Colorants for keratin fibers comprising a 5,6-dihydroxyindoline derivative and a secondary intermediate

US6090161A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Horst Hoeffkes · Goldkronach, DE
• Dieter Schrader · Goldkronach, DE
• Hiroshi Tanaka · Kani, JP

Key dates

• Filing date: Jul 31, 1998
• Grant date: Jul 18, 2000
• Expiry date: Jul 31, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K8/492
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Oxidation colorants which contain at least one secondary intermediate and at least one derivative of 5,6-dihydroxyindoline corresponding to formula (I): ##STR1## in which--independently of one another--R.sup.1 is hydrogen, a C.sub.1-4 alkyl group or a C.sub.1-4 hydroxyalkyl group, PA1 R.sup.2 is hydrogen or a --COOH group which may even be present as a salt with a physiologically compatible cation, PA1 R.sup.3 is hydrogen or a C.sub.1-4 alkyl group, PA1 R.sup.4 is hydrogen, a C.sub.1-4 alkyl group or a group --CO--R.sup.6 where R.sup.6 is a C.sub.1-4 alkyl group and PA1 R.sup.5 is one of the groups mentioned for R.sup.4, or a physiologically compatible salt of these compounds with an organic or inorganic acid in an aqueous carrier and which are free from oxidation dye precursors of the primary intermediate type enable hair to be colored in particular in black tones with no tinges of red. In particular, completely or partly grey hair can be colored in tones which come very close to the color of the hair before greying.