Hair dye composition

A hair dye composition comprising a dissociative direct dye represented by the following formula (1) or a salt thereof:

• wherein, R1, R2, R3 and R4 each independently represents a hydrogen atom or a substituent, X represents a hydroxyl group or —NHSO2R5, in which R5 represents an alkyl, aryl or heterocyclic group, A represents a group represented by any one of the below-described formulae which group may have one or more substituents:
• wherein * is a position bonding to the nitrogen atom in formula (1),
• in formula (Cp-1), R11 represents a cyano, acyl, aryl or heterocyclic group, or —C(R101)═C(R102)—R103, in which R101, R102 and R103 each independently represents a hydrogen atom or a substituent with the proviso that at least one of R102 and R103 is an electron attractive group having a Hammett σp value of 0.1 or greater,
• in formula (Cp-2), R12 represents a cyano, alkoxycarbonyl, carbamoyl, aryl or heterocyclic group, and R13 and R14 each independently represents a hydrogen atom or an alkyl, aryl or heterocyclic group,
• in formula (Cp-3), R15 represents a hydrogen atom or an alkyl, aryl, heterocyclic, amino, alkylamino, arylamino, heterocyclic amino, alkoxy, acylamino, alkoxycarbonylamino, ureido, alkoxycarbonyl, carbamoyl or cyano group, and R16 represents a hydrogen atom or an alkyl, aryl or heterocyclic group,
• in formula (Cp-4), R17 and R18 each independently represents a hydrogen atom or an alkyl, aryl or heterocyclic group,
• in formula (Cp-5), R19 and R20 each independently represents a hydrogen atom or an alkyl, aryl or heterocyclic group,
• in formula (Cp-6), R21 and R22 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, and R23 represents a hydrogen atom or an alkyl, aryl or heterocyclic group,
• in formula (Cp-8), R27 and R28 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, R29 represents a substituent, and s stands for an integer of from 0 to 6,
• in formula (Cp-9), R30 and R31 each independently represents a hydrogen atom or a substituent, and Z1 represents an atomic group necessary for the formation of a 6-membered ring together with N—C═N, resulting in a ring system selected from the group consisting of:
• wherein R115 represents a hydrogen atom or an alkyl group, and R116 represents a hydrogen atom or an alkyl, aryl, alkoxy, aryloxy, amino, alkylamino, arylamino, heterocyclic amino, acylamino, ureido, alkoxycarbonylamino, alkylsulfonylamino, arylsulfonylamino, alkylthio, or arylthio group,
• in formula (Cp-10), R32 represents a hydrogen atom or a substituent, and Z2 represents an atomic group necessary for the formation of a 6-membered ring together with N—C═N,
• in formula (Cp-11), R33, R34 and R35 each independently represents a hydrogen atom or a substituent, Z3 represents a nitrogen atom or —C(R36)═, in which R36 represents a hydrogen atom or a substituent, with the proviso that when Z3 represents —C(R36)═, R34 and R36 may be coupled to form a 5-membered or 6-membered ring, and
• in formula (Cp-12), R37 and R38 each independently represents a cyano, carbamoyl, alkoxycarbonyl, alkylsulfonyl or arylsulfonyl group, R39 represents a hydrogen atom or a substituent, u stands for an integer of from 0 to 4 and Z4 represents —SO2— or —SO.