Process for dyeing keratinous fibres, at acid pH using 6- or 7-m

Details Process for dyeing keratinous fibres, at acid pH using 6- or 7-m Process for dyeing keratinous fibres, at acid pH using 6- or 7-m

1991-03-07

1993-05-04

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

8405, 8406, 8414, 8416, 8423, 8424, 424 70, 564441, 564442, A61R 713

Patent

active

052077985

ABSTRACT:
Process for dyeing keratinous fibres, in particular human keratinous fibres such as hair, characterized in that there is applied to these fibres a composition containing, in a suitable dyeing mixture, at least one indole-based coupler, of the formula: ##STR1## in which R.sub.1 designates a hydrogen atom or a C.sub.1 -C.sub.4 alkyl radical; R.sub.2 and R.sub.3, which may be identical or different, designate a hydrogen atom, a C.sub.1 -C.sub.4 lower alkyl radical, a carboxyl radical or an alkoxycarbonyl radical; X designates a hydrogen atom, a C.sub.1 -C.sub.4 lower alkyl radical, a C.sub.1 -C.sub.18 alkoxy radical, a halogen atom, a C.sub.2 -C.sub.20 acyloxy radical or an acetylamino group; the OH group occupying the 6- or 7- positions of the aromatic ring; as well as the salts of these compounds;

REFERENCES:
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patent: 4885006 (1989-12-01), Grollier et al.
patent: 4888027 (1989-12-01), Grollier et al.
patent: 5034015 (1991-07-01), Junino et al.
French Search Report of FR 90 02975.

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