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1. (WO1999006016) DYES

Pub. No.:    WO/1999/006016    International Application No.:    PCT/EP1998/004604
Publication Date: Fri Feb 12 00:59:59 CET 1999 International Filing Date: Thu Jul 23 01:59:59 CEST 1998
IPC: A61K 8/49
A61Q 5/10
Applicants: HENKEL KOMMANDITGESELLSCHAFT AUF AKTIEN
HÖFFKES, Horst
SCHRADER, Dieter
TANAKA, Hiroshi
Inventors: HÖFFKES, Horst
SCHRADER, Dieter
TANAKA, Hiroshi
Title: DYES
Abstract:
The invention relates to oxidation dyes, containing at least one coupling component and at least one derivative of 5,6-dihydroxyindoline in an aqueous support substance, said 5,6-dihydroxyindoline being of formula (I), wherein R1 means hydrogen, a C1-C4 alkyl group or a C1-C4 hydroxyalkyl group, R2 means hydrogen or a -COOH- group which can also be a salt with a physiologically suitable cation, R3 is hydrogen or a C1-C4 alkyl group, R4 is hydrogen, a C1-C4 alkyl group or a group -CO-R6 wherein R6 represents a C1-C4 alkyl group, and R5 is one of the groups given for R4, independently of each other, or a physiologically suitable salt of these compounds with an organic or an inorganic acid. The inventive dyes are free from oxidation dye initial products of the developer component type, and produce a colour without red cast, especially in black tones. In particular, it is possible to dye partially or fully greying hair in shades which correspond very well with the non-greying hair.