Patent ID: 7537620
Filing Date: 2009-05-26
Classification: A61K,A61Q

Abstract:
1. A method for dyeing hair comprising the steps of: (i) applying to hair an amount of hair colorant comprising at least one thiazolium azo dye of general formula (I) sufficient for dying the hair; (ii) leaving the hair colorant on the hair at a temperature of 15C. to 50C. for a period of 1 to 60 minutes; (iii) rinsing the hair with water; and (iv) drying the hair; wherein: R1 stands for a saturated or unsaturated (C R2 and R3 can be equal or different and, independently of each other, stand for hydrogen, a halogen atom, a saturated or unsaturated (C R4 stands for hydrogen, a saturated or unsaturated (C 1 -C 12 )-alkyl group, a halogen atom-substituted (C 1 -C 12 )-alkyl group, a hydroxy-(C 1 -C 12 )-alkyl group, an amino-(C 1 -C 12 )-alkyl group or a benzyl group; R5 and R6 can be equal or different and, independently of each other, stand for hydrogen, a halogen atom, a saturated or unsaturated (C