Composition for oxidation dyeing of keratinic fibers, especially human hair, containing a 3-amino azo derivative as direct dye

摘要

Oxidation hair dye compositions containing a 3-amino pyridine azo derivative of formula (I) as direct dye. Compositions for oxidation dyeing of keratinic fibers, particularly human hair, comprising, in a suitable medium, (i) at least one heterocyclic oxidation base and (ii) at least one 3-amino pyridine azo derivative of formula (I) as direct dye: B = a group of formula (Ia) or (Ib); R = 1-4 C alkyl; R1 = H, halogen such as Cl, Br or F, 1-4 C alkyl or 1-4 C alkoxy; R2 = H, 1-4 C alkyl or 1-4 C alkoxy; R4 = H, halogen such as Cl, Br or F, 1-4 C alkyl, nitro, amino or acyl(C1-C4)amino; R3 = H or R4 and R3 may together form an unsaturated 6-membered ring carrying an OH substituent which is chelated with one of the N atoms of azo group; A = -N(R5)(R6); R5 = H, 1-4 C alkyl, 1-4 C monohydroxyalkyl or 2-4 C polyhydroxyalkyl; R6 = H, 1-4 C alkyl, 1-4 C monohydroxyalkyl or 2-4 C polyhydroxyalkyl, phenyl ring or -CH2-SO3Na; X = monovalent or divalent anion such as Cl, Br, F, I, OH, bisulfate, or alkyl(C1-C6)sulfate such as (m)ethylsulfate.