Methods for dyeing hair with anthraquinone hair dyes having a quaternary ammonium side chain
AssigneeClairol Incorporated
InventorsMu-Ill Lim, Linas Stasaitis, Yuo-Guo Pan
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Abstract
Anthraquinone compounds of formula I ##STR1## wherein R.sub.1 and R.sub.2 are methyl and R.sub.3 is propyl, or R.sub.1 and R.sub.2 are ethyl and R.sub.3 is methyl and A.sup.- is a cosmetically acceptable anion, are useful for the dyeing of hair. Compounds of formula I may advantageously be employed with direct dyes. Compositions and a method of use employing same are disclosed.
Claims5
A method for dyeing a hair fiber on a living human head comprising contacting said fiber with a tinctorially effective amount of an anthraquinone compound of formula I ##STR26## wherein R.sub.1 and R.sub.2 are methyl and R.sub.3 is propyl, or R.sub.1 and R.sub.2 are ethyl and R.sub.3 is methyl, and A.sup.- is a cosmetically acceptable anion, in a cosmetically acceptable vehicle;
- said contacting being for a time sufficient to dye said fiber.
Dependencies are inferred from the claim text.