Patent ID: 6312478
Filing Date: 2001-11-06
Classification: A61K,A61Q,D06P

Abstract:
A method for coloring hair, said method comprising the steps of:a) applying to the hair, in an amount sufficient for the coloring of the hair, a colorant, said colorant comprising at least one monomethine or polymethine dye of tautomeric formula (Ia/Ib), or a physiologically tolerated salt thereof,W=L-V'(Ia).revreaction.W'-L=V(Ib),wherein W=L-V' and W'=L-V are tautomers, and said W and said V each, independently of each other, is a substituted five-member or six-member heterocyclic ring, so that said W and W' are the same and said V and V' are the same, except that said W and said V each have a --C(.dbd.O)-- group and said W' and said V' each have a .dbd.C(OH)-- group in place of said --C(.dbd.O)-- group in said substituted five-member or six-member heterocyclic ring, and wherein said substituted five-member or six-member heterocyclic ring for said W and for said V is each, independently of each other, selected from the group consisting of substituted pyrazolones, substituted pyridones, substituted dioxothiazolines, substituted rhodanines, substituted dioxoimidazolidines and substituted barbituric acid; wherein L represents a bridging group of formula--[--CH.dbd.CH--].sub.m --CR.dbd.[.dbd.CH--CH.dbd.].sub.n.dbd.,wherein R is hydrogen, a phenyl group, a halogen atom, a methyl group or a carboxamido group, and wherein m and n, independently of each other, are each 0, 1 or 2, with the proviso that n+m does not exceed 2;b) after the applying of step a), allowing the colorant to act on the hair for a time interval of from 10 to 45 min at 20 to 50.degree. C.; andc) rinsing the hair with water and subsequently drying the hair.