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US 4,784,667 AGranted
Oxidation hair dyes comprising diamino-substituted pyridines and amino-substituted aromatics as precursors
AssigneeHenkel Kommanditgesellschaft auf Aktien
InventorsNorbert Maak, Peter Flemming, Dieter Schrader
Life of this patent
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Abstract
This invention is directed to oxidation hair dye compositions and their use in the dyeing of human hair. The compositions consist essentially of precursors comprising 2,3-diamino-6-methoxy-pyridines and aromatic amines or diamines. The combination of oxidation dye precursors according to the invention gives bright, deep blue dye finishes having high stability to heat and light.
Claims8
An oxidation hair dyestuff composition for the dyeing of human hair, comprising
- (a) from about 0.2 to 5 percent by weight of the combination of (1) at least one 2,3-diamino-6-methoxypyridine of the formula ##STR4## wherein R is methyl or hydroxyethyl, with (2) at least one compound selected from the group consisting of 0-phenylene diamine, p-phenylene diamine, 2-aminophenol, and 4-aminophenol, which may be unsubstituted or substituted by one or two C.sub.1 -C.sub.4 -alkyl or C.sub.2 -C.sub.4 -hydroxyalkyl on the nitrogen atom as well as by one or more C.sub.1 -C.sub.4 -alkyl, alkoxy having from 1 to 4 carbon atoms, or halogens on the aromatic nucleus, the molar ratio of component (1) to component (2) being from about 2:1 to 1:2,
- (b) from about 0.5 to 30 percent by weight of wetting and emulsifying agents,
- (c) from about 0.1 to 25 percent by weight of thickeners, and
- (d) the balance water.
1 more element
Dependencies are inferred from the claim text.