Patent ID: 7291183

Claim:
An agent for coloring fibers (A), containing: (a) at least one hydrazone derivative of formula (I) or a physiologically compatible salt thereof, wherein X denotes oxygen or sulfur, A denotes hydrogen, an acetyl group, a trifluoroacetyl group, a formyl group, a (C 1 -C 6 )-alkylsulfonyl group or an arylsulfonyl group; R1 denotes a saturated or unsaturated (C 1 -C 12 )-alkyl group, a halogen (F, Cl, Br, I)-substituted (C 1 -C 12 )-alkyl group, a hydroxy-(C 1 -C 12 )-alkyl group, an amino-(C 1 -C 12 )-alkyl group, a sulfonic acid-(C 1 -C 12 )-alkyl group, a formyl group, a C(O)—(C 1 -C 12 )-alkyl group, a C(O)-phenyl group, a C(O)NH—(C 1 -C 12 ) alkyl group, a C(O)NH-phenyl group, a substituted or unsubstituted phenyl group or a benzyl group; R2 and R3 can be equal or different and independently of each other denote hydrogen, a halogen atom (F, Cl, Br, I), a saturated or unsaturated (C 1 -C 12 )-alkyl group, a halogen (F, Cl, Br, I)-substituted (C 1 -C 12 )-alkyl group, a hydroxyl-(C 1 -C 12 )-alkyl group, a (C 1 -C 12 )-alkoxy group, a cyano group, a nitro group, an amino group, a (C 1 -C 12 )-alkylamino group, a (C 1 -C 12 )-dialkylamino group, a carboxylic acid group, a C(O)O(C 1 -C 12 )-alkyl group, a substituted or unsubstituted C(O)O-phenyl group, a substituted or unsubstituted phenyl group or a naphthyl group; or R2 and R3 together with the remainder of the molecule form a heterocyclic or carbocyclic, saturated or unsaturated, substituted or unsubstituted ring system; (b) at least one known coupler or a physiologically compatible salt thereof; and (c) a persulfate salt as oxidant.