A cosmetic treatment method comprising the application of a cosmetic composition comprising at least one zinc salt and the application of a cosmetic composition comprising at least one specific imidazole compound

Abstract

The invention relates to a cosmetic treatment method for keratin fibers, particularly human keratin fibers such as hair, comprising the application of a cosmetic composition A comprising at least one zinc salt and the application of a cosmetic composition B comprising at least one specific imidazole-type compound. The invention also relates to a multi-compartment device comprising at least one first compartment containing said composition A and at least one second compartment containing said composition B.

Description

Title of the invention: A cosmetic treatment method comprising the application of a cosmetic composition comprising at least one zinc salt and the application of a cosmetic composition comprising at least one specific imidazole-type compound

[0001] The invention relates to a cosmetic treatment method for keratin fibers, in particular human keratin fibers such as hair, comprising the application of a cosmetic composition A comprising at least one zinc salt and the application of a cosmetic composition B comprising at least one particular imidazole-type compound.

[0002] The invention also relates to a multi-compartment device comprising at least a first compartment containing said composition A and at least a second compartment containing said composition B.

[0003] External atmospheric agents such as pollution and inclement weather, as well as mechanical or chemical treatments, or certain routines such as brushing, combing, dyeing, bleaching, perming, straightening, and / or repeated washing, can damage and weaken keratin fibers, particularly in their internal structure. The fibers then exhibit mechanical properties inferior to those of natural fibers. The hair then becomes brittle and less resistant to external attacks.

[0004] Thus, to remedy these drawbacks, it is common to use hair care compositions designed to condition the hair by providing satisfactory cosmetic properties, including smoothing, shine, softness, suppleness and lightness, as well as good detangling properties resulting in easier combing and better hair management, making it easier to style and helping it maintain its shape. However, the conditioning effect obtained by these hair care compositions diminishes rapidly over time and does not strengthen the hair cortex.

[0005] Hair coloring is a principle that has been known for a long time, whether for coloring or lightening hair. This allows anyone who wishes to change the color of their hair.

[0006] In the processes of coloring keratin fibers, it is known in particular to color keratin fibers by different techniques from direct dyes for non-permanent colorings or from precursors of oxidation dyes for permanent colorings.

[0007] Non-permanent or direct coloring consists of dyeing the keratin fibers- Unique with dye compositions containing direct dyes. These dyes are colored molecules with an affinity for keratin fibers. They are applied to the keratin fibers for the time necessary to obtain the desired color, then rinsed off.

[0008] Some of these colorants can be used under lightening conditions, which makes it possible to obtain visible colours on dark hair.

[0009] However, the implementation of these dyeing compositions can present a number of drawbacks. Indeed, after application to keratin fibers, the resulting dyeing power may not be entirely satisfactory, or may even be weak, leading to a limited range of colors. The dyes may also not be sufficiently resistant to external agents such as light, shampoos, and perspiration, and may also be too selective, meaning that the color variation is too significant along the same keratin fiber, which is sensitized differently between its tip and its root.

[0010] Thus, there is a real need to make available a cosmetic treatment process for keratin fibers, in particular human keratin fibers such as hair, which prevents breakage of the fibers, or even provides a repairing effect on the fibers and obtains a color that is more resistant to external agents, in particular to shampoos when the process uses one or more coloring agents.

[0011] The present invention therefore relates to a cosmetic treatment process for keratin fibers, in particular human keratin fibers such as hair, comprising the application: (i) of a composition A comprising one or more zinc salts, and ii) of a composition B comprising one or more imidazole-type compounds of general formula (I): in which R1 and R2 independently represent: - a hydrogen atom; - a (Ci-C6)alkyl group possibly substituted by one or more identical or different groups chosen from: -C(O)OR and -NR'R”, with R representing a hydrogen atom or a (Ci-C4)alkyl group and R' and R” independently representing a hydrogen atom or a (Ci-C4)alkyl group; R1 and R2 can form a 4-membered (hetero)cycle with the carbon atom to which they are attached. with 8 links, preferably with 4 to 6 links; and R3 represents: - a hydrogen atom; - a (Ci-C6)alkyl group.

[0012] The process of the invention allows for the strengthening of damaged hair fibers. In particular, the combined use of zinc salts and imidazole-type compounds allows the formation of a repairing material within the keratin fiber, thereby strengthening its internal structure and thus improving its mechanical properties.

[0013] When implementing one or more coloring agents, particularly in composition A, the process according to the invention also makes it possible to improve the coloring of keratin fibers, in particular the persistence of the coloring to shampoos.

[0014] In particular, the implementation of composition B makes it possible to improve the coloring of keratin fibers treated by one or more coloring agents, preferably present in composition A, in particular the persistence of the coloring to shampoos.

[0015] The invention also relates to a multi-compartment device comprising at least a first compartment containing said composition A and at least a second compartment containing said composition B.

[0016] The present invention also relates to the use of a coordination polymer that can be obtained from one or more zinc salts, as defined above, and from one or more imidazole-type compounds of formula (I) as defined below to improve color retention when one or more coloring agents are applied to keratin fibers, in particular hair.

[0017] Other objects, features, aspects and advantages of the invention will become even clearer upon reading the description and example that follows.

[0018] In what follows, and unless otherwise indicated, the bounds of a range of values ​​are included in that range, in particular in the expressions "between" and "ranging from ... to ...".

[0019] Furthermore, the expression "at least one" used in this description is equivalent to the expression "one or more".

[0020] Zinc salts Composition A implemented in the process of the invention comprises one or more zinc salts.

[0021] The zinc salt(s) may be organic or inorganic zinc salts.

[0022] For the purposes of the present invention, zinc salts are understood to mean hydrated or No.

[0023] The zinc salt(s) usable in composition A according to the present invention may be chosen from Zn(NO3)2 (zinc nitrate), ZnCl2 (zinc chloride), ZnBr2 (zinc bromide), Znl2 (zinc iodide), Zn(C1O4)2 (zinc perchlorate), ZnSO4 (zinc sulfate), Zn3(PO4)2 (zinc phosphate), Zn(CH3COO) (zinc acetate), Zn3(C6H5O7)2 (zinc citrate), Zn(CH2C(CH3)CO2)2 (zinc methacrylate), Zn(CH2CHCO2)2 (zinc acrylate), Zn(OCH2CH2CH3)2 (zinc propoxide), Zn(CiOHi4O7) (zinc acetylacetonate), Zn(C7Hi2NO3S)2 (zinc acetylmethionate), Zn(C4H6NO4)2 (zinc aspartate), ZnCO3(zinc carbonate), Zn5(CH3O6)2 (zinc carbonate hydroxide), zinc coceth sulfate (Zinc coceth sulfate), Ci2H220i4Zn (zinc gluconate), C4H8N2O4Zn (zinc glycinate), C6oHQ008Zn (zinc glycyrrhetinate), Zinc hy-drolyzed collagen, Zn(C3H5O3)2 (zinc lactate), C24H46O4Zn (zinc laurate), C28H54 O4Zn (zinc myristate), ZnO (zinc oxide), C32H62O4Zn (zinc palmitate),Zinc PCA (zinc salt of pyrrolidone carboxylic acid), Zn(C6H5O4S)2 (zinc phenol sulfonate), Zn(C5H4NOS)2 (zinc pyrithione), C36H66O6Zn (zinc ricinoleate), C14H1O2Zn (zinc salicylate), C12O2 (zinc stearate), ZnS (zinc sulfide), C22H38O4Zn (zinc undecylenate), ZINC DNA (zinc salt of deoxyribonucleic acid), and mixtures thereof.

[0024] Preferably, the zinc salt(s) are inorganic zinc salts. In other words, the zinc salt(s) are preferably chosen from mineral acid zinc salts.

[0025] More preferably, the zinc salt(s) are chosen from zinc chloride, zinc nitrate, and mixtures thereof.

[0026] Preferably, the total content of the zinc salt(s) included in composition A ranges from 0.1 to 20% by weight, more preferably from 0.5 to 10% by weight, more preferably still from 1 to 4% by weight, relative to the total weight of composition A.

[0027] In a preferred embodiment of the invention, the content of the zinc salt(s) selected from the zinc mineral acid salts included in composition A ranges from 0.1 to 20% by weight, more preferably from 0.5 to 10% by weight, more preferably from 1 to 4% by weight, relative to the total weight of composition A.

[0028] In a particular embodiment of the invention, the total zinc chloride content included in composition A ranges from 0.1 to 20% by weight, more preferably from 0.5 to 10% by weight, more preferably from 1 to 4% by weight, relative to the total weight of composition A.

[0029] In another particular embodiment of the invention, the total zinc nitrate content included in composition A ranges from 0.1 to 20% by weight, more preferably from 0.5 to 10% by weight, more preferably from 1 to 4% by weight, relative to the total weight of composition A.

[0030] Imidaz-type compounds. Composition B implemented in the process of the invention comprises one or more imidazole-type compounds of general formula (I): in which R1 and R2 independently represent: - a hydrogen atom; - a (Ci-C6)alkyl group possibly substituted by one or more identical or different groups chosen from: -C(O)OR and -NR'R”, with R representing a hydrogen atom or a (Ci-C4)alkyl group and R' and R” independently representing a hydrogen atom or a (Ci-C4)alkyl group; R1 and R2 can form with the carbon atom to which they are attached a (hetero)cycle of 4 to 8 links, preferably of 4 to 6 links; and R3 represents: - a hydrogen atom; - a (Ci-C6)alkyl group.

[0031] For the purposes of the present invention, the following definitions apply: ■ by "(hetero)cycle", a cycle or heterocycle, ■ by "cycle", a carbocycle, mono- or polycyclic, condensed or non-condensed, saturated or unsaturated, in particular aromatic, comprising from 6 to 22 carbon atoms, said cycle being able to be substituted by one or more identical or different groups, in particular selected from: (Ci-C6)alkyl, (Ci-C6)alkoxy, (Ci-C6)hydroxyalkyl, hydroxyl (-OH) or carboxyl (-COOH), ■ by "heterocycle", a mono- or polycyclic group, condensed or not, saturated or unsaturated, in particular aromatic, comprising from 5 to 22 links and containing from 1 to 3 heteroatoms selected from the nitrogen, oxygen or sulfur atom, said heterocycle being able to be substituted by one or more groups, identical or different, in particular selected from: (Ci-C6)alkyl, (Ci-C6)alkoxy, (Ci-C6)hydroxyalkyl, hydroxyl (-OH) or carboxyl (-COOH).

[0032] Preferably, R1 and R2 form with the carbon atom on which they are mounted a (hetero)cycle of 4 to 8 links, preferably of 4 to 6 links, more preferably R1 and R2 form with the carbon atom on which they are mounted a cycle of 4 to 6 links.

[0033] Preferably, R3 represents a hydrogen atom.

[0034] Preferably, R1 and R2 form with the carbon atoms to which they are attached a (Hetero)cycle of 4 to 8 links, in particular of 4 to 6 links, and R3 represents a hydrogen atom.

[0035] More preferably, the compound of formula (I) present in composition B is that in which, in formula (I), R1 and R2 form with the carbon atoms to which they are attached an aromatic ring of 6 groups and R3 represents a hydrogen atom. This formula corresponds to benzimidazole.

[0036] Preferably, the total content of the imidazole-type compound(s) of formula (I) present in composition B ranges from 0.1 to 20%, more preferably from 1 to 10% by weight, more preferably from 2 to 8% by weight, relative to the total weight of composition B.

[0037] In a particular embodiment, the total content of benzimidazole present in composition B is preferably from 0.1 to 20%, more preferably from 1 to 10% by weight, more preferably from 2 to 8% by weight, relative to the total weight of composition B.

[0038] Coloring agents Composition A and / or composition B, preferably composition A, implemented in the process of the invention may optionally include further one or more coloring agents, preferably chosen from direct dyes and / or pigments.

[0039] By "coloring agent" is meant an oxidation dye, a direct dye or a pigment.

[0040] By "direct dye" is meant a natural and / or synthetic dye, including in the form of extract(s), other than oxidation dyes. These are colored compounds that diffuse superficially onto the fiber. They can be ionic or non-ionic, i.e., anionic, cationic, neutral, or non-ionic.

[0041] Preferably, when present in composition A and / or composition B, preferably in composition A, the total content of the colouring agent(s) ranges from 0.01 to 10% by weight, more preferably from 0.01 to 2% by weight, relative to the total weight of composition A and / or composition B.

[0042] Direct colorants The coloring agent(s) possibly used in composition A and / or composition B, preferably in composition A, of the process according to the invention may be chosen from among the direct colorants.

[0043] The usable synthetic direct dyes are, for example, chosen from those classically used in direct dyeing, and among which we can mention all the aromatic and / or non-aromatic dyes in common use such as benzene nitrate, azo, hydrazono, (hetero)aryl nitrate, tri(hetero)arylmethane, (poly)methine, carbonyl, azinic, porphyrin, metallo-porphyrin, quinone, and in particular anthraquinone, indoamine, phthalo- cyanic and their mixtures.

[0044] Among the benzene nitrate direct dyes, the following may be mentioned: l,4-diamino-2-nitrobenzene, l-amino-2 nitro-4-[3-hydroxyethylaminobenzene; l-amino-2 nitro-4-bis([3-hydroxyethyl)-aminobenzene; 1,4-bis([3-hydroxyethylamino)-2-nitrobenzene; l-[3-hydroxyethylamino-2-nitro-4-bis-([3-hydroxyethylamino)-benzene; l-[3-hydroxyethylamino-2-nitro-4-aminobenzene; l-[3-hydroxyethylamino-2-nitro-4-(ethyl)([3-hydroxyethyl)-aminobenzene; l-amino-3-methyl-4-[3-hydroxyethylamino-6-nitrobenzene; l-amino-2-nitro-4-[3-hydroxyethylamino-5-chlorobenzene; l,2-diamino-4-nitrobenzene; l-amino-2-[3-hydroxyethylamino-5-nitrobenzene; 1,2-bis-([3-hydroxyethylamino)-4-nitrobenzene; l-amino-2-tris-(hydroxymethyl)-methylamino-5-nitrobenzene; l-Hydroxy-2-amino-5-nitrobenzene; l-Hydroxy-2-amino-4-nitrobenzene; l-Hydroxy-3-nitro-4-aminobenzene; l-Hydroxy-2-amino-4,6-dinitrobenzene; l-[3-hydroxyethyloxy-2-[3-hydroxyethylamino-5-nitrobenzene; l-Methoxy-2-[3-hydroxyethylamino-5-nitrobenzene; l-[3-hydroxyethyloxy-3-methylamino-4-nitrobenzene; l-[3,Y-dihydroxypropyloxy-3-methylamino-4-nitrobenzene; l-[3-hydroxyethylamino-4-[3,Y-dihydroxypropyloxy-2-nitrobenzene; l-[3,Y-dihydroxypropylamino-4-trifluoromethyl-2-nitrobenzene; l-[3-hydroxyethylamino-4-trifluoromethyl-2-nitrobenzene; l-[3-hydroxyethylamino-3-methyl-2-nitrobenzene; lP-aminoethylamino-5-methoxy-2-nitrobenzene; l-Hydroxy-2-chloro-6-ethylamino-4-nitrobenzene; l-Hydroxy-2-chloro-6-amino-4-nitrobenzene; l-Hydroxy-6-bis-([3-hydroxyethyl)-amino-3-nitrobenzene; l-[3-hydroxyethylamino-2-nitrobenzene; l-Hydroxy-4-[3-hydroxyethylamino-3-nitrobenzene.

[0045] Among the azo direct dyes, we can cite: Basic Red 51, Basic Orange 31, Disperse Red 17, Acid Yellow 9, Acid Black 1, Basic Red 22, Basic Red 76, Basic Yellow 57, Acid Yellow 36, Acid Orange 7, Acid Red 33, Acid Red 35, Acid Yellow 23, Acid Orange 24, Disperse Black 9, Basic Brown 16, Basic Brown 17.

[0046] Among the direct hydrazono colorants, we can mention: Basic Yellow 87.

[0047] Among the aryl nitrate direct dyes, the following may be mentioned: HC Blue 2, HC Yellow 2, HC Red 3, 4-hydroxypropylamino-3-nitrophenol, N,N'-bis-(2-hydroxyethyl)-2-nitro-phenylenediamine.

[0048] Among the triarylmethane direct dyes, the following may be mentioned: Basic Violet 1, Basic Violet 2 (New Fuchsin), Basic Violet 3, Basic Violet 4, Basic Violet 14, Basic Blue 1, Basic Blue 7, Basic Blue 26, Basic green 1, Basic Blue 77 (also called HC Blue 15), Acid Blue 1; Acid Blue 3; Acid Blue 7, Acid Blue 9; Acid Violet 49; Acid green 3; Acid green 5; Acid Green 50; Carminic Acid.

[0049] Among the quinone direct dyes, the following may be mentioned: Disperse Red 15, Solvent Violet 13, Acid Violet 43, Disperse Violet 1, Disperse Violet 4, Disperse Blue 1, Disperse Violet 8, Disperse Blue 3, Disperse Red 11, Acid Blue 62, Disperse Blue 7, Basic Blue 22, Disperse Violet 15, Basic Blue 99, as well as the following compounds: 1-N-methylmorpholiniumpropylamino-4-hydroxyanthraquinone, 1-aminopropylamino-4-methylaminoanthraquinone, 1-aminopropylamino-anthraquinone, 5-[3-hydroxyethyl-1,4-diaminoanthraquinone, 2-aminoethylamino-anthraquinone, 1,4-bis-([3,Y-dihydroxypropylamino)-anthraquinone, Acid Blue 25, Acid Blue 43, Acid Blue 78, Acid Blue 129, Acid Blue 138, Acid Blue 140, Acid Blue 251, Acid Green 25, Acid Green 41, Acid Violet 42, Mordant Red 3, Acid Black 48, HC Blue 16.

[0050] Among the direct azinic dyes, we can mention: Basic Blue 17, Basic Red 2.

[0051] Among the direct indamine dyes, the following may be mentioned: 2-[3-hydroxyethylamino-5-[bis-([3-4'-hydroxyethyl)amino]anilino-l,4-benzoquinone, 2-[3-hydroxyethylamino-5-(2' -methoxy-4' -amino)anilino-1,4-benzoquinone, 3-N(2'-chloro-4'-hydroxy)phenyl-acetylamino-6-methoxy-l,4-benzoquinone imine, 3-N(3'-chloro-4'-methylamino)phenyl-ureido-6-methyl-l,4-benzoquinone imine, 3-[4'-N-(ethyl,carbamylmethyl)-amino]-phenyl-ureido-6-methyl-l,4-benzoquinone imine.

[0052] Natural direct dyes are for example chosen from lawsone, juglone, indigo, leuco indigo, indirubine, isatin, hennotannic acid, alizarin, carthamine, morine, purpurine, carminic acid, kermesic acid, laccaic acid, purpurogallin, protocatechaldehyde, curcumin, spinulosin, apigenidine, orceins, carotenoids, betanin, chlorophylls, chlorophyllins or monascus.

[0053] Among the useful orthodiphenols according to the invention, the following may be mentioned: catechin, quercetin, brazilin, hematein, hematoxylin, chlorogenic acid, caffeic acid, gallic acid, L-DOPA, cyanidin, (-)-Epicatechin, (-)-Epigallocatechin, (-)-Epigallocatechin 3-gallate (EGCG), isoquercetin, pomiferin, esculetin, 6,7-Dihydroxy-3-(3-hydroxy-2,4-dimethoxyphenyl)coumarin, Santalin A and B, mangiferin, butein, maritimetin, sulfuretin, robtein, betanin, pericampylinone A, theaflavin, proanthocyanidin A2, proanthocyanidin B2, proanthocyanidin Cl, procyanidins DP 4-8, purpurogallin, 5,6-Dihydroxy-2-methyl-1,4-naphthoquinone, Alizarin, Wedelolactone and natural extracts containing them.

[0054] Preferably, direct azo dyes are used, and more preferably, Acid Red 33.

[0055] Preferably, when present in composition A and / or composition B, preferably in composition A, the colouring agent(s) chosen from among the direct colourings represent from 0.01 to 10% by weight, more preferably from 0.1 to 2% by weight, relative to the total weight of composition A and / or composition B.

[0056] Pigments The coloring agent(s) possibly used in composition A and / or composition B, preferably in composition A, of the process according to the invention can also be chosen from pigments.

[0057] By "pigment" is meant all pigments that impart color to keratin fibers. The solubility of the pigments in water at 25 °C and atmospheric pressure (760 mmHg) is less than 0.05% by weight, and preferably less than 0.01%.

[0058] These are solid particles, white or colored, naturally insoluble in the hydrophilic and lipophilic liquid phases commonly used in cosmetics or rendered insoluble by formulation in the form of a lacquer, where appropriate. More specifically, the pigments are slightly or not at all soluble in hydroalcoholic media.

[0059] The pigments that may be used are chosen in particular from among the organic and / or mineral pigments known to the art, especially those described in Kirk-Othmer's Encyclopedia of Chemical Technology and Ullmann's Encyclopedia of Industrial Chemistry. Examples of pigments include organic and inorganic pigments such as those defined and described in Ullmann's Encyclopedia of Industrial Chemistry, "Pigment Organics," 2005, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 10.1002 / 14356007.a20 371 and ibid., "Pigments, Inorganic, 1. General," 2009, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, 10.1002 / 14356007.a20_243.pub 3

[0060] These pigments may be in the form of a powder or pigment paste. They may be coated or uncoated.

[0061] Pigments can, for example, be chosen from mineral pigments, organic pigments, lacquers, special effect pigments such as mother-of-pearl or glitter, and mixtures thereof.

[0062] The pigment may be a mineral pigment. By "mineral pigment" is meant any pigment that meets the definition in the Ullmann Encyclopedia in the chapter on inorganic pigments. Examples of mineral pigments useful in the present invention include iron or chromium oxides, manganese violet, ultramarine blue, chromium hydrate, ferric blue, and titanium dioxide.

[0063] The pigment may be an organic pigment. By "organic pigment" is meant any pigment that meets the definition in the Ullmann Encyclopedia in the chapter on pigment organic. The organic pigment can notably be chosen from the compounds nitroso, nitro, azo, xanthene, quinoline, anthraquinone, phthalocyanine, of the metal complex type, isoindolinone, isoindoline, quinacridone, perinone, perylene, dicetopyrrolopyrrole, thioindigo, dioxazine, triphenylmethane, quinophthalone.

[0064] In particular, the white or colored organic pigments may be selected from carmine, carbon black, aniline black, azo yellow, quinacridone, phthalocyanine blue, sorghum red, the blue pigments coded in the Color Index under references Cl 42090, 69800, 69825, 73000, 74100, 74160, the yellow pigments coded in the Color Index under references Cl 11680, 11710, 15985, 19140, 20040, 21100, 21108, 47000, 47005, the green pigments coded in the Color Index under references Cl 61565, 61570, 74260, the pigments oranges coded in the Color Index under the references CI 11725, 15510, 45370, 71105, red pigments coded in the Color Index under the references CI 12085, 12120, 12370, 12420, 12490, 14700, 15525, 15580, 15620, 15630, 15800, 15850, 15865, 15880, 17200, 26100, 45380, 45410, 58000, 73360, 73915, 75470, pigments obtained by oxidative polymerization of indole derivatives,phenolic compounds as described in French patent FR 2 679 771.

[0065] According to a particular embodiment of the invention, pigment pastes of organic pigments such as the products sold by the company HOECHST under the name are used as pigment(s): - COSMENYL YELLOW IOG: Pigment YELLOW 3 (Cl 11710); - COSMENYL YELLOW G: Pigment YELLOW 1 (Cl 11680); - ORANGE COSMENYL GR: Pigment ORANGE 43 (Cl 71105); - COSMENYL RED R: Pigment RED 4 (Cl 12085); - CARMIN COSMENYL FB: Pigment RED 5 (Cl 12490); - VIOLET COSMENYL RL: Pigment VIOLET 23 (Cl 51319); - COSMENYL BLUE A2R: Pigment BLUE 15.1 (Cl 74160); - VERT COSMENYL GG: Pigment GREEN 7 (Cl 74260); - COSMENYL BLACK R: Pigment BLACK 7 (Cl 77266).

[0066] The pigments according to the invention may also be in the form of composite pigments as described in patent EP 1 184 426. These composite pigments may be composed, in particular, of particles comprising: - an inorganic nucleus, - at least one binder ensuring the fixation of organic pigments on the core, and - at least one organic pigment covering at least partially the core.

[0067] By "lacquer," we mean colorants adsorbed onto insoluble particles, the resulting mass remaining insoluble during use. Examples of inorganic substrates onto which the colorants are adsorbed include alumina and silica. Calcium sodium borosilicate or calcium aluminum borosilicate, and aluminum. Among organic dyes, we can mention cochineal carmine.

[0068] Examples of lacquers include products known by the following names: D&C Red 21 (CI 45380), D&C Orange 5 (CI 45370), D&C Red 27 (CI 45410), D&C Orange 10 (CI 45425), D&C Red 3 (CI 45430), D&C Red 7 (CI 15850:1), D&C Red 4 (CI 15510), D&C Red 33 (CI 17200), D&C Yellow 5 (CI 19140), D&C Yellow 6 (CI 15985), D&C Green (CI 61570), D&C Yellow 10 (CI 77002), D&C Green 3 (CI 42053), D&C Blue 1 (CI 42 090).

[0069] The pigment(s) may also be special effect pigments.

[0070] By "special effect pigments" is meant pigments that generally create a colored appearance (characterized by a certain shade, vibrancy and clarity) that is non-uniform and changes depending on the viewing conditions (light, temperature, viewing angles, etc.). They are thus contrasted with colored pigments that provide a uniform opaque, semi-transparent or conventional transparent tint.

[0071] There are several types of special effect pigments, those with a low refractive index such as fluorescent, photochromic or thermochromic pigments, and those with a higher refractive index such as mother-of-pearl or glitter.

[0072] Examples of special effect pigments include pearlescent pigments such as titanium mica coated with iron oxide, mica coated with iron oxide, mica coated with bismuth oxychloride, titanium mica coated with chromium oxide, titanium mica coated with an organic colorant, particularly of the type mentioned above, as well as pearlescent pigments based on bismuth oxychloride. They may also consist of mica particles on the surface of which at least two successive layers of metal oxides and / or organic colorants are superimposed.

[0073] Mother-of-pearl may in particular have a yellow, pink, red, bronze, orange, brown, gold and / or copper colour or reflection.

[0074] By way of illustration of the mother-of-pearls that can be used in the context of the present invention, one may mention in particular gold-colored mother-of-pearls marketed by ENGELHARD under the names Gold 222C (Cloisonne), Sparkle Gold (Timica), Gold 4504 (Chromalite), and Monarch Gold 233X (Cloisonne); bronze mother-of-pearls marketed by MERCK under the names Bronze Fine (17384) (Colorona) and Bronze (17353) (Colorona), by Eckart under the name Prestige Bronze, and by ENGELHARD under the name Super Bronze (Cloisonne); orange mother-of-pearls marketed by ENGELHARD under the names Orange 363C (Cloisonne) and Orange MCR 101 (Cosmica), and by MERCK under the name Passion orange (Colorona) and Matte orange (17449) (Microna); brown-tinted mother-of-pearls, notably marketed by ENGELHARD under the name Nu-antique copper 340XB (Cloisonne) and Brown CL4509 (Chromalite); copper-tinted mother-of-pearls, notably marketed by ENGELHARD under the name Copper 340A (Timica) and by Eckart under the name Prestige Copper; red-tinted mother-of-pearls, notably marketed by MERCK under the name Sienna fine (17386) (Colorona); yellow-tinted mother-of-pearls, notably marketed by ENGELHARD under the name Yellow (4502) (Chromalite); red-tinted mother-of-pearls with a gold tint, notably marketed by ENGELHARD under the name Sunstone G012 (Gemtone);black mother-of-pearl with a gold sheen, notably marketed by the company ENGELHARD under the name Nu antique bronze 240 AB (Timica); blue mother-of-pearl, notably marketed by the company MERCK under the names Matte blue (17433) (Microna), Dark Blue (117324) (Colorona); white mother-of-pearl with a silver sheen, notably marketed by the company MERCK under the name Xirona Silver; and orange-pink and golden-green mother-of-pearl, notably marketed by the company MERCK under the name Indian summer (Xirona), and their mixtures.

[0075] In addition to mother-of-pearl on a mica support, one can consider multilayer pigments based on synthetic substrates such as alumina, silica, calcium and sodium borosilicate or calcium and aluminum borosilicate, and aluminum.

[0076] Other examples include non-substrate interference pigments such as liquid crystals (Wacker's Helicones HC) and interference holographic glitter (Spectratek's Geometry Pigments or Spectra f / x). Special effect pigments also include fluorescent pigments, whether daylight fluorescent or ultraviolet fluorescent, phosphorescent pigments, photochromic pigments, thermochromic pigments, and quantum dots, marketed, for example, by Quantum Dots Corporation.

[0077] The variety of pigments that can be used in the present invention makes it possible to obtain a rich palette of colors, as well as particular optical effects such as metallic, interference effects.

[0078] The size of the pigment(s) used in the composition according to the present invention generally ranges from 10 nm to 200 µm, preferably from 20 nm to 80 µm, and more preferably from 30 nm to 50 µm.

[0079] The pigments can be dispersed in composition A and / or composition B, preferably in composition A, implemented in the process according to the invention by means of a dispersing agent.

[0080] By "dispersing agent" is meant a compound which makes it possible to protect the particles dispersed against their agglomeration or flocculation. This dispersing agent may be a surfactant, an oligomer, a polyphenol, a polymer, or a mixture of several of these, possessing one or more functionalities with a strong affinity for the surface of the particles to be dispersed. In particular, they may bind physically or chemically to the surface of the pigments. These dispersing agents also possess at least one functional group compatible with or soluble in the continuous medium. The agent may be charged, anionic, cationic, zwitterionic, or neutral.

[0081] According to a particular embodiment of the invention, the dispersing agents used are chosen from among the esters of 12-hydroxystearic acid more particularly and of C8 to C20 fatty acids and of polyols such as glycerol, diglycerin, such as poly(12-hydroxystearic) acid stearate with a molecular weight of about 750 g / mol such as that sold under the name Solsperse 21 000 by the company Avecia, poly(12-hydroxystearic) dipolyhydroxystearate (name CTFA) sold under the reference Dehymyls PGPH by the company Henkel or polyhydroxystearic acid such as that sold under the reference Arlacel P100 by the company Uniqema, polyphenols such as tannic acid and their mixtures.

[0082] As another dispersant that can be used in the compositions of the invention, we can mention quaternary ammonium derivatives of polycondensed fatty acids such as Solsperse 17 000 sold by Avecia, poly dimethylsiloxane / oxypropylene mixtures such as those sold by Dow Corning under the references DC2-5185, DC2-5225 C.

[0083] The pigments used in composition A and / or composition B, preferably in composition A, used in the process of the invention can be surface treated with an organic agent.

[0084] Thus, the pigments previously treated on the surface useful within the framework of the invention are pigments which have undergone totally or partially a surface treatment of a chemical, electronic, electro-chemical, mechano-chemical or mechanical nature, with an organic agent such as those described in particular in Cosmetics and Toiletries, February 1990, Vol. 105, p. 53-64 before being dispersed in the composition according to the invention.These organic agents may be chosen for example from amino acids; waxes, for example carnauba wax and beeswax; fatty acids, fatty alcohols and their derivatives, such as stearic acid, hydroxystearic acid, stearyl alcohol, hydroxystearyl alcohol, lauric acid and their derivatives; anionic surfactants; lecithins; sodium, potassium, magnesium, iron, titanium, zinc or aluminium salts of fatty acids, for example aluminium stearate or laurate; metal alkoxides; polysaccharides, for example chitosan, cellulose and its derivatives; polyethylene; (meth)acrylic polymers, for example polymethylmethacrylates; polymers and co. polymers containing acrylate motifs; proteins; alkanoamines; silicone compounds, for example silicones, polydimethylsiloxanes, al-coxysilanes, alkylsilanes, siloxysilicates; fluorinated organic compounds, for example perfluoroalkyl ethers; fluorosilicone compounds.

[0085] The surface-treated pigments used in composition A and / or composition B, preferably in composition A, used in the process of the invention may also have been treated by a mixture of these compounds and / or have undergone several surface treatments.

[0086] The surface-treated pigments useful in the context of the present invention can be prepared according to surface treatment techniques well known to those skilled in the art or found as such in the commercial market.

[0087] Preferably, the surface-treated pigments are covered by an organic layer.

[0088] The organic agent with which the pigments are treated can be deposited on the pigments by solvent evaporation, chemical reaction between the molecules of the surfactant or creation of a covalent bond between the surfactant and the pigments.

[0089] Surface treatment can thus be achieved, for example, by a chemical reaction of a surfactant with the surface of the pigments and the creation of a covalent bond between the surfactant and the pigments or fillers. This method is described in particular in US patent 4,578,266.

[0090] Preferably, an organic agent covalently linked to the pigments will be used.

[0091] The pigments used in composition A and / or composition B, preferably in composition A, used in the process of the invention can be surface treated with an organic agent.

[0092] Composition A and / or composition B, preferably composition A, implemented in the process of the invention may further comprise one or more pigments not treated on the surface.

[0093] According to a particular embodiment of the invention, the pigment(s) are mineral pigments.

[0094] According to another particular embodiment of the invention, the pigment or pigments are chosen from among the mother-of-pearls.

[0095] More preferably, the pigment(s) used in composition A and / or composition B, preferably in composition A, of the process of the invention are chosen from carbon blacks such as Black 2, iron oxides in particular red, brown or black, and their mixtures.

[0096] Preferably, the coloring agent(s) chosen from the pigments present in composition A and / or composition B, preferably in composition A, of the process of the invention, represent from 0.01 to 10% by weight, more preferably from 0.1 to 2% by weight, relative to the total weight of composition A and / or composition B.

[0097] According to a preferred embodiment of the invention, composition A and / or composition B, preferably composition A, comprise one or more coloring agents selected from direct colorants.

[0098] According to a preferred embodiment of the invention, composition A comprises one or more coloring agents selected from direct colorants.

[0099] In a particular embodiment of the invention, the optional coloring agent(s) are present in a composition C, different from compositions A and B.

[0100] Composition A and / or composition B implemented in the process according to the invention preferably comprise water.

[0101] Advantageously, composition A comprises a total water content ranging from 10 to 99.9% by weight, relative to the total weight of composition A.

[0102] Advantageously, composition B comprises a total water content of 25 to 60% by weight, preferably of 35 to 50% by weight, relative to the total weight of composition B.

[0103] Composition A and / or composition B, preferably composition B, implemented in the process according to the invention may comprise one or more organic solvents.

[0104] The organic solvent(s) may be chosen from linear or branched monoalcohols, having from 1 to 6 carbon atoms, preferably from 1 to 4 carbon atoms, polyols, polyethylene glycols, aromatic alcohols and mixtures thereof.

[0105] Among monoalcohols, we can mention in particular ethanol, propanol, butanol, isopropanol, isobutanol and their mixtures, better ethanol.

[0106] Among the polyethylene glycols, we can mention in particular propylene glycol, dipropylene glycol, isoprene glycol, butylene glycol and pentylene glycol.

[0107] Among the polyols, glycerol and sorbitol can be mentioned in particular.

[0108] Among aromatic alcohols, we can notably mention benzyl alcohol and phenoxyethanol.

[0109] Advantageously, the total content of organic solvents present in composition A and / or composition B, preferably composition B, ranges from 25 to 75% by weight, preferably from 30 to 60% by weight, relative to the total weight of the composition which includes them.

[0110] In a particular embodiment, the total ethanol content ranges from 25 to 75% by weight, preferably from 30 to 60% by weight, relative to the total weight of the composition which includes it.

[0111] In a preferred embodiment, composition A and / or composition B are set implemented in the process according to the invention include water and an organic solvent.

[0112] In a particularly preferred embodiment, composition A and / or composition B implemented in the process according to the invention comprise water and ethanol.

[0113] In another particularly preferred embodiment, composition A and composition B implemented in the process according to the invention comprise water and ethanol.

[0114] Advantageously, the weight ratio between the total water content and the total organic solvent content is 1.

[0115] In a preferred embodiment of the invention, the weight ratio between the total water content and the total ethanol content is 1.

[0116] Additives Composition A and / or composition B implemented in the process according to the invention may optionally include one or more additional compounds different from the compounds defined above, preferably selected from anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric or zwitterionic surfactants, reducing agents, softeners, antifoaming agents, moisturizing agents, UV filters, peptizers, solubilizers, perfumes, anionic, cationic, nonionic, amphoteric polymers or mixtures thereof, anti-dandruff agents, anti-seborrheic agents, vitamins and pro-vitamins including panthenol, plasticizers, solubilizing agents other than the solvents of the invention, acidifying agents, mineral or organic thickening agents, in particular polymeric thickening agents, antioxidants, hydroxy acids, perfumes,Preservatives, and mixtures thereof.

[0117] Preferably, when the above additional compound(s) are present in composition A and / or composition B implemented in the process according to the invention, the additional compound(s) are generally present in a content of between 0.01 and 20% by weight for each of them, relative to the total weight of the composition which includes them.

[0118] Of course, a person skilled in the art will take care to choose this or these possible additional compounds in such a way that the advantageous properties intrinsically attached to the cosmetic compositions implemented in the invention are not, or substantially not, altered by the envisaged addition(s).

[0119] Process The present invention relates to a cosmetic treatment process for keratin fibers, in particular human keratin fibers such as hair, including application to said fibers: i) of a composition A as defined above, and ii) of a composition B as defined above.

[0120] Composition B is different from composition A, in other words, the process of the invention is a process implementing two different compositions.

[0121] Preferably, composition A is applied before composition B. In other words, the cosmetic treatment process preferably comprises the application to said fibers: i) of a composition A as defined above, then ii) of a composition B as defined above.

[0122] Alternatively, composition B can be applied before composition A.

[0123] Preferably, the keratin fibers are not rinsed with water between the application of compositions A and B.

[0124] Composition A and / or composition B are applied at a temperature preferably between 10 and 40°C, preferably between 20 and 40°C.

[0125] The application bath ratio of composition A and composition B is preferably between 0.5 and 20 grams of composition A or composition B per gram of keratin fibers.

[0126] According to one embodiment, the cosmetic treatment process according to the invention comprises the application: (i) of a composition A comprising one or more zinc salts, and optionally one or more coloring agents selected from direct colorants and / or pigments, and ii) of a composition B comprising one or more imidazole-type compounds of general formula (I): in which R1 and R2 independently represent: - a hydrogen atom; - a (Ci-C6)alkyl group possibly substituted by one or more identical or different groups chosen from: -C(O)OR and -NR'R”, with R representing a hydrogen atom or a (Ci-C4)alkyl group and R' and R” independently representing a hydrogen atom or a (Ci-C4)alkyl group; R1 and R2 can form with the carbon atom to which they are attached a (hetero)cycle of 4 to 8 links, preferably of 4 to 6 links; and R3 represents: - a hydrogen atom; - a (Ci-C6)alkyl group, and possibly one or more coloring agents chosen from among direct dyes and / or pigments; it being understood that composition A and / or composition B, preferably composition A, comprise one or more coloring agents selected from direct dyes and / or pigments.

[0127] In other words, the process of the invention is a process for coloring keratin fibers, in particular human keratin fibers such as hair.

[0128] The cosmetic treatment process according to the invention can be carried out on dry or wet keratin fibers, as well as on all types of fibers, light or dark, natural or colored, permed, bleached or straightened.

[0129] Preferably, the cosmetic treatment process according to the invention is carried out on sensitized keratin fibers, such as permed and / or straightened and / or colored and / or bleached keratin fibers, in particular bleached.

[0130] In other words, the process is preferably a cosmetic treatment process for sensitized keratin fibers, in particular human keratin fibers such as hair, such as permed, and / or straightened, and / or colored and / or bleached keratin fibers, in particular bleached, comprising the application to said fibers of a composition A, as defined above, and of a composition B as defined above.

[0131] In other words, the process according to the invention is preferably implemented after a coloring, straightening, perming and / or bleaching process, in particular a bleaching process of keratin fibers, especially human keratin fibers such as hair.

[0132] Preferably, the process according to the invention is a process for preventing breakage and / or repairing keratin fibers, in particular sensitized ones, such as permed, straightened, colored and bleached keratin fibers, in particular bleached ones.

[0133] According to a particular embodiment of the process of the invention, the fibers are washed before the implementation of the process of the invention, that is to say before the application of compositions A and B described above.

[0134] The application of compositions A and B used in the process of the invention on keratin fibers can be carried out by any conventional means, in particular by means of a comb, a brush, a paintbrush or fingers.

[0135] The cosmetic treatment process according to the invention generally involves a processing time for each of the compositions A and B according to the invention, this processing time exposure varying from 15 seconds to 1 hour, preferably from 15 minutes to 1 hour such as 30 minutes.

[0136] Preferably, between the application of composition A and the application of composition B, the keratin fibers are wrung out in order to remove the excess of the first composition applied according to the process of the invention.

[0137] At the end of the cosmetic treatment process according to the invention, the keratin fibers can be rinsed with water. They can optionally be washed with shampoo, followed by rinsing with water, before being dried or left to dry.

[0138] The present invention also relates to the use of a coordination polymer that can be obtained from one or more zinc salts, as defined above, and from one or more imidazole-type compounds of formula (I) as defined above to improve color retention when one or more coloring agents are implemented on keratin fibers, in particular hair.

[0139] In other words, the invention relates to the use of a polymer as defined above to improve the color retention of keratin fibers colored by at least one coloring agent.

[0140] For the purposes of the present invention, the coordination polymer represents a three-dimensional hybrid network, consisting of metal-ligand bonds. In particular, the coordination polymer according to the invention is formed from a precursor based on Zn(II) ions with one or more ligand(s) corresponding to the conjugate base of the imidazole-type compound of formula (I) as defined above, more particularly the coordination polymer according to the invention is formed from a zinc salt Zn(II) and 1 to 4 imidazole-type compounds of formula (I) as described above.

[0141] The invention also relates to a multi-compartment device comprising at least a first compartment containing a composition A as defined above and at least a second compartment containing a composition B as defined above.

[0142] In a particular embodiment, the invention relates to a multi-compartment device comprising: - at least one first compartment containing a composition A comprising one or more zinc salts, and optionally one or more coloring agents selected from direct dyes and / or pigments, and - at least one second compartment containing a composition B comprising one or more imidazole-type compounds of general formula (I) and optionally one or more coloring agents selected from direct dyes and / or pigments, it being understood that at least one of the compositions A or B, preferably composition A, includes the coloring agent(s).

[0143] In another particular embodiment, the invention relates to a multi-compartment device comprising: - at least one first compartment containing a composition A comprising one or more zinc salts, - at least one second compartment containing a composition B comprising one or more imidazole-type compounds of general formula (I), and - at least one third compartment containing one or more coloring agents chosen from among the direct dyes and / or pigments as defined above.

[0144] The following examples serve to illustrate the invention without, however, being limiting in nature.

[0145] Examples In the following examples, all quantities are given as mass percentage of active material (AM) relative to the total weight of the composition (unless otherwise stated). Example 1

[0146] a) Preparation of compositions A hydroalcoholic solution was prepared by mixing an equimass ratio of water and absolute ethanol (Water / ethanol 50 / 50 w / w%). Compositions Al, A2 and B according to the invention are then prepared from this hydroalcoholic solution. The details of the compositions are shown in Table 1 below:

[0147] [Tables] Composition A1 Composition A2 Composition B Zinc chloride 1.4 1.4 - Red33 - 0.3 - Water / ethanol 50 / 50 w / w% Qsp 100 Qsp 100 Qsp 100 Benzimidazole - - 5

[0148] b} Protocol Strands of Caucasian HT4 hair are pre-bleached twice with a persulfate-based bleaching treatment at a ratio of 10 grams of treatment per gram of strand. The treatment is applied to the strands for a processing time of 25 minutes per side (50 minutes total) at a temperature of 33°C. After each bleaching session, the strands are washed with UltraDoux Camomile shampoo and then dried with a hairdryer on high flow, medium heat. Compositions Al and A2 are then each applied to a double bleached strand, at room temperature for 30 min, with a bath ratio of 15 grams of composition per gram of strand. The strands are then wrung out and composition B is applied to the strands, at room temperature for 30 min, with a bath ratio of 15 grams of composition per gram of strand. The strands are then wrung out and dried with a hairdryer.

[0149] c) Evaluation of the integrity of keratin fibers The integrity (i.e., the repair) of the keratin fibers of the strands is then assessed by differential scanning calorimetry (also called DSC).

[0150] Differential scanning calorimetry is known to those skilled in the art as a method for quantifying protein strengthening in the cortex of keratin fibers (Kinetics of the changes imparted to the main structural components of human hair by thermal treatment, https: / / doi.org / 10.1016 / j.tca.2018.01.014 & F.-J. Wortmann and H. Deutz, J. Appl. Polym Sci., 48, 137 (1993)). The principle of the test is to measure the protein denaturation temperature. It is widely recognized that the higher the protein denaturation temperature, the better the integrity of the cortex proteins, which translates into greater fiber resistance to breakage.

[0151] The denaturation temperature is directly related to the binding density of keratin proteins present in the cortex. Thus, the lower the denaturation temperature, the lower the binding density of the proteins to each other, the more disulfide bonds break, and the cortex is damaged. A difference of 2°C is recognized by those skilled in the art as a significant change.

[0152] The apparatus used to perform the measurements is a Mettler Toledo DSC 3+ Star System reference apparatus (temperature range: 30°C - 250°C; heating ramp of 10°C / min). This apparatus measures the energy flow during the heating of the sample. The temperature at which the energy flow is highest represents the denaturation temperature.

[0153] The results of the measurements of the denaturation temperature of each of the wicks treated according to the protocol described above are summarized in the table below and correspond to the average of the measurements carried out.

[0154] [Tables2] Compositions Comment Denaturation Temperature (°C) - Natural Hair (HT4 Caucasian) 154.5 Persulfate-based bleaching x 2 Double bleached strand 128.2 Al (comparative) Zinc chloride alone 145.3 B (comparative) Benzimidazole alone 128.6 Al + B (invention) Zinc chloride + Benzimidazole 149.4 A2 + B (invention) Zinc chloride and dye + Benzimidazole 148.4

[0155] The process according to the invention using compositions Al and B makes it possible to increase the denaturation temperature of the fiber proteins (to 149.4 °C), which is significant compared to the doubly bleached reference (BlondStudio8 x 2: 128.2 °C). The invention differs from a process implementing a simple application of one of the two compositions Al or B taken in isolation, which does not allow to have a denaturation temperature as close as possible to the initial Caucasian HT4 hair (154.5 °C), respectively 145.3 °C for Al, and 128.6 °C for B. The same result is observed for a process according to the invention using a coloring agent (process A2 + B), in which the denaturation temperature rises to 148.4 °C. Example 2

[0156] a) Preparation of compositions Compositions A2 and B are prepared as in example 1 above.

[0157] b) Protocol Caucasian HT4 hair extensions are pre-bleached twice with a persulfate-based bleaching treatment at a ratio of 10 grams of treatment per gram of hair. The treatment is applied to the extensions for a resting time of 25 minutes per side (50 min total) at a temperature of 33°C. After each bleaching session, the strands are washed with UltraDoux Camomile shampoo and then dried with a hairdryer on high flow, medium heat. Composition A2 is then applied to the double bleached strands, at room temperature for 30 minutes, with a bath ratio of 15 grams of composition per gram of strand. The strands are then wrung out. Solution B is applied to one of the strands at room temperature for 30 minutes, with a bath ratio of 15 grams of solution per gram of strand. The strand is then towel-dried and blow-dried. The strands are washed using a standard shampoo (Garnier Ultra Doux) 24 hours after the application of the treatment. The hair strands are then rinsed, combed, and blow-dried.

[0158] c) Analysis of color persistence The persistence of the strand color was evaluated in the CIE L*a*b* system, using a Minolta Spectrophotometer CM3600D colorimeter (illuminant D65, angle 10°, specular component included),

[0159] In this L*a*b* system, L* represents the intensity of the color, a* indicates the green / red color axis and b* the blue / yellow color axis.

[0160] The color permanence is evaluated by the color difference AEremanence between the colored strands before shampooing, then after 1 and 3 shampoos. The lower the AEremanence value, the more the color persists after shampooing. The value of AErémanence is calculated according to the following equation: = V “ L0)2 + (“* ” “o)2 + (b* - h0)2 In this equation, L*, a* and b* represent the values ​​measured after hair coloring and after undergoing 1 or 3 shampoos, and Lo*, a0* and b0* represent the values ​​measured after hair coloring but before shampooing.

[0161] [Tables3] Composition Comment Number of L* a* b* AE ^^residual effect of shampoo A2 (comparative) Zinc chloride and colorant alone 0 29.04 35.3 5.24 - 1 42.06 31.28 6.03 13.65 3 48.02 25.13 10.8 22.24 A2 + B (invention) Zinc chloride and colorant + Benzomidazole 0 40.83 37.2 0.24 - 1 41.94 33.01 5.39 6.73 3 46.55 26.01 9.32 15.50

[0162] The process according to the invention, using compositions A2 and B, provides greater residual color than solution A2 applied alone. After three shampoos, the residual color value (AEremanence) for the strand after application according to the process of the invention (A2+B) is 15.5. This residual color value (AEremanence) is 22.2 for the comparative treatment (A2 alone) after three shampoos.

[0163] Thus, the coloring of the keratin fiber according to the process of the invention presents an improvement in the persistence of the color to shampoos.

Claims

Demands

1. A cosmetic treatment process for keratin fibers, in particular human keratin fibers such as hair, comprising the application: i) of a composition A comprising one or more zinc salts, and ii) of a composition B comprising one or more imidazole-type compounds of general formula (I): in which R1 and R2 independently represent: - a hydrogen atom; - a (Ci-C6)alkyl group possibly substituted by one or more identical or different groups chosen from: -C(O)OR and -NR'R”, with R representing a hydrogen atom or a (Ci-C4)alkyl group and R' and R” independently representing a hydrogen atom or a (Ci-C4)alkyl group; R1 and R2 can form with the carbon atom on which they are based a (hetero)cycle of 4 to 8 links, preferably of 4 to 6 links; and R3 represents: - a hydrogen atom; - a (Ci-C6)alkyl group.

2. A process according to claim 1, characterized in that the zinc salt(s) included in composition A are selected from organic zinc salts, inorganic zinc salts and mixtures thereof, preferably from zinc mineral acid salts, more preferably from Zn(NO3)2 (zinc nitrate), ZnCl2 (zinc chloride), ZnBr2 (zinc bromide), Znl2 (zinc iodide), Zn(C1O4)2 (zinc perchlorate), ZnSO4 (zinc sulfate), Zn3(PO4)2 (zinc phosphate), Zn(CH3COO) (zinc acetate), Zn3(C6H5O7)2 (zinc citrate), Zn(CH2C(CH3)CO2)2 (zinc methacrylate), Zn(CH2CHCO2)2 (zinc acrylate), Zn(OCH2 CH2CH3)2 (zinc propoxide), Zn(Ci0Hi4O7) (zinc acetylacetonate), Zn(C7Hi2NO3S)2 (zinc acetylmethionate), Zn(C4H6NO4)2 (zinc aspartate), ZnCO3(zinc carbonate), Zn5(CH3O6)2 (zinc carbonate hydroxide), zinc coceth sulfate (Zinc coceth sulfate), Ci2H220i4Zn (zinc gluconate), C4H8N2O4Zn (zinc glycinate), C6OHO8Zn (zinc glycyrrhetinate), Zinc hydrolyzed collagen, Zn(C3H5O3)2 (zinc lactate), C24H46O4Zn (zinc laurate), C28H54O4Zn (zinc myristate), ZnO (zinc oxide), C32H62O4Zn (zinc palmitate), Zinc PCA (zinc salt of pyrrolidone carboxylic acid), Zn(C6H5O4S)2 (zinc phenolsulfonate), Zn(C5H4NOS)2 (zinc pyrithione), C36H66O6Zn (zinc ricinoleate), C4H8O6Zn (zinc salicylate), C36H7O4Zn (zinc stearate), ZnS (zinc sulfide), C22H38O4Zn (zinc undecylenate), ZINC DNA (zinc salt of deoxyribonucleic acid) and mixtures thereof, more preferably among Zn(NO3)2 (zinc nitrate), ZnCl2 (zinc chloride), and mixtures thereof.

3. A process according to any one of the preceding claims, characterized in that the total content of the zinc salt(s) included in composition A ranges from 0.1 to 20% by weight, preferably from 0.5 to 10% by weight, more preferably from 1 to 4% by weight, relative to the total weight of composition A.

4. A method according to any one of the preceding claims, characterized in that the imidazole-type compound(s) of general formula (I) included in composition B are those in which R1 and R2 form with the carbon atom to which they are attached a (hetero)cycle of 4 to 8 members, preferably of 4 to 6 members, and R3 represents a hydrogen atom, more preferably the imidazole-type compound of formula (I) is benzimidazole

5. A method according to any one of the preceding claims, characterized in that the total content of the imidazole-type compound(s) of formula (I) included in composition B ranges from 0.1 to 20% by weight, preferably from 1 to 10% by weight, more preferably from 2 to 8% by weight, relative to the total weight of composition R

6. A method according to any one of the preceding claims, characterized in that composition A and / or composition B, preferably composition A, further comprise one or more coloring agents, preferably selected from direct dyes and / or pigments.

7. A method according to the preceding claim, characterized in that the coloring agent(s) are chosen from direct dyes, preferably from azo direct dyes, preferably the direct dye is Acid Red 33.

8. A process according to any one of the preceding claims, characterized in that composition A and / or composition B further comprise water, preferably: - composition A comprises a total water content of 10 to 99.9% by weight, relative to the total weight of composition A, and / or - composition B comprises a total water content of 20 to 65% by weight, preferably 35 to 50% by weight, relative to the total weight of composition B.

9. A process according to any one of the preceding claims, characterized in that composition A and / or composition B, preferably composition B, further comprise one or more organic solvents, preferably selected from linear or branched monoalcohols, having from 1 to 6 carbon atoms, preferably from 1 to 4 carbon atoms, polyols, polyethylene glycols, aromatic alcohols and mixtures thereof.

10. A process according to the preceding claim, characterized in that the total content of organic solvents ranges from 25 to 75% by weight, preferably from 30 to 60% by weight, relative to the total weight of the composition comprising them.

11. A method according to any one of the preceding claims, characterized in that composition A is applied before composition R

12. A process according to any one of the preceding claims, characterized in that said process is carried out on keratin fibers, sensitized in particular human keratin fibers such as hair, such as permanent and / or straightened and / or colored and / or bleached human keratin fibers, in particular bleached.

13. A method according to any one of the preceding claims, characterized in that composition A and / or composition B are applied at a temperature between 10 and 40°C, preferably between 20 and 40°C.

14. A method according to any one of the preceding claims, characterized in that the application bath ratio of composition A and composition B is between 0.5 and 20 grams of composition A or composition B per gram of keratin fibers.

15. A multi-compartment device comprising a first compartment containing a composition A as defined according to one any of claims 1 to 3 and 6 to 10 and a compartment containing a composition B as defined according to any one of claims 1, 4 to 10.