MXPA00001642A - DYEING COMPOSITION CONTAINING A PYRAZOLO-[1,5-a]-PYRIMIDINE AS OXIDATION BASE AND A PYRIDINE COUPLING AGENT, AND DYEING METHOD - Google Patents

Abstract

The invention concerns an oxidation dyeing composition for keratinous fibres containing at least a pyrazolo-[1,5-a]-pyrimidine as oxidation base and at least a pyridine coupling agent and the oxidation dyeing method using said composition.

Description

COMPOSITION OF DYE CONTAINING A PIRAZOLO- [1, 5-a] -PIRIMIDINE, AS AN OXIDATION BASE AND A PIRIDINE COUPLER, AND STAINING PROCEDURES Description of the invention: The invention aims at a composition for dyeing, by of the oxidation, of the keratin fibers, wherein the composition contains at least one I or - [1, 5-a] -pyrimidine pyrazole, as the base oxidation, and at least one pyridine coupler; as well as a dyeing process, by means of oxidation, which uses this composition. Methods are known for dyeing keratin fibers and, in particular, human hair, with dyeing compositions containing oxidation dye precursors and, in particular, ortho- or para-phenylenediamines, ortho- or para-aminophenols, from the bis-f eni I to the I-endiamines also, from the heterocyclic compounds, generally called oxidation bases. The oxidation dye precursors, or oxidation bases, are colorless, or slightly colored, compounds that, when combined with oxidizing products, can give rise, through oxidative condensation processes, to colored compounds and dyes, REF .: 32750 Tam It is well known that the nuances obtained with these bases of oxidation can be varied by their association with couplers or modifiers of the coloration, where the latter s choose mainly between the aromatic meta-amines, the meta-aminophen I is, the meta-diphenone I is certain compounds heterocyclic The variety of molecules that can be used at the level of oxidation bases and couplers allows a rich range of colors to be obtained. The coloration called "permanent", which is obtained thanks to the oxidation dyes, must, on the other hand, satisfy a certain number of demands. Thus, there should be no drawbacks in the toxicological field; it must allow to obtain matice with the desired intensity and it must present good protection against the external agents (light, weather, washing, permanent waving, perspiration, rubbing). The dyes must also make it possible to cover the white hairs, and, lastly, to be as selective as possible, that is to say, to obtain the faintest possible color differences over the entire length of the same keratin fiber, which may, in fact, sensitize in a deferred (i .e., spoiled) manner between its tip and its root. It has already been proposed, in particular in the application FR-A-2 750 048, to use the p i r a z or I o - [1, 5-a] pyrimidines, as oxidation bases, alone or in association with one or more couplers. However, the colors obtained are not always strong enough, chromatic or resistant to the different aggressions that the hair can suffer. Now, the Applicant has discovered, quite unexpectedly and surprisingly, that the association of pyrazo I or - [1, 5 - a] - pyrimidines, of the formula (I), which are defined below, and less a pyridine coupler, of the formula (II), which is described below, allows to obtain strong colorations which also present; better resistance properties against the various aggressions that the hair can suffer (shampoo, light, weathering, permanent waving, perspiration, friction, etc.). These discoveries are the basis of the present invention. The invention then has, as a first objective, a composition for oxidation staining of keratin fibers, and in particular, of human keratin fibers, such as hair, where the composition is characterized by containing, in an appropriate medium for staining (dye): - at least one oxidation base chosen from pyrazolo- [l, 5-a] -pyrimidines, of the following formula (I), and their addition salts with an acid or a base : in which: - Rx, R2, R3 and R4 designate, in an identical or different manner, a hydrogen atom, an alkyl radical of C i -C 4, a radical on a ryl, a hydroxyalkyl radical of C 1 -C 4, a polyhydroxyalkyl radical of C 2 -C 4, an alkoxy radical (C 1 -C 4) C 1 -C 4 alkyl, a C 1 -C 4 aminoalkyl radical (the amine may be protected by an acetyl, a ureide, a sulfonyl), an alkyl radical (C 1 -C 4) aminoalkyl of C1-C4, a radical di- [a I qui I (C 1 - C 4)] amino C 1 -C 4 alkyl (the dialkyls can form an aliphatic or heterocyclic ring with 5 or 6 links), a hydroxyl radical I qui I (C 1 -C 4) - or di- [hydroxy I qui I (C 1 -C 4)] - amino C 1 -C 4 alkyl; - the radicals X, identical or different, denote a hydrogen atom, an alkyl radical of C? -C4, an aryl radical, a hydroxyalkyl radical of C i -C 4, a polyhydroxyalkyl radical of C2-C4, an amino alkyl radical of C i -C 4, a C 1 -C 4 alkyl-amino-C 1 -C 4 alkyl radical, a di- [a l-C 1 -C 4)] amino-C 1 -C 4 alkyl radical (the dialkyls can form an aliphatic or heterocyclic ring with 5 or 6 links), a hydroxy radical at I qui (C x -C 4) or di- [hydroxy (C 1 -C 4) alkyl] amino C 1 -C 4 alkyl, a radical amino, a radical to I qui I (C 1 -C 4) - or di- [(C 1 -C 4) alkyl] -amino; a halogen atom, a carboxylic acid group, a sulfonic acid group; - i has the value 0, 1, 2 or 3; - p has the value 0 or 1; - q has the value 0 or 1; - n has the value 0 or 1; provided that: (i) the sum of p + q is different from 0; (ii) when p + q equals 2, then n is 0 and the groups NR? R2 and NR3R4 occupy positions (2,3); (5,6); (6,7); (3.5) or (3.7); (iii) when p + q equals 1, then n is 1 and the group N R i R 2 (or NR3R4) and the group OH occupy the positions (2,3); (5,6); (6,7); (3.5) or (3.7); - and at least one coupler chosen from the pyridines of the following formula (II), and their addition salts with an acid: wherein: - R 5 represents a hydrogen atom, a hydroxyl radical, amino, C 1 -C 4 alkoxy, mono- or di-alkyl (C 1 -C 4) amino, monohydroxyalkyl (C 4 -C 4) amino, polyhydroxyalkyl (C2-C4) amino, monohydroxyalkyl (C1-C4), monohydroxy I coxy (C2-C4), C6-4 alkoxy, or monohydroxyalkoxy (C6-4) C 1 -C alkoxy 4; - R6 represents a hydrogen atom, a hydroxyl radical, amine or C 1 -C 4 alkyl; R7 represents a hydrogen atom, or a C 1 -C 4 alkyl radical; R8 represents an hydrogen or halogen atom such as chlorine, bromine, iodine or fluorine, or an amino radical; - R9 represents a hydrogen atom, a hydroxyl radical, amino, C4-C4 alkoxy, monohydric and C4-C4 alkoxy, or C2-C polyhydroxyalkoxy; wherein at least one of the radicals R5 to R9 are different from a hydrogen atom; and the composition is free of any enzymatic system capable of causing the oxidation of the compounds of the formula (I) and / or (II). As indicated above, the composition of the dye, according to the invention, leads to strong colorations having excellent resistance properties against the action of the different external agents (light, weather, washing, permanent waving, perspiration, friction). The invention also aims at a process for oxidation staining of keratin fibers, where this dye composition is applied. The pyrazolo- [1, 5-a] -pyrimidines of the formula (I) which can be used as oxidation base in the dye composition according to the invention are known compounds and are described in the application FR-A-2 750 048, the content of which forms an integral part of the present application. Among the pyrazoles I or - [1, 5 - a] - pyrimidines, of the formula (I), which can be used as oxidation base in the dyeing compositions according to the invention, mention may be made in particular of: pyrazolo- [1, 5-a] -pyrimidine-3,7-diamine; 2-methyl pyrazolo- [1, 5-a] -pyrimidine-3,7-diamine; 2,5-dimethylpyrazolo- [1, 5-a] -pyrimidin-3,7-d i a m a n; pyrazolo- [1, 5-a] -pyrimidine-3,5-diamine; - the 2,7-dimethyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 5 - d i a m i n a; - 3-am ino p i r a z o 1 o - [1, 5 - a] - p i r i m i d i n - 7 - or I; - 3-am ino 5-methyl pyrazolo- [1, 5-a] -pyrim idin-7-ol; - the 3-amino p i r a z or I o - [1, 5 - a] - p i f i m i d i n - 5 - or I; - the 2- (3-amino p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 7 - i a m i n o) - e t a n o I; - the 3 - a m i n o - 7 - ß - h i d r o x i e t i i a m i n o - 5 - m e t i I - p i r a z o I o - [l, 5-a] -pyrimine; 2- (7-amino pyrazolo- [1, 5-a] -pyrimidin-3-ylamino) -ethanol; - 2 - [(3 - a m i n o - p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 7 - i I) - (2-hydroxyethyl) -amino] -ethanol; - 2 - [(7-m i n o-p i r a zo I o - [1, 5 -a] - p i r i m i d i n - 3 - i I) - (2-hydroxyethyl) -amino] -ethanol; - 5,6-dimethyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 7 - d i a m a n a; - 2,6-dimethyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 7 - d i a m a n a; - 2, 5, N - 7, N - 7 - 1 e t r a m e t i i i i i i i - [1, 5 - a] - p i r i m i d i n - 3,7-diam ina; and their addition salts with an acid or a base. Among the pyridines of the formula (II) which can be used as couplers in the dyeing compositions according to the invention, mention may be made in particular of: 2,6-hydroxy-3,4-dimethyl pyridine; -chloro 2,3-dihydroxy pyridine, 3,5-diamino-2,6-dimethoxy pyridine, 3-amino 2- (β-hydroxyethyl) amino 6-methoxy pyridine, - 2,6-bis (β-hydroxyethyloxy) 3,5-diamino pyridine, 3-amino-5-hydroxy-2,6-dimethoxy pyridine, - 3-amino-2-methylamino-6-methoxy pyridine, -amino 3-hydroxy pyridine, 2-dimethylamine 5-amino pyridine, 2,6-diamino pyridine, - 3,5-diamino 2- (β, β-d ihydroxy) propyloxy pyridine, - la 3, 5-diamino 2 - (? - hydroxypropyloxyethyloxy) pyridine, and its addition salts with an acid. In general, the addition salts with an acid, which can be used within the framework of the invention (oxidation bases and couplers), are chosen especially among the hydrochlorides, the bromohydrates, the sulfates, the citrates, the succinates, the tartrates , lactates and acetates. Addition salts with a base, which can be used in the context of the dyeing compositions of the invention, are especially those obtained with soda, potash, ammonia or mines. The pyrazolo- [1, 5-a] -pyrim idine (s), of the formula (I), according to the invention, and / or the one or more addition salts thereof with an acid or with a base, they preferably represent from 0.0005 to 12%, by weight, approximately, of the total weight of the dye composition and, even more preferably, from 0.005 to 6%, by weight, approximately, of this weight. The pyridine (s) of the formula (II), according to the invention, and / or the addition salt (s) thereof with an acid, preferably represent 0.0001 to 10%, by weight , approximately, of the total weight of the composition of the dye and, even more preferably, of 0.005 to 5%, by weight, of this weight. The suitable medium for dyeing (or support) is generally constituted by water or by a mixture of water and at least one organic solvent, to solubilize the com positions that are not sufficiently soluble in water. As the organic solvent, for example, C?-C 4 alkanols, such as ethanol and isopropanol, may be mentioned; glycerol; glycols and ethers of glycols, such as 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether, monoethyl ether and diethylene glycol monomethyl ether, as well as aromatic alcohols such as benzyl alcohol or phenoxyethanol; analogs and their mixtures. The solvents may be present in proportions com pounded, preferably, between 1 and 40%, by weight, approximately, with respect to the total weight of the dye composition and, even more preferably, between 5 and 30%, by weight, approximately . The pH of the dye composition, according to the invention, is generally between about 3 and 12, and preferably between about 5 and about 11. It can be adjusted to the desired value by acidification or alkalinity agents, which are usually used for the staining of keratin fibers. Examples of acidic agents include mineral or organic acids, such as hydrochloric acid, orthophosphoric acid, sulfuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid, lactic acid. , sulfonic acids. Alkalinity agents include, for example, ammonia; alkaline carbonates; alkanolamines, such as mono-, di- and triethanolamines, 2-methyl-2-amino-propanol, and their derivatives; the sodium or potassium hydroxides and the compounds of the following formula (III): R 10 12 VN-W-N / (III) / \ ^ 11 R13 wherein W is a residue of propylene, optionally substituted by a hydroxyl group or an alkyl radical of C i -C 6; Rio, p, 12 and Rn, identical or different, represent a hydrogen atom, a C 1 -C 6 alkyl radical, or d-C 6 hydroxyalkyl.

The composition of the dye, according to the invention, can also comprise at least one direct dye, especially to modify the shades or enrich them in reflections. The composition of the dye, according to the invention, can also comprise various adjuvants conventionally used in hair dyeing compositions, such as anionic, cationic, nonionic, amphoteric, zwitterionic surfactants or mixtures thereof, polymers anionic, cationic, nonionic, amphoteric, zwitterionic or their mixtures, mineral or organic thickeners, such as, for example, non-ionic guar gums, antioxidants, penetration agents, sequestering agents, perfumes, buffers, dispersing agents conditioning agents, such as, for example, volatile or non-volatile silicones, modified or unmodified, film forming agents, ceramides, preservatives, opacifiers. As is understood, the person skilled in the art will take care to choose the optional complementary compounds, in such a way that the advantageous properties intrinsically linked to the composition of the oxidation dye, according to the invention, are not, at least not substance, altered by the programmed addition (s). The composition of the dye, according to the invention, can be presented in various forms, such as in the form of liquids, powders, creams, gels or in any other suitable form for dyeing the keratin fibers, and especially the hair. humans. Another object of the invention is a method of oxidation staining of keratin fibers and, in particular, of human keratin fibers, such as hair, which uses the composition of the dye, as defined above.

According to this method, at least one composition of the dye is applied to the fibers, as defined above; the coloration is revealed at acid, neutral or alkaline pH with the aid of an oxidizing, non-enzymatic agent, which is added just at the time of use of the dye composition or which is present in an oxidizing composition that is applied at the same time or sequentially.

According to a preferred embodiment of the dyeing process of the invention, the composition of the dye described above is mixed, preferably at the time of use, with an oxidizing composition containing, in a medium suitable for dyeing, at least one non-enzymatic oxidizing agent present in an amount sufficient to develop a coloration. The mixture obtained is then applied onto the keratin fibers and left for about 3 to 50 minutes, preferably, about 5 to 30 minutes, after which it is rinsed, washed with water, rinsed again and dry The oxidizing agent present in the oxidizing composition, as defined above, may be chosen from the oxidizing agents conventionally used for oxidation staining of keratin fibers, and among which may be mentioned hydrogen peroxide, urea peroxide , alkali metal bromates, peracids and persalts such as perborates and persulfates. Hydrogen peroxide is the particularly preferred.

The pH of the oxidizing composition comprising the oxidizing agent, as defined above, is such that, after mixing with the composition of the dye, the pH of the resulting composition applied to the keratin fibers varies preferably. between 3 and 12, approximately, still more preferably, between 5 and 11. It is adjusted to the desired value by means of the acidifying agents to I c n a n d i n a ls commonly used for the staining of keratin fibers and as defined above. The oxidized composition, as defined above, may also comprise various adjuvants conventionally used in hair dyeing compositions, and as defined above. The composition that is finally applied on the keratin fibers can be presented in various forms, such as liquids, creams, gels, or on any other suitable form for dyeing the keratin fibers and especially the human hair. Another object of the invention is a device with several companions or dyeing "equipment", any other conditioning system having different compartments, where a prime compartment contains the composition of the tint (dye), as defined above, and a second compartment contains the oxidizing composition, as defined above. These devices can be equipped with a device that allows distributing the desired mixture on the hair, such as the devices described in patent FR-586 913, to the name of the applicant. The following examples are intended to illustrate the invention, without being of a limiting character.

EXAMPLES EXAMPLES 1 to 3, DYEING IN ALKALINE EDGE The following d staining compositions have been prepared, according to the invention (quantity e grams): (*) Support for common dye no. 1: - Ethyl alcohol of 96 ° 18 - Sodium metabisulphite in 35% aqueous solution 0.68 g Diethylenetriaminepentaacetic acid pentasodium salt 1.1 g 20% NH3 ammonia 10.0 g At the time of use, each of the staining compositions described above is mixed with a solution of hydrogen peroxide up to 20 volumes (6% by weight), co pH 3. The mixture obtained is applied to the Mechone of natural gray hair, with 90% white, for 30 minutes. The strands are immediately rinsed, washed with a standard shampoo, rinsed again, then dried. The nuances obtained are shown in the following table: EXAMPLE pH of the dye Tint obtained 1 10 ± 0.2 Red ashy iridescent 2 10 ± 0.2 Red violet purple 3 10 ± 0.2 Red purple violet EXAMPLES 4 to 6, DYEING IN NEUTRAL MEDIUM The following dyeing compositions were prepared, according to the invention (content in grams): (*) Support for common dye no. 2: - Ethanol 96 ° 18 g - Shock absorber K2HP04 / KH2P04 (1.5 M / l M) 10 g - Sodium metabisulfite 0.68 G - Pentasodic salt of diethylenetriaminepentaacetic acid 1.1 G At the time of use, each of the dyeing compositions described above is mixed, weight by weight, with a solution of hydrogen peroxide up to 20 volumes (6% by weight), with pH 3.

The mixture obtained is applied to the natural gray-haired mechone, with 90% white for 30 minutes. The strands are immediately rinsed, washed with a standard shampoo, rinsed again, then dried. The nuances obtained are shown in the following table: EXAMPLE pH of the dye Tint obtained 4 5.7 ± 0.2 Iridescent ashy red 5 5.7 ± 0.2 Iridescent 6 5.7 ± 0.2 Red purple violet It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (11)

REVIVING DICTIONS Having described the invention as above, the content of the following claims is claimed as property. 1. A composition for oxidation staining of keratin fibers and, in particular, of human keratin fibers, such as hair, characterized in that it contains, in a medium suitable for the dye: - at least one base oxidation chosen from the pyrazolo- [1, 5-a] -pyrim idines, of the following formula (I), and their addition salts with an acid or a base: wherein: Ri, R2, R3 and R4 designate, in differently identical manner, a hydrogen atom, a C1-C4 alkyl radical, an aryl radical, a C1-C4 hydroxyalkyl radical, a polyhydroxyalkyl radical of C2- C 1 is radical (C 1 -C 4) alkoxy C 1 -C 4 alkyl, an aminoalkyl radical of C 4 -C 4 (the amine may be protected by an acetyl, a ureide, a sulfonyl), an alkaline radical (C 2); -C4) C 1 -C 4 alkyl amino, a di [C 1 -C 4) alkyl radical, or C 1 -C 4 alkyl (the dialkyl can form an aliphatic or heterocyclic ring with or 6 links), a hydro radical xia I qui I (C i -C 4) - or di [hydroxy (C 1 -C 4) alkyl] -amino C 1 -C 4 alkyl; - the radicals X, identical or different, designates a hydrogen atom, an alkyl radical of C? -C4 an aryl radical, a hydroxyalkyl radical of C i-C 4 a polyhydroxyalkyl radical of C2-C4, a radical amino alkyl of C1 -C 4, a (C 1 -C 4) alkyl radical to C 1 -C 4 -alkyl, a di- [(C 1 -C 4) amino-C 1 -C 4 alkyl radical (the dialkyls can form an aliphatic or heterocyclic ring with 5 or links), a hydroxy radical to I qui (C 1 -C 4) or di- [hydroxy (C 1 -C 4) alkyl] amino C 1 -C 4 alkyl, or amino radical, an alkyl radical (C C4) - odi [alkyl (C? -C4)] - amino, a halogen atom, or carboxylic acid group, an acid sulphonic group; - i has the value 0, 1, 2 or 3; has the value oo 1; - q has the value 0 or 1; - n has the value 0 or 1, provided that: (i) the sum of p + q is different from 0; (ii) 'when p + q equals 2, then n is valid and the groups R? R2 and NR3R4 occupy the positions (2,3); (5,6); (6,7); (3, 5) or (3,7); (iii) when p + q is equal to 1, then n is valid and the group NR? R2 (or NR3R4) and the group OH occupy the positions (2,3); (5,6); (6,7); (3.5) or (3.7); - and at least one coupler chosen from among the pyridines, of the following formula (II), and their addition salts with an acid: wherein: - R5 represents a hydrogen atom, a hydroxyl, amino, alkoxy of C i -C 4, mono- or di (C?-C4) amino, monohydroxyalkyl (C?-C4) amino polyhydroxyalkyl (C2-C4) amine, monohydroxyalkoxyl d C i -C 4 / C 2 -C 4 polyhydroxyalkoxy, d-C 4 alkoxy monohydroxy I coxy (C i -C 4) to I co xi I o of C -C -C 4; - R6 represents a hydrogen atom, a hydroxyl, amino or C? -C4 alkyl radical; R7 represents an hydrogen atom, or an alkyl radical of C i -C 4;
1. R8 represents a hydrogen atom or d halogen such as chlorine, bromine, iodine or fluorine or an amino radical; - R9 represents a hydrogen atom, a hydroxyl radical, amino, C C-C4 monohydroxyalkoxyl alkoxy of d-C4, or polyhydroxyalkoxy d C 2 -C 4; wherein at least one of the radicals R5 to R9 is different from a hydrogen atom; and the position is free of any enzymatic system capable of causing the oxidation of the compounds of the formula (I) and / or (II).
2. 2. The composition, according to claim 1, characterized in that the pyrazolo [l, 5-a] -pyrimidines, of the formula (I), is chosen from: pyrazolo- [1, 5-a] -pyrimidin- 3,7-diamine; - the 2-methyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 7 - d i a m a n a; - 2,5-dimethylpyrazolo- [1, 5-a] -pyrim idin-3,7 d i a m a n a; - pyrazoyl- [1, 5-a] -pyrimidine-3,5-diamine; - the 2,7-dimethyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 5 d a m a n a; - 3-amino pyrazolo- [1, 5-a] -pyrimidin-7-ol; - 3-amino 5-methyl p i r a zo I o - [1, 5 - a] - p i r i m i d i n - 7 - or I; - the 3-amino p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 5 - or I; - the 2- (3-am ino p i r a z o I o - [1, 5 - a] - p i r i m i d i n - 7 - i a m i n o) ethanol; - 3-amino-7-β-hydroxyethylamino-5-methyl-pyrazolo [1, 5-a] -pyrim idine; - the 2- (7-am ino p i r a z o I o - [1, 5 - a] - p i r i m i d i n - 3 - i a m i n o) ethanol; - 2 - [(3 - a m i n o - p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 7 - i I) - (2-hydroxyethyl) -amino] -ethanol; - 2 - [(7-amino-pyrazolo- [1, 5-a] -pyrimidin-3-yl) - (2-hydroxyethyl) -amne] -ethanol; - 5,6-dimethyl p i r a z or I o - [1, 5 - a] - p i r i m i d i n - 3, 7 d a m a n a; - 2,6-dimethylpyrazolo- [1, 5-a] -pyrim idin-3,7 d a a m i n a; 2,5, N-7, N-7-tetramethyl pyrazolo- [l, 5-a] -pyrim idin 3,7-diamine; and their addition salts with an acid or a base.
3. 3. The composition, according to any of claims 1 or 2, characterized in that the pyridines, of the formula (II), are chosen from: 2,6-hydroxy-3,4-dimeti-pyridine, - 5-chloro-2 , 3-dihydroxy pyridine, 3,5-diamino-2,6-dimethoxy pyridine, - 3-amino 2- (β-hydroxyethyl) amino 6-methoxy pyridine, - 2,6-bis (β-hydroxyethyloxy) 3,5-diamino pyridine, - 3-amino-5-hydroxy-2,6-dimethoxy-pyridine, - 3-amino-2-methylamino-6-methoxy pyridine, - 2-amino-3-hydroxy-pyridine, - 2-dimethylamino-5- amino pyridine, - 2,6-diamino pyridine, - 3,5-diamino 2- (β, β-dihydroxy) propyloxy pyridine, - the 3,5-diamino 2 - (? - h i d r or x i p r or p i I x i e t i I or x i) pyridine, and its addition salts with an acid.
4. 4. The composition according to any of claims 1 to 3, characterized in that the addition salts with an acid are chosen from the hydrochlorides, the bromohydrates, the sulfates, the citrates, the succinates, the tartrates, the lactates, the acetates; and because the addition salts with a base are chosen from those obtained with l soda, potash, ammonia or amines.
5. 5. The composition, according to any of the preceding claims, characterized in that, or the, pyrazolo- [1, 5-a] -pyrim idines, of the formula (I), and / or, or, the salt (s) is ) of addition with an acid with a base, represent from 0.0005 to 12%, by weight of the total weight of the composition of the dye.
6. 6. The composition, according to claim 5, characterized in that the, or the pyrazoo- [1, 5-a] -pyrimidine (s), of the formula (I) and / or, or, the salt (s) of addition with an acid or a base, they represent from 0.005 to 6%, by weight, of the total weight of the dye composition.
7. 7. The composition, according to any of the preceding claims, characterized in that the pyridine (s) of the formula (II) and / or the additive salt (s) with an acid represent 0.0001 to 10%, by weight, of the total weight of the dye composition.
8. 8. The composition, according to claim 7, characterized in that the, or the, pyridine (s) of the formula (II), and / or the, or their, salt (is addition with an acid, represent 0.005 to 5%, by weight, of the total weight of the dye composition.
9. 9. A process for oxidation staining of keratin fibers, and in particular human keratin fibers, such as hair, characterized in that at least one composition of the dye is applied to the fibers, as defined in any of the claims 1 to 8, and because the color reveals an acid, neutral or alkaline pH, with the help of an oxidizing, non-enzymatic agent, which is added just at the time of using the dye composition, or which is present. and an oxidizing composition that is applied to my time or sequentially.
10. 10. The process according to claim 9, characterized in that the oxidizing agent is chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, perishes and persalts.
11. 11. A device with various compartments, dyeing "equipment", having several compartments, characterized in that a first compartment contains a composition of the dye, as defined in any of claims 1 to 8; and because a second composition contains an oxidizing composition containing a non-enzymatic oxidizing agent. SUMMARY OF THE INVENTION The invention concerns a composition for the staining of keratin fibers, wherein the composition contains at least one pyrazolo- [1, 5-a] -pyrimidine, as oxidation base, and at least one pyridine coupling agent; as well as the oxidation staining process where this composition is used.