Patent ID: 6962610

Claim:
A hair dye composition comprising a dissociative direct dye represented by the following formula (1): wherein, R 1 , R 2 , R 3 and R 4 each independently represents a hydrogen atom or a substituent, and X represents a hydroxyl group or —NHSO 2 R 5 , in which R 5 represents an alkyl, aryl or heterocyclic group, with the proviso that each of the groups may have one or more substituents; and in the dissociative direct dye (1) is a group represented by any one of the following formulas (Cp-4) through (Cp-11): in formulas and (Cp-4) through (Cp-11), * is a position bonding to the benzylidene group in formula (1), in formula (Cp-4), R 17 and R 18 each independently represents a hydrogen atom or an alkyl, aryl or heterocyclic group, in formula (Cp-5), R 21 and R 22 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, and R 23 represents a hydrogen atom or an alkyl, aryl or heterocyclic group, in formula (Cp-6), R 24 , R 25 and R 26 each independently represents a hydrogen atom or a substituent, in formula (Cp-7), R 30 and R 31 each independently represents a hydrogen atom or a substituent, and Z 1 represents an atomic group necessary for the formation of a 5- or 6-membered ring together with N—C═N, in formula (Cp-8), R 32 represents a hydrogen atom or a substituent, and Z 2 represents an atomic group necessary for the formation of a 5- or 6-membered ring together with N—C═N, in formula (Cp-9), R 33 , R 34 and R 35 each independently represents a hydrogen atom or a substituent, Z 3 represents a nitrogen atom or —C(R 36 )═, R 36 representing a hydrogen atom or a substituent, with the proviso that when Z 3 represents —C(R 36 )═, R 34 and R 36 may be coupled to form a 5-membered or 6-membered ring, in formula (Cp-10), R 37 and R 38 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, R 39 represents a hydrogen atom or a substituent, u stands for an integer of from 0 to 4, and Z 4 represents —SO 2 — or —SO—, and in formula (Cp-11), R 40 and R 41 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, R 42 , R 43 and R 44 each independently represents a hydrogen atom or a substituent, and t stands for an integer of from 0 to 4, with the proviso that the above-described groups may have one or more substituents).