CARBON ATOMS

The present invention relates to a composition for dyeing human keratin fibres, especially the hair. The invention also relates to a dyeing process using this composition, and to a multi-compartment device containing it.

Among the methods for dyeing human keratin fibres, such as the hair, mention may be made of oxidation dyeing or permanent dyeing. More particularly, this dyeing method uses one or more oxidation dyes and usually one or more oxidation bases optionally combined with one or more couplers.

In general, oxidation bases are chosen from ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic compounds. These oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can give access to coloured species.

The shades obtained with these oxidation bases are often varied by combining them with one or more couplers, these couplers being chosen especially from aromatic meta- diamines, rmeta-aminophenols, meta-diphenols and certain heterocyclic compounds, such as indole compounds.

The variety of molecules used as oxidation bases and couplers allows a wide range of colours to be obtained.

It is also possible to add to these compositions direct dyes, which are coloured and colouring molecules that have affinity for fibres. The direct dyes generally used are chosen from nitrobenzene, anthraquinone, nitropyridine, azo, methine, azomethine, xanthene, acridine, azine and triarylmethane direct dyes. The presence of such compounds enables the obtained coloration to be further enriched with tints or enables the chromaticity of the obtained coloration to be increased.

Oxidation dyeing processes thus consist in using with these dye compositions a composition comprising at least one oxidizing agent, generally hydrogen peroxide, under alkaline pH conditions in the vast majority of cases. The role of this oxidizing agent is to reveal the coloration, via an oxidative condensation reaction between the oxidation dyes.

Oxidation dyeing must moreover satisfy a certain number of requirements. Thus, it must be free of toxicological drawbacks, it must enable shades to be obtained in the desired intensity and it must show good resistance to external attacking factors such as light, bad weather, washing, permanent waving, perspiration and rubbing.

The dyes must also be able to cover grey hair and, finally, they must be as unselective as possible, i.e. they must produce the smallest possible colour differences along the same keratin fibre, which generally comprises areas that are differently sensitized (i.e. damaged) from its end to its root.

It is common practice to use dye compositions containing particular polymers that are aimed at stabilizing the composition and maintaining its viscosity, in order to keep the dye composition on the hair during the time of reaction/penetration of the dyes into the keratin fibre and to limit the risks of running onto the face.

It has moreover been recommended to use surfactants, in particular nonionic surfactants, in oxidation dyeing and especially in dyeing products that are in the form of liquids containing oxidation dye precursors to be mixed with oxidizing compositions, liquid compositions in which the proportions of these surfactants are often large. To obtain satisfactory application conditions after mixing these liquid compositions with the oxidizing compositions, especially with a viscosity that is sufficient to prevent running, it most often proves necessary to thicken slightly the said liquid compositions. Unfortunately, the majority of thickening polymers lead to rapid demixing of the composition. Moreover, very often, the viscosity-increasing power of the polymers is very greatly reduced when they are combined with relatively large amounts of surfactants.

One of the aims of the present invention is to obtain a composition for dyeing the hair, which is stable over time and which remains on the hair during application, without running, while at the same time conserving the dyeing properties obtained on the hair, in particular conserving powerful, chromatic and uniform colorations between the end and the root of the same fibre and from one fibre to another.

This aim is achieved by the present invention, one subject of which is a dye composition comprising at least one oxidation dye precursor, at least one polycondensate of ethylene oxide and propylene oxide of the following formula:

H-(0-CH2-CH2)a-(0-CH(CH3)-CH2)b-(0-CH2-CH2)a'-OH,

in which a and a' range from 2 to 150 and b ranges from 1 to 100; and

at least one diol compound comprising 6 carbon atoms, the composition containing not more than 20% fatty substance.

The invention also relates to a hair dyeing process that consists in applying to the fibres the composition of the invention, in the presence of an oxidizing agent.

A subject of the invention is also a two-compartment device containing, in one of the compartments, the composition of the invention as defined above and, in the other compartment, a composition comprising at least one oxidizing agent.

Thus, the invention makes it possible to obtain a thickened composition that is stable over time, which remains in place after application on the hair, without the risk of running. In addition, this composition has improved dyeing properties.

In the description, the term "at least one" associated with an ingredient of the composition is equivalent to "one or more".

The composition according to the invention contains at least one polyethylene glycol/polypropylene glycol/polyethylene glycol triblock polycondensate. In the chemical structure described above, preferably a and a' range from 10 to 130 and b ranges from 20 to 80, better still a and a' range from 50 to 130 and b ranges from 30 to 80 and even better still a and a' range from 80 to 130 and b ranges from 40 to 80. According to one particular embodiment, a and a' are identical.

The polycondensate of ethylene oxide and of propylene oxide that is useful in the composition of the invention preferably has a weight-average molecular weight ranging from 250 to 19 000, better still ranging from 1200 to 15 000, in particular ranging from 1500 to 10 000 and even better still ranging from 1500 to 5000. Advantageously, the said polycondensate of ethylene oxide and propylene oxide has a cloud point, at 10 g/l in distilled water, of greater than or equal to 20°C and preferably of greater than or equal to 60°C. The cloud point is measured according to standard ISO 1065.

As polycondensates of ethylene oxide and propylene oxide that may be used according to the invention, mention may be made of the polyethylene glycol/polypropylene glycol/polyethylene glycol triblock polycondensates sold under the name Synperonic, for instance Synperonic® PE/F32 (INCI name: Poloxamer 108), Synperonic® PE/F108 (INCI name: Poloxamer 338), Synperonic® PE/ L44 (INCI name: Poloxamer 124), Synperonic® PE/L42 (INCI name: Poloxamer 122), Synperonic® PE/F127 (INCI name: Poloxamer 407), Synperonic® PE/F88 (INCI name: Poloxamer 238), Synperonic® PE/L64 (INCI name: Poloxamer 184), Synperonic® PE/F88 (INCI name: Poloxamer 238), Synperonic® PE/F87 (INCI name: Poloxamer 237) from the company Croda, or Lutrol® F68 (INCI name: Poloxamer 188) by the company BASF.

According to one embodiment of the invention, the amount of polycondensates of ethylene oxide and propylene oxide preferably ranges from 0.1 % to 20% by weight, even more preferentially from 0.5% to 10% by weight and better still from 1 % to 5% by weight relative to the total weight of the composition.

The oxidation dyes that are useful in the composition of the invention are generally chosen from oxidation bases and couplers.

Examples of oxidation bases that may be mentioned include para- phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho- aminophenols and heterocyclic bases, and the addition salts thereof.

Among the para-phenylenediamines that may be mentioned, for example, are para- phenylenediamine, para-toluenediamine, 2-chloro-para-phenylenediamine, 2,3-dimethyl- para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para- phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para- phenylenediamine, Ν,Ν-diethyl-para-phenylenediamine, N,N-dipropyl-para- phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis^-hydroxyethyl)-para- phenylenediamine, 4-N,N-bis^-hydroxyethyl)amino-2-methylaniline, 4-N,N-bis - hydroxyethyl)amino-2-chloroaniline, 2^-hydroxyethyl-para-phenylenediamine, 2-fluoro- para-phenylenediamine, 2-isopropyl-para-phenylenediamine, N-^-hydroxypropyl)-para- phenylenediamine, 2-hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3-methyl- para-phenylenediamine, N,N-(ethyl^-hydroxyethyl)-para-phenylenediamine, Ν-(β,γ- dihydroxypropyl)-para-phenylenediamine, N-(4'-aminophenyl)-para-phenylenediamine, N- phenyl-para-phenylenediamine, 2^-hydroxyethyloxy-para-phenylenediamine, 2-β- acetylaminoethyloxy-para-phenylenediamine, N-^-methoxyethyl)-para-phenylenediamine, 4-aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2^-hydroxyethylamino-5- aminotoluene and 3-hydroxy-1-(4'-aminophenyl)pyrrolidine, and the addition salts thereof with an acid. Among the para-phenylenediamines mentioned above, para-phenylenediamine, para-toluenediamine, 2-isopropyl-para-phenylenediamine, 2^-hydroxyethyl-para- phenylenediamine, 2^-hydroxyethyloxy-para-phenylenediamine, 2,6-dimethyl-para- phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-para- phenylenediamine, N,N-bis^-hydroxyethyl)-para-phenylenediamine, 2-chloro-para- phenylenediamine and 2^-acetylaminoethyloxy-para-phenylenediamine, and the addition salts thereof with an acid, are particularly preferred.

Among the bis(phenyl)alkylenediamines that may be mentioned, for example, are N,N'-bis(β-hydroxyethyl)-N,N'-bis(4'-aminophenyl)-1 ,3-diaminopropanol, N,N'-bis - hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis -hydroxyethyl)-N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis(4- methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'- methylphenyl)ethylenediamine and 1 ,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctane, and the addition salts thereof.

Among the para-aminophenols that may be mentioned, for example, are para- aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3-chlorophenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2- hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(β-hydroxyethylaminomethyl)phenol and 4-amino-2-fluorophenol, and the addition salts thereof with an acid.

Among the ortho-aminophenols that may be mentioned, for example, are 2- aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol and 5-acetamido-2- aminophenol, and the addition salts thereof.

Among the heterocyclic bases that may be mentioned, for example, are pyridine derivatives, pyrimidine derivatives and pyrazole derivatives.

Among the pyridine derivatives that may be mentioned are the compounds described, for example, in patents GB 1 026 978 and GB 1 153 196, for instance 2,5- diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine and 3,4-diaminopyridine, and the addition salts thereof.

Other pyridine oxidation bases that are useful in the present invention are the 3- aminopyrazolo[1 ,5-a]pyridine oxidation bases or the addition salts thereof described, for example, in patent application FR 2 801 308. Examples that may be mentioned include pyrazolo[1 ,5-a]pyrid-3-ylamine, 2-acetylaminopyrazolo[1 ,5-a]pyrid-3-ylamine, 2-morpholin- 4-ylpyrazolo[1 ,5-a]pyrid-3-ylamine, 3-aminopyrazolo[1 ,5-a]pyridine-2-carboxylic acid, 2- methoxypyrazolo[1 ,5-a]pyrid-3-ylamine, (3-aminopyrazolo[1 ,5-a]pyrid-7-yl)methanol, 2-(3- aminopyrazolo[1 ,5-a]pyrid-5-yl)ethanol, 2-(3-aminopyrazolo[1 ,5-a]pyrid-7-yl)ethanol, (3- aminopyrazolo[1 ,5-a]pyrid-2-yl)methanol, 3,6-diaminopyrazolo[1 ,5-a]pyridine, 3,4- diaminopyrazolo[1 ,5-a]pyridine, pyrazolo[1 ,5-a]pyridine-3,7-diamine, 7-morpholin-4- ylpyrazolo[1 ,5-a]pyrid-3-ylamine, pyrazolo[1 ,5-a]pyridine-3,5-diamine, 5-morpholin-4- ylpyrazolo[1 ,5-a]pyrid-3-ylamine, 2-[(3-aminopyrazolo[1 ,5-a]pyrid-5-yl)(2- hydroxyethyl)amino]ethanol, 2-[(3-aminopyrazolo[1 ,5-a]pyrid-7-yl)(2- hydroxyethyl)amino]ethanol, 3-aminopyrazolo[1 ,5-a]pyridin-5-ol, 3-aminopyrazolo[1 ,5- a]pyridin-4-ol, 3-aminopyrazolo[1 ,5-a]pyridin-6-ol and 3-aminopyrazolo[1 ,5-a]pyridin-7-ol, and the addition salts thereof.

Among the pyrimidine derivatives that may be mentioned are the compounds described, for example, in the patents DE 2359399; JP 88-169571 ; JP 05-63124; EP 0770375 or patent application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4- hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6- diaminopyrimidine, 2,5,6-triaminopyrimidine and their addition salts and their tautomeric forms, when a tautomeric equilibrium exists.

Among the pyrazole derivatives that may be mentioned are the compounds described in the patents DE 3843892, DE 4133957 and patent applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and DE 195 43 988, such as 4,5-diamino-1-methyl- pyrazole, 4,5-diamino-1-^-hydroxyethyl)pyrazole, 3,4-diaminopyrazole, 4,5-diamino-1-(4'- chlorobenzyl)pyrazole, 4,5-diamino-1 ,3-dimethylpyrazole, 4,5-diamino-3-methyl-1-phenyl- pyrazole, 4,5-diamino-1-methyl-3-phenylpyrazole, 4-amino-1 ,3-dimethyl-5-hydrazino- pyrazole, 1-benzyl-4,5-diamino-3-methylpyrazole, 4,5-diamino-3-tert-butyl-1-methyl- pyrazole, 4,5-diamino-1-tert-butyl-3-methylpyrazole, 4,5-diamino-1-^-hydroxyethyl)-3- methylpyrazole, 4,5-diamino-1-ethyl-3-methylpyrazole, 4,5-diamino-1-ethyl-3-(4'- methoxyphenyl)pyrazole, 4,5-diamino-1-ethyl-3-hydroxymethylpyrazole, 4,5-diamino-3- hydroxymethyl-1-methylpyrazole, 4,5-diamino-3-hydroxymethyl-1-isopropylpyrazole, 4,5- diamino-3-methyl-1-isopropylpyrazole, 4-amino-5-(2'-aminoethyl)amino-1 ,3- dimethylpyrazole, 3,4,5-triaminopyrazole, 1-methyl-3,4,5-triaminopyrazole, 3,5-diamino-1- methyl-4-methylaminopyrazole, 3,5-diamino-4-^-hydroxyethyl)amino-1-methylpyrazole, and the addition salts thereof. 4,5-Diamino-1-^-methoxyethyl)pyrazole may also be used. A 4,5-diaminopyrazole will preferably be used, and even more preferentially 4,5-diamino- 1-^-hydroxyethyl)pyrazole and/or a salt thereof.

Pyrazole derivatives that may also be mentioned include diamino-N,N-dihydro- pyrazolopyrazolones and especially those described in patent application FR-A-2 886 136, such as the following compounds and the addition salts thereof: 2,3-diamino-6,7- dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1-one, 2-amino-3-ethylamino-6,7-dihydro-1 H,5H- pyrazolo[1 ,2-a]pyrazol-1-one, 2-amino-3-isopropylamino-6,7-dihydro-1 H,5H-pyrazolo[1 ,2- a]pyrazol-1-one, 2-amino-3-(pyrrolidin-1-yl)-6,7-dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1- one, 4,5-diamino-1 ,2-dimethyl-1 ,2-dihydropyrazol-3-one, 4,5-diamino-1 ,2-diethyl-1 ,2- dihydropyrazol-3-one, 4,5-diamino-1 ,2-bis(2-hydroxyethyl)-1 ,2-dihydropyrazol-3-one, 2- amino-3-(2-hydroxyethyl)amino-6,7-dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1-one, 2-amino- 3-dimethylamino-6,7-dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1-one, 2,3-diamino-5,6,7,8- tetrahydro-1 H,6H-pyridazino[1 ,2-a]pyrazol-1-one, 4-amino-1 ,2-diethyl-5-(pyrrolidin-1-yl)- 1 ,2-dihydropyrazol-3-one, 4-amino-5-(3-dimethylaminopyrrolidin-1-yl)-1 ,2-diethyl-1 ,2- dihydropyrazol-3-one, 2,3-diamino-6-hydroxy-6,7-dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1- one. 2,3-Diamino-6,7-dihydro-1 H,5H-pyrazolo[1 ,2-a]pyrazol-1-one and/or a salt thereof will preferably be used.

4,5-Diamino-1-^-hydroxyethyl)pyrazole and/or 2,3-diamino-6,7-dihydro-1 H,5H- pyrazolo[1 ,2-a]pyrazol-1-one and/or a salt thereof will preferentially be used as heterocyclic bases.

Among the couplers that are useful, mention may be made especially of meta- phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, and also the addition salts thereof.

Mention may be made, for example, of 1 ,3-dihydroxybenzene, 1 ,3-dihydroxy-2- methylbenzene, 4-chloro-1 ,3-dihydroxybenzene, 2,4-diamino-1-(B-hydroxyethyloxy)- benzene, 2-amino-4-(B-hydroxyethylamino)-1-methoxybenzene, 1 ,3-diaminobenzene, 1 ,3- bis(2,4-diaminophenoxy)propane, 3-ureidoaniline, 3-ureido-1-dimethylaminobenzene, sesamol, 1-B-hydroxyethylamino-3,4-methylenedioxybenzene, oc-naphthol, 2-methyl-1- naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-3- hydroxypyridine, 6-hydroxybenzomorpholine, 3,5-diamino-2,6-dimethoxypyridine, 1-Ν-(β- hydroxyethyl)amino-3,4-methylenedioxybenzene, 2,6-bis(B-hydroxyethylamino)toluene, 6- hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1-H-3-methylpyrazol-5-one, 1-phenyl-3- methylpyrazol-5-one, 2,6-dimethylpyrazolo[1 ,5-b]-1 ,2,4-triazole, 2,6-dimethyl[3,2-c]-1 ,2,4- triazole and 6-methylpyrazolo[1 ,5-a]benzimidazole, the addition salts thereof with an acid, and mixtures thereof.

In general, the addition salts of the oxidation bases and couplers that may be used in the context of the invention are especially selected from the addition salts with an acid such as the hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.

According to one embodiment, the composition comprises at least one oxidation base and optionally a coupler.

The oxidation base(s) each advantageously represent from 0.0001 % to 10% by weight relative to the total weight of the composition, and preferably from 0.005% to 5% by weight relative to the total weight of the composition.

The content of coupler(s), if it is (they are) present, each advantageously represent from 0.0001 % to 10% by weight relative to the total weight of the composition, and preferably from 0.005% to 5% by weight relative to the total weight of the composition.

The composition of the invention contains a diol comprising 6 carbon atoms. For the purposes of the invention, the term "diol comprising 6 carbon atoms" means any hydrocarbon-based compound comprising 2 free hydroxyl functions and 6 carbon atoms.

The diol may be linear or branched and may comprise ether functions.

The diol is chosen, for example, from 1 ,6-hexanediol, dipropylene glycol and hexylene glycol, and mixtures thereof.

Preferably, the diol is chosen from dipropylene glycol and hexylene glycol, and mixtures thereof. Preferably, the weight ratio of diols containing 6 carbon atoms/polycondensate(s) of formula (A) ranges from 0.2 to 20, better still from 1 to 10 and even more preferentially from 1 to 4.

The diol(s) containing 6 carbon atoms may be present in the composition in a content ranging from 0.1% to 20%, preferably from 0.2% to 15% and even more preferably from 0.5% to 10% by weight, relative to the total weight of the composition.

The composition may contain at least one fatty substance, but the amount of fatty substance in the composition may not exceed 20% by weight relative to the total weight of the composition. Preferably, the fatty substance concentration ranges from 0.1 % to 20%, better still from 0.5% to 10% and even better still from 0.5% to 5% of the total weight of the composition.

The term "fatty substance" means an organic compound that is insoluble in water at ordinary temperature (25°C) and at atmospheric pressure (760 mmHg; i.e. 1.013x105 Pa) (solubility of less than 5% and preferably of less than 1%, more preferably still of less than 0.1 %). They have in their structure at least one hydrocarbon-based chain comprising at least 6 carbon atoms or a sequence of at least two siloxane groups. In addition, the fatty substances are soluble in organic solvents under the same temperature and pressure conditions, for instance chloroform, ethanol or benzene.

According to the invention, the fatty substances are chosen from compounds that are liquid or pasty at room temperature and at atmospheric pressure.

More particularly, the fatty substance(s) are chosen from C6-C16 lower alkanes, non-silicone oils of animal, plant or synthetic origin, hydrocarbons of mineral or synthetic origin, fluoro oils, fatty alcohols, fatty acids, esters of a fatty acid and/or of a fatty alcohol, non-silicone waxes and silicones.

It is recalled that, for the purposes of the invention, fatty alcohols, esters and acids more particularly have at least one linear or branched, saturated or unsaturated hydrocarbon-based group comprising 6 to 30 carbon atoms, which is optionally substituted, in particular with one or more hydroxyl groups (in particular 1 to 4). If they are unsaturated, these compounds may comprise one to three conjugated or unconjugated carbon-carbon double bonds.

As regards the lower alkanes, these alkanes comprise from 6 to 16 carbon atoms and are linear or branched, optionally cyclic. Examples that may be mentioned include hexane, dodecane and isoparaffins such as isohexadecane and isodecane.

As non-silicone oils of animal, plant or synthetic origin that may be used in the composition of the invention, examples that may be mentioned include:

- hydrocarbon-based oils of animal origin, such as perhydrosqualene;

- triglyceride oils of plant or synthetic origin, such as liquid fatty acid triglycerides containing from 6 to 30 carbon atoms, for instance heptanoic or octanoic acid triglycerides, or alternatively, for example, sunflower oil, corn oil, soybean oil, marrow oil, grapeseed oil, sesame seed oil, hazelnut oil, apricot oil, macadamia oil, arara oil, castor oil, avocado oil, caprylic/capric acid triglycerides, for instance those sold by the company Stearineries Dubois or those sold under the names Miglyol® 810, 812 and 818 by the company Dynamit Nobel, jojoba oil and shea butter oil;

- linear or branched hydrocarbons of mineral or synthetic origin, containing more than 16 carbon atoms, such as volatile or non-volatile liquid paraffins, and derivatives thereof, petroleum jelly, liquid petroleum jelly, polydecenes, and hydrogenated polyisobutene such as Parleam®;

- fluoro oils, for instance perfluoromethylcyclopentane and perfluoro-1 ,3- dimethylcyclohexane, sold under the names Flutec® PC1 and Flutec® PC3 by the company BNFL Fluorochemicals; perfluoro-1 ,2-dimethylcyclobutane; perfluoroalkanes such as dodecafluoropentane and tetradecafluorohexane, sold under the names PF 5050® and PF 5060® by the company 3M, or bromoperfluorooctyl sold under the name Foralkyl® by the company Atochem; nonafluoromethoxybutane and nonafluoroethoxyisobutane; perfluoromorpholine derivatives such as 4-trifluoromethyl perfluoromorpholine sold under the name PF 5052® by the company 3M.

The fatty alcohols that are suitable for use in the invention are more particularly chosen from linear or branched, saturated or unsaturated alcohols containing from 8 to 30 carbon atoms. Examples that may be mentioned include cetyl alcohol, stearyl alcohol and the mixture thereof (cetylstearyl alcohol), octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol, oleyl alcohol and linoleyl alcohol.

The fatty acids that may be used in the context of the invention are more particularly chosen from saturated or unsaturated carboxylic acids containing from 6 to 30 carbon atoms and in particular from 9 to 30 carbon atoms. They are advantageously chosen from myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid and isostearic acid.

As regards the esters of a fatty acid and/or of a fatty alcohol, which are advantageously different from the triglycerides mentioned above, mention may be made especially of esters of saturated or unsaturated, linear or branched C1-C26 aliphatic mono- or polyacids and of saturated or unsaturated, linear or branched C1-C26 aliphatic mono- or polyalcohols, the total carbon number of the esters being greater than or equal to 10.

Among the monoesters, mention may be made of dihydroabietyl behenate; octyldodecyl behenate; isocetyl behenate; cetyl lactate; C12-C15 alkyl lactate; isostearyl lactate; lauryl lactate; linoleyl lactate; oleyl lactate; (iso)stearyl octanoate; isocetyl octanoate; octyl octanoate; cetyl octanoate; decyl oleate; isocetyl isostearate; isocetyl laurate; isocetyl stearate; isodecyl octanoate; isodecyl oleate; isononyl isononanoate; isostearyl palmitate; methylacetyl ricinoleate; myristyl stearate; octyl isononanoate; 2- ethylhexyl isononanoate; octyl palmitate; octyl pelargonate; octyl stearate; octyldodecyl erucate; oleyl erucate; ethyl and isopropyl palmitates, 2-ethylhexyl palmitate, 2-octyldecyl palmitate, alkyl myristates such as isopropyl, butyl, cetyl, 2-octyldodecyl, myristyl or stearyl myristate, hexyl stearate, butyl stearate, isobutyl stearate; dioctyl malate, hexyl laurate, 2-hexyldecyl laurate.

Still within the context of this variant, esters of C4-C22 dicarboxylic or tricarboxylic acids and of C1-C22 alcohols and esters of monocarboxylic, dicarboxylic or tricarboxylic acids and of C2-C26 dihydroxy, trihydroxy, tetrahydroxy or pentahydroxy alcohols may also be used.

Mention may be made especially of: diethyl sebacate; diisopropyl sebacate; diisopropyl adipate; di-n-propyl adipate; dioctyl adipate; diisostearyl adipate; dioctyl maleate; glyceryl undecylenate; octyldodecyl stearoyl stearate; pentaerythrityl monoricinoleate; pentaerythrityl tetraisononanoate; pentaerythrityl tetrapelargonate; pentaerythrityl tetraisostearate; pentaerythrityl tetraoctanoate; propylene glycol dicaprylate; propylene glycol dicaprate; tridecyl erucate; triisopropyl citrate; triisostearyl citrate; glyceryl trilactate; glyceryl trioctanoate; trioctyldodecyl citrate; trioleyl citrate; propylene glycol dioctanoate; neopentyl glycol diheptanoate; diethylene glycol diisononanoate; and polyethylene glycol distearates.

Among the esters mentioned above, it is preferred to use ethyl, isopropyl, myristyl, cetyl or stearyl palmitate, 2-ethylhexyl palmitate, 2-octyldecyl palmitate, alkyl myristates such as isopropyl, butyl, cetyl or 2-octyldodecyl myristate, hexyl stearate, butyl stearate, isobutyl stearate; dioctyl malate, hexyl laurate, 2-hexyldecyl laurate, isononyl isononanoate or cetyl octanoate.

The composition may also comprise, as fatty ester, sugar esters and diesters of C6- C30 and preferably C12-C22 fatty acids. It is recalled that the term "sugar" means oxygen- bearing hydrocarbon-based compounds containing several alcohol functions, with or without aldehyde or ketone functions, and which comprise at least 4 carbon atoms. These sugars may be monosaccharides, oligosaccharides or polysaccharides.

Examples of suitable sugars that may be mentioned include sucrose (or saccharose), glucose, galactose, ribose, fucose, maltose, fructose, mannose, arabinose, xylose and lactose, and derivatives thereof, especially alkyl derivatives, such as methyl derivatives, for instance methylglucose.

The sugar esters of fatty acids may be chosen especially from the group comprising the esters or mixtures of esters of sugars described previously and of linear or branched, saturated or unsaturated C6-C30, and preferably C12-C22 fatty acids. If they are unsaturated, these compounds may comprise one to three conjugated or unconjugated carbon-carbon double bonds.

The esters according to this variant may also be selected from monoesters, diesters, triesters, tetraesters and polyesters, and mixtures thereof.

These esters may be, for example, oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates and arachidonates, or mixtures thereof such as, especially, oleopalmitate, oleostearate and palmitostearate mixed esters. More particularly, use is made of monoesters and diesters and especially sucrose, glucose or methylglucose monooleates or dioleates, stearates, behenates, oleopalmitates, linoleates, linolenates and oleostearates.

An example that may be mentioned is the product sold under the name Glucate® DO by the company Amerchol, which is a methylglucose dioleate.

Examples of esters or mixtures of esters of sugar and of fatty acid that may also be mentioned include:

-the products sold under the names F160, F140, F110, F90, F70 and SL40 by the company Crodesta, respectively denoting sucrose palmitostearates formed from 73% monoester and 27% diester and triester, from 61 % monoester and 39% diester, triester and tetraester, from 52% monoester and 48% diester, triester and tetraester, from 45% monoester and 55% diester, triester and tetraester, from 39% monoester and 61 % diester, triester and tetraester, and sucrose monolaurate;

-the products sold under the name Ryoto Sugar Esters, for example referenced B370 and corresponding to sucrose behenate formed from 20% monoester and 80% diester, triester and polyester;

-the sucrose monodipalmitostearate sold by the company Goldschmidt under the name Tegosoft® PSE.

The (non-silicone) wax(es) are chosen in particular from carnauba wax, candelilla wax, esparto wax, paraffin wax, ozokerite, vegetable waxes, such as olive tree wax, rice wax, hydrogenated jojoba wax or absolute flower waxes, such as the blackcurrant flower essential wax sold by Bertin (France), or animal waxes, such as beeswaxes or modified beeswaxes (cerabellina); other waxes or waxy raw materials which can be used according to the invention are in particular marine waxes, such as that sold by Sophim under the reference M82, polyethylene waxes or polyolefin waxes in general.

The silicones that may be used in the cosmetic compositions of the present invention are volatile or nonvolatile, cyclic, linear or branched silicones, which are unmodified or modified with organic groups, having a viscosity from 5x 10-6 to 2.5 m2/s at 25°C, and preferably 1 x 10-5 to 1 m2/s.

The silicones that may be used in accordance with the invention may be in the form of oils, waxes, resins or gums.

Preferably, the silicone is chosen from polydialkylsiloxanes, especially polydimethylsiloxanes (PDMS), and organomodified polysiloxanes comprising at least one functional group chosen from poly(oxyalkylene) groups, amino groups and alkoxy groups.

Organopolysiloxanes are defined in greater detail in Walter Noll's "Chemistry and

Technology of Silicones" (1968), Academic Press. They may be volatile or non-volatile.

When they are volatile, the silicones are more particularly chosen from those having a boiling point of between 60°C and 260°C, and even more particularly from:

cyclic polydialkylsiloxanes containing from 3 to 7 and preferably from 4 to 5 silicon atoms. These are, for example, octamethylcyclotetrasiloxane sold in particular under the name Volatile Silicone® 7207 by Union Carbide or Silbione® 70045 V2 by Rhodia, decamethylcyclopentasiloxane sold under the name Volatile Silicone® 7158 by Union Carbide, and Silbione® 70045 V5 by Rhodia, and mixtures thereof.

Mention may also be made of cyclocopolymers of the dimethylsiloxane/methylalkylsiloxane type, such as Volatile Silicone® FZ 3109 sold by the company Union Carbide, of formula:

D" - D' D" - D'

CH, ' ' CH ₃

I I

with D' : _{ivec D} " . — Si -O— with D' : _ave c D' : - Si -O—

CH ₃ C ₈ H ₁₇

Mention may also be made of mixtures of cyclic polydialkylsiloxanes with organosilicon compounds, such as the mixture of octamethylcyclotetrasiloxane and tetratrimethylsilylpentaerythritol (50/50) and the mixture of octamethylcyclotetrasiloxane and oxy-1 ,1 '-bis(2,2,2',2',3,3'-hexatrimethylsilyloxy)neopentane;

(ii) linear volatile polydialkylsiloxanes containing 2 to 9 silicon atoms and having a viscosity of less than or equal to 5x10-6 m2/s at 25°C. An example is decamethyltetrasiloxane sold in particular under the name SH 200 by the company Toray Silicone. Silicones belonging to this category are also described in the article published in Cosmetics and Toiletries, Vol. 91 , Jan. 76, pp. 27-32, Todd & Byers, Volatile Silicone Fluids for Cosmetics.

Non-volatile polydialkylsiloxanes, polydialkylsiloxane gums and resins, polyorganosiloxanes modified with the organofunctional groups above, and mixtures thereof, are preferably used.

These silicones are more particularly chosen from polydialkylsiloxanes, among which mention may be made mainly of polydimethylsiloxanes containing tnmethylsilyl end groups. The viscosity of the silicones is measured at 25°C according to ASTM standard 445 Appendix C.

Among these polydialkylsiloxanes, mention may be made, in a nonlimiting manner, of the following commercial products:

- the Silbione® oils of the 47 and 70 047 series or the Mirasil® oils sold by Rhodia, for instance the oil 70 047 V 500 000;

- the oils of the Mirasil® series sold by the company Rhodia;

- the oils of the 200 series from the company Dow Corning, such as DC200 with a viscosity of 60 000 mm2/s;

- the Viscasil® oils from General Electric and certain oils of the SF series (SF 96, SF 18) from General Electric.

Mention may also be made of polydimethylsiloxanes containing dimethylsilanol end groups known under the name dimethiconol (CTFA), such as the oils of the 48 series from the company Rhodia.

In this category of polydialkylsiloxanes, mention may also be made of the products sold under the names Abil Wax® 9800 and 9801 by the company Goldschmidt, which are poly(C1-C20)dialkylsiloxanes. The silicone gums that can be used in accordance with the invention are especially polydialkylsiloxanes and preferably polydimethylsiloxanes with high number-average molecular weights of between 200 000 and 1 000 000, used alone or as a mixture in a solvent. This solvent can be chosen from volatile silicones, polydimethylsiloxane (PDMS) oils, polyphenylmethylsiloxane (PPMS) oils, isoparaffins, polyisobutylenes, methylene chloride, pentane, dodecane and tridecane, or mixtures thereof.

Products that can be used more particularly in accordance with the invention are mixtures such as:

- mixtures formed from a polydimethylsiloxane hydroxylated at the chain end, or dimethiconol (CTFA) and from a cyclic polydimethylsiloxane also known as cyclomethicone (CTFA), such as the product Q2 1401 sold by the company Dow Corning;

- mixtures formed from a polydimethylsiloxane gum with a cyclic silicone, such as the product SF 1214 Silicone Fluid from the company General Electric; this product is an SF 30 gum corresponding to a dimethicone, having a number-average molecular weight of 500 000, dissolved in the oil SF 1202 Silicone Fluid corresponding to decamethylcyclopentasiloxane;

- mixtures of two PDMSs with different viscosities, and more particularly of a PDMS gum and a PDMS oil, such as the product SF 1236 from the company General Electric. The product SF 1236 is a mixture of a gum SE 30 defined above with a viscosity of 20 m ² /s and of an oil SF 96 with a viscosity of 5x 10-6 m ² /s. This product preferably comprises 15% of gum SE 30 and 85% of an oil SF 96.

The organopolysiloxane resins that can be used in accordance with the invention are crosslinked siloxane systems containing the following units:

R2Si02/2, R3Si01/2, RSi03/2 and Si04/2

in which R represents an alkyl containing 1 to 16 carbon atoms. Among these products, the ones that are particularly preferred are those in which R denotes a C1 -C4 lower alkyl group, more particularly methyl.

Among these resins, mention may be made of the product sold under the name Dow Corning 593 or those sold under the names Silicone Fluid SS 4230 and SS 4267 by the company General Electric, which are silicones of dimethyl/trimethylsiloxane structure.

Mention may also be made of the trimethyl siloxysilicate type resins sold in particular under the names X22-4914, X21-5034 and X21-5037 by the company Shin-Etsu.

The organomodified silicones that can be used in accordance with the invention are silicones as defined above and comprising in their structure one or more organofunctional groups attached via a hydrocarbon-based group.

Besides the silicones described above, the organomodified silicones may be polydiarylsiloxanes, especially polydiphenylsiloxanes, and polyalkylarylsiloxanes functionalized with the organofunctional groups mentioned previously.

The polyalkylarylsiloxanes are chosen particularly from linear and/or branched polydimethyl/methylphenylsiloxanes and polydimethyl/diphenylsiloxanes with a viscosity of from 1 10-5 to 5x 10-2 m ² /s at 25°C. Among these polyalkylarylsiloxanes, examples that may be mentioned include the products sold under the following names:

. the Silbione® oils of the 70 641 series from Rhodia;

. the oils of the series Rhodorsil® 70 633 and 763 from Rhodia;

. the oil Dow Corning 556 Cosmetic Grade Fluid from Dow Corning;

. the silicones of the PK series from Bayer, such as the product PK20;

- the silicones of the PN and PH series from Bayer, such as the products PN1000 and PH 1000;

. certain oils of the SF series from General Electric, such as SF 1023, SF 1 154, SF 1250 and SF 1265.

Among the organomodified silicones, mention may be made of polyorganosiloxanes comprising:

- polyethyleneoxy and/or polypropyleneoxy groups optionally comprising C6-C24 alkyl groups, such as the products known as dimethicone copolyol sold by the company Dow Corning under the name DC 1248 or the oils Silwet® L 722, L 7500, L 77 and L 711 by the company Union Carbide, and the (C12)alkylmethicone copolyol sold by the company Dow Corning under the name Q2 5200;

- substituted or unsubstituted amine groups, such as the products sold under the name GP 4 Silicone Fluid and GP 7100 by the company Genesee, or the products sold under the names Q2 8220 and Dow Corning 929 or 939 by the company Dow Corning. The substituted amine groups are, in particular, C1-C4 aminoalkyl groups;

- alkoxy groups such as the product sold under the name Silicone Copolymer F- 755 by SWS Silicones, and Abil Wax® 2428, 2434 and 2440 by the company Goldschmidt.

More particularly, the fatty substances are chosen from compounds that are liquid or pasty at room temperature and at atmospheric pressure.

Preferably, the fatty substance is a compound that is liquid at a temperature of 25°C and at atmospheric pressure.

The fatty substances are preferably chosen from C6-C16 lower alkanes, fatty alcohols, fatty acid esters, fatty alcohol esters, oils, in particular non-silicone mineral, plant or synthetic oils, hydrocarbons of mineral or synthetic origin, and silicones. According to an even more preferred variant, the fatty substance(s) are chosen from C6-C16 lower alkanes, non-silicone oils of synthetic origin, hydrocarbons of mineral or synthetic origin, and fatty alcohols, or mixtures thereof.

Preferably, the fatty substance is chosen from liquid petroleum jelly, polydecenes and liquid fatty alcohols, or mixtures thereof.

The composition according to the invention may optionally comprise synthetic or natural direct dyes, chosen from ionic or nonionic species, preferably cationic or nonionic species. Examples of suitable direct dyes that may be mentioned include azo dyes; methine dyes; carbonyl dyes; azine dyes; nitro (hetero)aryl dyes; tri(hetero)arylmethane dyes; porphyrin dyes; phthalocyanine dyes, and natural direct dyes, alone or as mixtures.

Among the natural direct dyes that may be used according to the invention, mention may be made of lawsone, juglone, alizarin, purpurin, carminic acid, kermesic acid, purpurogallin, protocatechaldehyde, indigo, isatin, curcumin, spinulosin, apigenidin and orceins. Extracts or decoctions containing these natural dyes and in particular henna- based poultices or extracts, may also be used.

When they are present, the direct dye(s) more particularly represent from 0.0001 % to 10% by weight and preferably from 0.005% to 5% by weight of the total weight of the composition.

The medium that is suitable for dyeing, also known as the dye support, generally comprises water or a mixture of water and of one or more organic solvents, which may be the C6 diols of the invention or organic solvents other than these diols, for example C1-C4 lower alkanols such as ethanol and isopropanol, polyols other than the diol defined previously, for instance propylene glycol and glycerol, and polyol ethers, for instance dipropylene glycol monomethyl ether.

According to one particular embodiment, the composition of the invention comprises a C1-C4 aliphatic alcohol, especially ethanol or isopropanol.

These additional solvents are generally present in proportions that may be between 1 % and 40% by weight approximately and even more preferentially between 3% and 30% by weight approximately relative to the total weight of the dye composition.

The dye composition in accordance with the invention may also contain various adjuvants conventionally used in hair dye compositions, such as anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof, anionic, cationic, nonionic, amphoteric or zwitterionic polymers or mixtures thereof, mineral thickeners such as silicates or organic thickeners, and in particular anionic, cationic, nonionic and amphoteric polymeric associative thickeners, antioxidants, penetrants, sequestrants, fragrances, buffers, dispersants, conditioning agents, for instance volatile or non-volatile, modified or unmodified silicones, film-forming agents, ceramides, preserving agents and opacifiers.

The above adjuvants are generally present in an amount, for each of them, of between 0.01 % and 20% by weight relative to the weight of the composition.

Needless to say, a person skilled in the art will take care to select this or these optional additional compound(s) such that the advantageous properties intrinsically associated with the oxidation dye composition in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s).

The pH of the dye composition in accordance with the invention is generally between 5 and 1 approximately and preferably greater than 5. According to one particular embodiment, the pH is between 6 and 1 1 approximately. It may be adjusted to the desired value by means of acidifying or basifying agents usually used in the dyeing of keratin fibres, or alternatively using standard buffer systems.

Among the acidifying agents that may be mentioned, for example, are mineral or organic acids, for instance hydrochloric acid, orthophosphoric acid or sulfuric acid, carboxylic acids, for instance acetic acid, tartaric acid, citric acid and lactic acid, and sulfonic acids.

Mention may be made, among the basifying agents, by way of example, of aqueous ammonia, alkaline carbonates, alkanolamines, such as mono-, di- and triethanolamines, and their derivatives, sodium hydroxide, potassium hydroxide and the compounds with the following formula:

N W N

/ \

Rc ^R d

in which W is a propylene residue optionally substituted with a hydroxyl group or a C1-C4 alkyl radical; Ra, Rb, Rc and Rd, which may be identical or different, represent a hydrogen atom or a C1-C4 alkyl or C1-C4 hydroxyalkyl radical.

Advantageously, the composition according to the invention has a content of basifying agent(s) ranging from 0.01 % to 30% by weight and preferably from 0.1 % to 20% by weight relative to the weight of the composition.

According to one embodiment, the composition comprises at least one alkaline agent.

The composition according to the invention may comprise one or more oxidizing agents. Conventionally, the oxidizing agent is added to the composition at the time of use.

More particularly, the oxidizing agent(s) are chosen from hydrogen peroxide, urea peroxide, alkali metal bromates or ferricyanides, peroxygenated salts, for instance alkali metal or alkaline-earth persulfates, perborates and percarbonates, and also peracids and precursors thereof.

Advantageously, the oxidizing agent is hydrogen peroxide.

The content of oxidizing agent(s) more particularly represents from 0.1 % to 20% by weight and preferably from 0.5% to 10% by weight relative to the weight of the composition.

Preferably, the oxidizing agent is hydrogen peroxide in aqueous solution, the concentration of which ranges, more particularly, from 0.1 % to 50% by weight, more particularly between 0.5% and 20% by weight and even more preferentially between 1 % and 15% by weight relative to the weight of the oxidizing composition.

Preferably, the composition of the invention before mixing with the oxidizing agent is in liquid form at a temperature of 25°C and at atmospheric pressure (760 mmHg), i.e. it is capable of flowing under the action of its own weight.

Preferably, the viscosity at a temperature of 25°C and at a shear rate of 1 s-1 of the composition of the invention before mixing with the oxidizing composition is between 10-2 Pa.s and 5 Pa.s and preferably between 10-1 Pa.s and 2 Pa.s. It may be measured using a Thermo Haake RS600 rheometer with cone-plate geometry or an equivalent machine.

Preferably, the composition of the invention before mixing with the oxidizing agent contains a total amount of ionic or nonionic surfactants of greater than 8% and even more preferentially greater than 10%.

The dyeing process according to the invention thus consists in mixing a composition free of oxidizing agent, comprising at least one dye precursor, at least one polycondensate of polyethylene and polypropylene as defined previously, at least one diol comprising 6 carbon atoms, and optionally an alkaline agent, with a composition comprising an oxidizing agent, and in applying this composition to wet or dry human keratin fibres.

The composition is then left in place for a time usually ranging from one minute to one hour and preferably from 5 minutes to 30 minutes.

The temperature during the process is conventionally between room temperature (between 15 and 25°C) and 80°C and preferably between room temperature and 60°C.

After the treatment, the human keratin fibres are optionally rinsed with water, optionally washed with a shampoo and then rinsed with water, before being dried or left to dry. EXAMPLES

The following compositions were prepared:

Composition A % by weight (AM)

1 ,4-Diaminobenzene 0.36

2-Methyl-1 ,3-dihydroxybenzene 0.15

1 ,3-Dihydroxybenzene 0.77

6-Hydroxyindole 0.07

1-Hydroxy-3-aminobenzene 0.41

Rapeseed fatty acid amide 4 OE 8.12

(PEG-4 rapeseed amide)

Decyl alcohol 3 OE (Deceth-3) 6.93

Monoglycerolated lauryl alcohol 7

(glyceryl lauryl ether)

Oleyl alcohol (oil according to the 1.1

invention)

Laureth-5 carboxylic acid 4.5

Ethanolamine 3.66

EDTA 0.2 Ethanol 8.2

Propylene glycol 6.2

Hexylene glycol 3

Dipropylene glycol 3

POE/POP/POE (Poloxamer 338 2 sold by BASF; a=a'=128 b=54)

Polyquaternium-6 ( polydimethyl- 1.36 diallylammonium chloride)

Ammonium thiolactate 0.464

Erythorbic acid 0.12

Ammonium hydroxide 2.88

Water qs 100

Composition B % by weight (AM)

1 ,4-Diaminobenzene 0.36

2-Methyl-1 ,3-dihydroxybenzene 0.15

1 ,3-Dihydroxybenzene 0.77

6-Hydroxyindole 0.07

1-Hydroxy-3-aminobenzene 0.41

Rapeseed fatty acid amide 4 OE 8.12 (PEG-4 rapeseed amide)

Decyl alcohol 3 OE (Deceth-3) 6.93

Monoglycerolated lauryl alcohol 7 (glyceryl lauryl ether)

Oleyl alcohol (oil according to the 1.1 invention)

Laureth-5 carboxylic acid 4.5

Ethanolamine 5.66

EDTA 0.2

Ethanol 8.2

Propylene glycol 6.2

Hexylene glycol 3

Dipropylene glycol 3

POE/POP/POE (Poloxamer 338 2 sold by BASF; a=a'=128 b=54)

Polyquaternium-6 1.36

Thiolactic acid 0.251

Erythorbic acid 0.12

Water qs 100 Composition C % by weight (AM)

1 ,4-Diaminobenzene 0.36

2-Methyl-1 ,3-dihydroxybenzene 0.15

1 ,3-Dihydroxybenzene 0.77

6-Hydroxyindole 0.07

1-Hydroxy-3-aminobenzene 0.41

Rapeseed fatty acid amide 4 OE 8.12

(PEG-4 rapeseed amide)

Decyl alcohol 3 OE (Deceth-3) 6.93

Monoglycerolated lauryl alcohol 7

(glyceryl lauryl ether)

Oleyl alcohol (oil according to the 1.1

invention)

Laureth-5 carboxylic acid 4.5

Ethanolamine 5.66

EDTA 0.2

Ethanol 8.2

Propylene glycol 6.2

Hexylene glycol 6

POE/POP/POE (Poloxamer 338 2

sold by BASF; a=a'=128 b=54)

Polyquaternium-6 1.36

Thiolactic acid 0.251

Erythorbic acid 0.12

Water qs 100

Compositions A, B and C are stable over time. Each of them is mixed with 1.5 times its own weight of an oxidizing composition comprising 7.5% hydrogen peroxide at pH 2.

The mixtures obtained apply easily to dark chestnut-brown hair, without running. After a leave-on time of 30 minutes at 25°C followed by rinsing, the hair is washed and dried. The head of hair is then uniformly dyed in a strong golden light chestnut-brown colour with the two mixtures obtained from compositions A, B and C.