Patent ID: 7662193

Claim:
A hair dye composition comprising a dissociative direct dye of the following formula (1): wherein Ar and Ar′ are each free of a carboxy group, a sulfo group and a quaternary ammonium group; Ar represents an aromatic or a heterocyclic aromatic group which may have a substituent, while Ar′ represents an aromatic group which may have, as a substituent, an alkyl group or an electron withdrawing group, or a heterocyclic aromatic group represented by any one of the following formulas (Cp-1) to (Cp-4): * means a bonding position to a nitrogen atom in the formula (1), R 1 to R 5 each represents a hydrogen atom, a C 1 -C 8 alkyl group, an alkoxy group, an alkoxyalkyl group, a hydroxyalkyl group, an aryl group, an aryloxy group, an alkylthio group or an arylthio group, and R 4 and R 5 may be the same or different and may be coupled to form a saturated ring, an aromatic ring or a heteroaromatic ring which may have a substituent together with two vicinal carbon atoms; and W represents an electron withdrawing group; or a salt thereof, wherein when Ar is a furyl group, Ar′ is not represented by the formula (Cp-1).