Use of at least one oxidizing composition free of phosphoric acid to improve the properties of keratin fibres

Abstract

The present invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising one or more chemical oxidizing agents, during a process for the oxidation dyeing of keratin fibres, to improve the cosmetic properties, in particular the sheen, and the dyeing properties of said fibres. The invention also relates to a process for dyeing keratin fibres, preferably human keratin fibres, such as the hair, comprising at least the use of at least one oxidizing composition (C2), as defined above, in combination with at least one dye composition (C1) comprising one or more oxidation dyes.

Description

[0001] DESCRIPTION

[0002] TITLE: Use of at least one oxidizing composition free of phosphoric acid to improve the properties of keratin fibres

[0003] The present invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising one or more chemical oxidizing agents, during a process for the oxidation dyeing of keratin fibres, to improve the cosmetic properties, in particular the sheen, and the dyeing properties of said fibres.

[0004] The invention also relates to a process for dyeing keratin fibres, preferably human keratin fibres, such as the hair, comprising at least the use of at least one oxidizing composition (C2), as defined above, in combination with at least one dye composition (Cl) comprising one or more oxidation dyes.

[0005] Similarly, the present invention relates to a composition (CM) obtained by mixing at least one dye composition (CM1) comprising (i) at least one oxidation dye, (ii) at least one fatty acid, (iii) at least one alkaline agent, (iv) at least one nonionic surfactant of alkyl polyglucoside type, and at least one oxidizing composition (C2) as defined below.

[0006] The invention also relates to a composition (CM’) obtained by mixing at least one dye composition (CM’ l) comprising (i) at least one fatty acid, (ii) at least one alkaline agent, and (iii) at least one oxidation dye, other than resorcinol, 2- methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof or solvates of salts thereof, and at least one oxidizing composition (C2) as defined below.

[0007] In the field of dyeing, it is known to dye keratin fibres, in particular human keratin fibres such as the hair, by means of various techniques using direct dyes for non-permanent dyeing, or oxidation dye precursors for permanent dyeing.

[0008] Oxidation dye processes generally use dye compositions comprising one or more oxidation dye precursors, in particular oxidation bases, such as ortho- or paraphenylenediamines, ortho- or para-aminophenols or heterocyclic compounds such as pyrazoles, pyrazolinones or pyrazolopyridines. These oxidation bases are colourless or weakly coloured compounds, which, when mixed with oxidizing agents, may give rise to coloured compounds by a process of oxidative condensation.

[0009] It is also possible to vary the shades obtained with such oxidation bases by combining them with couplers or colouring modifiers. The variety of the molecules employed as oxidation bases and couplers makes it possible to obtain a rich palette of colours.

[0010] At the time of use, the dye compositions are generally mixed with oxidizing compositions, comprising one or more oxidizing agents, then applied to the keratin fibres. After a leave-on time, the keratin fibres are then usually rinsed with water, then washed, one or more times with shampoos, and optionally dried in order to result in the desired colouring.

[0011] However, the use of such compositions may lead to a certain number of drawbacks, in particular to unsatisfactory dyeing and cosmetic performances which may be due to the quality of the water used during such a dyeing process, in particular as a function of its relatively high limescale content.

[0012] Specifically, during the implementation of the oxidation dyeing processes, the limescale present in the water can give rise to the formation of insoluble complexes and / or salts that can be deposited on the keratin fibres, impacting the desired dyeing and cosmetic performances. In particular, such processes may, on the one hand, lead to unsatisfactory colourings, in particular by providing the fibres with colourings which lack chromaticity, having less attractive, less uniform, duller and less shiny tints.

[0013] In other words, the oxidation dyeing processes can result in unsatisfactory dyeing and cosmetic performances that can be degraded depending on the water quality conditions, in particular its hardness.

[0014] In addition, the dyeing and cosmetic performances may vary depending on the water quality conditions, i.e. according to the geographical location of the consumer(s), even though the same dye composition is used.

[0015] Thus, there is a real need to use a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, which does not have the abovementioned drawbacks, that is to say, which is capable of leading to improved dyeing and cosmetic performances independently of the water quality conditions, in particular its hardness, in particular its content of limescale or calcium ions.

[0016] In particular, there is a real need to use an oxidation dyeing process capable of leading to satisfactory dyeing and cosmetic properties while minimizing the deposition of insoluble complexes and / or salts on the keratin fibres.

[0017] Also in particular, 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 abovementioned drawbacks, that is to say, which is capable of leading to improved dyeing and cosmetic performances independently of the water quality conditions, in particular its hardness, in particular its content of limescale or calcium ions.

[0018] Therefore, one subject of the present invention is in particular the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising one or more chemical oxidizing agents, during a process for the oxidation dyeing of keratin fibres, preferably human keratin fibres, such as the hair, for improving their cosmetic properties, notably the sheen, smooth feel, natural feel, ease of disentangling, improvement of the alignment and visual appearance of fibres, and their dyeing properties, in particular by resulting in more chromatic and more uniform colourings.

[0019] The use according to the invention makes it possible to achieve the above objectives, in particular by leading to dyeing and cosmetic performances which are improved and constant, that is to say which depend as little as possible on the quality conditions of the water used, in particular on its hardness, and more particularly on its content of mineral salts, even more particularly on its content of calcium ions.

[0020] In other words, the use of an oxidizing composition (C2) according to the invention, during the implementation of an oxidation dyeing process, thus makes it possible to reduce the deposits of insoluble complexes and / or mineral salts on the keratin fibres capable of impacting the desired dyeing and / or cosmetic performance.

[0021] In yet other words, the use of an oxidizing composition (C2) according to the invention makes it possible to prevent deposits of insoluble complexes and / or mineral salts, capable of occurring during the implementation of an oxidation dyeing process, thus constantly ensuring that good dyeing and cosmetic properties are obtained.

[0022] The use of the oxidizing composition (C2) during such an oxidation dyeing process makes it possible in particular to achieve more chromatic colourings, having shades with more attractive and more uniform tints.

[0023] Moreover, the use of the oxidizing composition (C2) makes it possible to obtain improved cosmetic properties, in particular in terms of sheen, smooth feel, natural feel, ease of disentangling, improvement in alignment and visual appearance of the fibres, in particular sheen.

[0024] Advantageously, the use of the oxidizing composition (C2) makes it possible to improve the sheen of the keratin fibres while leading to improved dyeing performance with more chromatic colourings, having shades with more attractive and more uniform tints.

[0025] Thus, the keratin fibres treated are less dull, shinier and have a more chromatic and more uniform colouring. In other words, the use of the oxidizing composition (C2) according to the invention makes it possible to improve the cosmetic properties, advantageously the sheen of the keratin fibres, and the dyeing properties of a process for oxidation dyeing of said fibres, in particular by imparting more chromatic colourings, having shades with more attractive and more uniform tints.

[0026] Even more advantageously, the use of an oxidizing composition (C2) according to the invention, during an oxidation dyeing process, results in better dyeing and / or cosmetic performances than an oxidizing composition comprising at least one phosphoric acid used in the same oxidation dyeing process.

[0027] Another subject of the present invention is a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, for improving the cosmetic properties of said keratin fibres, comprising at least the use of at least one oxidizing composition (C2), as defined above, in combination with at least one dye composition (Cl) comprising one or more oxidation dyes.

[0028] Preferably, the dyeing process comprises at least the mixing of at least said oxidizing composition (C2) with at least said dye composition (Cl), and at least the application to said keratin fibres of the composition resulting from said mixing.

[0029] The oxidizing composition (C2) also has good usage properties, such as a creamy texture, and is easy and quick to mix with a dye composition (Cl).

[0030] The composition, resulting from the mixing of the oxidizing composition (C2) and the dye composition (Cl), is thus obtained easily and quickly following mixing of the oxidizing composition (C2) and a dye composition (Cl) and is stable during application.

[0031] Advantageously, the dyeing process makes it possible to improve the sheen of the keratin fibres and the dyeing properties of the fibres by imparting more chromatic colourings, having shades with more attractive and more uniform tints.

[0032] Another subject of the present invention relates to a composition (CM) obtained by mixing: at least one dye composition (CM1) comprising:

[0033] (i) one or more oxidation dyes,

[0034] (ii) one or more fatty acids,

[0035] (iii) one or more alkaline agents, and

[0036] (iv) one or more nonionic surfactants of alkyl polyglucoside type, and at least one oxidizing composition (C2), free of phosphoric acid, comprising: (v) one or more chemical oxidizing agents, and

[0037] (vi) one or more carboxylic acids other than the fatty acid(s) (ii).

[0038] Yet another subject of the present invention relates to a composition (CM’) obtained by mixing: at least one dye composition (CM’ 1) comprising:

[0039] (i) one or more fatty acids,

[0040] (ii) one or more alkaline agents, and

[0041] (iii) one or more oxidation dyes, other than resorcinol, 2- methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof and solvates of salts thereof, and at least one oxidizing composition (C2), free of phosphoric acid, comprising:

[0042] (iv) one or more chemical oxidizing agents, and

[0043] (v) one or more carboxylic acids other than the fatty acid(s) (i).

[0044] The composition according to the invention (CM) or (CM’) makes it possible to achieve the above objectives, in particular by leading to dyeing and cosmetic performances which are improved and constant, that is to say which depend as little as possible on the quality conditions of the water used, in particular on its hardness, and more particularly on its content of mineral salts, even more particularly on its content of calcium ions.

[0045] In other words, the composition according to the invention (CM) or (CM’) thus makes it possible to reduce the deposits of insoluble complexes and / or mineral salts on the keratin fibres capable of having an impact on the dyeing and cosmetic performances thereof.

[0046] In yet other words, the composition according to the invention (CM) or (CM’) makes it possible to prevent deposits of insoluble complexes and / or mineral salts, capable of occurring during the implementation of an oxidation dyeing process, thus constantly ensuring that good dyeing and cosmetic properties are obtained.

[0047] The composition according to the invention (CM) or (CM’) thus makes it possible to obtain more chromatic colourings, having shades with more attractive and more uniform tints.

[0048] The composition according to the invention (CM) or (CM’) also has good usage properties, in particular a creamy texture, and is stable during application to keratin fibres. The composition according to the invention (CM) or (CM’) also has the advantage of being obtained following an easy and rapid mixing of the dye composition (CM1) or (CM’ 1) and the oxidizing composition (C2).

[0049] Moreover, the composition according to the invention (CM) or (CM’) makes it possible to obtain improved cosmetic properties, in particular in terms of sheen, smooth feel, natural feel, ease of disentangling, improvement in alignment and visual appearance of the fibres.

[0050] Advantageously, the composition according to the invention (CM) or (CM’) makes it possible to improve the sheen of the keratin fibres while leading to improved dyeing performance with more chromatic colourings, having shades with more attractive and more uniform tints.

[0051] Thus, the keratin fibres treated are less dull, shinier and have a more chromatic and more uniform colouring.

[0052] Even more advantageously, the composition according to the invention obtained by mixing with at least one oxidizing composition (C2), as defined above, comprising at least one carboxylic acid, results in improved dyeing and cosmetic performances, relative to a composition obtained by mixing an oxidizing composition comprising at least one phosphoric acid.

[0053] In the text hereinbelow and unless otherwise indicated, the limits of a range of values are included in that range, especially in the expressions '''between'' and “ ranging from ... to

[0054] Moreover, the expression “at least one” used in the present description is equivalent to the expression "one or more".

[0055] Similarly, the expression “at least” used in the present description is equivalent to the expression “ greater than or equal to” .

[0056] Use

[0057] As indicated above, the present invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, as defined below, during the implementation of a process for the oxidation dyeing of keratin fibres, preferably human keratin fibres such as the hair, for improving the cosmetic and dyeing properties of said fibres.

[0058] In other words, the use of at least one oxidizing composition (C2) according to the invention, during the implementation of a process for the oxidation dyeing of keratin fibres, makes it possible to improve the cosmetic properties and the dyeing properties of said fibres.

[0059] For the purposes of the present invention, the expression “use of at least one oxidizing composition (C2) during an oxidation dyeing process” means an oxidizing composition (C2), as defined below, intended to be used sequentially, simultaneously or to be mixed at the time of use, with a dye composition (Cl) comprising one or more oxidation dyes.

[0060] For the purposes of the present invention, the expression “improvement of the cosmetic properties and of the dyeing properties of keratin fibres” is understood to mean an improvement compared with keratin fibres that have not been dyed or cosmetically treated.

[0061] For the purposes of the present invention, the term “undyed keratin fibres” means keratin fibres that have not been dyed by a dyeing process.

[0062] Especially, the term “undyed keratin fibres” means keratin fibres that have not been dyed with one or more dyeing agents.

[0063] For the purposes of the present invention, the term “keratin fibres that are not cosmetically treated” means keratin fibres that have not been treated by a cosmetic treatment process, for example a process for conditioning keratin fibres.

[0064] Preferably, the oxidizing composition (C2) is intended to be mixed at the time of use with a dye composition (Cl) comprising one or more oxidation dyes.

[0065] In other words, according to a preferred embodiment, the oxidizing composition (C2) is intended to be mixed extemporaneously with a dye composition (Cl) comprising one or more oxidation dyes.

[0066] Preferably, the invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising one or more chemical oxidizing agents, in a preparation of at least one ready-to-use oxidation dye composition, for improving the cosmetic properties of keratin fibres, preferably human keratin fibres such as the hair.

[0067] For the purposes of the present invention, the expression “ready-to-use oxidation dye composition” means a dye composition resulting from the mixing of at least the oxidizing composition (C2), as defined below, and at least the dye composition (Cl) as defined below.

[0068] In other words, according to a preferred embodiment, the invention relates to the use of at least one oxidizing composition (C2), as defined below, mixed at the time of use with a dye composition (Cl) comprising one or more oxidation dyes, for improving the cosmetic properties of the keratin fibres.

[0069] Preferably, the use of the oxidizing composition (C2) according to the invention makes it possible to improve the sheen, the natural feel, the smooth feel, the suppleness, the disentangling, the alignment and the visual appearance of the keratin fibres and to obtain more chromatic and uniform colourings.

[0070] More preferentially, the use of the oxidizing composition (C2) according to the invention makes it possible to improve the sheen of the keratin fibres.

[0071] Advantageously, the invention relates to the use of at least one oxidizing composition (C2) according to the invention, in a preparation of at least one ready -to- use oxidation dye composition, for improving the sheen and the dyeing properties of keratin fibres, preferably human keratin fibres such as the hair.

[0072] Preferably, the use of the oxidizing composition (C2) according to the invention also makes it possible to improve the cosmetic and dyeing properties of a process for the oxidation dyeing of keratin fibres, in particular by improving their sheen and by leading to more chromatic and uniform colourings.

[0073] Oxidizing composition (C2)

[0074] The oxidizing composition (C2) used according to the invention is free of phosphoric acid.

[0075] In addition, the oxidizing composition (C2) used according to the invention is free of oxidation dye.

[0076] Chemical oxidizing agent

[0077] For the purposes of the present invention, the term “chemical oxidizing agent” is understood to mean an oxidizing agent other than atmospheric oxygen.

[0078] The chemical oxidizing agent(s) (or bleaching agents) which can be used in the present invention can be chosen from hydrogen peroxide, urea hydrogen peroxide, alkali metal bromates, persalts, such as perborates and persulfates, in particular sodium persulfate, potassium persulfate and ammonium persulfate, peracids and oxidase enzymes (with their optional cofactors), among which mention may be made of peroxidases, 2-electron oxidoreductases, such as uricases, and 4-electron oxygenases, such as laccases, and mixtures thereof.

[0079] More preferentially, the chemical oxidizing agent(s) is or are chosen from hydrogen peroxide, persalts, and mixtures thereof, more preferably hydrogen peroxide. Preferably, the chemical oxidizing agent(s) is or are present in a total content ranging from 0.1% to 50%, more preferentially from 0.5% to 20% by weight, even more preferentially ranging from 1% to 15% by weight, relative to the total weight of the composition (C2).

[0080] According to a preferred embodiment, the chemical oxidizing agent(s) chosen from hydrogen peroxide, persalts and mixtures thereof are present in a total content ranging from 0.1% to 50% by weight, more preferentially from 0.5% to 20% by weight, more preferentially still from 1% to 15% by weight, relative to the total weight of the composition (C2).

[0081] The oxidizing composition (C2) may also comprise one or more carboxylic acids other than the fatty acids.

[0082] Preferably, the carboxylic acid(s) correspond(s) to the following formula (I) and / or a salt thereof: in which:

[0083] - U represents a saturated or unsaturated, cyclic or non-cyclic, aromatic or nonaromatic, monovalent, when n has the value 0, or polyvalent, when n is greater than or equal to 1, hydrocarbon group comprising from 1 to 8 carbon atoms which is optionally interrupted by one or more heteroatoms and / or optionally substituted, in particular by one or more hydroxy groups; preferably, U represents a monovalent (Ci-Ce)alkyl group or a polyvalent (Ci-Ce)alkylene group optionally substituted by one or more hydroxy and / or amino groups;

[0084] - n represents an integer of between 0 and 10 inclusive; preferably, n is between 0 and

[0085] 5, such as between 0 and 2.

[0086] The carboxylic acid(s) of formula (I) is or are preferably chosen from a- hydroxy acids.

[0087] Mention may be made, as preferred examples of carboxylic acids of formula (I), of glycolic acid, citric acid, lactic acid, tartaric acid or a salt thereof, preferably glycolic acid or lactic acid or a salt thereof, better still lactic acid, citric acid and / or a salt thereof.

[0088] Advantageously, the carboxylic acid of formula (I) is citric acid or a salt thereof. The salts of the acids of formula (I) can be salts of organic or inorganic bases or of basifying agents as defined above.

[0089] The carboxylic acid(s) is or are present in a total content ranging from 0.01% to 30% by weight, preferably from 0.1% to 20% by weight, more preferentially from 0.2% to 15% by weight, relative to the total weight of the oxidizing composition (C2).

[0090] The oxidizing composition (C2) is preferably an aqueous composition.

[0091] In particular, the oxidizing composition (C2) comprises more than 5% by weight of water, preferably more than 10% by weight of water, and even more advantageously more than 20% by weight of water.

[0092] It may also comprise one or more organic solvents chosen from those listed previously; these solvents more particularly representing, when they are present, from 0.1% to 40% by weight relative to the weight of the oxidizing composition, and preferably from 0.2% to 30% by weight, more preferentially from 0.3% to 20% by weight, better still from 0.4% to 10% by weight and even better still from 0.5% to 5% by weight of the total weight of the composition.

[0093] As indicated above, the oxidizing composition (C2) is free of phosphoric acid.

[0094] Preferably, the oxidizing composition (C2) may also preferably comprise one or more acidifying agents other than the carboxylic acid(s) of formula (I), as defined above, such as hydrochloric acid or sulfuric acid.

[0095] The oxidizing composition (C2) is preferably aqueous and preferentially has a pH of less than 7, more preferentially between 2 and 5, better still between 3 and 4.5.

[0096] Advantageously, the invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising citric acid or a salt thereof, during the implementation of a process for the oxidation dyeing of keratin fibres, preferably human keratin fibres, such as the hair, for improving the cosmetic and dyeing properties of said fibres.

[0097] Also advantageously, the invention relates to the use of at least one oxidizing composition (C2), free of phosphoric acid, comprising citric acid or a salt thereof, during the implementation of a process for the oxidation dyeing of keratin fibres, for improving the sheen and the dyeing properties of said keratin fibres, in particular while resulting in more chromatic and uniform colourings. Dyeing process combining at least one oxidizing composition (C2) and at least one dye composition (Cl)

[0098] As indicated above, the invention also relates to a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, for improving the cosmetic and dyeing properties of said keratin fibres, comprising at least the use of at least one oxidizing composition (C2), as defined above, in combination with at least one dye composition (Cl) comprising one or more oxidation dyes.

[0099] For the purposes of the present invention, the term “combination” means that the oxidizing composition (C2) and the dye composition (Cl) may be used on keratin fibres separately, i.e. sequentially, or simultaneously, i.e. at the same time, or may be mixed at the time of use, i.e. be mixed extemporaneously, before applying the ready - to-use oxidation dye composition resulting at least from said mixture to said fibres.

[0100] Preferably, the oxidizing composition (C2) and the dye composition (Cl) are mixed at the time of use before applying the ready-to-use oxidation dye composition resulting at least from said mixing to the keratin fibres.

[0101] Preferably, the dyeing process according to the invention comprises: at least one step of mixing at least the oxidizing composition (C2), as defined previously, and at least one dye composition (Cl) comprising one or more oxidation dyes, for preparing a ready-to-use oxidation dye composition, at least one step of applying at least the ready-to-use oxidation dye composition to said keratin fibres.

[0102] Preferably, in the dyeing process, said oxidizing composition (C2) comprises one or more chemical oxidizing agent(s) as previously defined and one or more carboxylic acids corresponding to the following formula (I) and / or a salt thereof as previously defined.

[0103] Preferably, in the dyeing process said at least one dye composition (Cl) comprising a mixture of one or more oxidation bases and one or more couplers.

[0104] The mixing step is preferably carried out at the time of use, just before the composition resulting from the mixing is applied to the hair.

[0105] The composition resulting from the mixing of at least the oxidizing composition (C2) and at least the dye composition (Cl), i.e. the ready-to-use composition, can be used on dry or wet keratin fibres, and also on all types of fair or dark, natural or dyed, permanent-waved, bleached or relaxed, fibres.

[0106] The composition resulting from the mixing preferentially has a pH ranging from 8 to 12, preferably from 8.5 to 11, and better still from 9 to 10.5. According to a particular embodiment of the process of the invention, the fibres are washed before application of the composition resulting from the mixing of the oxidizing composition (C2) and the dye composition (Cl).

[0107] The application of the composition resulting from extemporaneous mixing of the oxidizing composition (C2) and the dye composition (Cl) to the keratin fibres may be performed via any conventional means, in particular by means of a comb, a fine brush, a coarse brush, with the hand or with the fingers.

[0108] The dyeing process is generally performed at room temperature (between 15°C and 25°C).

[0109] The composition according to the invention, resulting from the extemporaneous mixing, may be applied to the keratin fibres for a leave-on time ranging from 30 to 60 minutes.

[0110] After application of said composition, the keratin fibres may optionally be washed with a shampoo and / or be rinsed with water.

[0111] Preferably, the dyeing process according to the invention comprises: at least one step of mixing at least the oxidizing composition (C2), free of phosphoric acid, comprising citric acid and / or a salt thereof, and at least one dye composition (Cl) comprising one or more oxidation dyes, preferably a mixture of one or more oxidation bases and one or more couplers, for preparing a ready-to- use oxidation dye composition, at least one step of applying at least the ready -to-use oxidation dye composition to said keratin fibres.

[0112] Oxidation dyes

[0113] The dye composition (Cl) according to the invention comprises (i) one or more oxidation dyes.

[0114] The oxidation dyes can be chosen from one or more oxidation bases, optionally in combination with one or more couplers.

[0115] Preferably, the oxidation dye(s) comprise one or more oxidation bases.

[0116] Preferably, the dye composition (Cl) comprises one or more oxidation bases.

[0117] The oxidation bases can be present in the form of salts, of solvates and / or of solvates of salts.

[0118] The addition salts of the oxidation bases present in the composition according to the invention (Cl) are chosen in particular from the addition salts with an acid, such as the hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, methanesulfonates, phosphates and acetates, and the addition salts with a base, such as sodium hydroxide, potassium hydroxide, aqueous ammonia, amines or alkanolamines.

[0119] Moreover, the solvates of the oxidation bases more particularly represent the hydrates of said oxidation bases and / or the combination of said oxidation bases with a linear or branched C1-C4 alcohol, such as methanol, ethanol, isopropanol or n- propanol. Preferably, the solvates are hydrates.

[0120] By way of example, the oxidation bases are chosen from paraphenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, orthoaminophenols, heterocyclic bases and the corresponding addition salts, the solvates and / or the solvates of the salts.

[0121] The para-phenylenediamines which may be mentioned include, for example, 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, N,N-diethyl-para-phenylenediamine, N,N-dipropyl-para- phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis(P-hydroxyethyl)- para-phenylenediamine, 4-N,N-bis(P-hydroxyethyl)amino-2-methylaniline, 4-N,N- bis(P-hydroxyethyl)amino-2-chloroaniline, 2-P-hydroxyethyl-para-phenylenediamine, 2-methoxymethyl-para-phenylenediamine, 2-fluoro-para-phenylenediamine, 2- isopropyl-para-phenylenediamine, N-(P-hydroxypropyl)-para-phenylenediamine, 2-(y- hydroxypropyl)-para-phenylenediamine, 2-hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3-methyl-para-phenylenediamine, N-ethyl-N-(P-hydroxyethyl)-para- phenylenediamine, N-(P,y-dihydroxypropyl)-para-phenylenediamine, N-(4’- aminophenyl)-para-phenylenediamine, N-phenyl-para-phenylenediamine, 2-P- hydroxyethyloxy -para-phenylenediamine, 2-P-acetylaminoethyloxy-para- phenylenediamine, N-(P-methoxyethyl)-para-phenylenediamine, 4- aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2-P-hydroxyethylamino-5- aminotoluene and 3-hydroxy-l-(4'-aminophenyl)pyrrolidine, and the addition salts, the solvates and / or the solvates of salts thereof.

[0122] Preference is given in particular, among the abovementioned para- phenylenediamines, to para-phenylenediamine, para-toluenediamine, 2-isopropyl-para- phenylenediamine, 2-P-hydroxyethyl-para-phenylenediamine, 2-(y-hydroxypropyl)- para-phenylenediamine, 2-methoxymethyl-para-phenylenediamine, 2-P- 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 2-0- acetylaminoethyloxy-para-phenylenediamine, and the corresponding addition salts, the solvates and / or the solvates of salts thereof.

[0123] The bis(phenyl)alkylenediamines which may be mentioned include, for example, N,N’ -bis(P-hydroxyethyl)-N,N’ -bi s(4’ -aminophenyl)- 1 ,3 -di aminopropanol, N,N’-bis(P-hydroxyethyl)-N,N’-bis(4’-aminophenyl)ethylenediamine, N,N’-bis(4- aminophenyl)tetramethylenediamine, N,N’-bis(0-hydroxyethyl)-N,N’-bis(4- aminophenyl)tetramethylenediamine, N,N’-bis(4- methylaminophenyl)tetramethylenediamine, N,N’-bis(ethyl)-N,N’-bis(4’-amino-3’- methylphenyl)ethylenediamine and l,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctane, and the corresponding addition salts, the solvates and the solvates of the salts.

[0124] The para-aminophenols which are mentioned include, for example, paraaminophenol, 4-amino-3 -methylphenol, 4-amino-3 -fluorophenol, 4-amino-3- chlorophenol, 4-amino-3 -hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-

[0125] 2-hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2- aminomethylphenol, 4-amino-2-(P-hydroxyethylaminomethyl)phenol and 4-amino-2- fluorophenol, and the addition salts, the solvates and the solvates of the salts.

[0126] The ortho-aminophenols which may be mentioned include, for example, 2- aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol and 5-acetamido-2- aminophenol, and the corresponding addition salts, the solvates and the solvates of the salts.

[0127] Among the heterocyclic bases that may be mentioned, for example, are pyridine, pyrimidine and pyrazole derivatives.

[0128] The pyridine derivatives which may be mentioned include the compounds for example described in the 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, the solvates and the solvates of the salts.

[0129] Other pyridine oxidation bases that are useful in the present invention are the

[0130] 3-aminopyrazolo[l,5-a]pyridine oxidation bases or the corresponding addition salts described, for example, in patent application FR 2 801 308. Examples which may be mentioned comprise pyrazolo[l,5-a]pyrid-3-ylamine, 2-acetylaminopyrazolo[l,5- a]pyrid-3 -ylamine, 2-(morpholin-4-yl)pyrazolo[ 1 , 5-a]pyrid-3 -ylamine, 3 - aminopyrazolo[l,5-a]pyridine-2-carboxylic acid, 2-methoxypyrazolo[l,5-a]pyrid-3- ylamine, (3 -aminopyrazolo [ 1 , 5 -a]pyrid-7-yl)methanol, 2-(3 -aminopy razolof 1,5- a]pyrid-5-yl)ethanol, 2-(3-aminopyrazolo[l,5-a]pyrid-7-yl)ethanol, (3- aminopyrazolo[l,5-a]pyrid-2-yl)methanol, 3,6-diaminopyrazolo[l,5-a]pyridine, 3,4- diaminopyrazolo[l,5-a]pyridine, pyrazolo[l,5-a]pyridine-3,7-diamine, 7-(morpholin- 4-yl)pyrazolo[l,5-a]pyrid-3-ylamine, pyrazolo[l,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[l,5-a]pyrid-7-yl)(2- hydroxyethyl)amino] ethanol, 3-aminopyrazolo[l,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]pyridine, and the corresponding addition salts, the solvates and the solvates of the salts.

[0131] More particularly, the oxidation bases that are useful in the present invention are chosen from 3-aminopyrazolo[l,5-a]pyridines and preferably substituted on carbon atom 2 with: a) a (di)(Ci-C6)(alkyl)amino group, said alkyl group possibly being substituted with at least one hydroxy, amino or imidazolium group; b) an optionally cationic 5- to 7-membered heterocycloalkyl group containing from 1 to 3 heteroatoms, optionally substituted with one or more (Ci-Ce)alkyl groups, such as a di(Ci-C4)alkylpiperazinium group; or c) a (Ci-Ce)alkoxy group optionally substituted with one or more hydroxyl groups, such as a P-hydroxyalkoxy group, and the corresponding addition salts, the solvates and the solvates of the salts.

[0132] The pyrimidine derivatives which may be mentioned include the compounds described, for example, in the patents DE 2359399, JP 88-169571, JP 05-63124 and EP 0 770 375 or the 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 and 2,5,6- triaminopyrimidine and their addition salts, the solvates and the solvates of the salts, and their tautomeric forms, when a tautomeric equilibrium exists.

[0133] The pyrazole derivatives which may be mentioned include the compounds described in the patents DE 3843892 and DE 4133957 and the patent applications WO 94 / 08969, WO 94 / 08970, FR-A-2 733 749 and DE 195 43 988, such as 4,5-diamino- 1-methylpyrazole, 4,5-diamino-l-(P-hydroxyethyl)pyrazole, 3,4-diaminopyrazole, 4,5-diamino-l-(4’-chlorobenzyl)pyrazole, 4,5-diamino-l,3-dimethylpyrazole, 4,5- diamino-3 -methyl- 1-phenylpyrazole, 4,5-diamino-l-methyl-3-phenylpyrazole, 4- amino-l,3-dimethyl-5-hydrazinopyrazole, l-benzyl-4,5-diamino-3-methylpyrazole,

[0134] 4.5-diamino-3-tert-butyl-l-methylpyrazole, 4,5-diamino-l-tert-butyl-3- methylpyrazole, 4,5-diamino-l-(P-hydroxyethyl)-3-methylpyrazole, 4,5-diamino-l- ethyl-3-methylpyrazole, 4,5-diamino-l-ethyl-3-(4’-methoxyphenyl)pyrazole, 4,5- diamino-l-ethyl-3-hydroxymethylpyrazole, 4,5-diamino-3-hydroxymethyl-l- methylpyrazole, 4,5-diamino-3-hydroxymethyl-l-isopropylpyrazole, 4,5-diamino-3- methyl- 1 -isopropylpyrazole, 4-amino-5-(2’ -aminoethyl)amino- 1 ,3 -dimethylpyrazole,

[0135] 3.4.5-triaminopyrazole, l-methyl-3,4,5-triaminopyrazole, 3,5-diamino-l-methyl-4- methylaminopyrazole and 3,5-diamino-4-(P-hydroxyethyl)amino-l-methylpyrazole, and the corresponding addition salts, the solvates and / or the solvates of the salts. Use may also be made of 4,5-diamino-l-(P-methoxyethyl)pyrazole.

[0136] A 4,5-diaminopyrazole will preferably be used and even more preferentially

[0137] 4.5-diamino-l-(P-hydroxyethyl)pyrazole and / or a corresponding salt, a solvate and / or a solvate of a salt.

[0138] The pyrazole derivatives which may also be mentioned comprise diamino- N,N-dihydropyrazolopyrazolones and in particular those described in the patent application FR-A-2 886 136, such as the following compounds and the corresponding addition salts: 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2- amino-3-ethylamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- isopropylamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- (pyrrolidin-l-yl)-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 4,5-diamino-l,2- dimethyl-l,2-dihydropyrazol-3-one, 4,5-diamino-l,2-diethyl-l,2-dihydropyrazol-3- one, 4,5-diamino-l,2-bis(2-hydroxyethyl)-l,2-dihydropyrazol-3-one, 2-amino-3-(2- hydroxyethyl)amino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2-amino-3- dimethylamino-6,7-dihydro-lH,5H-pyrazolo[l,2-a]pyrazol-l-one, 2,3-diamino- 5,6,7,8-tetrahydro-lH,6H-pyridazino[l,2-a]pyrazol-l-one, 4-amino-l,2-diethyl-5- (pyrrolidin- 1 -yl)- 1 ,2-dihydropyrazol-3 -one, 4-amino-5-(3 -dimethylaminopyrrolidin- 1 -yl)-l ,2-di ethyl- l,2-dihydropyrazol-3 -one and 2,3-diamino-6-hydroxy-6,7-dihydro- lH,5H-pyrazolo[l,2-a]pyrazol-l-one, their salts, their solvates and / or the solvates of their salts.

[0139] 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, a solvate and / or a solvate of a salt. Use will preferably be made, as heterocyclic bases, of 4,5-diamino-l-(P- hydroxyethyl)pyrazole and / or 2,3-diamino-6,7-dihydro-lH,5H-pyrazolo[l,2- a]pyrazol-l-one and / or 2-P-hydroxyethoxy-3-aminopyrazolo[l,5-a]pyridine and / or a corresponding salt, a solvate and / or a solvate of a salt.

[0140] Preferably, the oxidation base(s) are chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols and heterocyclic bases, and the corresponding addition salts, their solvates and / or the solvates of their salts, and their mixtures; more preferentially from 2-methoxymethyl- para-phenylenediamine, 2-P-hydroxyethyl-para-phenylenediamine and 2-y- hydroxypropyl-para-phenylenediamine, and their addition salts, their solvates and / or the solvates of their salts, and their mixtures.

[0141] When the composition (Cl) comprises at least one oxidation base, the oxidation base(s) is (are) preferably present in a total content ranging from 0.001% to 20% by weight, preferably from 0.005% to 15% by weight, more preferentially from 0.01% to 10% by weight, better still from 0.05% to 5%, even better still from 0.1% to 3% by weight, relative to the weight of the composition (Cl).

[0142] According to one preferred embodiment, when the composition (Cl) comprises at least one oxidation base chosen from 2-methoxymethyl-para- phenylenediamine, 2-P-hydroxyethyl-para-phenylenediamine, 2-y-hydroxypropyl- para-phenylenediamine, addition salts thereof, solvates thereof and / or solvates of the salts thereof and mixtures thereof, said base(s) is (are) present in a total content ranging from 0.001% to 20% by weight, preferably from 0.005% to 15% by weight, more preferentially from 0.01% to 10% by weight, better still from 0.05% to 5%, even better still from 0.1% to 3% by weight, relative to the total weight of the composition.

[0143] In one particular embodiment, the composition (Cl) is free of oxidation bases chosen from para-phenylenediamine, para-toluenediamine, the addition salts thereof, solvates thereof and / or solvates of the salts thereof.

[0144] The oxidation dye(s) can also be chosen from one or more couplers, which can be chosen from the couplers conventionally used for the dyeing of keratin fibres.

[0145] Preferably, the composition (Cl) according to the invention comprises one or more couplers.

[0146] Among the couplers that are useful according to the invention, mention may be made in particular of meta-phenylenediamines, meta-aminophenols, metadiphenols, naphthalene-based coupling agents and heterocyclic coupling agents, and also the corresponding addition salts, the solvates and solvates of the salts thereof. Mention may be made, for example, of 6-hydroxybenzomorpholine, hydroxy ethyl-3,4-methylenedi oxyaniline, 2-amino-5-ethylphenol, 1,3- dihydroxybenzene, 1 ,3 -dihydroxy -2-methylbenzene, 4-chloro- 1 ,3 -dihydroxybenzene, 2, 4-diamino-l-(P-hydroxy ethyloxy )benzene, 2-amino-4-(P-hy droxy ethylamino)- 1- methoxybenzene, 1,3 -diaminobenzene, l,3-bis(2,4-diaminophenoxy)propane, 3- ureidoaniline, 3 -ureido-1 -dimethylaminobenzene, sesamol, a-naphthol, 2-methyl-l- naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-3- hydroxypyridine, 3,5-diamino-2,6-dimethoxypyridine, 2,6-bis(P- hy droxy ethylamino)toluene, 6-hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1- H-3-methylpyrazol-5-one, l-phenyl-3-methylpyrazol-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[l,5-a]benzimidazole, 2-methyl-5-aminophenol, 5-N-(P- hy droxy ethyl)amino-2-methylphenol, 3 -aminophenol and 3-amino-2-chloro-6- methylphenol, the corresponding addition salts, the solvates and the solvates of the salts, and the corresponding mixtures.

[0147] Preferably, the coupler(s) is or are chosen from: 6-hydroxybenzomorpholine, its addition salts, its solvates and / or the solvates of its salts, hydroxyethyl-3,4- methylenedioxyaniline, its addition salts, its solvates and / or the solvates of its salts, and 2-amino-5-ethylphenol, its addition salts, its solvates and / or the solvates of its salts, and mixtures thereof.

[0148] In general, the addition salts of the couplers which can be used in the context of the invention are chosen in particular from the addition salts with an acid, such as hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates, and the addition salts with a base, such as sodium hydroxide, potassium hydroxide, aqueous ammonia, amines or alkanolamines.

[0149] Moreover, the solvates more particularly represent the hydrates of these couplers and / or the combination of these couplers with a linear or branched C1-C4 alcohol, such as methanol, ethanol, isopropanol or n-propanol. Preferably, the solvates are hydrates.

[0150] According to a particular embodiment, the composition (Cl) is free of oxidation couplers chosen from resorcinol, 2-methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof and the solvates of the salts thereof.

[0151] When the composition comprises one or more oxidation couplers, the total content of the coupler(s) present in the composition according to the invention varies from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0152] When they are present, the total content of the couplers chosen from 6- hydroxybenzomorpholine, hydroxy ethyl-3,4-methylenedioxyaniline, 2-amino-5- ethylphenol and also the addition salts thereof, the solvates thereof and / or the solvates of the salts thereof preferably ranges from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0153] When they are present, the total content of the couplers chosen from 6- hydroxybenzomorpholine, the addition salts thereof, the solvates thereof and / or the solvates of the salts thereof preferably ranges from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0154] When they are present, the total content of the couplers chosen from hydroxyethyl-3,4-methylenedioxyaniline, the addition salts thereof, the solvates thereof and / or the solvates of the salts thereof preferably ranges from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0155] When they are present, the total content of the couplers chosen from 2-amino- 5-ethylphenol, the addition salts thereof, the solvates thereof and / or the solvates of the salts thereof preferably ranges from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0156] Preferably, the total content of the oxidation dyes ranges from 0.001% to 20% by weight, more preferentially from 0.005% to 15% by weight, better still from 0.01% to 10% by weight, even better still from 0.05% to 5% by weight, and even better still from 0.1% to 3% by weight, relative to the total weight of the composition (Cl).

[0157] The dye composition (Cl) is notably free of chemical oxidizing agent. Fatty acid

[0158] The dye composition (Cl) may also comprise (ii) one or more fatty acids.

[0159] “Fatty acid” is understood to mean a long-chain carboxylic acid comprising at least 6 carbon atoms, in particular from 6 to 40 carbon atoms, preferably from 8 to 30 carbon atoms. The fatty acids according to the invention preferentially comprise from 10 to 30 carbon atoms and better still from 14 to 22 carbon atoms. They can optionally be hydroxylated.

[0160] Preferably, the fatty acids present in the composition according to the invention include at least one carboxylic acid group and a linear or branched, saturated or unsaturated, in particular unsaturated, alkyl chain comprising from 6 to 40 carbon atoms, preferably from 8 to 30 carbon atoms, more preferentially from 10 to 30 carbon atoms and better still from 14 to 22 carbon atoms.

[0161] Preferably, the fatty acids include at least one carboxylic acid group and a linear or branched, saturated or unsaturated, in particular unsaturated, alkyl chain comprising from 10 to 30 carbon atoms, in particular from 14 to 22 carbon atoms.

[0162] Preferably, the fatty acids include at least one carboxylic acid group and a linear or branched, unsaturated alkyl chain comprising from 14 to 22 carbon atoms.

[0163] More preferentially, the fatty acids according to the invention are chosen from compounds having the structure R-C(O)OH in which R represents a linear or branched, saturated or unsaturated alkyl group comprising from 6 to 40 carbon atoms, preferably from 8 to 30 carbon atoms, preferentially from 12 to 24 carbon atoms, better still from 14 to 20 carbon atoms.

[0164] For the purposes of the present invention, the fatty acids present in the composition (Cl) are neither oxyalkylenated nor glycerolated.

[0165] The fatty acids may be chosen from solid fatty acids, liquid fatty acids, and mixtures thereof.

[0166] For the purposes of the present invention, the term “solid fatty acid” means a fatty acid with a melting point above 25°C, preferably above or equal to 28°C, more preferentially above or equal to 30°C at atmospheric pressure (1.013>< 105Pa).

[0167] The solid fatty acids used in the present invention are notably chosen from myristic acid, cetylic acid, arachidic acid, stearic acid, lauric acid, behenic acid, 12- hydroxystearic acid, and mixtures thereof.

[0168] Particularly preferably, the solid fatty acid(s) are chosen from lauric acid, myristic acid, cetylic acid and stearic acid. For the purposes of the present invention, the term “liquid fatty acid” means a fatty acid with a melting point below or equal to 25°C, preferably below or equal to 20°C at atmospheric pressure (1.013* 105Pa).

[0169] The liquid fatty acid(s) according to the invention may be chosen from oleic acid, linoleic acid, linolenic acid, arachidonic acid, isostearic acid, isopalmitic acid, and mixtures thereof, preferentially oleic acid.

[0170] Preferably, the fatty acids present in the composition according to the invention (Cl) are liquid fatty acids, in particular chosen from fatty acids including at least one carboxylic acid group and a linear or branched, unsaturated alkyl chain comprising from 10 to 30 carbon atoms, in particular from 14 to 22 carbon atoms.

[0171] Preferably, the fatty acids present in the composition (Cl) are liquid fatty acids, in particular chosen from oleic acid, linoleic acid, linolenic acid and mixtures thereof, more preferentially oleic acid.

[0172] Preferably, the fatty acids present in the composition (Cl) are myristic acid, lauric acid, oleic acid, linoleic acid, linolenic acid, isocetylic acid, isostearic acid, cetylic acid, stearic acid, and mixtures thereof, preferably oleic acid.

[0173] Preferably, the fatty acid(s) are chosen from myristic acid, cetylic acid, stearic acid, oleic acid, and mixtures thereof, preferentially oleic acid.

[0174] Advantageously, the fatty acid(s) are present in a total content ranging from 0.1% to 15% by weight, preferably from 0.5% to 10% and preferentially from 1% to 5% by weight, relative to the total weight of the composition (Cl).

[0175] In one particular embodiment, advantageously the liquid fatty acid(s) are present in a total content ranging from 0.1% to 15% by weight, preferably from 0.5% to 10%, preferentially from 1% to 5% by weight, relative to the total weight of the composition (Cl).

[0176] Alkaline agent

[0177] The dye composition (Cl) may comprise (iii) one or more alkaline agents.

[0178] The alkaline agent(s) may be mineral, organic or hybrid alkaline agents.

[0179] For the purposes of the present invention, the terms “alkaline agent” or “basifying agent” are used without distinction.

[0180] The mineral basifying agent(s) are preferably chosen from aqueous ammonia, alkali metal carbonates or bicarbonates such as sodium (hydrogen) carbonate and potassium (hydrogen) carbonate, alkali metal or alkaline-earth metal phosphates such as sodium phosphates or potassium phosphates, sodium or potassium hydroxides, alkali metal or alkaline-earth metal silicates or metasilicates such as sodium metasilicate, and mixtures thereof.

[0181] The organic basifying agent(s) are preferably chosen from alkanolamines, amino acids, organic amines other than alkanolamines, oxyethylenated and / or oxypropylenated ethylenediamines, 1,3 -diaminopropane, spermine, spermidine, and mixtures thereof.

[0182] 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.

[0183] Organic amines chosen from alkanolamines such as monoalkanolamines, dialkanolamines or trialkanolamines comprising one to three identical or different Ci to C4 hydroxyalkyl radicals are in particular suitable for performing the invention.

[0184] In particular, the alkanolamine(s) are chosen from monoethanolamine (MEA), diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, N,N-dimethylethanolamine, 2-amino-2-methyl-l -propanol, triisopropanolamine, 2-amino-2-methyl- 1,3 -propanediol, 3-amino-l,2-propanediol, 3- dimethylamino-l,2-propanediol, tri s(hydroxymethyl)aminom ethane and mixtures thereof.

[0185] Advantageously, the amino acids are basic amino acids comprising an additional amine function. Such basic amino acids are preferably chosen from histidine, lysine, arginine, ornithine and citrulline.

[0186] 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 notably be made of carnosine, anserine and balenine. The organic amine may also be chosen from compounds including a guanidine function. As amines of this type other than arginine that may be used in the present invention, mention may notably be made of creatine, creatinine, 1,1 -dimethylguanidine, 1,1 -di ethylguanidine, glycocyamine, metformin, agmatine, n-amidoalanine, 3-guanidinopropionic acid, 4-guanidinobutyric acid and 2-([amino(imino)methyl]amino)ethane-l -sulfonic acid.

[0187] Use may be made in particular of guanidine carbonate or monoethanolamine hydrochloride as hybrid compounds. The alkaline agent(s) that is (are) useful according to the invention is (are) preferably chosen from alkanolamines such as monoethanolamine, diethanolamine or triethanolamine; aqueous ammonia, carbonates or bicarbonates such as sodium (hydrogen) carbonate and potassium (hydrogen) carbonate, alkali metal or alkaline- earth metal silicates or metasilicates such as sodium metasilicate and mixtures thereof, more preferentially from aqueous ammonia and alkanolamines, better still from alkanolamines and even better still monoethanolamine.

[0188] Preferably, the basifying agent(s) is or are organic.

[0189] Preferably, the basifying agents is or are chosen from alkanolamines such as monoethanolamine, diethanolamine and triethanolamine.

[0190] In a particular embodiment, the composition (Cl) according to the invention is free of aqueous ammonia.

[0191] The total content of the alkaline agent(s) is greater than or equal to 5% by weight relative to the total weight of the composition (Cl).

[0192] Preferably, the total content of alkaline agents is greater than or equal to 8% by weight, more preferentially greater than or equal to 10% by weight, relative to the total weight of the composition (Cl).

[0193] Preferably, the total content of alkaline agents ranges from 5% to 40% by weight, more preferentially from 6% to 30% by weight, better still from 8% to 20% by weight, and even better still from 10% to 15% by weight relative to the total weight of the composition (Cl).

[0194] In a preferred embodiment, the total content of the alkaline agent(s) chosen from alkanolamines, preferably monoethanolamine, is preferably greater than or equal to 5% by weight, and preferentially ranges from 6% to 40% by weight, more preferentially from 7% to 30% by weight, more preferentially still from 8% to 20% by weight, and better still from 10% to 15% by weight, relative to the total weight of the composition (Cl).

[0195] According to one embodiment, the pH of the composition (Cl) is between 8 and 13, preferably between 9.0 and 12, and better still between 10 and 11.

[0196] Preferably, the composition (Cl) comprises at least one alkaline agent chosen from alkanolamines and has a pH of between 8 and 13, preferably between 9.0 and 12 and better still between 10 and 11.

[0197] The pH of the composition (Cl) can be adjusted to the desired value by means of acidic or alkaline agent(s) commonly used in the dyeing of keratin fibres, such as those described above, or else using buffer systems known to a person skilled in the art.

[0198] Fatty alcohols

[0199] The dye composition (Cl) according to the invention may comprise one or more fatty alcohols.

[0200] For the purposes of the present invention, the term “fatty alcohol” means a long-chain aliphatic alcohol comprising from 6 to 40 carbon atoms, preferably from 8 to 30 carbon atoms, and comprising at least one hydroxyl group OH.

[0201] For the purposes of the present invention, the fatty alcohols are neither oxyalkylenated nor glycerolated.

[0202] The fatty alcohols according to the invention may be saturated or unsaturated, linear or branched, and include from 8 to 40 carbon atoms.

[0203] More preferentially, the fatty alcohols according to the invention are chosen from compounds having the structure R-OH with R denoting a linear or branched, saturated or unsaturated alkyl group optionally substituted with one or more hydroxyl groups, comprising from 8 to 40, better still from 10 to 30, or even from 12 to 24 and even better still from 14 to 22 carbon atoms.

[0204] The fatty alcohols may be chosen from liquid fatty alcohols and solid fatty alcohols, and mixtures thereof.

[0205] For the purposes of the present invention, the term “solid fatty alcohol” means a fatty alcohol with a melting point of greater than 25°C, preferably greater than or equal to 28°C, more preferentially greater than or equal to 30°C at atmospheric pressure (1.013 * 105Pa).

[0206] The solid fatty alcohols may be chosen from saturated or unsaturated, linear or branched solid fatty alcohols, including from 8 to 40 carbon atoms.

[0207] The solid fatty alcohols that can be used according to the invention are preferably chosen from compounds having the structure R-OH with R denoting a saturated linear alkyl group, optionally substituted with one or more hydroxyl groups, comprising from 8 to 40, better still from 10 to 30, or even from 12 to 24 atoms, even better still from 14 to 22 carbon atoms.

[0208] The solid fatty alcohols that may be used may be chosen, alone or as a mixture, from:

[0209] - lauryl alcohol (or 1 -dodecanol);

[0210] - myristyl alcohol (or 1 -tetradecanol); - cetyl alcohol (or 1 -hexadecanol);

[0211] - stearyl alcohol (or 1 -octadecanol);

[0212] - arachidyl alcohol (or 1-eicosanol);

[0213] - behenyl alcohol (or 1 -docosanol);

[0214] - lignoceryl alcohol (or 1 -tetracosanol);

[0215] - ceryl alcohol (or 1-hexacosanol);

[0216] - montanyl alcohol (or 1-octacosanol);

[0217] - myricyl alcohol (or 1-triacontanol).

[0218] Among the mixtures of solid fatty alcohols, use will preferably be made of cetyl alcohol, stearyl alcohol and / or mixtures thereof such as cetearyl alcohol.

[0219] For the purposes of the present invention, the term “liquid fatty alcohol” means a fatty alcohol with a melting point below or equal to 25°C, preferably below or equal to 20°C at atmospheric pressure (1.013 * 105Pa).

[0220] The liquid fatty alcohols that can be used according to the invention are preferably chosen from compounds having the structure R-OH with R denoting a saturated or unsaturated, linear or branched, preferably unsaturated and / or branched, alkyl group optionally substituted with one or more hydroxyl groups, comprising from 8 to 40, better still from 10 to 30, or even from 12 to 24 and even better still from 14 to 22 carbon atoms.

[0221] Preferably, the liquid fatty alcohols are chosen from compounds having the structure R-OH with R denoting an unsaturated and / or branched, preferably unsaturated, alkyl group optionally substituted with one or more hydroxyl groups, comprising from 12 to 24 and better still from 14 to 22 carbon atoms.

[0222] The liquid fatty alcohols that may be used may be chosen, alone or as a mixture, from oleyl alcohol, linoleyl alcohol, linolenyl alcohol, isocetyl alcohol, isostearyl alcohol, 2-octyl-l -dodecanol, 2-butyloctanol, 2 -hexyl- 1 -decanol, 2-decyl-l- tetradecanol and 2-tetradecyl-l-cetanol, and mixtures thereof; use will preferably be made of oleyl alcohol.

[0223] Preferably, the liquid fatty alcohols are chosen from linoleyl alcohol, oleyl alcohol, linolenyl alcohol and mixtures thereof, preferably oleyl alcohol.

[0224] Preferably, the fatty alcohol(s) are chosen from fatty alcohols comprising 14 to 40 carbon atoms, more preferentially 14 to 22 carbon atoms, better still cetyl alcohol, stearyl alcohol, cetearyl alcohol, oleyl alcohol and mixtures thereof.

[0225] Preferably, the composition (Cl) also comprises one or more fatty alcohols. According to a preferred embodiment, the composition (Cl) according to the invention comprises one or more solid fatty alcohols and one or more liquid fatty alcohols, preferably one or more solid fatty alcohols comprising 14 to 40 carbon atoms, more preferentially 14 to 22 carbon atoms and one or more liquid fatty alcohols comprising 14 to 40 carbon atoms, more preferentially 14 to 22 carbon atoms.

[0226] According to a preferred embodiment, the composition (Cl) according to the invention comprises one or more solid fatty alcohols comprising from 14 to 22 carbon atoms and one or more liquid fatty alcohols comprising from 14 to 22 carbon atoms.

[0227] According to another preferred embodiment, the composition (Cl) according to the invention comprises one or more solid fatty alcohols chosen from compounds having the structure R-OH with R denoting a linear saturated alkyl group, optionally substituted with one or more hydroxy groups, comprising from 14 to 22 carbon atoms, and one or more liquid fatty alcohols chosen from compounds having the structure R- OH with R denoting an unsaturated and / or branched, preferentially unsaturated, alkyl group, optionally substituted with one or more hydroxy groups, comprising from 14 to 22 carbon atoms.

[0228] Advantageously, the fatty alcohol(s) are present in a total content ranging from 1% to 35% by weight, preferably from 5% to 30% by weight, more preferentially from 8% to 25% by weight, and better still from 10% to 20% by weight, relative to the total weight of the composition (Cl).

[0229] According to a particular embodiment, advantageously, the solid fatty alcohol(s) are present in a total content ranging from 1% to 35% by weight, preferably from 5% to 30% by weight, more preferentially from 8% to 25% by weight and better still from 10% to 20% by weight, relative to the total weight of the composition (Cl).

[0230] According to another particular embodiment, the liquid fatty alcohol(s) are advantageously present in a total content ranging from 0.5% to 15% by weight, more preferentially from 1% to 10% by weight and better still from 2% to 5% by weight relative to the total weight of the composition (Cl).

[0231] Polyol

[0232] The composition (Cl) according to the invention may also comprise one or more polyols.

[0233] For the purposes of the present invention, the term “polyol” means an organic compound constituted of a hydrocarbon chain optionally interrupted with one or more oxygen atoms and bearing at least two free hydroxy groups (-OH) borne by different carbon atoms, it being possible for this compound to be cyclic or acyclic, linear or branched, and saturated or unsaturated.

[0234] Preferably, the polyols are different from the fatty alcohols as defined above.

[0235] More particularly, the polyol(s) comprise from 2 to 30 hydroxy groups, more preferentially from 2 to 10 hydroxy groups, even more preferentially from 2 to 3 hydroxy groups.

[0236] The polyol(s) are preferably chosen from diglycerol, glycerol, propylene glycol, propane- 1,3 -diol, 1,3-butylene glycol, pentane- 1,2-diol, octane- 1,2-diol, dipropylene glycol, hexylene glycol, ethylene glycol, polyethylene glycols, sorbitol, sugars, such as glucose, and mixtures thereof, preferably from glycerol, propane-1, 3- diol and mixtures thereof.

[0237] Preferably, the composition comprises one or more polyols chosen from diglycerol, glycerol, propylene glycol, propane-1, 3 -diol, 1,3-butylene glycol, pentane- 1,2-diol, octane- 1,2-diol, dipropylene glycol, hexylene glycol, ethylene glycol, polyethylene glycols, sorbitol, sugars, such as glucose, and mixtures thereof, preferably from glycerol, propane- 1,3 -diol and mixtures thereof.

[0238] Preferably, the composition (Cl) comprises one or more polyols, more preferentially chosen from propane- 1,3 -diol, glycerol and mixtures thereof.

[0239] Even more preferentially, the composition (Cl) comprises propane- 1,3 -diol.

[0240] Advantageously, the polyol(s) are present in a total content of greater than or equal to 5% by weight relative to the total weight of the composition (Cl).

[0241] More advantageously, the polyol(s) are present in a total content ranging from 1% to 20% by weight, preferentially from 3% to 15% by weight relative to the total weight of the composition (Cl).

[0242] Additives

[0243] The composition (Cl) or (C2) may comprise one or more additives other than the compounds of the invention.

[0244] Among which mention may be made of cationic, anionic, nonionic or amphoteric polymers or mixtures thereof, other than those mentioned previously, antidandruff agents, anti-seborrhoeic agents, agents for preventing hair loss and / or for promoting hair regrowth, vitamins and provitamins including panthenol, sunscreens, mineral or organic pigments, plasticizers, solubilizers, opacifiers or nacreous agents, antioxidants, fragrances, and preserving agents. Of course, a person skilled in the art will take care to choose this or these optional additional compounds so that the advantageous properties intrinsically attached to the composition according to the invention are not, or not substantially, detrimentally affected by the envisaged addition(s).

[0245] The above additives may generally be present in an amount, for each of them, of between 0 and 20% by weight relative to the total weight of the ready-to-use composition.

[0246] According to a preferred embodiment, said at least one dye composition (Cl) corresponds to at least one dye composition (CM1) or at least one dye composition (CM’ 1) as defined below.

[0247] According to this preferred embodiment, said at least one dye composition (Cl) corresponds to at least one dye composition (CM1) comprising (i) one or more oxidation dyes, as defined previously, (ii) one or more fatty acids, as defined previously, (iii) one or more alkaline agents, as defined previously, and (iv) one or more nonionic surfactants of alkyl polyglucoside type as defined below.

[0248] Composition (CM) obtained by mixing at least one dye composition (CM1) and at least one oxidizing composition (C2):

[0249] The present invention also relates to a composition (CM) obtained by mixing: at least one dye composition (CM1) comprising:

[0250] (i) one or more oxidation dyes, as defined previously,

[0251] (ii) one or more fatty acids, as defined previously,

[0252] (iii) one or more alkaline agents, as defined previously, and

[0253] (iv) one or more nonionic surfactants of alkyl polyglucoside type, and at least one oxidizing composition (C2), free of phosphoric acid, comprising:

[0254] (v) one or more chemical oxidizing agents, as defined previously, and

[0255] (vi) one or more carboxylic acids other than the fatty acid(s) (ii), as defined previously.

[0256] Nonionic surfactant of alkyl polyglucoside type

[0257] The dye composition (CM1) further comprises (iv) one or more nonionic surfactants of alkyl polyglucoside type. In other words, the dye composition (CM1) also comprises (iv) one or more alkyl polyglucosides.

[0258] The term “alkyl (poly)glycoside” denotes an alkyl polyglycoside or an alkyl monoglycoside, also referred to in the present patent application as an alkyl glycoside, which may be alkoxylated with one or more alkylene oxide groups, preferentially C2- C4 alkylene oxide groups.

[0259] The alkyl (poly)glycoside(s) may be represented by the general formula below: RiO-(R2O)t-(G)vwherein:

[0260] - Ri represents a linear or branched alkyl or alkenyl radical including 6 to 24 carbon atoms and notably 8 to 18 carbon atoms, or an alkylphenyl radical of which the linear or branched alkyl radical includes 6 to 24 carbon atoms and notably 8 to 18 carbon atoms;

[0261] - R2 represents an alkylene radical including 2 to 4 carbon atoms,

[0262] - G represents a sugar unit including 5 to 6 carbon atoms,

[0263] - 1 denotes a value ranging from 0 to 10 and preferably from 0 to 4,

[0264] - v denotes a value ranging from 1 to 15 and preferably from 1 to 4.

[0265] Preferably, the alkyl (poly)glycosides are compounds of the formula described above wherein:

[0266] - Ri denotes a linear or branched, saturated or unsaturated alkyl radical including from 8 to 18 carbon atoms,

[0267] - R2 represents an alkylene radical including 2 to 4 carbon atoms,

[0268] - 1 denotes a value ranging from 0 to 3 and preferably equal to 0,

[0269] - G denotes glucose, fructose or galactose, preferably glucose,

[0270] - the degree of polymerization, i.e. the value of v, possibly ranging from 1 to 15 and preferably from 1 to 4; the mean degree of polymerization more particularly being between 1 and 2.

[0271] The glucoside bonds between the sugar units are generally of 1-6 or 1-4 type and preferably of 1-4 type. Preferably, the alkyl (poly)gly coside is an alkyl (poly)glucoside.

[0272] Among the commercial products, mention may be made of the products sold by COGNIS under the names Plantaren® (600 CS / U, 1200 and 2000) or Plantacare® (818, 1200 and 2000); the products sold by SEPPIC under the names Oramix CG 110 and Oramix® NS 10; the products sold by BASF under the name Lutensol GD 70; the products sold by CHEM Y under the name AGIO LK; the products sold by Evonik Goldschmidt under the trade names Tego Care CG 90 or Tego Care CG 90 MB, the products sold by SEPPIC under the trade names Montanov® 68, Montanov® 68 MB, Montanov® 14 or Montanov® 202, or the products sold by BASF under the name Emulgade® PL 68 / 50.

[0273] Preferentially, the composition comprises one or more alkyl (poly)glycosides chosen from the following, alone or as a mixture: (C6-C24 alkyl) (poly)glycosides, and more particularly (Cs-Cis alkyl) (poly)glycosides, preferably chosen from coco glucoside, lauryl glucoside, caprylyl / capryl glucoside and cetearyl glucoside, better still cetearyl glucoside.

[0274] C8 / Ci8 alkyl (poly)glucosides of 1-4 type, and notably the compounds having the INCI names coco glucoside and cetearyl glucoside, are most particularly preferred.

[0275] The total content of alkyl (poly)glycoside(s) preferably ranges from 0.01% to 20% by weight, preferentially from 0.02% to 10% by weight, more preferentially from 0.05% to 8% by weight, better still from 0.08% to 5% by weight, even better still from 0.1% to 3% by weight, or even from 0.2% to 2% by weight, relative to the total weight of the composition (CM1).

[0276] The dye composition (CM1) may optionally comprise one or more polysaccharides and / or one or more polyols as defined above and / or one or more fatty alcohols as defined above.

[0277] Polysaccharide

[0278] The dye composition (CM1) may also comprise one or more polysaccharides.

[0279] Preferably, the dye composition (CM1) comprises one or more polysaccharides, more preferentially chosen from anionic polysaccharides.

[0280] The term “polysaccharides” means polymers which contain at least 11 monosaccharide units. Preferentially, the polysaccharides of the invention include between 20 and 100 000 monosaccharide units.

[0281] The anionic polysaccharides according to the invention comprise one or more anionic or anionizable groups, and do not comprise any cationic or cationizable groups.

[0282] The anionic polysaccharides that are useful according to the invention may be chosen from those derived from the following sugars: glucose; galactose; arabinose; rhamnose; mannose; xylose; fucose; anhydrogalactose; galacturonic acid; glucuronic acid; mannuronic acid; galactose sulfate; anhydrogalactose sulfate.

[0283] The anionic polysaccharides of the invention may be natural or synthetic. According to a particular embodiment, the anionic polysaccharides that are useful in the composition (CM1) according to the invention are chosen from native gums such as:

[0284] • tree or shrub exudates, for instance: acacia gum (branched polymer of galactose, arabinose, rhamnose and glucuronic acid); ghatti gum (polymer derived from arabinose, galactose, mannose, xylose and glucuronic acid); karaya gum (polymer derived from galacturonic acid, galactose, rhamnose and glucuronic acid); gum tragacanth (polymer of galacturonic acid, galactose, fucose, xylose and arabinose);

[0285] • gums derived from algae, such as: alginates (polymers of mannuronic acid and glucuronic acid); carrageenans and furcellerans (polymers of galactose sulfate and anhydrogalactose sulfate);

[0286] • microbial gums such as: xanthan gums (polymer of glucose, mannose acetate, mannose / pyruvic acid and glucuronic acid); gellan gums (polymer of partially acylated glucose, rhamnose and glucuronic acid).

[0287] For the purposes of the present invention, the term “ microbial gums’" means substances synthesized by fermentation of sugars by microorganisms.

[0288] According to a preferred embodiment, the anionic polysaccharides that are useful in the composition according to the invention are chosen from anionic gums, better still from anionic microbial gums, more preferentially from xanthan gums.

[0289] The total content of polysaccharides preferably ranges from 0.01% to 10% by weight relative to the total weight of the composition, preferably from 0.05% to 8% by weight, better still from 0.1% to 5% by weight, relative to the total weight of the composition (CM1).

[0290] When they are present, the total content of anionic polysaccharides as defined previously preferably ranges from 0.01% to 10% by weight relative to the total weight of the composition, preferably from 0.05% to 8% by weight, better still from 0.1% to 5% by weight relative to the total weight of the composition (CM1).

[0291] The total content of the anionic microbial gums as defined previously ranges, when they are present, preferably from 0.01% to 10% by weight relative to the total weight of the composition, preferably from 0.05% to 5% by weight, better still from 0.1% to 2% by weight relative to the total weight of the composition (CM1).

[0292] According to another preferred embodiment, said at least one dye composition (Cl) corresponds to at least one dye composition (CM’ l) comprising (i) one or more fatty acids, as defined previously, (ii) one or more alkaline agents, as defined previously, and (iii) one or more oxidation dyes, other than resorcinol, 2- methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof and solvates of salts thereof, as defined previously.

[0293] Composition (CM’) obtained by mixing at least one dye composition (CM’ 1) and at least one oxidizing composition (C2)

[0294] Therefore, one subject of the present invention is notably a composition (CM’) obtained by mixing: at least one dye composition (CM’ 1) comprising:

[0295] (i) one or more fatty acids, as defined previously,

[0296] (ii) one or more alkaline agents, as defined previously, and

[0297] (iii) one or more oxidation dyes, other than resorcinol, 2- methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof and solvates of salts thereof, as defined previously, and at least one oxidizing composition (C2), free of phosphoric acid, comprising:

[0298] (iv) one or more chemical oxidizing agents, as defined previously, and

[0299] (v) one or more carboxylic acids other than the fatty acid(s) (i), as defined previously.

[0300] Dyeing process using at least one composition (CM) or (CM’)

[0301] Another subject of the present invention is a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising at least the application to said fibres of at least one composition according to the invention (CM) or (CM’).

[0302] In particular, the invention relates to a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising at least the application to said fibres of at least one composition obtained by mixing at least one composition (CM1) or (CM’ l) and at least one oxidizing composition (C2), as defined above free of phosphoric acid, comprising: (iv) one or more chemical oxidizing agents, as defined previously, and (v) one or more carboxylic acids other than the fatty acid(s) (i), as defined previously.

[0303] In other words, the process according to the invention comprises at least one step of mixing the composition (CM1), as defined above, or the composition (CMT), with at least one oxidizing composition (C2), as defined above, and at least one step of applying the composition resulting from said mixture to said fibres.

[0304] This mixing step is preferably performed at the time of use, just before the composition resulting from the mixing is applied to the hair.

[0305] The pH of the mixture generally ranges from 8 to 12, preferentially from 8.5 to 11, and better still from 9 to 10.5.

[0306] In other words, the composition according to the invention (CM) or (CM’) preferably has a pH ranging from 8 to 12, preferably from 8.5 to 11 and better still from 9 to 10.5.

[0307] The composition according to the invention (CM) or (CM') can be used on dry or wet keratin fibres, and also on all types of fair or dark, natural or dyed, permanent-waved, bleached or relaxed, fibres.

[0308] According to a particular embodiment of the process of the invention, the fibres are washed before application of the composition described above.

[0309] The application of the composition of the invention (CM) or (CM') to the keratin fibres may be performed via any conventional means, in particular by means of a comb, a fine brush, a coarse brush, with the hand or with the fingers.

[0310] The dyeing process, i.e. the application of the dye composition to the keratin fibres, is generally performed at room temperature (between 15°C and 25°C).

[0311] The composition according to the invention (CM) or (CM') may be applied to the keratin fibres for a leave-on time ranging from 30 to 60 minutes.

[0312] After application of the composition according to the invention (CM) or (CM'), the keratin fibres may optionally be washed with a shampoo and / or be rinsed with water.

[0313] Device

[0314] The invention also relates to a multi-compartment device comprising at least a first compartment containing at least the composition (CM1), as defined above, or the composition (CM’ l), as defined above, and at least a second compartment containing at least the composition (C2) as defined above free of phosphoric acid, comprising: (iv) one or more chemical oxidizing agents, as defined previously, and (v) one or more carboxylic acids other than the fatty acid(s) (i), as defined previously.

[0315] According to a preferred embodiment, the multi-compartment device comprises a first compartment containing at least the composition (CM1) as previously defined, and at least a second compartment containing at least the composition (C2) as defined above.

[0316] According to another preferred embodiment, the multi-compartment device comprises a first compartment containing at least the composition (CM’ l) as previously defined, and at least a second compartment containing at least the composition (C2) as defined above.

[0317] The compositions (CM1) or (CM’ 1) and (C2) of the device according to the invention are packaged in separate compartments, optionally accompanied by suitable application means, which may be identical or different, such as fine brushes, coarse brushes or sponges.

[0318] The device mentioned above may also be equipped with a means for dispensing the desired mixture onto the hair, for instance the devices described in patent FR 2586913.

[0319] The examples that follow serve to illustrate the invention, but without being limiting in nature.

[0320] Examples

[0321] Example

[0322] In the examples that follow, all the amounts are given as mass percentages of active material (AM) relative to the total weight of the composition (unless otherwise mentioned).

[0323] Dye compositions

[0324] The compositions A, B and C were prepared from the ingredients, the contents of which are shown in the table below (% am):

[0325] [Table 1]

[0326] Oxidizing composition [Table 2]

[0327] The dye composition A is mixed with the oxidizing compositions (B) and (C) in a ratio of 1 : 1.5.

[0328] Each of the mixtures is applied to locks of moderately sensitized (AS20) hair, in a proportion of 5 g of mixture per 1 g of hair. After a leave-on time of 30 minutes at room temperature, the locks are rinsed with clean water, and lastly the locks are dried for 2 hours in an oven at 60°C.

[0329] Colorimetric measurements were performed using a KONICA MINOLTA CM-3600A spectrocolorimeter (illuminant D65, angle 10°, specular component included) in the CIELab system.

[0330] The chromaticity is calculated according to the following formula:

[0331] The higher the chromaticity value C*, the more chromatic the colour of the fibres.

[0332] The mixture of the dye composition (A) with the oxidizing composition (C) free of phosphoric acid, according to the invention, results in a higher C* value, and therefore a better chromaticity, compared with the mixture of the dye composition (A) with the oxidizing composition (B) comprising phosphoric acid.

[0333] In addition, it is observed that the application of the composition resulting from the mixture of the dye composition (A) and the oxidizing composition (C) results in an improvement in the cosmetic properties of the hair, in particular the sheen thereof.

[0334] Thus, the use of the oxidizing composition according to the invention during an oxidation dyeing process has made it possible to improve the chromaticity of the colour and the cosmetic properties of the hair, in particular the sheen thereof.

[0335] Furthermore, the composition obtained by mixing the compositions (A) and (C) has made it possible to improve the chromaticity of the colour and the cosmetic properties of the hair, in particular the sheen thereof.

Claims

CLAIMS1. Use of at least one oxidizing composition (C2), free of phosphoric acid, comprising one or more chemical oxidizing agents, during a process for the oxidation dyeing of keratin fibres, preferably human keratin fibres such as the hair, for improving the cosmetic and dyeing properties of said fibres.

2. Use according to Claim 1 of said oxidizing composition (C2) in the preparation of at least one ready-to-use oxidation dye composition for improving the cosmetic and dyeing properties of keratin fibres.

3. Use according to Claim 1 or 2, for improving the sheen and dyeing properties of keratin fibres, preferably human keratin fibres such as the hair.

4. Use according to any one of the preceding claims, characterized in that the chemical oxidizing agent(s) is or are chosen from hydrogen peroxide, urea hydrogen peroxide, alkali metal bromates, persalts, such as perborates and persulfates, peracids and oxidase enzymes (with their optional cofactors), and mixtures thereof; preferably, the chemical oxidizing agent(s) are chosen from hydrogen peroxide, persalts, and mixtures thereof; more preferentially the chemical oxidizing agent is hydrogen peroxide.

5. Use according to any one of the preceding claims, characterized in that the oxidizing composition (C2) further comprises one or more carboxylic acids corresponding to the following formula (I) and / or a salt thereof:in which:- U represents a saturated or unsaturated, cyclic or non-cyclic, aromatic or nonaromatic, monovalent, when n has the value 0, or polyvalent, when n is greater than or equal to 1, hydrocarbon group comprising from 1 to 8 carbon atoms which is optionally interrupted by one or more heteroatoms and / or optionally substituted, in particular by one or more hydroxy groups; preferably, U represents a monovalent (Ci-Ce)alkyl group or a polyvalent (Ci-Ce)alkylene group optionally substituted by one or more hydroxy and / or amino groups;n represents an integer of between 0 and 10 inclusive; preferably, n is of between 0 and 5, such as between 0 and 2; preferably, the carboxylic acid is chosen from glycolic acid, citric acid, lactic acid, tartaric acid or a salt thereof, preferably glycolic acid or lactic acid or a salt thereof, better still lactic acid, citric acid and / or a salt thereof.

6. Process for dyeing keratin fibres, in particular human keratin fibres such as the hair, in order to improve the cosmetic and dyeing properties of said fibres, comprising at least the use of at least one oxidizing composition (C2), comprising one or more chemical oxidizing agents, as defined in any one of Claims 1, 4 or 5, in combination with at least one dye composition (Cl) comprising one or more oxidation dyes.

7. Process according to the preceding claim, for improving the sheen of keratin fibres, preferably human keratin fibres such as the hair.

8. Process according to Claim 6 or 7, characterized in that it comprises: at least one step of mixing at least the oxidizing composition (C2), as defined according to any one of Claims 1, 4 or 5, and at least one dye composition (Cl) comprising one or more oxidation dyes, for preparing a ready -to-use oxidation dye composition, at least one step of applying at least said ready-to-use oxidation dye composition to said keratin fibres.

9. Process according to any of Claims 6 to 8, characterized in that the oxidation dyes are chosen from oxidation bases, couplers, and their mixtures thereof.

10. Composition according to Claim 9, characterized in that the oxidation base(s) is or are chosen from para-phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho-aminophenols, heterocyclic bases, and the corresponding addition salts, the solvates thereof and / or the solvates of the salts thereof, and mixtures thereof; more preferentially from 2-methoxymethyl-para-phenylenediamine, 2-P- hydroxyethyl-para-phenylenediamine, 2-y-hydroxypropyl-para-phenylenediamine, and the addition salts thereof, the solvates thereof and / or the solvates of the salts thereof, and mixtures thereof.

11. Process according to any one of Claims 6 to 10, characterized in that the dye composition (Cl) further comprises one or more fatty acids, preferably comprising at least one carboxylic acid and a linear or branched, saturated or unsaturated, in particular unsaturated, alkyl chain comprising from 10 to 30 carbon atoms, in particular from 14 to 22 carbon atoms.

12. Process according to Claim 11, characterized in that the fatty acids are liquid fatty acids, in particular chosen from the group consisting of oleic acid, linoleic acid, linolenic acid, arachidonic acid, isostearic acid, isopalmitic acid and mixtures thereof, more preferentially oleic acid.

13. Process according to any one of Claims 6 to 12, characterized in that the dye composition (Cl) further comprises one or more alkaline agents, preferably chosen from alkanolamines such as monoethanolamine, diethanolamine or triethanolamine; aqueous ammonia, carbonates or bicarbonates such as sodium (hydrogen) carbonate and potassium (hydrogen) carbonate, alkali metal or alkaline-earth metal silicates or metasilicates such as sodium metasilicate and mixtures thereof; more preferentially from aqueous ammonia and alkanolamines, better still from alkanolamines, and even better still the alkaline agent is monoethanolamine.

14. Composition (CM) obtained by mixing:- at least one dye composition (CM1) comprising (i) one or more oxidation dyes, (ii) one or more fatty acids, (iii) one or more alkaline agents, and (iv) one or more nonionic surfactants of alkyl polyglucoside type, and- at least one oxidizing composition (C2) free of phosphoric acid and comprising (v) one or more chemical oxidizing agents and (vi) one or more carboxylic acids other than the fatty acid(s) (ii), preferably one or more carboxylic acids corresponding to formula (I) as defined according to Claim 5.

15. Composition (CM’) obtained by mixing:- at least one dye composition (CM’ 1) comprising (i) one or more fatty acids, (ii) one or more alkaline agents, and (iii) one or more oxidation dyes other than resorcinol, 2-methylresorcinol, 4-chlororesorcinol, addition salts thereof, solvates thereof or solvates of salts thereof;- at least one oxidizing composition (C2) free of phosphoric acid and comprising (iv) one or more chemical oxidizing agents and (v) one or more carboxylic acids other than the fatty acid(s) (i), preferably one or more carboxylic acids corresponding to formula (I) as defined according to Claim 5.

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