Patent ID: 6884267

Claim:
A composition for dyeing keratinous fibers, comprising at least one cationic azo dye of formula (I): W 1 —N═N —W 2 —W 3 (I) wherein W 1 is chosen from 5-membered cationic aromatic heterocycles of formula (II) W 2 is chosen from divalent carbonaceous aromatic and pyridine groups of formulae (IV) and (V): W 3 is chosen from 5- and 6-membered nitrogen-comprising heteroaromatic radicals connected to W 2 by the nitrogen atom of the ring of the heteroaromatic radical, wherein the heteroaromatic radical is chosen from pyrazolyl, pyrrolyl, imidazolyl, triazolyl, thiadiazolyl, pyridazinyl and pyrazinyl radicals, wherein each of these heteoroaromatic radicals may be optionally substituted with at least one radical chosen from hydrogen; C 1 -C 6 alkyl radicals, wherein the C 1 -C 6 alkyl radicals are optionally substituted with at least one radical chosen from hydroxyl, C 1 -C 4 alkoxy, (poly)hydroxyalkoxy, amino, C 1 -C 4 (di)alkylamino, C 2 -C 4 (poly)hydroxyalkylamino, carboxyl, sulfonyl, alkoxycarbonyl, and C 1 -C 4 thioether radicals; phenyl radicals optionally substituted with at least one radical chosen from C 1 -C 2 alkoxy, amino, C 1 -C 2 (di)alkylamino, carboxyl, sulfonyl, C 1 -C 4 alkyl, halogen and C 1 -C 2 thioether radicals; Z 1 is chosen from oxygen, sulfur, and radicals NR 4 ; Z 2 is chosen from nitrogen and radicals CR 3 ; R 1 and R 4 , which may be identical or different, are each chosen from C 1 -C 8 alkyl radicals, optionally substituted by at least one radical chosen from hydroxyl, C 1 -C 2 alkoxy, C 2 -C 4 (poly)hydroxyalkoxy, amino, C 1 -C 2 (di)alkylamino, carboxyl and sulfonic radicals; and optionally substituted phenyl radicals; R 2 and R 3, which may be identical or different, are each chosen from hydrogen; C 1 -C 6 alkyl radicals, optionally substituted by at least one radical chosen from hydroxyl, C 1 -C 2 alkoxy, C 2 -C 4 (poly)hydroxyalkoxy radical, amino, C 1 -C 2 (di)alkylamino, carboxyl, and sulfonic radicals; optionally substituted phenyl radicals; carboxyl radicals and sulfonylamino radicals; R 5 , R 6 , R 7 and R 8 , which may be identical or different, are each chosen from hydrogen; chlorine; bromine; linear and branched C 1 -C 6 hydrocarbonaceous chain which can form at least one ring chosen from 3- to 6-membered carbonaceous rings, and which can be saturated or unsaturated, of which at least one carbon atom of the carbonaceous chains can be replaced by at least one entity chosen from oxygen, nitrogen, sulfur, and SO 2 , and the carbon atoms of the carbonaceous chains, which may be identical or different, may be substituted by at least one halogen; provided that radicals R 5 , R 6 , R 7 and R 8 do not comprise a peroxide bond, a diazo radical, or a nitroso radical; and X is chosen from organic and inorganic anions.