Use and dyeing of the phenyl - azo - benzene compound of the cationicity for dyeing the keratin fiber the constituent and dyeing mannered

摘要

PROBLEM TO BE SOLVED: To obtain a composition which comprises a specific phenyl-azo-benzene compound and an acid adduct salt thereof, has good durability, can give various strong color tones, and is used for dyeing keratin substances such as human hair. ;SOLUTION: This composition for dyeing keratin fibers comprises a compound of the formula [R1-R3 and R'1-R'3 are H, a halogen, a 1-6C alkylcarbonyl or the like; A is NR4R5 group (R4 and R5 are H, a 1-6C alkyl or the like), OR6 group (R6 is H, a 1-6C monohydroxyalkyl or the like)], and their acid adduct salts (preferably hydrochloride), preferably bis[2-(3-methyl-3H-imidazol-1- ium)ethyl] [4-(4-nitrophenylazo)phenyl]amine-dichloride-monohydrate or the like. The composition preferably has a pH value of 3-12. It is preferable that the compound of the formula is contained in a concentration of 0.005-12 wt.% based on the whole weight of the composition.;COPYRIGHT: (C)2000,JPO