Patent ID: 7198648

Claim:
In a process for coloring keratin fibers, more particularly human hair, in which: optionally, a pretreatment preparation is applied to the fibers, a colorant M2 is then applied to the fibers, optionally having been mixed immediately before application to the fibers from: a component M2a containing at least one oxidation dye precursor of the primary intermediate type and/or an indole and/or indoline derivative and a component M2b containing an oxidizing agent and/or an enzyme, the colorant M2 and the colorant M2 being rinsed off the fibers after a contact time of from 5 to 30 minutes, wherein said process comprises adding to at least one of the pre-treatment preparation or preparations M2a, M2b or M2 a compound of formula (I): wherein A and B independently represent hydrogen, halogen, a C 1-4 alkyl group, a C 3-6 cycloalkyl group, a C 1-4 monohydroxyalkyl group, a C 2-4 oligohydroxyalkyl group, a C 1-4 aminoalkyl group, a group —OR or a group NR 1 R 2 ; R 1 and R 2 independently represent hydrogen, a C 1-4 alkyl group or a C 1-4 monohydroxyalkyl group or R 1 and R 2 together with the nitrogen atom form a saturated ring; C represents a group —OR, NR 1 R 2 , —OP(O)(OR 3 ) 2 , a C 1-4 monohydroxyalkyl group, a C 2-4 oligohydroxyalkyl group or a C 1-4 alkyl group; D represents a group —OR, a carboxy group, a C 1-22 alkoxycarbonyl group, a formyl group, a group —CH 2 OR or a group —CH 2 —NR 2 , E represents a group —OR, —OP(O)(OR 3 ) 2 , a C 1-4 monohydroxyalkyl group or a C 2-4 oligohydroxyalkyl group; —R represents hydrogen, a C 1-4 alkyl group, a C 1-22 acyl group, a hydroxy-C 2-22 -acyl group, a C 2-10 carboxyacyl group, a C 3-10 oligocarboxyacyl group, an oligocarboxymonohydroxy-C 3-10 -acyl group, an oligocarboxyoligohydroxy-C 3-10 -acyl group, a C 3-8 cycloalkyl group, a C 1-4 monohydroxyalkyl group, a C 2-4 oligohydroxyalkyl group, an aryl group which may contain a hydroxy, nitro or amino group, a heteroaromatic group or a group —CH 2 CH 2 NR 1 R 2 , where R 1 and R 2 are as defined above; and —R 3 represents hydrogen or a C 1-5 alkyl group; or any of the corresponding physiologically compatible salts thereof.