Patent ID: 7611546

Claim:
A composition for dyeing human keratin fibers comprising, in a cosmetically acceptable medium, at least one direct dye chosen from direct dyes of formulae (I), (II) and (III): wherein: A 1 , A 2 and A 3 , independently of each other, are chosen from cationic heterocyclic groups comprising at least one quaternized nitrogen and optionally fused with at least one aromatic nucleus, and wherein A 1 , A 2 and A 3 are attached to the at least one C≡C functional group via one of the carbon atoms of the cationic heterocycle or via the at least one aromatic nucleus to which the cationic heterocycle is optionally fused; and wherein said at least one quaternized nitrogen atom optionally bears at least one radical chosen from amino radicals; C 2 -C 20 acyl radicals; and C 1 -C 25 alkyl radicals optionally substituted with at least one radical chosen from phenyl, phenyl-carbonyl, (C 1 -C 4 )alkoxycarbonyl, sulfo (—SO 3 M, wherein M is chosen from a hydrogen atom and alkali metals), ethylenyl (—CH═CH 2 ), acetylenyl (—C≡CH), and phenyl-acetylenyl (—C≡C—C 6 H 5 ); A 1 , A 2 and A 3 may be optionally substituted, beyond the radicals borne by the quaternized nitrogen atoms, with at least one radical chosen from halogen atoms, C 1 -C 25 alkyl radicals, (C 1 -C 4 ) alkoxy radicals, (C 1 -C 20 )alkylcarbonylamino radicals, and phenyl radicals; B 1 , B 2 and B 3 , independently of each other, are aromatic nucleuses chosen from phenyl groups, anthracenyl groups, and naphthyl groups, attached to one or two C≡C functional groups; B 1 , B 2 and B 3 may be optionally substituted with at least one group chosen from: amino groups optionally bearing one or two radicals, independently of each other, chosen from C 1 -C 18 alkyl, (C 1 -C 20 )alkylcarbonyl, (C 1 -C 20 )alkylsulfonyl, and phenyl optionally substituted with a C 1 -C 4 alkoxy group; hydroxyl; C 1 -C 4 alkoxy; C 1 -C 10 alkyl optionally bearing an amino group; phenoxy; sulfo (—SO 3 M, wherein M is chosen from a hydrogen atom and alkali metals); cyano; trifluoromethyl; halogen chosen from chlorine, fluorine and bromine; and acetylthio (CH 3 —CO—S—); n is equal to 1 or 2; the electrical neutrality of the at least one direct dye being optionally assured via at least one cosmetically acceptable anion; and wherein the composition also comprises at least one surfactant present in an amount ranging from 0.01% to 50% by weight relative to the total weight of the composition, and chosen from anionic, amphoteric, nonionic, zwitterionic and cationic surfactants.