Dye composition using at least one oxidation base and at least one aminobenzene coupler, processes and device

The present invention relates to a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising one or more oxidation bases and one or more particular aminobenzene couplers.

The invention also relates to a process for dyeing keratin fibres using said composition in the presence of one or more chemical oxidizing agents, and to a multi-compartment device suitable for using said composition.

Many people have sought for a long time to modify the colour of their hair and in particular to mask their grey hair.

It is known practice to dye keratin fibres, in particular human keratin fibres such as the hair, to obtain "permanent" colourings with dye compositions containing oxidation dye precursors, which are generally known as oxidation bases, such as ortho- or para-phenylenediamines, ortho- or para-aminophenols, or heterocyclic compounds such as pyrazoles, pyrazolinones or pyrazolo-pyridines. These oxidation bases are colourless or weakly coloured compounds, which, when combined with oxidizing products, may give rise to coloured compounds via a process of oxidative condensation.

It is also known that the shades obtained with these oxidation bases may be varied by combining them with couplers or colour modifiers, the latter being chosen especially from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds such as indole or pyridine compounds. The variety of molecules used as oxidation bases and couplers allows a wide range of colours to be obtained.

The oxidation dyeing process thus consists in applying to keratin fibres a dye composition comprising oxidation bases or a mixture of oxidation bases and couplers with hydrogen peroxide (H ₂ 0 ₂ or aqueous hydrogen peroxide solution), as oxidizing agent, in leaving it to diffuse, and then in rinsing the fibres.

However, the use of these dye compositions still has a certain number of drawbacks. Specifically, after application to keratin fibres, the dyeing power obtained may not be entirely satisfactory, or may even be weak, and lead to a restricted range of colours. The colourings may also be insufficiently persistent with respect to external agents such as light, shampoo or perspiration, and may also be too selective, i.e. the difference in colouring is too great along the same keratin fibre that is differently sensitized between its end and its root. Moreover, meta-phenylenediamine and meta-aminophenol couplers are highly reactive molecules that may lead to problems in terms of toxicological profile. The introduction of an electron- withdrawing group makes it possible to reduce the inherent reactivity of this structure, but generally has an impact on the dyeing performance.

Thus, there is a real need to provide a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, which does not have the drawbacks mentioned above, i.e. which is especially capable of leading to a wide range of shades with powerful, sparingly selective colourings that are resistant to external agents such as shampoo, light or perspiration.

This aim is achieved by the present invention, one subject of which is especially a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising:

(i) at least one oxidation base,

(ii) at least one aminobenzene coupler of formula (I), and also addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof:

in which formula (I):

• A represents an electron-withdrawing group preferably chosen from the groups -C(0)-ORi , -S0 ₃ H and -CN,

• Ri represents a hydrogen atom, an alkali metal, an ammonium group or a linear or branched, optionally substituted Ci-Cs alkyl group; preferably, Ri represents a hydrogen atom,

• R ₂ and R ₃ , which may be identical or different, represent a hydrogen atom, a halogen atom, a linear or branched, optionally substituted Ci-Cs alkyl group, or a linear or branched, optionally substituted Ci-Cs alkoxy group,

- R4 represents a hydroxyl group-OH or a group -NR ₅ R ₀ ,

• R5 and R6, which may be identical or different, represent:

• a hydrogen atom or a linear or branched Ci-Cs alkyl group, which is optionally substituted, preferably with one or more hydroxyl groups and/or interrupted with one or more heteroatoms such as oxygen, or alternatively

• R5 and R6 form, together with the nitrogen atom to which they are attached, a saturated or unsaturated, preferably saturated, 5- to 8- membered heterocycle, optionally substituted with one or more Ci- C ₄ alkyl groups; said heterocycle possibly containing one or more heteroatoms such as those chosen from nitrogen and oxygen, preferably oxygen;

• R ₇ and R8, which may be identical or different, represent a hydrogen atom or a linear or branched C1-C4 alkyl group.

The dye compositions make it possible to lead to powerful, sparingly selective colourings that are resistant to external agents (such as shampoo, light, perspiration or bad weather).

Moreover, the dye compositions according to the present invention make it possible to achieve a wide range of colours with varied shades.

In particular, the compositions in accordance with the invention make it possible to lead to satisfactory colour build-up, especially on depigmented keratin fibres, such as grey hair.

For the purposes of the present invention, the term "build-up" of the colour of keratin fibres means the variation in colouring between locks of undyed grey hair and locks of dyed hair.

Other subjects, characteristics, aspects and advantages of the present invention will emerge even more clearly on reading the description and the examples that follow.

In the text hereinbelow, and unless otherwise indicated, the limits of a range of values are included within that range.

The expression "at least one" is equivalent to the expression "one or more". The term "dye composition" means the composition comprising at least one oxidation dye and at least one coupler of formula (I) as defined previously and hereinbelow.

The term "electron-withdrawing" group means a group that is electron- withdrawing via an inductive effect -I and/or via a mesomeric effect -M; mention may be made of halogen atoms, the groups -C(Hal) ₃ , -P(0)(OR) ₂ , -0-P(0)(OR) ₂ , - C(0)-OR, -S0 ₃ R, -N0 ₂ and -CN with Hal, which may be identical or different, representing a halogen atom, R representing a hydrogen atom, an alkali metal or an alkaline-earth metal, an optionally substituted (Ci-Cs)alkyl group, an aryl group such as phenyl or an aryl(Ci-C4)alkyl group such as benzyl.

The term "ready-to-use composition" means the dye composition which also comprises at least one chemical oxidizing agent.

Couplers of formula (I):

As indicated above, the dye composition according to the invention comprises one or more aminobenzene couplers corresponding to formula (I), and also the addition salts thereof, optical isomers, geometrical isomers and tautomers thereof and/or solvates thereof:

in which formula (I):

• A represents an electron-withdrawing group preferably chosen from the groups -C(0)-ORi, -S0 ₃ H and -CN,

· Ri represents a hydrogen atom, an alkali metal, an ammonium group or a linear or branched, optionally substituted Ci-Cs alkyl group; preferably, Ri represents a hydrogen atom,

• R ₂ and R ₃ , which may be identical or different, represent a hydrogen atom, a halogen atom, a linear or branched, optionally substituted Ci-Cs alkyl group, or a linear or branched, optionally substituted Ci-Cs alkoxy group, • R4 represents a hydroxyl group -OH or a group -NR ₅ R ₀ ,

• R5 and R ₆ , which may be identical or different, represent:

^■ a hydrogen atom or a linear or branched Ci-Cs alkyl group, which is optionally substituted, preferably with one or more hydroxyl groups and/or interrupted with one or more heteroatoms such as an oxygen atom, or alternatively

^■ R5 and R ₆ form, together with the nitrogen atom to which they are attached, a saturated or unsaturated, preferably saturated, 5- to 8- membered heterocycle, optionally substituted with one or more C ₁ -C ₄ alkyl groups; said heterocycle possibly containing one or more heteroatoms such as those chosen from nitrogen and oxygen, preferably oxygen;

• R ₇ and R ₈ , which may be identical or different, represent a hydrogen atom or a linear or branched C ₁ -C ₄ alkyl group.

According to a particular embodiment of the invention, A is an electron- withdrawing group located in the para position relative to the amino group -NR ₇ R ₈ .

According to a particular embodiment of the invention, A is an electron- withdrawing group located in the ortho position relative to the amino group -NR ₇ R ₈ .

According to another particular embodiment of the invention, A is an electron-withdrawing group located in the meta position relative to the amino group - NR ₇ R ₈ .

According to a particular embodiment of the invention, A is an electron- withdrawing group chosen from the groups -C(0)ORi and -SO ₃ H and located in the para or ortho position relative to the amino group -NR ₇ R ₈ .

According to one embodiment, Ri represents a hydrogen atom.

Preferably, R ₂ and R ₃ , which may be identical or different, represent:

- a hydrogen atom,

- a chlorine atom,

- a linear or branched C ₁ -C ₄ and especially Ci alkyl group,

- a linear or branched C ₁ -C ₄ and preferably Ci alkoxy group.

Preferentially, R ₂ and R ₃ represent a hydrogen atom.

According to one embodiment, R4 represents a hydroxyl group -OH. In accordance with this embodiment, A is preferentially a -C(0)OH group located in the meta or ortho position relative to the amino group -NR ₇ R ₈ .

According to another embodiment, R ₄ represents a group -NR ₅ R ₀ .

Preferably, R ₅ and R^, which may be identical or different, represent a hydrogen atom or a linear or branched C ₁ -C ₄ alkyl group, especially a methyl group, optionally substituted with a hydroxyl group or interrupted with an oxygen atom.

As a variant, R5 and R ₆ may form, together with the nitrogen atom to which they are attached, a saturated 5- or 6-membered heterocycle, optionally substituted with a C ₁ -C ₄ alkyl radical, said heterocycle possibly containing another heteroatom chosen from oxygen.

In accordance with this embodiment, A is preferentially a group chosen from -C(0)OH and -S(0) ₂ OH groups and is located in the para or ortho position relative to the amino group -NR7R8.

In particular, in this embodiment, A is preferentially located in the para position relative to the amino group -NR ₇ R ₈ .

In another variant of this embodiment, A is a group chosen from -C(0)OH and SO ₃ H groups located in the meta position relative to the amino group -NR ₇ R ₈ .

Preferentially, R5 and R ₆ represent a hydrogen atom.

According to one embodiment, R7 and Rs represent a hydrogen atom.

Preferably, the aminobenzene couplers of formula (I) are chosen from the compounds of formulae (I A) and (IB):

in which formulae (IA) and (IB) the radicals A, R ₂ , R3, R ₄ , R ₅ and R ₆ have the same meanings as those described previously in formula (I).

Preferably, in formulae (IA) and (IB), A represents an electron-withdrawing group chosen from -C(0)OH and -S(0) ₂ OH groups.

The aminobenzene coupler(s) of formulae (I), (IA) and (IB) are chosen especially from the following compounds, and also the addition salts thereof, optical isomers thereof, geometrical isomers thereof, tautomers thereof, solvates thereof and mixtures thereof:

2,4-diamino-5-methoxybenzoic acid

2,4-diamino-5-chlorobenzoic acid

2-amino-4- (dimethylamino)benzoic acid

2-amino-4-(dimethylamino)-6- ethylbenzoic acid

4-amino-2-[(2- hydroxyethyl)(methyl)amino]be nzoic acid

4-amino-2-[(2- methoxyethyl)amino]benzoic acid 4-amino-2-(3-methylpyrrolidin- l-yl)benzoic acid

4-amino-2-(morpholin-4- yl)benzoic acid

2-amino-4-morpholin-4- yl)benzoic acid

3,5-diaminobenzoic acid

3-amino-5- (methylamino)benzoic acid

3,5-diamino-2-methylb

acid

According to a preferred embodiment, in formulae (I A) and (IB):

- A represents an electron-withdrawing group chosen from -COOH and - SO ₃ H groups

- R ₂ and R3 represent a hydrogen atom

- R4 represents a hydroxy 1 group -OH or an NH ₂ group.

Preferably, the aminobenzene coupler(s) are chosen from compounds (1), (2), (3), (4), (5) and (35) as defined above, and also the addition salts thereof, the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the solvates thereof, and mixtures thereof.

The addition salts of the compounds of formulae (I), (IA) and (IB) are especially chosen from addition salts with an acid, such as hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, dodecylbenzenesulfonates, phosphates and acetates, and preferably the hydrochlorides, citrates, succinates, tartrates, phosphates and lactates.

Moreover, the solvates of the compounds of formulae (I), (IA) and (IB) more particularly represent the hydrates of said compounds and/or the combination of said compounds with a linear or branched C1 -C4 alcohol such as methanol, ethanol, isopropanol or n-propanol. Preferably, the solvates are hydrates.

The content of the aminobenzene coupler(s) of formula (I), (IA) or (IB) present in the composition according to the invention preferably ranges from 0.0001% to 10% by weight and more preferentially ranges from 0.005% to 5% by weight relative to the total weight of the composition containing them. Oxidation bases

The composition of the invention comprises one or more oxidation bases chosen especially from heterocyclic bases and benzene-based bases, and the addition salts thereof and/or the solvates thereof.

The benzene-based oxidation bases according to the invention are particularly chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols, and the addition salts thereof and/or the solvates thereof. The para-phenylenediamines that may be mentioned include 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(P-hydroxyethyl)amino-2-chloroaniline, 2- -hydroxyethyl-para- phenylenediamine, 2-methoxymethyl-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-ethyl-N-( -hydroxyethyl)-para- phenylenediamine, Ν-(β ,y-dihydroxypropyl)-para-phenylenediamine, N-(4 ' - aminophenyl)-para-phenylenediamine, N-phenyl-para-phenylenediamine, 2-β- hydroxyethyloxy-para-phenylenediamine, 2- -acetylaminoethyloxy-para- phenylenediamine, N-( -methoxyethyl)-para-phenylenediamine, 4- aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2- -hydroxyethylamino- 5-aminotoluene and 3-hydroxy-l-(4'-aminophenyl)pyrrolidine, and the corresponding addition salts with an acid.

Among the para-phenylenediamines mentioned above, para- phenylenediamine, para-toluenediamine, 2-isopropyl-para-phenylenediamine, 2-β- 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 corresponding addition salts with an acid, are particularly preferred.

Among the bis(phenyl)alkylenediamines that may be mentioned, for example, are N,N'-bis( -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, Ν,Ν'- 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 corresponding addition salts.

Among the para-aminophenols that are mentioned are, for example, 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- amino methylphenol, 4-amino-2-( -hydroxyethyl-aminomethyl)phenol and 4-amino-2- fluorophenol, and the corresponding addition salts 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 corresponding addition salts.

Among the heterocyclic bases that may be mentioned, for example, are pyridine, pyrimidine 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 example 2,5- diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine and 3,4- diaminopyridine, and the corresponding addition salts.

Other pyridine oxidation bases that are useful in the present invention are the 3-aminopyrazolo[l,5-a]pyridine oxidation bases or the corresponding addition salts described, for example, in patent application FR 2 801 308. Examples that may be mentioned include pyrazolo[l,5-a]pyrid-3-ylamine, 2-acetylaminopyrazolo[l,5- a]pyrid-3-ylamine, 2-(morpholin-4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, 3- aminopyrazo lo [ 1 ,5 -a]pyridine-2-carboxylic acid, 2-methoxypyrazo lo [ 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[l ,5-a]pyrid-2-yl)methanol, 3,6-diaminopyrazolo[ 1 ,5-a]pyridine, 3,4- diaminopyrazolo[l,5-a]pyridine, pyrazolo[l,5-a]pyridine-3,7-diamine, 7-(morpholin-4- yl)pyrazolo[ 1 ,5-a]pyrid-3-ylamine, pyrazolo[ 1 ,5-a]pyridine-3,5-diamine, 5-(morpholin- 4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, 2-[(3-aminopyrazolo[l,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[l,5-a]pyridin-4-ol, 3-aminopyrazolo[l,5-a]pyridin-6-ol, 3- aminopyrazolo[l,5-a]pyridin-7-ol, 2-P-hydroxyethoxy-3-aminopyrazolo[l,5-a]pyridine and 2-(4-dimethylpiperazinium-l-yl)-3-aminopyrazolo[l,5-a]pyridi ne, and the corresponding addition salts.

More particularly, the oxidation bases that are useful in the present invention are chosen from 3-aminopyrazolo[l,5-a]pyridines and are preferably substituted on carbon atom 2 with:

a) a (di)(Ci-C ₆ )(alkyl)amino group, said alkyl group possibly being substituted with at least one hydroxy 1, amino or imidazolium group;

b) an optionally cationic 5- to 7-membered heterocycloalkyl group comprising from 1 to 3 heteroatoms, optionally substituted with one or more (Ci-C ₆ )alkyl groups such as a di(Ci-C4)alkylpiperazinium group; or

c) a (Ci-C ₆ )alkoxy group optionally substituted with one or more hydroxyl groups, such as a β-hydroxyalkoxy group, and the corresponding addition salts.

Among the pyrimidine derivatives that may be mentioned are the compounds described, for example, in 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 the addition salts thereof and the tautomeric forms thereof, when a tautomeric equilibrium exists.

Among the pyrazole derivatives that may be mentioned are the compounds described in patents DE 3843892 and DE 4133957 and patent applications WO 94/08969, WO 94/08970, FR-A-2 733 749 and DE 195 43 988, for instance 4,5- diamino- 1 -methylpyrazole, 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-l-phenylpyrazole, 4,5-diamino- l-methyl-3- phenylpyrazole, 4-amino- 1 ,3-dimethyl-5-hydrazinopyrazole, 1 -benzyl-4,5-diamino-3- methylpyrazole, 4,5-diamino-3-tert-butyl- 1 -methylpyrazole, 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, l-methyl-3,4,5-triaminopyrazole, 3,5-diamino-l-methyl-4- methylaminopyrazole and 3,5-diamino-4-( -hydroxyethyl)amino-l-methylpyrazole, and the corresponding addition salts. Use may also be made of 4,5-diamino- 1-(β- methoxyethyl)pyrazole.

A 4,5-diaminopyrazole will preferably be used and even more preferentially 4,5-diamino- l-(P-hydroxyethyl)pyrazole and/or a corresponding salt.

The pyrazole derivatives that may also be mentioned include diamino-N,N- dihydropyrazolopyrazolones and in particular those described in patent application FRA-2 886 136, such as the following compounds and the corresponding addition salts: 2,3-diamino-6,7-dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 2-amino-3-ethylamino- 6,7-dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 2-amino-3-isopropylamino-6,7- dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 2-amino-3-(pyrrolidin- 1 -yl)-6,7- dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 4,5-diamino- 1 ,2-dimethyl- 1 ,2- dihydropyrazol-3-one, 4,5-diamino-l,2-diethyl-l,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- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 2-amino-3-dimethylamino-6,7- dihydro- lH,5H-pyrazolo[ 1 ,2-a]pyrazol- 1 -one, 2,3-diamino-5,6,7,8-tetrahydro- 1H,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 and 2,3-diamino-6-hydroxy-6,7-dihydro-lH,5H-pyrazolo[l,2- a]pyrazol-l-one.

Use will preferably be made of 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2- a]pyrazol-l-one and/or a corresponding salt.

Heterocyclic bases that will preferably be used include 4,5-diamino- 1-(β- hydroxyethyl)pyrazole and/or 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol- 1-one and/or a corresponding salt.

The composition according to the invention may optionally comprise one or more coupling agents advantageously chosen from those conventionally used in the dyeing of keratin fibres .

Among these coupling agents, mention may be made in particular of meta- phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based coupling agents and heterocyclic coupling agents, and also the corresponding addition salts.

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

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

The oxidation base(s) each advantageously represent from 0.001% 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 containing them.

Preferably, the oxidation base(s) are chosen from heterocyclic bases, para- phenylenediamines and para-aminophenols, and also the addition salts thereof and/or the solvates thereof, and mixtures thereof.

More preferentially, the oxidation base(s) are chosen from N,N-bis(2- hydroxyethyl)-para-phenylenediamine, 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2- ajpyrazolone, l-hydroxyethyl-4,5-diaminopyrazole, 2-(2-hydroxyethoxy)-3- aminopyrazolo[ 1 ,5-a]pyridine and 4-(3-aminopyrazolo[ 1 ,5-a]pyridin-2-yl)- 1,1- dimethylpiperazin-l-ium chloride, and also the addition salts thereof, the solvates thereof, and mixtures thereof.

According to one embodiment, the composition according to the invention comprises:

one or more aminobenzene couplers of formula (I) chosen from compounds (1), (2), (3), (4), (5) and (35), and also the addition salts thereof, the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the solvates thereof, and mixtures thereof. In a particularly preferred embodiment, the composition according to the invention comprises:

- one or more aminobenzene couplers of formula (I) chosen from compounds (1), (2), (3), (4) and (5), and also the addition salts thereof, the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the solvates thereof, and mixtures thereof,

- one or more oxidation bases chosen from heterocyclic bases, para- phenylenediamines, and also the addition salts thereof, the solvates thereof, or mixtures thereof, preferably chosen from heterocyclic bases, and also the addition salts thereof, the solvates thereof, or mixtures thereof.

Oxidizing agents

The composition according to the invention may also comprise one or more chemical oxidizing agents.

The term "chemical oxidizing agent" means an oxidizing agent other than atmospheric oxygen.

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

This oxidizing agent advantageously consists of hydrogen peroxide especially as an aqueous solution (aqueous hydrogen peroxide solution), the concentration of which may range more particularly from 0.1% to 50% by weight, even more preferentially from 0.5% to 20% by weight and better still from 1% to 15% by weight relative to the weight of the composition containing it or of the ready- to-use composition.

Preferably, the composition of the invention does not contain any peroxygenated salts.

Fatty substances

According to a particular embodiment of the invention, the composition(s) used in the process for dyeing keratin fibres comprise one or more fatty substances. The term "fatty substance" means an organic compound that is insoluble in water at ordinary temperature (25°C) and at atmospheric pressure (760 mmHg or 1.013 ^χ 10 ⁵ Pa) (solubility of less than 5%, preferably of less than 1% and even more preferentially of less than 0.1%). They bear 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 generally soluble in organic solvents under the same temperature and pressure conditions, for instance chloroform, dichloromethane, carbon tetrachloride, ethanol, benzene, toluene, tetrahydrofuran (THF), liquid petroleum jelly or decamethylcyclopentasiloxane.

The fatty substances of the invention do not contain any salified carboxylic acid groups.

In addition, the fatty substances of the invention are not (poly)oxyalkylenated or (poly)glycerolated ethers.

The term "oil" means a "fatty substance" that is liquid at room temperature (25°C) and at atmospheric pressure (760 mmHg or 1.013 x 10 ⁵ Pa).

The term "non-silicone oil" means an oil not containing any silicon atoms (Si) and the term "silicone oil" means an oil containing at least one silicon atom.

More particularly, the fatty substance(s) are chosen from C ₆ -Ci6 hydrocarbons, hydrocarbons containing more than 16 carbon atoms, non-silicone oils of animal origin, triglycerides of plant or synthetic origin, fluoro oils, fatty alcohols, esters of fatty acids and/or of fatty alcohols other than triglycerides and non-silicone waxes, in particular plant waxes, non-silicone waxes, and silicones, and mixtures thereof.

It is recalled that the fatty alcohols, esters and acids more particularly contain at least one saturated or unsaturated, linear or branched hydrocarbon-based group, comprising 6 to 30 and better still from 8 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 C ₆ -Ci6 hydrocarbons, they are more particularly linear, branched or optionally cyclic, and are preferably alkanes. Examples that may be mentioned include hexane, cyclohexane, undecane, dodecane, tridecane or isoparaffms, such as isohexadecane, isodecane or isododecane, and mixtures thereof. The linear or branched hydrocarbons of mineral or synthetic origin containing more than 16 carbon atoms are preferably chosen from liquid paraffins, petroleum jelly, liquid petroleum jelly, polydecenes and hydrogenated polyisobutene such as Parleam®, and mixtures thereof.

A hydrocarbon-based oil of animal origin that may be mentioned is perhydrosqualene.

The triglycerides of plant or synthetic origin are preferably chosen from liquid fatty acid triglycerides containing from 6 to 30 carbon atoms, for instance heptanoic or octanoic acid triglycerides, or alternatively, more particularly from those present in plant oils, for instance 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, jojoba oil, shea butter oil or synthetic 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, and mixtures thereof.

Fluoro oils that may be mentioned include perfluoromethylcyclopentane and perfluoro-l ,3-dimethylcyclohexane, sold under the names Flutec® PCI and Flutec® PC3 by the company BNFL Fluorochemicals; perfluoro-l ,2-dimethylcyclo butane; perfluoroalkanes such as dodecafluoropentane and tetradecafluorohexane, sold under the names PF 5050® and PF 5060® by the company 3M, or alternatively 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 comprising from 6 to 30 carbon atoms and preferably from 8 to 30 carbon atoms. Examples that may be mentioned include cetyl alcohol, isostearyl alcohol, stearyl alcohol and a mixture thereof (cetylstearyl alcohol), octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol, oleyl alcohol, linolenyl alcohol, ricinoleyl alcohol, undecylenyl alcohol and linoleyl alcohol, and mixtures thereof.

As regards the esters of fatty acids and/or of fatty alcohols advantageously other than the triglycerides mentioned above and non-silicone waxes, mention may be made especially of esters of saturated or unsaturated, linear Ci-C ₂₆ or branched C ₃ -C ₂₆ aliphatic monoacids or polyacids and of saturated or unsaturated, linear Ci- C ₂ 6 or branched C3-C26 aliphatic monoalcohols or polyalcohols, the total carbon number of the esters being greater than or equal to 6 and more advantageously greater than or equal to 10.

Among the monoesters, mention may be made of dihydroabietyl behenate; octyldodecyl behenate; isocetyl behenate; cetyl lactate; C ₁₂ -C ₁₅ 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 and mixtures thereof.

Still within the context of this variant, esters of C4-C22 dicarboxylic or tricarboxylic acids and of C1-C22 alcohols and esters of mono-, di- or tricarboxylic acids and of C1-C26 di-, tri-, tetra- 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, and mixtures thereof.

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, and mixtures thereof. 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 bearing 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 and fatty acid esters may be chosen in particular from the group comprising the esters or mixtures of sugar esters 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 mono-, di-, tri-, tetraesters and polyesters, and mixtures thereof.

These esters may be chosen, for example, from 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 monooleate or dioleate, stearate, behenate, oleopalmitate, linoleate, linolenate or oleostearate.

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 palmitate/stearates 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-polyester;

- the sucrose mono-dipalmito-stearate 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, plant waxes, such as olive tree wax, rice wax, hydrogenated jojoba wax or absolute flower waxes, such as the blackcurrant blossom essential wax sold by Bertin (France), or animal waxes, such as beeswaxes or modified beeswaxes (cerabellina); other waxes or waxy raw materials that may be used according to the invention are in particular marine waxes, such as that sold by Sophim under the reference M82, polyethylene waxes or polyolefm waxes in general.

The silicones that may be used in the dye composition according to the present invention are volatile or non- volatile, cyclic, linear or branched silicones, which are unmodified or modified with organic groups, having a viscosity from 5 l0 ^"6 to 2.5 m ² /s at 25°C, and preferably l lO ^"5 to 1 m ² /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(s) are chosen from polydialkylsiloxanes, especially polydimethylsiloxanes (PDMSs), and organomodified polysiloxanes comprising at least one functional group preferably chosen from 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 with a boiling point of between 60°C and 260°C, and even more particularly from:

(i) cyclic polydialkylsiloxanes comprising 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 dimethylsiloxanes/methylalkylsiloxane type, such as Volatile Silicone® FZ 3109 sold by the company Union Carbide, of formula:

- D"— D' D" - D' -

ChL ChL with D" : ^— Si - O— with 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 tetra(trimethylsilyl)pentaerythritol (50/50) and the mixture of octamethylcyclotetrasiloxane and oxy-l,l '-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 m ² /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 above organoiunctional groups, and mixtures thereof, are preferably used.

These silicones are more particularly chosen from polydialkylsiloxanes, among which mention may be made mainly of polydimethylsiloxanes bearing trimethylsilyl 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 having 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(Ci-C2o)dialkylsiloxanes.

The silicone gums that may 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 may be chosen from volatile silicones, polydimethylsiloxane (PDMS) oils, polyphenylmethylsiloxane (PPMS) oils, isoparaffins, polyisobutylenes, methylene chloride, pentane, dodecane and tridecane, or mixtures thereof.

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

- the 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 of a polydimethylsiloxane gum and of 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 of 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 may be used in accordance with the invention are crosslinked siloxane systems containing the following units:

R ₂ Si0 ₂ /2, R ₃ SiOi/ ₂ , RSi0 _3/2 and Si0 _4/2 , 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 dimethy 1/trimethylsilo xane 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 may be used in accordance with the invention are silicones as defined above and comprising in their structure one or more organofunctional groups as mentioned previously, attached via a hydrocarbon-based group.

Besides the silicones described above, the organomodified silicones may be polydiarylsiloxanes, in particular polydiphenylsiloxanes, and polyalkylarylsiloxanes functionalized by the organofunctional groups mentioned previously.

The polyalkylarylsiloxanes are chosen particularly from linear and/or branched polydimethyl/methylphenylsiloxanes and polydimethyl/diphenylsiloxanes with a viscosity ranging from 1 x 10 ^"5 to 5 x 10 ^"2 m ² /s at 25 ⁰ 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 Rhodorsil ^® 70 633 and 763 series 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 PN 1000 and PHI 000;

. certain oils of the SF series from General Electric, such as SF 1023, SF 1154, SF 1250 and SF 1265.

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

- substituted or unsubstituted amine groups, such as the products sold under the names 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 amino 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 substance(s) are chosen from compounds that are liquid or pasty at room temperature (25°C) and at atmospheric pressure.

Preferably, the fatty substance(s) are chosen from compounds that are liquid at a temperature of 25°C and at atmospheric pressure.

Preferably, the fatty substance(s) are non-silicone.

The fatty substance(s) are advantageously chosen from hydrocarbons containing more than 16 carbon atoms, C ₆ -Ci6 alkanes, triglycerides or oils of plant origin, liquid synthetic triglycerides, fatty alcohols, esters of fatty acids and/or of fatty alcohols other than triglycerides and non-silicone waxes, or mixtures thereof.

More preferentially, the fatty substance(s) are chosen from liquid petroleum jelly and liquid fatty alcohols such as 2-octyldodecanol.

The dye composition according to the invention may comprise at least 10% by weight of fatty substance, more particularly at least 15% by weight, preferably at least 20% by weight and even more particularly at least 25% by weight of fatty substance, relative to the weight of the dye composition or to the weight of the ready- to-use composition.

Preferably, the fatty substance(s) are present in the composition in a content ranging from 10%> to 80%> by weight, advantageously from 15% to 80%> by weight and more preferentially from 20% to 80% by weight relative to the weight of the dye composition or to the weight of the ready-to-use composition.

According to a more particular embodiment, the fatty substance content ranges from 25% to 80% by weight, preferably from 30% to 70%> by weight and even more advantageously from 30% to 60% by weight relative to the weight of the dye composition or to the weight of the ready-to-use composition. Surfactants:

According to a particular embodiment of the invention, the dye composition comprises one or more surfactants.

In particular, the surfactant(s) are chosen from anionic, amphoteric, zwitterionic, cationic and nonionic surfactants, and preferentially nonionic surfactants.

The term "anionic surfactant" means a surfactant comprising, as ionic or ionizable groups, only anionic groups. These anionic groups are preferably chosen from the groups -C(0)OH, -C(0)0 ^~ , -S0 ₃ H, -S(0) ₂ 0, -OS(0) ₂ OH, -OS(0) ₂ 0 ^~ , -P(0)OH ₂ , -P(0) ₂ 0 ^~ ,-P(0)0 ₂ ^~ , -P(OH) ₂ , =P(0)OH, -P(OH)0 ^~ , =P(0)0 ^~ =POH, and =PO ^" , the anionic parts comprising a cationic counterion such as those derived from an alkali metal, an alkaline-earth metal, an amine or an ammonium.

As examples of anionic surfactants that may be used in the composition according to the invention, mention may be made of alkyl sulfates, alkyl ether sulfates, alkylamido ether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, alkylsulfonates, alkylamidesulfonates, alkylarylsulfonates, a-olefm sulfonates, paraffin sulfonates, alkyl sulfo succinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl sulfoacetates, acylsarcosinates, acylglutamates, alkyl sulfo succinamates, acylisethionates and N-acyltaurates, polyglycoside polycarboxylic acid and alkyl monoester salts, acyl lactylates, salts of D-galactoside uronic acids, salts of alkyl ether carboxylic acids, salts of alkylaryl ether carboxylic acids, salts of alkylamido ether carboxylic acids; and the corresponding non-salified forms of all these compounds; the alkyl and acyl groups of all these compounds comprising from 6 to 24 carbon atoms and the aryl group denoting a phenyl group.

These compounds may be oxyethylenated and then preferably comprise from 1 to 50 ethylene oxide units.

The salts of C ₆ -C ₂ 4 alkyl monoesters of polyglycoside-polycarboxylic acids may be chosen from C ₆ -C ₂ 4 alkyl polyglycoside-citrates, C ₆ -C ₂ 4 alkyl polyglycoside- tartrates and C ₆ -C ₂ 4 alkyl polyglycoside-sulfosuccinates.

When the anionic surfactant(s) are in salt form, they may be chosen from alkali metal salts such as the sodium or potassium salt and preferably the sodium salt, ammonium salts, amine salts and in particular amino alcohol salts or alkaline-earth metal salts such as the magnesium salts. Mention may in particular be made, as examples of amino alcohol salts, of mono-, di- and triethanolamine salts, mono-, di- or triisopropanolamine salts, 2- amino-2-methyl-l-propanol salts, 2-amino-2-methyl-l,3-propanediol salts and tris(hydroxymethyl)aminomethane salts.

Use is preferably made of alkali metal or alkaline-earth metal salts, and in particular sodium or magnesium salts.

Among the anionic surfactants mentioned, use is preferably made of (C ₆ - C ₂₄ )alkyl sulfates, (C ₆ -C ₂₄ )alkyl ether sulfates comprising from 2 to 50 ethylene oxide units, especially in the form of alkali metal, ammonium, amino alcohol and alkaline-earth metal salts, or a mixture of these compounds.

In particular, it is preferred to use (Ci ₂ -C ₂ o)alkyl sulfates, (Ci ₂ -C ₂ o)alkyl ether sulfates comprising from 2 to 20 ethylene oxide units, especially in the form of alkali metal, ammonium, amino alcohol and alkaline-earth metal salts, or a mixture of these compounds. Better still, it is preferred to use sodium lauryl ether sulfate containing 2.2 mol of ethylene oxide.

The amphoteric or zwitterionic surfactant(s), which are preferably non- silicone, which may be used in the present invention may especially be derivatives of optionally quatemized aliphatic secondary or tertiary amines, in which derivatives the aliphatic group is a linear or branched chain comprising from 8 to 22 carbon atoms, said amine derivatives containing at least one anionic group, for instance a carboxylate, sulfonate, sulfate, phosphate or phosphonate group. Mention may be made in particular of (Cs-C ₂ o)alkyl betaines, sulfobetaines, (C ₈ -C ₂ o)alkylamido(C ₃ - Cs)alkyl betaines and (C ₈ -C ₂ o)alkylamido(C ₆ -C ₈ )alkyl sulfobetaines.

Among the optionally quatemized secondary or tertiary aliphatic amine derivatives that may be used, as defined above, mention may also be made of the compounds of respective structures (Al) and (A2) below:

R _a -C(0)-NH-CH ₂ -CH ₂ -N ⁺ (R _b )(R _c )-CH ₂ C(0)0-, M ⁺ , X ^" (Al) in which formula (Al):

^■ R _a represents a C ₁₀ -C ₃₀ alkyl or alkenyl group derived from an acid R _a - COOH preferably present in hydrolyzed copra oil, or a heptyl, nonyl or undecyl group;

^■ R _b represents a β-hydroxyethyl group; and

^■ R _c represents a carboxymethyl group; ^■ M represents a cationic counterion derived from an alkali metal or alkaline-earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine, and

^■ X ^" represents an organic or mineral anionic counterion, such as that chosen from halides, acetates, phosphates, nitrates, (Ci-C4)alkyl sulfates, (Ci-

C4)alkyl- or (Ci-C4)alkylaryl sulfonates, in particular methyl sulfate and ethyl sulfate; or alternatively M ⁺ and X ^" are absent;

Ra'-C(0)-NH-CH2-CH2-N(B)(B') (A2)

in which formula (A2):

■ B represents the group -CH2-CH2-O-X;

^■ B' represents the group -(CH ₂ ) _Z Y', with z = 1 or 2;

^■ X represents the group -CH ₂ -C(0)OH, -CH ₂ -C(0)OZ', -CH ₂ -CH ₂ - C(0)OH or

-CH ₂ -CH ₂ -C(0)OZ', or a hydrogen atom;

■ Y ^* represents the group -C(0)OH, -C(0)OZ', -CH ₂ -CH(OH)-S0 ₃ H or the group -CH ₂ -CH(OH)-S0 ₃ -Z';

^■ Z' represents a cationic counterion derived from an alkali metal or alkaline-earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine;

■ Ra' represents a Cio-C ₃ o alkyl or alkenyl group derived from an acid

Ra'-C(0)OH, which is preferably present in coconut oil or in hydrolyzed linseed oil, an alkyl group, especially a C ₁₇ group and its iso form, or an unsaturated Civ group.

These compounds are classified in the CTFA dictionary, 5th edition, 1993, under the names disodium cocoamphodiacetate, disodium lauroamphodiacetate, disodium caprylamphodiacetate, disodium capryloamphodiacetate, disodium cocoamphodipropionate, disodium lauroamphodipropionate, disodium caprylamphodipropionate, disodium capryloamphodipropionate, lauroamphodipropionic acid and cocoamphodipropionic acid.

By way of example, mention may be made of the cocoamphodiacetate sold by the company Rhodia under the trade name Miranol ^® C2M Concentrate.

Use may also be made of the compounds of formula (A3):

R _a "-N(H)-CH(Y")-(CH ₂ ) _n -C(0)-N(H)-(CH ₂ ) _n .-N(R _d )(R _e ) (A3) in which formula (A3): ^■ Y* represents the group -C(0)OH, -C(0)OZ", -CH ₂ -CH(OH)-S0 ₃ H or the group -CH ₂ -CH(OH)-S0 ₃ -Z";

^■ Rd and Re represent, independently of each other, a C1 -C4 alkyl or hydroxyalkyl radical;

■ Z" represents a cationic counterion derived from an alkali metal or alkaline- earth metal, such as sodium, an ammonium ion or an ion derived from an organic amine;

^■ Ra" represents a Cio-C ₃ o alkyl or alkenyl group derived from an acid

Ra"-C(0)OH, which is preferably present in coconut oil or in hydro lyzed linseed oil;

^■ n and n' denote, independently of one another, an integer ranging from 1 to 3.

Among the compounds of formula (A3), mention may be made of the compound classified in the CTFA dictionary under the name sodium diethylaminopropyl cocoaspartamide and sold by the company Chimex under the name Chimexane HB.

Among the amphoteric or zwitterionic surfactants mentioned above, use is preferably made of (C ₈ -C ₂ o)alkylbetaines such as cocoylbetaine, and (C ₈ - C ₂ o)alkylamido(C ₃ -C ₈ )alkylbetaines such as cocamidopropylbetame, and mixtures thereof. More preferentially, the amphoteric or zwitterionic surfactant(s) are chosen from cocamidopropylbetame and cocoylbetaine.

The cationic surfactant(s) that may be used in the composition according to the invention comprise, for example, optionally polyoxyalkylenated primary, secondary or tertiary fatty amine salts, quaternary ammonium salts, and mixtures thereof.

Examples of quaternary ammonium salts that may especially be mentioned include:

those corresponding to the general formula (A4) below:

(A4)

in which formula (A4):

■ R¾ to R11, which may be identical or different, represent a linear or branched aliphatic group comprising from 1 to 30 carbon atoms, or an aromatic group such as aryl or alkylaryl, it being understood that at least one of the groups Rs to Ri i comprises from 8 to 30 carbon atoms and preferably from 12 to 24 carbon atoms; and

^■ X ^" represents an organic or mineral anionic counterion, such as that chosen from halides, acetates, phosphates, nitrates, (Ci-C4)alkyl sulfates, (Ci- C4)alkyl- or (Ci-C4)alkylaryl sulfonates, in particular methyl sulfate and ethyl sulfate.

The aliphatic groups of Rs to Rn may also comprise heteroatoms especially such as oxygen, nitrogen, sulfur and halogens.

The aliphatic groups of Rs to Rn are chosen, for example, from C1-C30 alkyl, C1-C30 alkoxy, polyoxy(C2-Ce)alkylene, C1-C30 alkylamide, (C ₁₂ - C22)alkylamido(C2-C6)alkyl, (Ci2-C22)alkyl acetate, and C1-C30 hydroxyalkyl groups; X ^" is an anionic counterion chosen from halides, phosphates, acetates, lactates, (Ci- C4)alkyl sulfates, and (Ci-C4)alkylsulfo nates or (Ci-C4)alkylarylsulfonates.

Among the quaternary ammonium salts of formula (A4), preference is given firstly to tetraalkylammonium chlorides, for instance dialkyldimethylammonium or alkyltrimethylammonium chlorides in which the alkyl group contains approximately from 12 to 22 carbon atoms, in particular behenyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium chloride, benzyldimethylstearylammonium chloride, or else, secondly, distearoylethylhydroxyethylmethylammonium methosulfate, dipalmitoylethylhydroxyethylammonium methosulfate or distearoylethylhydroxyethylammonium methosulfate, or else, lastly, palmitylamidopropyltrimethylammonium chloride or stearamidopropyldimethyl(myristyl acetate)ammonium chloride, sold under the name Ceraphyl® 70 by the company Van Dyk;

- quaternary ammonium salts of imidazoline, for instance those of formula (A5) below:

(A5) in which formula (A5): ^■ Ri2 represents an alkenyl or alkyl group comprising from 8 to 30 carbon atoms, for example fatty acid derivatives of tallow;

^■ Ri3 represents a hydrogen atom, a C1-C4 alkyl group or an alkenyl or alkyl group comprising from 8 to 30 carbon atoms;

■ Ri4 represents a C1-C4 alkyl group;

^■ Ri5 represents a hydrogen atom or a C1-C4 alkyl group;

^■ X ^" represents an organic or mineral anionic counterion, such as that chosen from halides, phosphates, acetates, lactates, (Ci-C4)alkyl sulfates, (Ci- C4)alkylsulfonates or (Ci-C4)alkylarylsulfonates.

Preferably, R12 and R13 denote a mixture of alkenyl or alkyl groups comprising from 12 to 21 carbon atoms, for example derived from tallow fatty acids, Ri4 denotes a methyl group and R15 denotes a hydrogen atom. Such a product is sold, for example, under the name Rewoquat® W 75 by the company Rewo;

- quaternary diammonium or triammonium salts, particularly of formula (A6) below:

2+

R 17

-N— (CH ₂ ) ₃ — N— R 2X ~

R,

(A6)

in which formula (III):

^■ Ri6 denotes an alkyl group comprising approximately from 16 to 30 carbon atoms, which is optionally hydroxylated and/or interrupted with one or more oxygen atoms;

^■ Ri7 is chosen from hydrogen, an alkyl group comprising from 1 to 4 carbon atoms or a group -(CH ₂ )3-N ⁺ (Ri ₆ a)(Ri7a)(Ri8a), X ^" ;

^■ Ri6a, Ri7a, Ri8a, Ri8, Ri9, R ₂ o and R ₂₁ , which may be identical or different, are chosen from hydrogen and an alkyl group comprising from 1 to 4 carbon atoms; and

^■ X ^" , which may be identical or different, represents an organic or mineral anionic counterion, such as that chosen from halides, acetates, phosphates, nitrates, alkyl(Ci-C4) sulfates, alkyl(Ci-C4)- or alkyl(Ci-C4)aryl-sulfonates, more particularly methyl sulfate and ethyl sulfate. Such compounds are, for example, Finquat CT-P, sold by the company Finetex (Quatemium 89), and Finquat CT, sold by the company Finetex (Quatemium 75);

- quaternary ammonium salts containing one or more ester functions, such as those of formula (A7) below:

in which formula (A7):

^■ P 22 is chosen from Ci-C ₆ alkyl groups and Ci-C ₆ hydroxyalkyl or Ci-C ₆ dihydroxyalkyl groups;

■ P 23 is chosen from:

O

^

- the group ²⁶ ,

- saturated or unsaturated, linear or branched C1-C22 hydrocarbon-based groups R27,

- a hydrogen atom,

■ R25 is chosen from:

O

p Q

- the group ²⁸ ,

- saturated or unsaturated, linear or branched Ci -C ₆ hydrocarbon-based groups R ₂₉ ,

- a hydrogen atom,

■ R24, R26 and R28, which may be identical or different, are chosen from linear or branched, saturated or unsaturated C7-C21 hydrocarbon-based groups;

^■ r, s and t, which may be identical or different, are integers ranging from 2 to 6,

^■ rl and tl , which may be identical or different, are equal to 0 or 1, with r2+r 1 =2r and 11 +t2=2t,

^■ y is an integer ranging from 1 to 10,

^■ x and z, which may be identical or different, are integers ranging from 0 to 10; ^■ X ^" represents an organic or mineral anionic counterion,

with the proviso that the sum x + y + z is from 1 to 15, that when x is 0 then R23 denotes R27, and that when z is 0 then R ₂₅ denotes a linear or branched, saturated or unsaturated Ci-C ₆ hydrocarbon-based radical R29.

The alkyl groups R ₂₂ may be linear or branched, and more particularly linear.

Preferably, R ₂₂ denotes a methyl, ethyl, hydroxyethyl or dihydroxypropyl group, and more particularly a methyl or ethyl group.

Advantageously, the sum x + y + z is from 1 to 10.

When R ₂₃ is a hydrocarbon-based group R ₂₇ , it may be long and contain from 12 to 22 carbon atoms, or may be short and contain from 1 to 3 carbon atoms.

When R25 is a hydrocarbon-based group R29, it preferably contains 1 to 3 carbon atoms.

Advantageously, R ₂₄ , R ₂ 6 and R ₂ 8, which may be identical or different, are chosen from linear or branched, saturated or unsaturated Cn-C ₂₁ hydrocarbon-based groups, and more particularly from linear or branched, saturated or unsaturated Cn- C ₂ i alkyl and alkenyl groups.

x and z, which may be identical or different, are preferably 0 or 1.

Advantageously, y is equal to 1.

Preferably, r, s and t, which may be identical or different, have the value 2 or 3 and more particularly still are equal to 2.

The anionic counterion X ^" is preferably a halide, such as chloride, bromide or iodide; a (Ci-C ₄ )alkyl sulfate or a (Ci-C ₄ )alkyl- or (Ci-C ₄ )alkylarylsulfonate. However, use may be made of methanesulfonate, phosphate, nitrate, tosylate, an anion derived from an organic acid, such as acetate or lactate, or any other anion which is compatible with the ammonium having an ester function.

The anionic counterion X ^" is even more particularly chloride, methyl sulfate or ethyl sulfate.

Use is made more particularly, in the composition according to the invention, of the ammonium salts of formula (A7) in which:

- R ₂₂ denotes a methyl or ethyl group,

- x and y are equal to 1 ,

- z is equal to 0 or 1 ,

- r, s and t are equal to 2, - R23 is chosen from:

O

^

• the group ²⁶

• methyl, ethyl or C14-C22 hydrocarbon-based groups,

• a hydrogen atom,

- R25 is chosen from:

O

p Q

• the group ²⁸

• a hydrogen atom,

- R24, R26 and R28, which may be identical or different, are chosen from linear or branched, saturated or unsaturated C ₁₃ -C ₁₇ hydrocarbon-based groups, and preferably from linear or branched, saturated or unsaturated C ₁₃ -C ₁₇ alkyl and alkenyl groups.

Advantageously, the hydrocarbon-based radicals are linear.

Among the compounds of formula (A7), examples that may be mentioned include salts, especially the chloride or methyl sulfate, of diacyloxyethyldimethylammonium, diacyloxyethylhydroxyethylmethylammonium, monoacyloxyethyldihydroxyethylmethylammonium,

triacyloxyethylmethylammonium or monoacyloxyethylhydroxyethyldimethylammonium, and mixtures thereof. The acyl groups preferably contain 14 to 18 carbon atoms and are obtained more particularly from a plant oil such as palm oil or sunflower oil. When the compound contains several acyl groups, these groups may be identical or different.

These products are obtained, for example, by direct esterification of triethanolamine, triisopropanolamine, an alkyldiethanolamine or an alkyldiisopropanolamine, which are optionally oxyalkylenated, with fatty acids or with fatty acid mixtures of plant or animal origin, or by transesterification of the methyl esters thereof. This esterification is followed by a quaternization by means of an alkylating agent such as an alkyl halide, preferably methyl or ethyl halide, a dialkyl sulfate, preferably dimethyl or diethyl sulfate, methyl methanesulfonate, methyl para-toluenesulfonate, glycol chlorohydrin or glycerol chlorohydrin. Such compounds are sold, for example, under the names Dehyquart by the company Henkel, Stepanquat ^® by the company Stepan, Noxamium ^® by the company CECA or Rewoquat ^® WE 18 by the company Rewo-Witco.

The composition according to the invention may contain, for example, a mixture of quaternary ammonium monoester, diester and triester salts with a weight majority of diester salts.

It is also possible to use the ammonium salts containing at least one ester function that are described in patents US-A-4 874 554 and US-A-4 137 180.

Use may be made of behenoylhydroxypropyltrimethylammonium chloride sold by KAO under the name Quatarmin BTC 131.

Preferably, the ammonium salts comprising at least one ester functional group comprise two ester functional groups.

Among the cationic surfactants that may be present in the composition according to the invention, it is more particularly preferred to choose cetyltrimethylammonium, behenyltrimethylammonium and dipalmitoylethylhydroxyethylmethylammonium salts, and mixtures thereof, and more particularly behenyltrimethylammonium chloride, cetyltrimethylammonium chloride, and dipalmitoylethylhydroxyethylammonium methosulfate, and mixtures thereof.

Examples of nonionic surfactants that may be used in the composition used according to the invention are described, for example, in the "Handbook of Surfactants" by M.R. Porter, published by Blackie & Son (Glasgow and London), 1991, pp. 116-178.

Mention may be made, as examples of oxyalkylenated nonionic surfactants, of:

• oxyalkylenated (Cs-C24)alkylphenols;

• saturated or unsaturated, linear or branched, oxyalkylenated C8-C30 alcohols;

• saturated or unsaturated, linear or branched, oxyalkylenated C8-C30 amides;

• esters of saturated or unsaturated, linear or branched, C8-C30 acids and of polyethylene glycols;

• polyoxyethylenated esters of saturated or unsaturated, linear or branched, C8-C30 acids and of sorbitol; • esters of fatty acids and of sucrose;

^• (C ₈ -C3o)alkylpolyglycosides, (C ₈ -C3o)alkenylpolyglycosides, which are optionally oxyalkylenated (0 to 10 oxyalkylene units) and which comprise 1 to 15 glucose units, (C ₈ -C3o)alkylglucoside esters;

• saturated or unsaturated, oxyethylenated plant oils;

• condensates of ethylene oxide and/or of propylene oxide, inter alia, alone or as mixtures;

• N-(C ₈ -C3o)alkylglucamine derivatives and N-(C ₈ -C3o)acyl-methylglucamine derivatives;

• aldobionamides;

• amine oxides;

• oxyethylenated and/or oxypropylenated silicones;

the surfactants containing a number of moles of ethylene oxide and/or of propylene oxide ranging advantageously from 1 to 100, more particularly from 2 to 100, preferably from 2 to 50 and more advantageously from 2 to 30. Advantageously, the nonionic surfactants do not comprise any oxypropylene units.

In accordance with a preferred embodiment of the invention, the oxyalkylenated nonionic surfactants are chosen from oxyethylenated C ₈ -C30 alcohols comprising from 1 to 100 mol and more particularly from 2 to 100 mol of ethylene oxide; polyoxyethylenated esters of saturated or unsaturated, linear or branched C ₈ - C30 acids and of sorbitan comprising from 1 to 100 mol and better still from 2 to 100 mol of ethylene oxide.

As examples of monoglycerolated or polyglycerolated nonionic surfactants, monoglycerolated or polyglycerolated C ₈ -C40 alcohols are preferably used.

In particular, the monoglycerolated or polyglycerolated C ₈ -C40 alcohols correspond to formula (A8) below:

R ₂₉ 0-[CH ₂ -CH(CH ₂ OH)-0] _m -H (A8)

in which formula (A8):

^■ R ₂ 9 represents a linear or branched C8-C40 and preferably C8-C30 alkyl or alkenyl radical; and

^■ m represents a number ranging from 1 to 30 and preferably from 1 to 10. As examples of compounds of formula (A8) that are suitable for use in the context of the invention, mention may be made of lauryl alcohol containing 4 mol of glycerol (INCI name: Polyglyceryl-4 Lauryl Ether), lauryl alcohol containing 1.5 mol of glycerol, oleyl alcohol containing 4 mol of glycerol (INCI name: Polyglyceryl-4 Oleyl Ether), oleyl alcohol containing 2 mol of glycerol (INCI name: Polyglyceryl-2 Oleyl Ether), cetearyl alcohol comprising 2 mol of glycerol, cetearyl alcohol comprising 6 mol of glycerol, oleocetyl alcohol comprising 6 mol of glycerol and octadecanol comprising 6 mol of glycerol.

The alcohol of formula (A8) may represent a mixture of alcohols in the same way that the value of m represents a statistical value, which means that, in a commercial product, several species of polyglycerolated fatty alcohols may coexist in the form of a mixture.

Among the monoglycerolated or polyglycerolated alcohols, it is more particularly preferred to use the Cs/Cio alcohol containing 1 mol of glycerol, the C ₁₀ C ₁₂ alcohol containing 1 mol of glycerol and the C ₁₂ alcohol containing 1.5 mol of glycerol.

Preferably, the surfactant(s) are chosen from nonionic surfactants or from anionic surfactants. More particularly, the surfactant(s) present in the composition are chosen from nonionic surfactants.

Preferentially, the nonionic surfactant used in the process of the invention in the composition is a monooxyalkylenated or polyoxyalkylenated, particularly monooxyethylenated or polyoxyethylenated, or monooxypropylenated or polyoxypropylenated, nonionic surfactant, or a combination thereof, more particularly monooxyethylenated or polyoxyethylenated, monoglycerolated or polyglycerolated surfactants and alkylpolyglucosides.

More preferably still, the nonionic surfactants are chosen from polyoxyethylenated sorbitol esters, polyoxyethylenated fatty alcohols and alkylpolyglucosides, and mixtures thereof.

The surfactant(s) may be present in the composition according to the invention in a content ranging from 0.1% to 50% by weight and better still from 0.5% to 20% by weight relative to the total weight of the dye composition or to the weight of the ready-to-use composition.

Basifying agent

According to a particular embodiment of the invention, the dye composition comprises one or more basifying agents. The basifying agent(s) may be mineral or organic or hybrid.

The mineral basifying agent(s) are preferably chosen from aqueous ammonia, alkali metal carbonates or bicarbonates such as sodium or potassium carbonates and sodium or potassium bicarbonates, sodium hydroxide or potassium hydroxide, or mixtures thereof.

The organic basifying agent(s) are preferably chosen from organic amines with a pKt at 25°C of less than 12, preferably less than 10 and even more advantageously less than 6. It should be noted that it concerns the p¾ corresponding to the functional group having the highest basicity. In addition, the organic amines do not comprise any alkyl or alkenyl fatty chain comprising more than ten carbon atoms.

The organic basifying agent(s) are chosen, for example, from alkanolamines, oxyethylenated and/or oxypropylenated ethylenediamines, amino acids and the compounds of formula (II) below:

N - W - N

/ \

^R y ^R t _(n)

in which formula (II) W is a divalent Ci-C ₆ alkylene radical optionally substituted with one or more hydroxyl groups or a Ci-C ₆ alkyl radical, and/or optionally interrupted with one or more heteroatoms such as O, or NR _U ; R _x , R _y , R _z , Rt and R _u , which may be identical or different, represent a hydrogen atom or a Ci-C ₆ alkyl, Ci-C ₆ hydroxyalkyl or Ci-C ₆ aminoalkyl radical.

Examples of amines of formula (II) that may be mentioned include 1,3- diaminopropane, l,3-diamino-2-propanol, spermine and spermidine.

The term "alkanolamine" means an organic amine comprising a primary, secondary or tertiary amine function, and one or more linear or branched Ci-Cs alkyl groups bearing one or more hydroxyl radicals.

Organic amines chosen from alkanolamines such as monoalkanolamines, dialkanolamines or trialkanolamines comprising one to three identical or different Ci- C ₄ hydroxyalkyl radicals are in particular suitable for performing the invention.

Among the compounds of this type, mention may be made of monoethanolamine (MEA), diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, N-dimethylaminoethanolamine, 2- amino-2-methyl- 1 -propanol, triisopropanolamine, 2-amino-2-methyl- 1,3- propanediol, 3-amino-l,2-propanediol, 3-dimethylamino-l,2-propanediol and tris(hydroxymethylamino)methane.

More particularly, the amino acids that may be used are of natural or synthetic origin, in their L, D or racemic form, and comprise at least one acid function chosen more particularly from carboxylic acid, sulfonic acid, phosphonic acid and phosphoric acid functions. The amino acids may be in neutral or ionic form.

As amino acids that may be used in the present invention, mention may be made in particular of aspartic acid, glutamic acid, alanine, arginine, ornithine, citrulline, asparagine, carnitine, cysteine, glutamine, glycine, histidine, lysine, isoleucine, leucine, methionine, N-phenylalanine, proline, serine, taurine, threonine, tryptophan, tyrosine and valine.

Advantageously, the amino acids are basic amino acids comprising an additional amine function optionally included in a ring or in a ureido function.

Such basic amino acids are preferably chosen from those corresponding to formula (III) below, and also salts thereof:

in which formula (III), R represents a group chosen from: -(CH ₂ ) ₃ NH ₂ ;

-(CH ₂ ) ₂ NH ₂ ; -(CH ₂ ) ₂ NHCONH ₂ ; and

-(CH ₂ ) ₂ NH C— NH ₂

NH

The compounds corresponding to formula (III) are histidine, lysine, arginine, ornithine and citrulline.

The organic amine may also be chosen from organic amines of heterocyclic type. Besides histidine that has already been mentioned in the amino acids, mention may in particular be made of pyridine, piperidine, imidazole, triazole, tetrazole and benzimidazole.

The organic amine may also be chosen from amino acid dipeptides. As amino acid dipeptides that may be used in the present invention, mention may be made especially of carnosine, anserine and balenine. The organic amine may also be chosen from compounds comprising a guanidine function. As amines of this type that may be used in the present invention, besides arginine, which has already been mentioned as an amino acid, mention may be made especially of creatine, creatinine, 1,1-dimethylguanidine, 1,1- diethylguanidine, glycocyamine, metformin, agmatine, N-amidinoalanine, 3- guanidinopropionic acid, 4-guanidinobutyric acid and 2- ([amino(imino)methyl]amino)ethane- 1 -sulfonic acid.

Hybrid compounds that may be mentioned include the salts of the amines mentioned previously with acids such as carbonic acid or hydrochloric acid.

Guanidine carbonate or monoethanolamine hydrochloride may be used in particular.

Preferably, the basifying agent(s) present in the composition of the invention are chosen from alkanolamines, amino acids in neutral or ionic form, in particular basic amino acids, and preferably corresponding to those of formula (III). Even more preferentially, the basifying agent(s) are chosen from monoethanolamine (MEA) and basic amino acids in neutral or ionic form.

Advantageously, the composition according to the invention may have 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 or to the weight of the ready-to-use composition.

According to a first particular embodiment, the composition according to the invention or the process according to the invention does not use aqueous ammonia, or a salt thereof, as basifying agent.

According to a second embodiment, if the dye composition or if the process according to the invention were to use aqueous ammonia, or a salt thereof, as basifying agent, its content should advantageously not exceed 0.03%> by weight (expressed as NH ₃ ), preferably should not exceed 0.01% by weight, relative to the weight of the composition of the invention or to the weight of the ready-to-use composition.

Preferably, if the composition comprises aqueous ammonia, or a salt thereof, then the weight amount of basifying agent(s) other than aqueous ammonia is greater than that of the aqueous ammonia (expressed as NH ₃ ). Additional couplers

The dye composition according to the present invention may also contain one or more additional couplers, different from the aminobenzene couplers of formula (I) as described previously.

Among these additional couplers, mention may be made especially of meta- phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, and also the addition salts and/or solvates 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 -(β- hydroxyethyloxy)benzene, 2-amino-4-(P-hydroxyethylamino)- 1 -methoxybenzene, 1,3-diaminobenzene, l,3-bis(2,4-diaminophenoxy)propane, 3-ureidoaniline, 3- ureido- 1 -dimethylaminobenzene, sesamol, 1 -P-hydroxyethylamino-3 ,4- methylenedioxybenzene, a-naphthol, 2-methyl-l-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(P- hydroxyethylamino)toluene, 6-hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1- H-3-methylpyrazole-5-one, l-phenyl-3-methylpyrazole-5-one, 2,6- dimethylpyrazolo[l,5-b]-l,2,4-triazole, 2,6-dimethyl[3,2-c]-l,2,4-triazole and 6- methylpyrazolo[ 1 ,5-a]benzimidazole, 2-methyl-5-aminophenol, 5-N-(B- hydroxyethyl)amino-2-methylphenol, 3-aminophenol and 3-amino-2-chloro-6- methylphenol, the corresponding addition salts with an acid and the corresponding mixtures.

The addition salts of the additional couplers that may be used in the context of the invention are chosen in particular from the addition salts with an acid such as the hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.

When they are present, the additional coupler(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 of the invention or of the ready-to-use composition. Additional dyes

According to a particular embodiment of the invention, the dye composition comprises one or more synthetic or natural direct dyes, chosen from ionic and nonionic species, preferably cationic or nonionic species, in addition to the oxidation dye(s).

Examples of suitable direct dyes that may be mentioned include azo direct dyes; (poly)methine dyes such as cyanins, hemicyanins and styryls; carbonyl dyes; azine dyes; nitro(hetero)aryl dyes; tri(hetero)arylmethane dyes; porphyrine dyes; phthalocyanin dyes and natural direct dyes, alone or in the form of mixtures.

The direct dyes are preferably cationic direct dyes. Mention may be made of the hydrazono cationic dyes of formulae (Ilia) and (IH'a), the azo cationic dyes (IV a) and (IV'a) and the diazo cationic dyes (Va) below:

which formulae (Ilia), (Ill'a), (IVa), (IV'a) and (Va):

^• Het ⁺ represents a cationic heteroaryl radical, preferably bearing an endocyclic cationic charge, such as imidazolium, indolium or pyridinium, optionally substituted preferably with one or more (Ci-Cs)alkyl groups such as methyl;

• Ar ⁺ represents an aryl radical, such as phenyl or naphthyl, bearing an exocyclic cationic charge, preferably ammonium, particularly tri(Ci-C8)alkyl ammonium such as trimethylammonium;

• Ar represents an aryl group, especially phenyl, which is optionally substituted, preferably with one or more electron-donating groups such as i) optionally substituted (Ci-Cs)alkyl, ii) optionally substituted (Ci-Cs)alkoxy, iii) (di)(Ci- C8)(alkyl)amino optionally substituted on the alkyl group(s) with a hydroxyl group, iv) aryl(Ci-C8)alkylamino, v) optionally substituted N-(C ₁ -C ₈ )alkyl-N- aryl(Ci-C8)alkylamino or, as a variant, Ar represents a julolidine group;

^• Ar' represents an optionally substituted divalent (hetero)arylene group such as phenylene, particularly para-phenylene, or naphthalene, which are optionally substituted, preferably with one or more groups (Ci-Cs)alkyl, hydroxyl or (Ci- Cs)alkoxy;

• Ar" represents an optionally substituted (hetero)aryl group such as phenyl or pyrazolyl, which are optionally substituted, preferably with one or more (Ci- Cs)alkyl, hydroxyl, (di)(Ci-C ₈ )(alkyl)amino, (Ci-Cs)alkoxy or phenyl groups;

• R ^a and R ^b , which may be identical or different, represent a hydrogen atom or a (Ci-Cs)alkyl group, which is optionally substituted, preferably with a hydroxyl group;

or, as a variant, the substituent R ^a with a substituent of Het ⁺ and/or R ^b with a substituent of Ar and/or R ^a with R ^b form, together with the atoms that bear them, a

(hetero)cycloalkyl;

particularly, R ^a and R ^b represent a hydrogen atom or a (Ci-C ₄ )alkyl group, which is optionally substituted with a hydroxyl group;

^• An ^" represents an anionic counterion, such as mesylate or halide.

Mention may be made in particular of azo and hydrazono cationic dyes bearing an endocyclic cationic charge of formulae (Ilia), (Ill'a) and (IVa) as defined previously. More particularly those of formulae (Ilia), (Ill'a) and (IVa) derived from the dyes described in patent applications WO 95/15144, WO 95/01772 and EP-714954.

in which formulae (III-l) and (IV- 1):

- R ¹ represents a (Ci-C ₄ )alkyl group such as methyl;

- R ² and R ³ , which may be identical or different, represent a hydrogen atom or a (Ci-C ₄ )alkyl group, such as methyl; and

- R ⁴ represent a hydrogen atom or an electron-donating group such as an optionally substituted (Ci-Cs)alkyl group, an optionally substituted (Ci-Cs)alkoxy group, or a (di)(Ci-C ₈ )(alkyl)amino group optionally substituted on the alkyl group(s) with a hydroxyl group; in particular, R ⁴ represents a hydrogen atom,

- Z represents a CH group or a nitrogen atom, preferably CH,

- An ^" represents an anionic counterion, such as mesylate or halide.

In particular, the dye of formulae (IIIa-1) and (IVa-1) is chosen from Basic Red 51 , Basic Yellow 87 and Basic Orange 31 or corresponding derivatives:

Among the natural dyes that may be used according to the invention, mention may be made of hennotannic acid, juglone, alizarin, purpurin, carminic acid, kermesic acid, purpurogallin, protocatechaldehyde, indigo, isatin, curcumin, spinulosin, apigenidin and orcein. 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 relative to the total weight of the composition or of the ready-to-use composition.

Other additives:

The composition according to the invention may also contain various adjuvants conventionally used in hair dye compositions, such as anionic, cationic, nonionic, amphoteric or zwitterionic polymers or mixtures thereof; mineral thickeners, and in particular fillers such as clays or talc; organic thickeners with, in particular, anionic, cationic, nonionic and amphoteric polymeric associative thickeners; antioxidants; penetrants; sequestrants; fragrances; dispersants; film- forming agents; ceramides; preserving agents; 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 or to the weight of the ready-to-use composition. The composition may especially comprise one or more mineral thickeners chosen from organophilic clays and fumed silicas, or mixtures thereof.

The organophilic clay may be chosen from montmorillonite, bentonite, hectorite, attapulgite and sepiolite, and mixtures thereof. The clay is preferably a bentonite or a hectorite.

These clays may be modified with a chemical compound chosen from quaternary amines, tertiary amines, amine acetates, imidazolines, amine soaps, fatty sulfates, alkylaryl sulfonates and amine oxides, and mixtures thereof.

Mention may be made, as organophilic clays, of quaternium-18 bentonites, such as those sold under the names Bentone 3, Bentone 38 and Bentone 38V by Rheox, Tixogel VP by United Catalyst and Claytone 34, Claytone 40 and Claytone XL by Southern Clay; stearalkonium bentonites, such as those sold under the names Bentone 27 by Rheox, Tixogel LG by United Catalyst and Claytone AF and Claytone APA by Southern Clay; and quaternium-18/benzalkonium bentonites, such as those sold under the names Claytone HT and Claytone PS by Southern Clay.

The fumed silicas may be obtained by high-temperature hydrolysis of a volatile silicon compound in an oxyhydrogen flame, producing a finely divided silica. This process makes it possible in particular to obtain hydrophilic silicas bearing a large number of silanol groups at their surface. Such hydrophilic silicas are sold, for example, under the names Aerosil 130®, Aerosil 200®, Aerosil 255®, Aerosil 300® and Aerosil 380® by Degussa and Cab-O-Sil HS-5®, Cab-O-Sil EH- 5®, Cab-O-Sil LM-130®, Cab-O-Sil MS-55® and Cab-O-Sil M-5® by Cabot.

It is possible to chemically modify the surface of the silica via chemical reaction in order to reduce the number of silanol groups. It is especially possible to substitute silanol groups with hydrophobic groups: a hydrophobic silica is then obtained.

The hydrophobic groups may be:

- trimethylsiloxyl groups, which are obtained in particular by treating fumed silica in the presence of hexamethyldisilazane. Silicas thus treated are known as Silica silylate according to the CTFA (6th Edition, 1995). They are sold, for example, under the references Aerosil R812® by Degussa and Cab-O-Sil TS-530® by Cabot.

- dimethylsilyloxyl or polydimethylsiloxane groups, which are obtained in particular by treating fumed silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. Silicas thus treated are known as "silica dimethyl silylate" according to the CTFA (6th Edition, 1995). They are sold, for example, under the references Aerosil R972® and Aerosil R974® by the company Degussa and Cab-O- Sil TS-610® and Cab-O-Sil TS-720® by the company Cabot.

The fumed silica preferably has a particle size that may be nanometric to micrometric, for example ranging from about 5 to 200 nm.

Preferably, the composition comprises a hectorite, an organomodified bentonite or an optionally modified fumed silica.

When it is present, the mineral thickener represents from 1% to 30% by weight relative to the weight of the composition.

The composition may also comprise one or more organic thickeners.

These thickeners may be chosen from fatty acid amides (coconut monoethanolamide or diethanolamide, oxyethylenated carboxylic acid monoethanolamide alkyl ether), polymeric thickeners such as cellulose-based thickeners (hydroxyethylcellulose, hydroxypropylcellulose or carboxymethylcellulose), guar gum and derivatives thereof (hydroxypropyl guar), gums of microbial origin (xanthan gum, scleroglucan gum), acrylic acid or acrylamidopropanesulfonic acid crosslinked homopolymers and associative polymers (polymers comprising hydrophilic regions and fatty-chain hydrophobic regions (alkyl or alkenyl containing at least 10 carbon atoms) that are capable, in an aqueous medium, of reversibly combining with each other or with other molecules).

According to one particular embodiment, the organic thickener is chosen from cellulose-based thickeners (hydroxyethylcellulose, hydroxypropylcellulose or carboxymethylcellulose), guar gum and derivatives thereof (hydroxypropyl guar), gums of microbial origin (xanthan gum or scleroglucan gum) and crosslinked acrylic acid or acrylamidopropanesulfonic acid homopolymers, and preferably from cellulose-based thickeners in particular with hydroxyethylcellulose.

The content of organic thickener(s), if they are present, usually ranges from 0.01% to 20% by weight relative to the weight of the dye composition or ready-to- use composition, preferably from 0.1 % to 5% by weight of the dye composition or ready-to-use composition. Medium of the composition(s) of the invention

The dye composition, the ready-to-use composition and the compositions used in the process for dyeing keratin fibres are cosmetically acceptable, i.e. they contain a cosmetically or physiologically acceptable non-toxic medium that may be applied especially to keratin materials, i.e. human hair and/or skin.

The cosmetically acceptable medium generally comprises at least water or a mixture of water and of at least one organic solvent. Organic solvents

The composition(s) according to the present invention are preferably aqueous and/or also comprise one or more organic solvents. Organic solvents

According to a preferred embodiment, the dye composition according to the invention comprises at least one organic solvent.

According to a particular embodiment, the dye composition according to the invention comprises at least one liquid organic solvent with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2.

In the context of the present invention, such a compound is also known as a hydrotropic compound.

For the purposes of the present invention, the term "hydrotropic compound" means a compound that is capable of increasing the solubility of hydrophobic compounds in aqueous phases.

Said liquid compounds more preferentially have a Hansen solubility parameter δΗ of between 5 and 15.8 MPa 1/2 , even more preferentially between 8 and 15.8 MPa ^1/2 and better still between 8 and 15 MPa ^1/2 .

These compounds are liquid at a temperature of 25°C and at atmospheric pressure (760 mmHg; i.e. 1.013 10 ⁵ Pa).

The compound(s) with a Hansen solubility parameter value δΗ as defined previously are, for example, described in the reference publication Hansen solubility parameters: A User's Handbook by Charles M. Hansen, CRC Press, 2000, pages 167 to 185, or in the publication Handbook of Solubility Parameters and Other Cohesion Parameters, CRC Press, pages 95 to 121 and pages 177 to 185.

This solubility parameter value δΗ is associated with the formation of hydrogen bonds. It may be recalled that there are three major types of interaction in organic compounds: non-polar interactions, permanent dipole-dipole interactions and interactions of hydrogen bonding type, the latter forming the subject of the parameter defining the hydrotropic compound present in the composition used in accordance with the invention.

In particular, the book Handbook of Solubility Parameters and Other Cohesion Parameters, CRC Press, pages 95 to 121 and pages 177 to 185, gives the equation δΗ = (∑- ^z \J _h /V)

in which ¾ (in J.mol ^"1 ) describes the contributions of the functional group considered in the solubility parameters associated with the hydrogen bonds (values in Table 14, page 183), this parameter ¾ also being described in the book "The relation between surface tension and solubility parameter in liquids", Bagda, E, Farbe Lack, 84, 212, 1978; and V is the volume of the molecule.

It should be noted that the solubility parameter value δΗ is usually given for a temperature of 25°C and at atmospheric pressure (760 mmHg, i.e. 1.013 x 10 ⁵ Pa).

In particular, the liquid organic compounds with a Hansen solubility

1/2

parameter value δΗ of greater than 0 and less than 16 MPa are nonionic compounds.

Said liquid organic compound(s) with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2 may be chosen from:

• alcohol ethers, in particular C ₁ -C ₄ ethers of C5-C30 alcohols, which are preferably saturated, linear or branched, optionally interrupted with one or more non- adjacent ether functions;

• aliphatic esters of C ₁ -C ₄ carboxylic acids and of C3-C ₁₀ monohydroxylated alcohols or polyhydroxylated alcohols, interrupted with one or more non- adjacent ether functions;

· aromatic ethers, in particular of C ₆ -Cio, of a Ci-C ₆ alkyl optionally bearing a hydroxy 1 group,

(C6-Cio)aryl(Ci-Ce) alkyl ethers, of a Ci-C ₆ alkyl optionally bearing a hydroxyl group, • alkanols bearing an aryl substituent, preferably for which the aryl part is C ₆ -Cio, advantageously C ₆ , and the alkyl part of the alkanol is C1-C4, this alkyl part possibly ending or being interrupted with a heteroatom, advantageously oxygen or a hydroxyl group, preferably such as benzyl alcohol;

· lactones preferably of formula (iii), and also mixtures thereof, with:

in which R' represents a hydrogen, a linear or branched Ci-Cs alkyl, a linear or branched C1-C4 hydroxyalkyl, n being equal to 1, 2 or 3, and preferably R' represents a hydrogen, a linear or branched Ci-C ₆ alkyl or a linear or branched C1-C2 hydroxyalkyl.

A particularly advantageous example of lactones that may be mentioned is γ- butyrolactone.

Mention may also be made of certain liquid alkanols, for instance 1- pentanol.

Preferably, said liquid organic compound(s) with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2 are chosen from alcohol ethers, aliphatic esters, aromatic ethers and alkanols bearing aryl substituents, and mixtures thereof.

Even more preferentially, said liquid organic compound(s) according to the invention are chosen from dipropylene glycol monomethyl ether acetate, dipropylene glycol methyl ether, dipropylene glycol mono-n-butyl ether (the INCI name of which is PPG-2 Butyl Ether), tripropylene glycol methyl ether, propylene glycol n-butyl ether, propylene glycol n-propyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether and monoethyl ether, 3 -phenyl- 1-propanol, 2- phenyl- 1-propanol, benzyl alcohol, benzyloxyethanol and phenoxyethanol, and mixtures of these compounds.

The liquid organic compound(s) with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2 are even more preferentially chosen from alkanols bearing aryl substituents and even more preferentially benzyl alcohol and/ or phenoxy ethano 1. Preferably, when they are present in the composition, the liquid organic compound(s) with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2 represent a total content ranging from 0.1% to 35% by weight, preferably from 0.5% to 20% by weight and better still from 0.5% to 10% by weight relative to the total weight of the dye composition.

Preferably, when the composition according to the invention comprises at least one oxidizing agent, the liquid organic compound(s) with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2 represent, when they are present, a total content ranging from 0.1% to 35% by weight, preferably from 0.1% to 20% by weight and better still from 0.5% to 10% by weight relative to the total weight of the composition containing them.

Additional organic solvent Furthermore, the composition(s) may also comprise at least one additional organic solvent, other than the organic solvents with a Hansen solubility parameter value δΗ of greater than 0 and less than 16 MPa 1/2

Examples of additional organic solvents that may be mentioned include linear or branched C2-C4 alkanols, such as ethanol and isopropanol; glycerol; polyols such as 1,3-propanediol or 1,6-hexanediol and polyol ethers, for instance 2- butoxyethanol, propylene glycol, dipropylene glycol, propylene glycol mo no methyl ether, diethylene glycol monoethyl ether and mo no methyl ether, and also aromatic alcohols or ethers, and mixtures thereof.

The total content of additional organic solvent(s), when they are present in the composition of the invention, preferably ranges from 1% to 40% by weight and more preferentially from 5% to 30% by weight, relative to the total weight of the composition containing them.

The composition of the invention may be in various forms, for instance a solution, an emulsion (milk or cream) or a gel.

According to one embodiment, the composition according to the invention comprises one or more oxidation bases and one or more aminobenzene couplers of formula (I), as described previously, and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof. According to one embodiment, the composition according to the invention comprises:

(i) one or more oxidation bases,

(ii) one or more aminobenzene couplers of formula (I), as described previously, and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof,

(iii) one or more fatty substances,

(iv) one or more surfactants,

(v) one or more basifying agents, and

(vi) one or more chemical oxidizing agents.

Preferably, the content of fatty substances is greater than or equal to 10% by weight, preferably in a content ranging from 10%> to 80%> by weight, advantageously from 15% to 80% by weight and more preferentially from 20% to 80% by weight relative to the weight of the composition.

In accordance with this embodiment, the fatty substance content advantageously ranges from 25% to 80%> by weight, preferably from 30%> to 70%> by weight and even more advantageously from 30% to 60% by weight relative to the weight of the composition.

According to a preferred embodiment, the composition according to the present invention comprises:

(i) one or more non-silicone fatty substances, which are liquid at a temperature of 25°C and at atmospheric pressure, not containing any C2-C3 (poly)oxyalkylene units or any (poly)glycerol units,

(ii) one or more surfactants chosen from nonionic surfactants,

(iii) one or more oxidation bases chosen especially from heterocyclic bases and benzene-based bases, the addition salts thereof and/or the solvates thereof,

(iv) one or more basifying agents chosen from alkanolamines, amino acids in neutral or ionic form, or mixtures thereof,

(v) one or more aminobenzene couplers of formula (I), as described previously, and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof,

(vi) one or more chemical oxidizing agents, the fatty substance content representing in total at least 10% by weight, advantageously at least 20%> by weight, preferably at least 25% by weight of fatty substance relative to the total weight of said composition.

Preferentially, in this embodiment, the aminobenzene coupler(s) are chosen from the compounds of formulae (IA) and (IB), and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof.

Processes

The process for dyeing keratin fibres, in particular human keratin fibres such as the hair, consists in applying to said fibres the composition according to the invention in the presence of one or more chemical oxidizing agents.

In particular, the dye composition used in the process according to the invention is applied to wet or dry keratin fibres.

It is usually left in place on the fibres for a time generally of from 1 minute to 1 hour and preferably from 5 minutes to 30 minutes.

The temperature during the dyeing process conventionally ranges from room temperature (between 15°C and 25°C) to 80°C, preferably from room temperature to 60° C.

On conclusion of the treatment, the human keratin fibres are advantageously rinsed with water. They may optionally be washed with a shampoo, followed by rinsing with water, before being dried or left to dry.

Preferably, the process for dyeing keratin fibres consists in applying to said fibres a composition according to the invention comprising:

(i) one or more oxidation bases,

(ii) one or more aminobenzene couplers of formula (I), as described previously, and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof, (iii) one or more fatty substances,

(iv) one or more surfactants,

(v) one or more basifying agents, and

(vi) one or more chemical oxidizing agents;

the fatty substance content preferably being greater than or equal to 10% by weight, more preferentially in a content ranging from 10% to 80% by weight, advantageously from 15% to 80% by weight and even more preferentially from 20% to 80% by weight relative to the weight of the composition.

The composition applied in the process according to the invention is generally prepared by extemporaneous mixing of at least two compositions, preferably two or three compositions.

In a first variant of the invention, the composition applied in the process according to the invention, also known as the "ready-to-use" composition, is derived from the extemporaneous mixing of two compositions.

In particular, a composition (A) (free of chemical oxidizing agent) comprising one or more oxidation bases and one or more aminobenzene couplers of formula (I), and also the addition salts thereof, the optical isomers, geometrical isomers and tautomers thereof and/or the solvates thereof, and a composition (B) comprising one or more chemical oxidizing agents as defined previously, are mixed.

For the purposes of the present invention, the term "free of refers to a composition which does not contain any or which contains less than 0.1% by weight of chemical oxidizing agent relative to the total weight of the composition.

At least one of the compositions (A) and (B) is advantageously aqueous.

The term "aqueous composition" means a composition comprising at least 5% by weight of water, relative to the weight of this composition.

Preferably, an aqueous composition comprises more than 10% by weight of water and even more advantageously more than 20% by weight of water.

In accordance with this first variant, the dyeing process according to the invention consists, in a first step, in mixing composition (A) and composition (B), as defined previously, just before application to the keratin fibres, and, in a second step, in applying to said keratin fibres the composition derived from the mixing of compositions (A) and (B).

In a second variant of the invention, the composition applied in the process according to the invention is derived from the extemporaneous mixing of three compositions. In particular, the three compositions are aqueous or alternatively at least one of them is anhydrous.

For the purposes of the invention, the term "anhydrous composition" means a composition having a water content of less than 5% by weight, preferably less than 2% by weight and even more preferably less than 1% by weight relative to the weight of said composition. It should be noted that the water present in the composition is more particularly "bound water", such as the water of crystallization in salts, or traces of water absorbed by the starting materials used in the preparation of the compositions according to the invention.

Preferably, use is made of two aqueous compositions (Bl) and (CI) and one anhydrous composition (Al).

The anhydrous composition (Al) (free of chemical oxidizing agent) then preferably comprises one or more fatty substances, and more preferentially one or more fatty substances that are liquid at room temperature and atmospheric pressure.

Composition (Bl) (free of chemical oxidizing agent) then preferably comprises one or more oxidation bases and one or more aminobenzene couplers of formula (I).

Composition (CI) then preferably comprises one or more chemical oxidizing agents.

According to this preferred mode of the second variant, the basifying agent(s) are included in compositions (Al) and/or (Bl) and preferably only in composition (Bl). As regards the surfactant(s), they are included in at least one of compositions (Al), (Bl) and (CI).

According to this preferred mode, the composition according to the invention, i.e. the composition derived from the extemporaneous mixing of the three compositions (Al), (Bl) and (CI), has a fatty substance content of at least 10% by weight, more particularly at least 15% by weight, preferably at least 20% by weight and even more advantageously at least 25% by weight of fatty substance, relative to the weight of the composition derived from the mixing of the three abovementioned compositions.

In this variant, compositions (Al), (Bl) and (CI) are preferably mixed together in a weight ratio [(A1)+(B1)]/(C1) ranging from 0.2 to 10 and more particularly from 0.5 to 2 and in a weight ratio (A1)/(B1) ranging from 0.5 to 10 and preferably from 1 to 5.

In accordance with this second variant, the dyeing process according to the invention consists, in a first step, in mixing compositions (Al), (Bl) and (CI), as defined previously, just before application to the keratin fibres, and, in a second step, in applying to said keratin fibres the composition derived from the mixing of compositions (Al), (Bl) and (CI). Devices

The invention relates to a first multi-compartment device comprising a first compartment containing composition (A), as described above, and at least a second compartment containing composition (B), as described above; compositions (A) and (B) of the compartments being intended to be mixed before application, to give a composition according to the invention.

The invention also relates to a second multi- compartment device comprising a first compartment containing composition (Al) as described above and a second compartment containing a cosmetic composition (Bl) as described above and at least a third compartment comprising composition (CI) as described above, the compositions of the compartments being intended to be mixed before application to give the composition according to the invention; the amount of fatty substance in the composition representing at least 10% by weight, more particularly at least 15% by weight, preferably at least 20% by weight and even more advantageously at least 25% by weight relative to the weight of the composition according to the invention, i.e. of the composition derived from the mixing of compositions (Al), (Bl) and (CI).

The present invention also relates to the use of the dye composition as described previously for dyeing keratin fibres, in particular human keratin fibres such as the hair.

The examples that follow serve to illustrate the invention without, however, being limiting in nature.

In the examples that follow, the colour build-up (AE _a b*) was evaluated in the CIE L* a* b* system.

In this L*a*b* system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* indicates the blue/yellow colour axis. The lower the value of L*, the darker or more intense the colour.

The value of AE _a b* was calculated from the values of L*a*b* according to equation (i) below:

The colour build-up (AE _La b*) was calculated from the colorimetric values for locks of untreated hair (L ₀ *, ao* and bo*) and locks for dyed hair (L*, a* and b*).

The greater the value of AE _a b*, the better the colour build-up for the treated fibres.

In the examples that follow, all the amounts are given as weight percentages of active material relative to the total weight of the composition, unless otherwise indicated.

L Example 1 a. Compositions tested Compositions (Α'), (Β') and (C) below were prepared from the ingredients as described below, the contents of which are indicated in grams (unless otherwise mentioned) in the tables below.

Composition a*

Liquid petroleum jelly 64.5

2-Octyldodecanol 11.5

Distearyldimethylammonium-modified 3

hectorite

Propylene carbonate 1

Oxyethylenated (4 OE) sorbitan 11

monolaurate

Glycol distearate 8

Oxyethylenated (2 OE) lauryl alcohol 1

Total 100

Composition C

50% hydrogen peroxide solution 12

Liquid petroleum jelly 20

Cetylstearyl alcohol (30/70 Ci ₆ /Ci ₈ ) 8

Oxyethylenated (33 OE) cetylstearyl 3 alcohol

Tetrasodium pyrophosphate decahydrate 0.03

Crystalline sodium 0.04 hexahydroxystannate

Diethylenetriaminepentaacetic acid,

pentasodium salt as an aqueous 40% 0.15 solution

Polydimethyldiallylammonium chloride

at 40% in water, non-stabilized 0.5

Poly[(dimethylimino)- 1,3- propanediyl(dimethylimino)- 1 ,6- hexanediyl dichloride] as an aqueous 0.25 60%) solution

Phosphoric acid qs pH 2.2

Oxyethylenated (4 OE) rapeseed acid 1.3 amides

Vitamin E 0.1

Glycerol 0.25

Water qs 100

x Oxidation bases tested

The oxidation bases used in composition (B) are indicated in the table below:

Aminobenzene couplers tested

The aminobenzene couplers used in composition (B) are indicated in the table below:

d. Procedure

At the time of use, 3.35 g of composition (A) are mixed with 1.35 g of composition (Β') and 5 g of composition (C).

The mixture obtained is then applied to locks of permanent-waved hair containing 90% grey hairs (PWG), at a rate of 9.7 g of composition per 1 g of lock.

After a leave-on time of 30 minutes at a temperature of 40°C, the locks are rinsed, washed with a standard shampoo and then dried under a hood.

The colouring obtained was measured using a Minolta CM-3600D spectrocolorimeter. e. Results

The colouring results are collated in the following tables:

L* a* b* AE _ab *ab Colour

Description

(D65) (D65) (D65) h (D65) obtained

Reference

Undyed hair 65.74 0.97 17.03 - -

For coupler 1 violet with base (A) 21.27 10.17 -0.53 48.7 with base (B) 27.33 -8.25 -4.86 45.16 blue blue with base (C) 25.64 -7.16 -1.09 44.75 purple with base (D)

23.06 22.7 4.86 47.3 with base (E) 40.26 31.84 15.29 42.18 red

For coupler 2 blue with base (A)

20.12 -0.08 -2.61 49.68

green with base (B)

31.55 -7.11 11.98 35.5 with base (C) 27.9 3.14 5.39 39.65 brown violet with base (D)

19.98 7.6 2.16 48.04

golden with base (E)

58.56 8.7 26.45 16.11

Very intense colourings with varied glints having very good colour build-up are obtained.

Examples - Couplers (4), (5) and (35) tested a. Compositions tested

Compositions (A), (Β') and (C) are identical to those used in Example I. b. Oxidation bases tested

The oxidation bases used in composition (Β') correspond to those used in Example I. c. Aminobenzene couplers tested

The aminophenylene couplers used in composition (Β') are indicated table below:

d. Procedure

The procedure is identical to that described in Example I. e. Results

The colouring results are collated in the following tables:

L* a* b* AE _ab *ab Colour

Description

(D65) (D65) (D65) (D65) obtained

Reference

-

Undyed hair 65.74 0.97 17.03 -

For coupler 4 violet with base (A) 32.83 7.45 0.55 37.37

green with base (B) 36.58 -16.16 2.02 33.88

light with base (C) 45.7 -1.74 10.47 18.6

green red with base (D)

27.3 25.86 10.58 44.7

golden with base (E) 55.94 17.46 24.16 22.26

For coupler 5 brown

27.88

with base (A) 39.35 13.62 9.76

For coupler 35 with base (A) 22.11 -1.43 -7.42 49.3 with base (B) 34.79 -13.58 7.59 35.0 with base (C) 30.28 -0.36 5.26 37 with base (D) 20.11 7.31 -0.03 48.8

Very intense colourings with varied glints are obtained.