OXIDATION DYEING COMPOSITION FOR KERATINOUS FIBERS CONTAINING A PARAPHENYLENEDIAMINE DERIVATIVE AND DYEING METHOD USING SAME

Abstract

The subject-matter of the invention is a composition for the oxidation dyeing of keratinous fibres, in particular of human keratinous fibres, such as hair, comprising at least one para-phenylenediamine derivative as oxidation base, in combination with at least one coupler of meta-aminophenol or meta-diphenol type, and the dyeing process employing this composition.

Description

[0001] The subject-matter of the invention is a composition for the oxidation dyeing of keratinous fibres, in particular of human keratinous fibres, such as hair, comprising at least one suitably selected para-phenylenediamine derivative as oxidation base, in combination with at least one suitably selected coupler of meta-aminophenol or meta-diphenol type, and the dyeing process employing this composition.

[0002] It is known to dye keratinous fibres and in particular human hair with dyeing compositions comprising oxidation dye precursors, in particular ortho- or para-phenylenediamines or ortho- or para-aminophenols, generally known as oxidation bases. Oxidation dye precursors or oxidation bases are colourless or weakly coloured compounds which, in combination with oxidizing substances, can give rise by an oxidative coupling process to coloured and colouring compounds.

[0003] It is also known that the shades obtained with these oxidation bases can be varied by combining them with couplers or colouring modifiers, the latter being chosen in particular from aromatic meta-diamines, meta-aminophenols or meta-diphenols.

[0004] The variety of the molecules employed as oxidation bases and couplers makes it possible to obtain a rich palette of colours.

[0005] The so-called “permanent” colouring obtained by virtue of these oxidation dyes has, however, to satisfy a certain number of requirements. Thus, it must be without disadvantage toxicologically and it must make it possible to obtain shades with the desired intensity and behave well in the face of external agents (light, bad weather, washing, permanent waving, perspiration or rubbing).

[0006] Provision has already been made, in particular in French Patent Application FR-A-2 364 888, for compositions for the oxidation dyeing of keratinous fibres comprising, as oxidation base, para-phenylenediamines substituted in the 2 position, such as, for example, 2-(&bgr;-mesylaminoethyloxy)-para-phenylenediamine, optionally in combination with one or more couplers of meta-aminophenol, such as, for example, 5-amino-2-methylphenol, meta-phenylenediamine or meta-diphenol type, in order to obtain, in oxidizing alkaline medium, colourings with blue shades which are more or less purple, these being very luminous. The colourings obtained with these compositions are not, however, entirely satisfactory, in particular as regards the behaviour of these colourings with respect to various attacks which hair may be subjected to and in particular with respect to perspiration and permanent waving.

[0007] The present invention is targeted at providing novel compositions for the oxidation dyeing of keratinous fibres and in particular of human keratinous fibres, such as hair, which exhibit very good dyeing properties.

[0008] Thus, the Applicant Company has now just discovered that it is possible to obtain novel dyes which are particularly resistant and which generate intense colourings by combining:

[0009] at least one para-phenylenediamine derivative of formula (I) defined below and/or one of its addition salts with an acid,

[0010] at least coupler of formula (I) defined below and/or one of its addition salts with an acid.

[0011] This discovery is at the basis of the present invention.

[0012] The first subject-matter of the invention is therefore a composition for the oxidation dyeing of keratinous fibres and in particular of human keratinous fibres, such as hair, characterized in that it comprises, in a medium appropriate for dyeing:

[0013] at least one oxidation base chosen from para-phenylenediamine derivatives of following formula (I) and their addition salts with an acid: 1

[0014]  in which:

[0015] R1 represents a hydrogen atom or a mesyl, carbamoyl or acetyl radical,

[0016] n is an integer between 1 and 4 inclusive;

[0017] at least one coupler chosen from compounds of following formula (II) and their addition salts with an acid: 2

[0018]  in which:

[0019] R2 represents a hydroxyl radical or an NHR4 group where R4 denotes a hydrogen atom or a C1-C4 alkyl, C1-C4 monohydroxyalkyl or C2-C4 polyhydroxyalkyl radical,

[0020] R3 represents a hydrogen atom, a C1-C4 alkyl or C1-C4 alkoxy radical or a halogen atom chosen from chlorine, bromine and fluorine;

[0021] it being understood that, when n=2, when R1 represents a mesyl radical, when R3 represents a methyl radical in the 6 position and when R2 represents an NHR4 group, then R4 is other than a hydrogen atom.

[0022] The colourings obtained with the above compositions exhibit a good dyeing power and excellent properties of resistance both with respect to atmospheric agents, such as light and bad weather, and with respect to perspiration and various treatments which hair can be subjected to (shampoos, permanent deformations).

[0023] Another subject-matter of the invention is a process for the oxidation dyeing of keratinous fibres employing this composition.

[0024] The addition salts with an acid which can be used in the context of the dyeing compositions of the invention can in particular be chosen from hydrochlorides, hydrobromides, sulphates and tartrates.

[0025] Mention may more particularly be made, among the para-phenylenediamine derivatives of above formula (I), of 2-(&bgr;-mesylaminoethyloxy)-para-phenylenediamine, 2-(&bgr;-ureidoethyloxy)-para-phenylenediamine, 2-(&bgr;-acetylaminoethyloxy)-para-phenylenediamine, 2-(&bgr;-aminoethyloxy)-para-phenylenediamine and their addition salts with an acid.

[0026] Mention may more particularly be made, among the couplers of above formula (II), of meta-aminophenol, 5-amino-2-methoxyphenol, 5-amino-2-(&bgr;-hydroxyethyloxy)phenol, 5-amino-2-methylphenol, 5-N-(&bgr;-hydroxyethyl)amino-2-methylphenol, 5-N-(&ggr;-hydroxypropyl)amino-2-methylphenol, 1,3-dihydroxybenzene, 2-methyl-1,3-dihydroxybenzene, 4-chloro-1,3-dihydroxybenzene and their addition salts with an acid.

[0027] The para-phenylenediamine derivative or derivatives of formula (I) in accordance with the invention and/or its or their addition salts with an acid preferably represent from 0.0005 to 10% by weight approximately of the total weight of the dyeing composition and more preferably still from 0.05 to 7% by weight approximately.

[0028] The coupler or couplers of formula (II) in accordance with the invention and/or its or their addition salts with an acid preferably represent from 0.0001 to 5% by weight approximately of the total weight of the dyeing composition and more preferably still from 0.005 to 3% by weight approximately.

[0029] The medium appropriate for dyeing (or vehicle) is generally composed of water or of a mixture of water and of at least one organic solvent, in order to dissolve the compounds which would not be sufficiently soluble in water. Mention may be made, for example, as organic solvent, of lower C1-C4 alkanols, such as ethanol and isopropanol; glycerol; glycols and glycol ethers, such as 2-butoxyethanol, propylene glycol, diethylene glycol monoethyl ether and diethylene glycol monomethyl ether, and aromatic alcohols, such as benzyl alcohol or phenoxyethanol, the analogous products and their mixtures.

[0030] The solvents can be present in proportions preferably of between 1 and 40% by weight approximately with respect to the total weight of the dyeing composition and more preferably still between 5 and 30% by weight approximately.

[0031] The pH of the dyeing composition as defined above is generally between 5 and 12 approximately. It can be adjusted to the desired value by means of acidifying or basifying agents commonly used in dyeing keratinous fibres.

[0032] Mention may be made, among acidifying agents, by way of examples, of inorganic or organic acids, such as hydrochloric acid, orthophosphoric acid, carboxylic acids, such as tartaric acid, citric acid or lactic acid, or sulphonic acids.

[0033] Mention may be made, among basifying agents, by way of examples, of aqueous ammonia, alkaline carbonates, alkanolamines, such as mono-, di- and triethanolamines, and their derivatives, sodium hydroxide, potassium hydroxide and the compounds of following formula (III): 3

[0034] in which R is a propylene residue optionally substituted by a hydroxyl group or a C1-C4 alkyl radical; and R5, R6, R7 and R8, which are identical or different, represent a hydrogen atom or a C1-C4 alkyl or C1-C4 hydroxyalkyl radical.

[0035] The dyeing composition in accordance with the invention can also comprise, in addition to the dyes defined above, other oxidation bases other than the para-phenylenediamine derivatives of formula (I) in accordance with the invention and/or other couplers other than the couplers of formula (II) in accordance with the invention and/or direct dyes, in particular for modifying the shades or enriching them with highlights.

[0036] The dyeing composition according to the invention can also include various adjuvants conventionally used in hair dyeing compositions, such as anionic, cationic, non-ionic or amphoteric surface-active agents or their mixtures, anionic, cationic, non-ionic or amphoteric polymers or their mixtures, inorganic or organic thickening agents, antioxidizing agents, penetration agents, sequestering agents, fragrances, buffers, dispersing agents, conditioning agents, such as, for example, silicones, film-forming agents, preserving agents or opacifying agents.

[0037] Of course, a person skilled in the art will take care to choose the optional additional compound or compounds mentioned above so that the advantageous properties intrinsically attached to the dyeing composition according to the invention are not, or not substantially, detrimentally affected by the envisaged addition or additions.

[0038] The dyeing composition according to the invention can be provided in various forms, such as in the form of liquids, creams or gels, or in any other form appropriate for carrying out dyeing of keratinous fibres and in particular of human hair.

[0039] Another subject-matter of the invention is a process for dyeing keratinous fibres and in particular human keratinous fibres, such as hair, employing the dyeing composition as defined above.

[0040] According to this process, the dyeing composition as defined above is applied to the fibres to be coloured, the colour being developed at acidic, neutral or alkaline pH using an oxidizing agent which is added only at the time of use to the dyeing composition or which is present in an oxidizing composition applied simultaneously or sequentially in a separate fashion.

[0041] According to a preferred embodiment of the invention, the pH resulting from the mixing of the dyeing composition and of the oxidizing composition is between 5 and 12 approximately.

[0042] According to a particularly preferred embodiment of the dyeing process according to the invention, the dyeing composition described above is mixed, at the time of use, with an oxidizing composition comprising, in a medium appropriate for dyeing, at least one oxidizing agent present in an amount sufficient to develop a colouring. The mixture obtained is subsequently applied to the keratinous fibres and is left to stand for 3 to 40 minutes approximately, preferably 5 to 30 minutes approximately, after which the hair is rinsed, washed with a shampoo, rinsed again and dried.

[0043] The oxidizing agent present in the oxidizing composition as defined above can be chosen from oxidizing agents conventionally used for the oxidation dyeing of keratinous fibres and among which may be mentioned hydrogen peroxide, urea hydrogen peroxide, alkali metal bromates, or persalts, such as perborates and persulphates. Hydrogen peroxide is particularly preferred.

[0044] The pH of the oxidizing composition including the oxidizing agent as defined above is such that, after mixing with the dyeing composition, the pH of the resulting composition applied to keratinous fibres preferably varies between 2 and 12 approximately and more preferably still between 5 and 11. It is adjusted to the desired value by means of acidifying or basifying agents commonly used in dyeing keratinous fibres and as defined above.

[0045] The oxidizing composition as defined above can also include various adjuvants conventionally used in hair dyeing compositions and as defined above.

[0046] The composition which is finally applied to keratinous fibres can be provided in various forms, such as in the form of liquids, creams or gels, or in any other form appropriate for carrying out dyeing of keratinous fibres and in particular of human hair.

[0047] Another subject-matter of the invention is a dyeing multi-compartment device or kit or any other packaging system with several compartments, a first compartment of which includes the dyeing composition as defined above and a second compartment of which includes the oxidizing composition as defined above. These devices can be equipped with a means allowing the desired mixture to be deposited on the hair, such as the devices disclosed in Patent FR-A-2,586,913 on behalf of the Applicant Company.

[0048] The examples which follow are intended to illustrate the invention without, for all that, limiting the scope thereof.

EXAMPLES

Comparative Examples 1 to 4

[0049] The following dyeing compositions were prepared (contents in grams): 1 EXAMPLE 1 2 (*) 3 4 (*) 2-(&bgr;-Acetylamino- 0.845 0.845 ethyloxy)- para-phenylenediamine dihydrochloride (oxidation base in accordance with the invention) 2-(&bgr;-Aminoethyloxy)- 0.83 0.83 para-phenylenediamine trihydrochloride (oxidation base in accordance with the invention) 5-N-(&bgr;-Hydroxyethyl)a- 0.54 0.54 mino-2-methoxyphenol (coupler in accordance with the invention) 2-Methoxy-5- 0.63 (carbethoxyamino)phenol (coupler not forming part of the invention) 5-Acetylamino-2- 0.54 methoxyphenol (coupler not forming part of the invention) Common dyeing (**) (**) (**) (**) vehicle (**) Water, q.s. for 100 g 100 g 100 g 100 g (*): example not forming part of the invention (**): Common dyeing vehicle:

[0050] 2 96° Ethanol 18.0 g Pentasodium salt of 1.08 g diethylenetriaminepentaacetic acid Sodium metabisulphite as an aqueous 0.58 g solution comprising 35% of A.M. Aqueous ammonia comprising 20% of NH3 10.0 g

[0051] It is important to note that each dyeing composition comprises the same molar amount of coupler and the same molar amount of oxidation base, namely 3×10−3 mol.

[0052] At the time of use, each dyeing composition was mixed with an equal amount of an oxidizing composition consisting of a 20-volume aqueous hydrogen peroxide solution (6% by weight) exhibiting a pH of approximately 3.

[0053] Each mixture obtained was applied for 30 minutes to two batches of locks of natural grey hair comprising 90% of white hairs (Batch A and Batch B). The locks of hair were subsequently rinsed, washed with a standard shampoo and then dried.

[0054] The colour of the locks (Batch A and Batch B) was subsequently evaluated in the Munsell system by means of a CM 2002 Minolta calorimeter (ASTM Standard D 1535-68).

[0055] According to the Munsell notation, a colour is defined by the expression H V/C, in which the three parameters respectively denote the tint or Hue (H), the intensity or Value (V) and the purity or Chromaticity (C), the oblique stroke in this expression being simply a convention and not indicating a ratio.

Resistance to Permanent Waving

[0056] The dyed locks of hair from Batch A were subjected to a test of resistance to permanent waving.

[0057] To do this, the locks of hair from Batch A were immersed for 10 minutes in a reducing solution in a ratio of 2 g of the following reducing solution per lock weighing 1 g: 3 Thioglycolic acid 6.7 g Diammonium dithioglycolate at 46% in water 5.0 g Basifying agent, q.s. pH = 7.9 Demineralized water, q.s. for 100.0 g

[0058] After rinsing, the locks of hair from Batch A were immersed for 5 minutes in an oxidizing solution (consisting of an 8-volume hydrogen peroxide solution with a pH of 3) in the ratio of 2 g of oxidizing solution per lock weighing 1 g.

[0059] The locks were subsequently rinsed with water and then dried for 1 hour at 60° C.,

[0060] The colour of the locks of hair from Batch A was subsequently evaluated again in the Munsell system by means of a CM 2002 Minolta calorimeter.

[0061] The difference between the colour of the lock before the permanent waving and the colour of the lock after the permanent waving was calculated by applying the Nickerson formula:

&Dgr;E=0.4Co&Dgr;H+6&Dgr;V+3&Dgr;C

[0062] as described, for example, in “Couleur, Industrie et Technique” [Colour, Industry and Technology], pages 14-17, Vol. No. 5, 1978.

[0063] In this formula, &Dgr;E represents the difference in colour between two locks, &Dgr;H, &Dgr;V and &Dgr;C represent the variation in absolute value of the parameters H, V and C, and Co represents the purity of the lock with respect to which it is desired to evaluate the difference in colour.

[0064] The deterioration in colour (&Dgr;E) increases as the figure shown increases.

[0065] The results are given in Table I below: 4 Colour of the Colour of the EX- hair before hair after the Deterioration in the AM- the permanent permanent colour PLE waving waving &Dgr;H &Dgr;V &Dgr;C &Dgr;E 1 9.7 YR 3.8/1.1 0.2 Y 4.5/1.5 0.5 0.7 0.4 5.6 2 (*) 9.6 PB 2.9/2.1 8.6 P 4.0/0.6 9.0 1.1 1.5 18.7 3 1.2 Y 2.7/0.6 9.9 YR 3.2/1.0 1.3 0.5 0.4 4.5 4 (*) 6.3 PB 2.6/0.9 6.4 YR 3.5/0.7 40.1 0.9 0.2 20.4 (*): Example not forming part of the invention.

[0066] These results show that the compositions 1 and 3 in accordance with the invention, that is to say comprising the combination of a para-phenylenediamine derivative of formula (I) and of a coupler of formula (II), result in colourings which withstand permanent waving much better than the colourings obtained with the compositions 2 and 4, which do not form part of the invention because they contain the combination of a para-phenylenediamine derivative of formula (I) in accordance with the invention and of a coupler not corresponding to the formula (II) of the invention. These compositions 2 and 4 of the prior art are disclosed, for example, in Patent Application FR-A-2,364,888.

Resistance to Perspiration

[0067] The dyed locks of hair from Batch B were subjected to a test of resistance to perspiration.

[0068] To do this, the locks of hair from Batch B were immersed in a crystallizing dish, covered with a watch-glass, containing a synthetic sweat solution with the following composition: 5 NaCl 1 g Potassium hydrogenphosphate 0.1 g Histidine 0.025 g Lactic acid q.s. pH 3.2 Distilled water, q.s. for 100 g

[0069] The locks of dyed hair from Batch B were left standing in this synthetic sweat solution for 48 hours at 37° C. The locks were subsequently rinsed and then dried.

[0070] The colour of the locks from Batch B was subsequently evaluated again in the Munsell system by means of a CM 2002 Minolta calorimeter, so as to determine the deterioration in the colourings after this test of resistance to perspiration.

[0071] The difference in colour between two locks (in this instance, before and after the treatment simulating perspiration) was calculated by applying the Nickerson formula as described above.

[0072] The results are given in Table II below: 6 EX- Colour of the Colour of the Deterioration in the AM- hair before hair after the colour PLE perspiration perspiration &Dgr;H &Dgr;V &Dgr;C &Dgr;E 1 9.7 YR 3.8/1.1 1.3 Y 4.6/0.9 1.6 0.8 0.2 6.1 2 (*) 9.6 PB 2.9/2.1 6.0 P 3.9/1.1 6.4 1.0 1.0 14.4 3 1.2 Y 2.7/0.6 8.2 YR 3.8/0.8 3.0 1.1 0.2 7.9 4 (*) 6.3 PB 2.6/0.9 2.8 YR 3.8/0.7 36.5 1.2 0.3 21.2 (*): Example not forming part of the invention.

[0073] These results show that the compositions 1 and 3 in accordance with the invention, that is to say comprising the combination of a para-phenylenediamine derivative of formula (I) and of a coupler of formula (II), result in colourings which withstand perspiration much better than the colourings obtained with the compositions 2 and 4, which do not form part of the invention because they contain the combination of a para-phenylenediamine derivative of formula (I) in accordance with the invention and of a coupler not corresponding to the formula (II) of the invention. These compositions 2 and 4 of the prior art are disclosed, for example, in Patent Application FR-A-2,364,888.

Dyeing Examples 5 to 12

[0074] The following dyeing compositions in accordance with the invention were prepared (contents in grams): 7 EXAMPLE 5 6 7 8 9 10 11 12 2-(&bgr;-Acetylaminoethyloxy)- 0.417 0.417 0.417 0.417 — — — — para-phenylenediamine dihydrochloride (Oxidation base) 2-(&bgr;-Aminoethyloxy)-para- — — — — 0.415 0.415 0.415 0.415 phenylenediamine trihydrochloride (Oxidation base) Resorcinol (Coupler) 0.33 — — — 0.33 — — — H meta-Aminophenol (Coupler) — 0.327 — — — 0.327 — — 5-N-(&bgr;-Hydroxyethyl) amino-2- — — 0.50 — — — 0.50 — methylphenol (Coupler) 2, 4-Diaminophenoxyethanol — — — 0.722 — — — 0.722 dihydrochloride (Coupler) Common dyeing vehicle (***) (***) (***) (***) (***) (***) (***) (***) (***) Water, q.s. for 100 g 100 g 100 g 100 g 100 g 100 g 100 g 100 g (***) Common dyeing vehicle:

[0075] 8 Oleyl alcohol polyglycerolated with 4.0 g 2 mol of glycerol Oleyl alcohol polyglycerolated with 5.69 g A.M. 4 mol of glycerol comprising 78% of active material (A.M.) Oleic acid 3.0 g Oleylamine with 2 mol of ethylene 7.0 g oxide, sold under the tradename Ethomeen O12 by the company Akzo Diethylaminopropyl 3.0 g A.M. laurylaminosuccinamate, sodium salt, comprising 55% of A.M. Oleyl alcohol 5.0 g Oleic acid diethanolamide 12.0 g Propylene glycol 3.5 g Ethyl alcohol 7.0 g Dipropylene glycol 0.5 g Propylene glycol monomethyl ether 9.0 g Sodium metabisulphite as an aqueous 0.455 g A.M. solution comprising 35% of A.M. Ammonium acetate 0.8 g Antioxidizing agent, sequestering q.s. agent Fragrance, preserving q.s. Aqueous ammonia comprising 20% of 10.0 g NH3

[0076] At the time of use, each dye composition was mixed with an equal amount of an oxidizing composition consisting of a 20-volume aqueous hydrogen peroxide solution (6% by weight) exhibiting a pH of approximately 3.

[0077] Each mixture obtained exhibited a pH of approximately 10.2 and was applied for 30 minutes to locks of natural or permed grey hair comprising 90% of white hairs. The locks of hair were subsequently rinsed, washed with a standard shampoo and then dried.

[0078] The locks of hair were dyed in the shades which appear in the table below: 9 SHADE OF NATURAL EXAMPLE HAIR SHADE ON PERMED HAIR  5 Ash beige Slightly iridescent natural golden  6 Ash deep-purple Ash deep-purple  7 Slightly iridescent ash Ash deep-purple deep-purple  8 Green grey blue Blue  9 Matt natural grey Matt natural grey 10 Matt natural grey Matt natural grey 11 Slightly purplish ashen Purplish ashen 12 Grey blue Grey blue

Claims

1. Composition for the oxidation dyeing of keratinous fibres and in particular of human keratinous fibres, such as hair, characterized in that it comprises, in a medium appropriate for dyeing:

at least one oxidation base chosen from para-phenylenediamine derivatives of following formula (I) and their addition salts with an acid:

4

 in which:

R1 represents a hydrogen atom or a mesyl, carbamoyl or acetyl radical,

n is an integer between 1 and 4 inclusive;

at least one coupler chosen from compounds of following formula (II) and their addition salts with an acid:

5

 in which:

R2 represents a hydroxyl radical or an NHR4 group where R4 denotes a hydrogen atom or a C1-C4 alkyl, C1-C4 monohydroxyalkyl or C2-C4 polyhydroxyalkyl radical,

R3 represents a hydrogen atom, a C1-C4 alkyl or C1-C4 alkoxy radical or a halogen atom chosen from chlorine, bromine and fluorine;

it being understood that, when n=2, when R1 represents a mesyl radical, when R3 represents a methyl radical in the 6 position and when R2 represents an NHR4 group, then R4 is other than a hydrogen atom.

2. Composition according to claim 1, characterized in that the para-phenylenediamine derivatives of formula (I) are chosen from 2-(&bgr;-mesylaminoethyloxy)-para-phenylenediamine, 2-(&bgr;-ureidoethyloxy)-para-phenylenediamine, 2-(&bgr;-acetylaminoethyloxy)-para-phenylenediamine and 2-(&bgr;-aminoethyloxy)-para-phenylenediamine, and their addition salts with an acid.

3. Composition according to claim 1 or 2, characterized in that the couplers of formula (II) are chosen from meta-aminophenol, 5-amino-2-methoxyphenol, 5-amino-2-(&bgr;-hydroxyethyloxy)phenol, 5-amino-2-methylphenol, 5-N-(&bgr;-hydroxyethyl)amino-2-methylphenol, 5-N-(&ggr;-hydroxypropyl)amino-2-methylphenol, 1,3-dihydroxybenzene, 2-methyl-1,3-dihydroxybenzene, 4-chloro-1,3-dihydroxybenzene and their addition salts with an acid.

4. Composition according to any one of the preceding claims, characterized in that the addition salts with an acid are chosen from hydrochlorides, hydrobromides, sulphates and tartrates.

5. Composition according to any one of the preceding claims, characterized in that the para-phenylenediamine derivative or derivatives of formula (I) and/or its or their addition salts with an acid represent from 0.0005 to 10% by weight of the total weight of the dyeing composition.

6. Composition according to claim 5, characterized in that the para-phenylenediamine derivative or derivatives of formula (I) and/or its or their addition salts with an acid represent from 0.05 to 7% by weight of the total weight of the dyeing composition.

7. Composition according to any one of the preceding claims, characterized in that the coupler or couplers of formula (II) and/or its or their addition salts with an acid represent from 0.0001 to 5% by weight of the total weight of the dyeing composition.

8. Composition according to claim 7, characterized in that the coupler or couplers of formula (II) and/or its or their addition salts with an acid represent from 0.005 to 3% by weight of the total weight of the dyeing composition.

9. Composition according to any one of the preceding claims, characterized in that the said medium appropriate for dyeing is composed of water or of a mixture of water and of at least one organic solvent chosen from lower C1-C4 alkanols, glycerol, glycols and glycol ethers, aromatic alcohols, the analogous products and their mixtures.

10. Composition according to any one of the preceding claims, characterized in that it exhibits a pH of between 5 and 12.

11. Composition according to any one of the preceding claims, characterized in that it additionally comprises other oxidation bases other than the para-phenylenediamine derivatives of formula (I) and their addition salts with an acid and/or other couplers other than the couplers of formula (II) and their addition salts with an acid and/or direct dyes.

12. Process for dyeing keratinous fibres and in particular human keratinous fibres, such as hair, characterized in that a dyeing composition as defined in any one of claims 1 to 11 is applied to these fibres and in that the colour is developed at acidic, neutral or alkaline pH using an oxidizing agent which is added only at the time of use to the dyeing composition or which is present in an oxidizing composition applied simultaneously or sequentially in a separate fashion.

13. Process according to claim 12, characterized in that the oxidizing agent present in the oxidizing composition is chosen from hydrogen peroxide, urea hydrogen peroxide, alkali metal bromates, or persalts, such as perborates and persulphates.

14. Dyeing multi-compartment device or kit with several compartments, a first compartment of which includes a dyeing composition as defined in any one of claims 1 to 11 and a second compartment of which includes an oxidizing composition comprising an oxidizing agent.