abstract |
The present invention provides a novel cationic oligomeric azo dye and a method for dyeing keratin-containing fibers using the same. By reaction of a monoazo intermediate formula (1a) with a diamino compound such as ethylenediamine, N, N′-dimethylethylenediamine, 1,3-propanediamine, 2,2-dimethyl-1,3-diaminopropane, cysteamine and the like. The resulting cationic oligomeric azo dye. (Wherein Y represents an anion and Z represents a benzimidazolyl group) [Selection figure] None |