyelectrolyte solution. Adaptation of the duration of step C1 b) or C2b) makes it possible to obtain partially or totally gelled particles. When all the polyelectrolyte gels, the colored particles formed are "solid particles", also called monophasic particles. When the polyelectrolyte passes only partially from a liquid state to a gelled state, the colored particles comprise a gelled envelope completely encapsulating the liquid core. This adaptation of the duration of step C1 b) or C2b) is a general knowledge of the skilled person.

In a second embodiment, the formulation of step c) implements two distinct liquid solutions, one which comprises the pigment, preferably obtained in step a) or b), and the other which comprises a polyelectrolyte. The colored particles comprise a core and a casing completely encapsulating the heart. Generally, the at least one pigment is in the phase (one of the phases) forming the core. Advantageously, the pigment (s) do not migrate into the envelope, which allows it to not disintegrate out of the particles.

 The colored particles may comprise a liquid or at least partially gelled or at least partially thixotropic heart containing the pigment (s), preferably obtained in step a) or b), and a gelled envelope completely encapsulating the heart. This liquid heart or at least partly gelled or at least partially thixotropic may be based on a predominantly oily phase. In this case, if a pretreated pigment has been used in the process, it is a pretreated pigment with an additive improving the dispersibility of the pigment within an oily composition. This heart may be based on a predominantly aqueous phase. In this case, if a pretreated pigment has been used in the process, it is a pretreated pigment with an additive improving the dispersibility of the pigment in an aqueous composition.

 When the colored particles comprise a core containing the pigment (s), preferably obtained in step a) or b), and a gelled envelope completely encapsulating the core, step c) typically comprises the following substeps:

 C3a) separate conveying in a double jacket of a first liquid solution containing the pigment (s), preferably obtained in step a) or b), and a second liquid solution containing at least a liquid polyelectrolyte suitable for gelling;

C3b) formation, at the exit of the double envelope, of a series of drops, each drop comprising a central core formed of the first liquid solution, and a peripheral film formed of a second solution and completely covering the central core, wherein the second solution (40) contains at least one surfactant prior to contact with the first solution;

 C3c) detachment of each liquid body away from the jacket and drop of each liquid body into a volume of air;

 C3d) immersing each drop in a solution containing a reagent capable of reacting with the polyelectrolyte of the film to change it from a liquid state to a gelled state and form the gelled envelope, the central core forming the core; and

 C3e) recovery of the colored particles formed.

 Preferably, the first liquid solution is an aqueous composition comprising, or even consisting of, the pigment (s), preferably obtained in step a) or b), optionally a binder, especially as defined above, at least one preservative and at least one polymer, especially chosen from hyaluronic acid or a salt thereof, carrageenan, gellan, a polysiloxane, and mixtures thereof.

 The first liquid solution preferably comprises more than 10% by weight, in particular more than 20% by weight, for example between 25 and 50% by weight of pigment (s) (cumulated content when there are several pigments). Such proportions are indeed adapted so that the mass proportion of pigment (s) colored particles obtained at the end of the process is greater than 3% by weight, preferably greater than 5% by weight.

 The surfactant is especially chosen from an anionic surfactant, a cationic surfactant, a nonionic surfactant or mixtures thereof. Preferably, it is chosen from an alkyl sulphate, an alkyl sulphonate, an alkyl aryl sulphonate, an alkaline alkyl phosphate, a dialkyl sulphosuccinate, an alkaline earth salt of saturated or unsaturated fatty acids, an alkylpyridium halide salt or alkylammonium such as n-ethyldodecylammonium chloride or bromide, cetylammonium chloride or bromide, polyoxyethylenated and / or polyoxypropylenated derivatives of fatty alcohols, fatty acids or alkylphenols, or from arylphenols, alkyl glucosides, polysorbates, cocamides or mixtures thereof. Preferably, it is sodium dodecyl sulfate.

The or each electrolyte and the reagent suitable for reacting with the polyelectrolyte are preferably as defined above. The second liquid solution containing a liquid polyelectrolyte suitable for gelation may also contain a mother-of-pearl and / or a dye, preferably of a color different from that of the pigment of the first liquid solution.

 For example, according to this second embodiment, the formulation of step c) can be implemented by following the method described in WO 2010/063937.

The core of the colored particles may comprise an intermediate drop of an intermediate phase, the intermediate phase being placed in contact with the envelope, and at least one, preferably a single, internal drop of an internal phase disposed in the intermediate droplet. . Step c) then typically comprises the following substeps:

 C4a) separated conveying in a triple envelope of an internal phase intended to form the internal drop (s) of the core, of an intermediate phase intended to form the intermediate drop of the core, and of a first solution containing a polyelectrolyte clean liquid to be gelled for forming the gelled shell, said first solution preferably containing a surfactant;

 C4b) formation at the exit of the triple envelope of a series of liquid bodies, each liquid body comprising at least one, preferably a single internal internal phase drop disposed in an intermediate phase intermediate drop, said intermediate drop being coated a peripheral film formed of first solution;

 C4c) detachment of each liquid body away from the triple envelope and fall of each liquid body into a volume of air;

 C4d) immersing each liquid body in a solution containing a reagent capable of reacting with the polyelectrolyte of the film to change it from a liquid state to a gelled state and form the gelled envelope;

 C4e) recovery of the colored particles formed, preferably with a ratio of the volume of the core to the volume of the envelope greater than 2, advantageously less than 50,

 where the inner phase and / or the intermediate phase contains the pigment (s), preferably obtained in step a) or b). Preferably, the internal phase is that which contains the pigment (s). Preferably, the intermediate phase is that which contains the pigment (s).

The polyelectrolyte, the surfactant and the reagent are preferably as defined above. The first solution containing a clean liquid polyelectrolyte to be gelled for forming the gelled envelope may further comprise a mother-of-pearl (nacres) and / or at least one dye, preferably of a color different from that of the pigment contained in the phase. internal and / or intermediate phase.

 Generally one of the phases of the inner phase and the intermediate phase is aqueous and the other is oily. For example, the intermediate phase is an aqueous composition comprising, or even consisting of, the pigment (s), optionally a binder, especially as defined above, at least one preservative and at least one polymer, in particular chosen from hyaluronic acid or a salt thereof, carrageenan, gellan, a polysiloxane, and mixtures thereof, and the inner phase is a vegetable oil such as almond, apricot or jojoba oil.

 The intermediate phase preferably comprises more than 10% by weight, in particular more than 20% by weight, for example between 25 and 50% by weight of pigment (contents cumulated when there are several pigments). Such proportions are indeed adapted so that the mass proportion of pigment colored particles obtained at the end of the process is greater than 3% by weight.

 For example, the formulation of step c) can be implemented by following the method described in WO 2012/089820.

A solution comprising a ground and / or pretreated pigment as defined above has a lower viscosity than a solution comprising unmilled and unprocessed pigment. Generally, the viscosity:

 the mixture obtained in stage C1 a),

 the mixture obtained in stage C2a),

 the first liquid solution of step C3a),

 the internal phase containing the pigment (s) of step C4a) and / or the intermediate phase containing the pigment (s) of step C4b),

 is from 1 mPa.s to 500,000 mPa.s, preferably from 10 mPa.s to 300,000 mPa.s, more preferably from 400 mPa.s to 100,000 mPa.s, and more particularly from 1,000 mPa.s. at 30,000 mPa.s as measured at 25 ° C and at ambient pressure (1,013 mbar). The viscosity can be measured with a Brookfield Model Viscometer LVDV2T machine at a speed of 10 revolutions per minute.

 These viscosities can be adapted by using a gelling agent, especially as defined above. For example :

the mixture obtained in stage C1 a), the mixture obtained in stage C2a),

 the first liquid solution of step C3a),

 the internal phase containing the pigment (s) of step C4a) and / or the intermediate phase containing the pigment (s) of step C4b),

 comprises a gelling agent, especially as defined above.

Whatever the embodiment used, the method may comprise, after step c), a step d) rinsing the colored particles.

In the case of complex capsules, the process may comprise, after step c), a step e) of depolymerization. This step e) of depolymerization is intended to remove the gelled envelope when comprising at least one gelled polyelectrolyte. This step e) can be carried out by any depolymerization method known to those skilled in the art. In the case of a gelled envelope of alginate, the depolymerization can be carried out by immersion in a depolymerization solution, such as, for example, a solution of sodium citrate concentrated at a mass content of at least 5%, typically of 10%. It is also possible to mention tartrate ion, phytic acid or EDTA solutions, any solution of so-called chelating species for divalent cations, or solutions of acrylic acid polymers such as carbomer, carbopol, polyacrylamide or polyacrylate type. .

 Preferably, the intermediate phase (or envelope) is not altered by the depolymerization step e).

Advantageously, the method according to the invention does not include a step of drying the particles.

The invention also relates to a series of colored particles that can be obtained by the above process, said particles comprising at least 3% by weight, preferably at least 5% by weight, in particular at least 10% by weight, in particular at least 13% by weight of pigment (s).

The invention also relates to the use of at least one series of colored particles for introduction into a cosmetic composition.

The particles or series of particles according to the invention can in particular be used in the cosmetics field. The invention also relates to a cosmetic composition, preferably a makeup composition comprising at least one series of colored particles.

 The cosmetic compositions according to the invention may comprise, in addition to the aforementioned ingredients, at least one physiologically acceptable medium.

 The invention therefore also relates to a composition comprising at least one particle as defined above or at least one series of particles as defined above, in association with an acceptable physiological medium.

 By "physiologically acceptable medium" is meant a medium which is particularly suitable for the application of a composition of the invention to keratin materials, in particular the skin, the lips, the nails, the eyelashes or the eyebrows, and preferably the skin.

 The physiologically acceptable medium is generally adapted to the nature of the medium to which the composition is to be applied, as well as to the appearance under which the composition is to be packaged.

 The presence of a physiologically acceptable medium can contribute to improving the conservation and / or preserving the integrity over time of the colored particles according to the invention.

 According to one embodiment, the physiologically acceptable medium is in the form of an aqueous gel, the viscosity of which is adapted to ensure the suspension of the colored particles according to the invention.

 According to one embodiment, the cosmetic compositions are used for the makeup and / or care of keratin materials, especially the skin.

 The cosmetic compositions according to the invention may be skincare, sun protection, cleaning (makeup removal), hygiene or make-up products for the skin.

 These compositions are therefore intended to be applied especially to the skin, lips or hair.

 Thus, the present invention also relates to the non-therapeutic cosmetic use of a cosmetic composition mentioned above, as a makeup, hygiene, cleaning and / or care product for keratinous substances, in particular the skin.

According to one embodiment, the compositions of the invention are in the form of a foundation, a makeup remover, a facial and / or body and / or hair care, anti age, a sun protection, a oily skin care, a whitening care, a moisturizer, a BB cream, tinted cream or foundation, a facial and / or body cleanser, a shower gel or a shampoo.

 A care composition according to the invention can be in particular a solar composition, a care cream, a serum or a deodorant.

 The compositions according to the invention may be in various forms, in particular in the form of cream, balm, lotion, serum, gel, gel-cream or mist.

 In particular, a composition according to the invention is a care and / or makeup composition for keratinous substances, in particular the skin, and is in particular a foundation composition.

 In view of the foregoing, a composition according to the invention and in particular the particles according to the invention do not concern, and are therefore different from, "two-way cakes" or else cosmetic compositions in the form of powders, such as described in EP 1 036 555.

 The present invention also relates to a non-therapeutic method for cosmetic treatment of a keratinous material, in particular of the skin, lips or hair, comprising at least one step of applying to said keratin material at least one composition according to the invention. 'invention.

 In particular, the present invention relates to a non-therapeutic method for cosmetic treatment of the skin, lips or hair, comprising a step of applying to the skin at least one composition according to the invention.

The cosmetic composition preferably comprises at least 3% by weight of pigment (s), in particular at least 5%, for example at least 7.5% by weight of pigment (s). The maximum mass proportion of pigment (s) in the composition is generally 50% or even 30%.

 The coloration conferred by the colored particles may for example be measured by spectrocolorimetry and / or spectrophotocolorimetry.

More particularly, the cosmetic composition may for example be mascara, a product for the complexion, such as a foundation, a liner ("eyeliner" in English), an eyeshadow or cheek, a product for the lips as a lipstick or a lip gloss ("lip-gloss" in English), possibly liquid soap, shampoo, conditioner, nail polish, preferably eye shadow, complexion products or lip products. The cosmetic composition may be in the form of a lotion monophasic or biphasic, emulsion water in oil or oil in water, gel, stick or cream.

 The makeup composition preferably has a coverage greater than or equal to 10, in particular greater than or equal to 15, even preferably greater than or equal to 40, preferably greater than or equal to about 45, in particular greater than or equal to about 50, especially greater than equal to about 60, more particularly greater than or equal to about 80, in particular ranging from 90 to 100, or even about 100. Coverage corresponds to the ability of the makeup composition to "mask the skin" / to "hide the imperfections ".

The coverage of the compositions is measured at a finite thickness of 50 μηι for liquid compositions at 25 ° C. to be applied to the lips, in particular liquid lipsticks, liquid lip glosses and liquid lip balms, and at a thickness of 150 μηι for eye shadows, liquid foundations, mascaras and other liquid make-up products not intended to be applied to the lips. The composition is spread on matt black and matt white contrast cards, for example LENETA Form WPI for the matte black card and Leneta IA for the matte white card. The application can be performed with an automatic spreader. The measurements are carried out on the compositions thus spread. Reflectance spectra are acquired using a MINOLTA 3700-d spectrocolorimeter (diffuse measurement geometry and observation D65 / 10 ⁰ , specular component excluded mode, small aperture (CREISS)) on the black and white backgrounds. The spectra are expressed in colorimetric coordinates in the CIELab76 space within the meaning of the International Commission on Illumination according to Recommendation 15: 2004. The contrast ratio, or coverage, is calculated by averaging Y on a black background, divided by the average value of Y on a white background, multiplied by 100.

The expressions "between ... and ...", "from ... to ..." and "from ... to ..." must be understood as inclusive, unless otherwise specified.

The examples below illustrate the invention without limiting its scope. EXAMPLE 1 Influence of the Treatment of a Pigment by an Additive Improving its Dispersibility and Crushing on the Quality of the Pigment Dispersion

Various pigment dispersions (white, black, yellow and red pigments) in glycerine were prepared with compositions shown in Table 1. The additive used to improve the dispersibility of the pigments in the aqueous phase is phytic acid.

Preparation of a dispersion 1 of treated and unmilled pigments

A dispersion of white, black, yellow and red pigments treated with surface phytic acid in glycerin was prepared with a weight ratio of 1: 1 pigments / glycerin according to the compositions shown in Table 1.

 Table 1: Composition of the pigment dispersion comprising treated pigments

While stirring with the helix (Ika), the pigments were incorporated into the glycerine. Stirring was maintained for 30 minutes at 600 rpm.

 The pigment dispersion obtained was smooth, shiny, fluid. Its viscosity at 25 ° C was 7.32 Pa.s at a speed of 10 revolutions per minute and at module 4, for 30s, torque 12.2.

The dispersion was placed between two glass plates. Points were then visible. The color develops between the glass plate. • Preparation of a dispersion 2 of treated and milled pigments

The composition of the pigment dispersion is also that of Table 1.

The following protocol was followed: In a beaker, with stirring at the propeller at 600 rpm for 30 min, the treated pigments were gradually incorporated into the glycerine. The mixture was then milled on a three-roll mill (EXAKT 50i) with three consecutive passes through the mill. This grinding corresponds to step b) defined in the application.

 The pigment dispersion obtained was smooth, shiny, fluid. Its viscosity at 25 ° C was 5.46 Pa.s at a speed of 10 revolutions per minute and at module 4, for 30s, torque 2.9.

 It was placed between two glass plates and appeared homogeneous, without clumps / pigment agglomerate / color dots. The color has remained stable.

• Preparation of a dispersion 3 of untreated untreated pigments

A dispersion of untreated white, black, yellow and red pigments in glycerine was prepared with a weight ratio of 1: 1 pigments / glycerin according to the compositions shown in Table 2.

 treated

While stirring with the helix (Ika), the pigments were incorporated into the glycerine. Stirring was maintained for 30 minutes at 600 rpm. The pigment dispersion obtained was smooth, glossy, thick. Its viscosity at 25 ° C. at a speed of 10 revolutions per minute and at module 4 for 30 seconds was too great to be measured with the aforementioned device. She was placed between two glass plates. White, black and red dots were observed. The color develops between the glass plate.

• Preparation of a dispersion 4 of untreated and crushed pigments

The composition of the pigment dispersion is also that of Table 2.

The following protocol was followed: In a beaker, with stirring at the propeller at 600 rpm for 30 min, the untreated pigments were gradually incorporated into the glycerine. The mixture was then milled on a three-roll mill (EXAKT 50i) with three consecutive passes through the mill. This grinding corresponds to step b) defined in the application.

 The viscosity of the dispersion obtained at 25 ° C. at a speed of 10 revolutions per minute and at module 4 for 30 seconds was too great to be measured with the aforementioned device.

Viscosity of the dispersions and size distributions of the pigment particles are provided in Table 3 below.

 Table 3: Viscosities of dispersions and particle size distributions of pigments

 The particle size was measured by laser diffraction using a HORIBA Model LA-960S granulometer.

These examples show that the treatment of the pigment with phytic acid and grinding makes it possible to thin the pigment dispersion and to improve the dispersion of the pigment in the dispersion. The most satisfactory dispersion is that obtained from treated phytic acid and ground pigments. The higher the quality of the dispersion, the more particles prepared from the dispersion can have a high pigment content.

Example 2 Preparation of Colored Particles Comprising a Liquid Heart and a Gelled Alginate-Based Envelope

White, yellow, black and red pigments pretreated with phytic acid were used to prepare color particles with high pigment content.

• Preparation of a pigment dispersion

A dispersion of white, black, yellow and red pigments treated with surface phytic acid in glycerine was prepared with a weight ratio of 1: 1 pigments / glycerin according to the compositions shown in Table 1 of the present invention. example 1.

 The composition of the pigment dispersion is also that of said table

1.

 The following protocol was followed: In a beaker, with stirring at the helix at 500 rpm for 1 min, the treated pigments were gradually incorporated into 30 g of glycerine. The mixture was very viscous.

 It was then crushed using a three-roll mill (EXAKT 50i) with three consecutive passes through the mill. This grinding corresponds to step b) defined in the application. The mill was then cleaned with the remaining 20 g of glycerin to obtain the glycerin-treated pigments. The particle size measured by laser diffraction using a HORIBA Model LA-960S particle size analyzer was D10: 0.42 - D50: 1 .49 - D90: 0.68.

 The pigment dispersion obtained was smooth, glossy, very viscous. Its viscosity at 25 ° C was 5.46 Pa.s at a speed of 10 revolutions per minute and at module 4, for 30s, torque 13.3.

Colored particles were then formulated using a millifluidic process similar to that described in the application WO 2010/063937, especially from a solution comprising glycerin (used as a binder during grinding), the pretreated pigments. milled obtained above, preservatives and a hyaluronic acid gel. • Preparation of a hyaluronic acid gel

A hyaluronic acid gel having the composition specified in Table 4 was prepared.

 Table 4: Composition of the hyaluronic acid gel

The following protocol was followed: In a beaker were mixed distilled water and preservatives. The hyaluronic acid was then gradually incorporated into fine rain with stirring with the propeller (Ika Eurostar 60 apparatus). Stirring was maintained until a transparent, homogeneous gel was obtained. Its viscosity at 25 ° C was 2.1 Pa.s at a speed of 10 revolutions per minute and at module 4, for 30s, torque 3.5 measured with a Brookfield model Viscosimeter LVDV2T apparatus.

Incorporation of the pigment dispersion into the hyaluronic acid gel

Table 5: Hyaluronic acid composition comprising the pigment dispersion. • Preparation of colored particles by implementing steps C3a) to

C3e).

 A mixture (= mixture A) of 54% by weight of pigmented hyaluronic acid gel obtained and 46% by weight of unpigmented hyaluronic acid gel having the composition indicated in Table 4, was used as the first liquid solution in the process described in WO 2010/063937.

 The method for preparing capsules is based on (i) a millifluidic process similar to that described in application WO 2010/063937 and thus (ii) on the implementation of the following three solutions:

 the mixture A as the first liquid solution intended to form the core of the particles,

 an aqueous solution containing 3% by weight of sodium alginate as the second liquid solution intended to form the gelled envelope of the particles, and

a third solution representing a calcium bath dedicated to gel the second solution and thus allow the formation of the gelled envelope of the particles.

Composition of the calcium bath

The flows considered at the level of the millifluidic device are:

 Debit

 Solution

 (in ml / h)

 first solution 17.5

second solution 5 According to a particular embodiment, the particles may then be stored / stored in a physiologically acceptable medium, in particular a suspending aqueous gel as described below.

 Table 6: mass proportion of pigment in the colored particles obtained

The colored particles obtained included very large mass proportions of pigments (between 13 and 21% by mass of pigment), which makes them particularly suitable for being introduced into make-up compositions, and especially to make-up foundations. • Preparation of a makeup composition

Makeup compositions comprising 55% by weight of colored particles obtained were prepared.

 Table 7: mass proportion of pigment in prepared make-up compositions

The compositions advantageously have a high content of pigment, which makes them suitable for makeup applications, and especially foundation.

Claims

1. Particle comprising at least 3% by weight of pigment (s), generally at least 5% by weight of pigment (s), in particular at least 10% by weight of pigment (s), typically at least 13% by weight of pigment (s), based on the weight of said particle.

2. Particle according to claim 1, wherein the diameter of said particle is from 0.1 mm to 10 mm, in particular from 0.1 mm to 7 mm, preferably from 0.2 mm to 5 mm, typically from 0 to 10 mm. , 3 mm to 3 mm, in particular from 0.4 mm to 2.5 mm, for example from 0.5 to 2 mm.

3. Particle according to claim 1 or 2, selected from solid particles or particles of the heart / bark type.

4. Particle according to any one of claims 1 to 3, comprising a liquid core or at least partly gelled or at least partly thixotropic and a shell, preferably gelled, completely encapsulating said core, said core being monophasic or having a intermediate drop of an intermediate phase, the intermediate phase being placed in contact with the envelope, and at least one, preferably a single, internal drop of an inner phase disposed in the intermediate drop.

5. Series of particles, in which at least one particle comprises at least 3% by weight of pigment (s), generally at least 5% by weight of pigment (s), in particular at least 10% by weight of pigment (s) typically at least 13% by weight of pigment (s), based on the weight of said particle.

The series of particles according to claim 5, wherein the average particle diameter is from 0.1 mm to 10 mm, especially from 0.1 mm to 7 mm, preferably from 0.2 mm to 5 mm, typically from 0.3 mm to 3 mm, in particular from 0.4 mm to 2.5 mm, for example from 0.5 to 2 mm.

7. A series of particles according to claim 5 or 6, wherein the coefficient of variation of the particle diameters is less than 10%, preferably less than 5%.

A series of particles as claimed in any one of claims 5 to 7, wherein said particles are solid particles or core / shell particles.

9. A series of particles according to any one of claims 5 to 8, wherein said particles comprise a liquid core or at least partially gelled or at least partially thixotropic and an envelope, preferably gelled, completely encapsulating said heart, said heart being monophasic or having an intermediate drop of an intermediate phase, the intermediate phase being placed in contact with the envelope, and at least one internal drop of an internal phase disposed in the intermediate drop.

10. Series of particles according to any one of claims 5 to 9, wherein said particles further comprise at least one gelling agent, including heat-sensitive.

11. A series of particles as claimed in any one of claims 5 to 10, wherein said particles further comprise at least one blooming filler.

12. Series of particles according to any one of claims 5 to 11, wherein said particles further comprise at least one dye agent different from said pigment (s), including at least one mother-of-pearl.

13. Composition comprising at least one particle according to any one of claims 1 to 4, or comprising a series of particles according to any one of claims 5 to 12.

14. Composition, in particular cosmetic, comprising at least one particle according to any one of claims 1 to 4, or comprising a series of particles according to any one of claims 5 to 12, in association with a physiologically acceptable medium.

15. The composition of claim 13 or 14, said composition being a makeup composition, in particular foundation.

16. Non-therapeutic method for the cosmetic treatment of a keratinous material, in particular a make-up and / or a care product, preferably a make-up product, in particular a skin, lips or hair, comprising at least one application step on said keratinous material of at least one composition according to any one of claims 13 to 15.