Patent ID: 7128764

Claim:
An agent for coloring keratin fibers based on a developer-coupler combination, said agent containing, as the coupler, at least one 3-aminophenol derivative of formula (I), or a physiologically compatible, water-soluble salt thereof: wherein R denotes an aromatic, heterocyclic 5-membered ring of formula (Ia): wherein X1, X1, X3, and X4, independently of each other, denote sulfur, nitrogen, N—R1, oxygen, C—R2, C—R3, C—R4, or C—R5, provided that at least one and at the most three of the X1 to X4 groups denote nitrogen, N—R1, sulfur, or oxygen and, if there are at least two heteroatoms in formula (Ia), at the most one of the X1 to X4 groups denotes sulfur, N—R1, or oxygen; R1 denotes hydrogen, a (C 1 –C 6 )-alkyl group, a phenyl group, a (C 2 –C 4 )-hydroxy-alkyl group, or an acetyl group; R2, R3, R4, and R5, independently of each other, denote hydrogen, a halogen atom, a cyano group, a (C 1 –C 6 )-alkyl group, a (C 1 –C 4 ) -alkoxy group, a (C 1 –C 4 )-alkyl thioether group, a mercapto group, a nitro group, an amino group, a (C 1 –C 4 )-alkylamino group, a di(C 1 –C 4 )-alkylamino group, a hydroxy-(C 2 –C 4 )-alkylamino group, a di[hydroxy-(C 2 –C 4 )-alkyl] amino group, a [di-hydroxy-(C 3 –C 4 )-alkyl]amino group, a trifluoromethyl group, a —C(O)CH 3 group, a C(O)CF 3 group, a —C(O)H group, a —Si(CH 3 ) group, a (C 1 –C 4 )-hydroxyalkyl group, or a (C 2 –C 4 )-dihydroxyalkyl group.