Patent ID: 7527654

Claim:
Process for dyeing keratin fibres, consisting in bringing said fibres into contact with a dye composition comprising, in a suitable dyeing medium, at least one compound of formula (I), and the addition salts thereof: in which: A is a substituted or unsubstituted, 5- to 16-membered, fused or non-fused aromatic or heteroaromatic nucleus; X represents an oxygen atom, a sulphur atom or a group CR 1 R 2 ; R 1 and R 2 represent, independently of each other, a hydrogen atom, a C 1 -C 6 alkyl radical, a C 1 -C 6 hydroxyalkyl radical, a C 1 -C 6 alkoxyalkyl radical or an alkylene chain that may contain an oxygen or sulphur atom; R 1 and R 2 may together form an aromatic or non-aromatic 5- or 6-membered ring optionally containing one or more heteroatoms such as a nitrogen, oxygen or sulphur atom; R 3 represents a hydrogen atom, a halogen atom, a C 1 -C 6 alkyl radical, a cyano radical, an aromatic group, a phenoxy group or a nitro radical; W represents a group CR 4 or a nitrogen atom; R 4 represents a hydrogen atom, a halogen atom, a C 1 -C 6 alkyl radical, a cyano radical, an aromatic group, a phenoxy radical or a nitro radical; Y represents an oxygen atom, a sulphur atom or a group NR 5 ; R 5 represents a hydrogen atom or a C 1 -C 6 alkyl radical; Z represents a group —C p H 2p —, with p being an integer between 2 and 4, which may be unsubstituted or substituted with one or more substituents chosen from halo, hydroxyl, alkyl, haloalkyl, alkoxy, amino, mono- or dialkylamino, mono- or dihydroxyalkylamino and carboxyl radicals; a group —C q H 2q CO—, with q being an integer between 1 and 3, which may be unsubstituted or substituted with one or more substituents chosen from halo, hydroxyl, alkyl, haloalkyl, alkoxy, amino, mono- or dialkylamino, mono- or dihydroxyalkylamino and carboxyl radicals; n represents an integer from 1 to 4; B represents a substituted or unsubstituted, 5- to 16-membered, fused or non-fused aromatic or heteroaromatic nucleus, and b) at least one compound of formula (II) R 6 (R 7 CR 8 ) n —COOX, or a precursor of such a compound, in which formula: R 6 represents a fused or non-fused, 5- to 16-membered nucleus of aromatic or heteroaromatic type comprising at least one nitrogen, oxygen or sulphur atom, optionally substituted with one or more hydroxyl, C 1 -C 3 alkoxy, hydroxycarbonyl, alkoxycarbonyl with the alkoxy group being C 1 -C 3 , amino or cyano groups; n is an integer ranging from 0 to 6; R 7 and R 8 represent, independently of each other, a hydrogen atom, a linear or branched, substituted or unsubstituted C 1 -C 6 alkyl group, a hydroxyl group, a C 1 -C 6 methoxy group, a cyano group, an amino group or a hydroxycarbonyl or alkoxycarbonyl group; X represents a hydrogen atom, a monovalent cation.