| 摘要 |
Provided is a hair dye composition comprising as a direct dye a compound represented by the following formula (1), (2), (3) or (4): [wherein, R1 and R1' each independently represents a (substituted) C1-6 alkyl or a (substituted) aryl group; W and W' each independently represents a group -A-NR2R3 or a (substituted) heterocyclic aromatic group; A and A' each independently represents a divalent (substituted) aryl group; R2, R2' and R3 each independently represents H, a (substituted) alkyl or a (substituted) aryl group, or R2, R2' or R3 may be bonded to A or A', thereby forming a heterocycle, R2 and R3, or R2 and R2' are coupled to form a heterocycle, together with the adjacent atom; R4 to R6 each independently represents H, (substituted) alkyl or (substituted) alkenyl group; Q represents a divalent organic group; X represents a modified carboxy group, an -SO2-T- group (in which, T represents an alkyl, alkenyl or aryl) or a heterocyclic group; Y represents a CN- or heterocyclic group; Z represents a cationic group, and An- represents an anion). The hair dye composition according to the present invention has markedly high hair dyeing power, has less color fade over time and undergoes a small color tone change in the dye even after storage.
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