Patent ID: 7326259

Claim:
A dyeing composition for dyeing keratinous fibres, comprising, in an appropriate dyeing medium, at least one oxidation base and at least one direct dye of formula (I): wherein: Xz′ − is chosen from organic and inorganic anions; z and z′ are such that the overall charge of the molecule is zero; A is a positively-charged heterocyclic ring chosen from: substituted and unsubstituted thiazolium, wherein the thiazolium is substituted with at most one alkoxycarbonyl functional group; substituted and unsubstituted imidazolium; substituted and unsubstituted benzimidazolium; substituted and unsubstituted benzothiazolium pyridino; substituted and unsubstituted naphthothiazolium; and substituted benzothiazolium; B is chosen from optionally substituted C 6 -C 30 arylene groups and optionally substituted 5- to 10-membered heterocyclic groups; L is chosen from substituted and unsubstituted, linear, branched, and cyclic C 1 -C 30 alkylene radicals, wherein the C 1 -C 30 alkylene radicals are optionally interrupted or terminated by at least one heteroatomic group chosen from O, S, NH or NR, wherein R is chosen from linear and branched C 1 -C 10 alkyl radicals, wherein the C 1 -C 30 alkylene radicals are optionally interrupted by at least one radical chosen from heterocyclic and nonheterocyclic, aromatic and nonaromatic, cyclic radicals, and wherein the C 1 -C 30 alkylene radicals optionally carry at least one quaternary cationic charge, and wherein at least one carbon atom of the C 1 -C 30 alkylene radical is optionally replaced by a carbonyl group; R1, R2 and R3 are independently chosen from: optionally substituted, linear, branched and cyclic C 1 -C 10 alkyl radicals; optionally substituted, linear, branched and cyclic C 1 -C 10 arylalkyl radicals; optionally substituted aryl radicals; and linear and branched C 1 -C 10 aryloxyalkyl radicals; wherein at least one of the R1, R2, and R3 radicals may form, with the nitrogen atom carrying it, and optionally with L, an optionally substituted, saturated or unsaturated, 5- to 10-membered heterocycle that optionally comprises at least one additional heteroatom.