Patent ID: 7896931

Claim:
A hair dye composition comprising: (a) an azo dye represented by any one of the following formulas (1) to (5): wherein R 1 represents a hydrogen atom or a substituent and A represents a monocyclic or bicyclic, aromatic heterocyclic residue which may have a substituent and has a free valence at a carbon atom of the residue, with the proviso that R 1 and A each contains, in the structure thereof, none of a carboxy group, a sulfo group and a quaternary ammonium group, wherein R 2a and R 2b each represents a hydrogen atom or a substituent, and A′ represents a monocyclic or bicyclic, aromatic heterocyclic residue which may have a substituent and has a free valence at a carbon atom of the residue, with the proviso that R 2a , R 2b , and A′ each contains, in the structure thereof, none of a carboxy group, a sulfo group, and a quaternary ammonium group, wherein R 2a , R 2b , and A′ have the same meanings as defined above, wherein R represents a coupler component, X 1 , X 2 , X 3 , and X 4 represent atoms which are coupled together with the carbon atom sandwiched between X 1 and X 4 to form a 5-membered heteroaromatic ring, V 1 and V 2 each represents a substituent, and a1 and a2 each stands for an integer from 0 to 3, and wherein R 3 represents a hydroxy group, an alkylsulfonylamino group, an arylsulfonylamino group, or —CH(R 4 )(R 5 ), R 4 and R 5 each representing a substituent having a Hammett's constant σ of 0.2 or greater and less than 1.4, W represents a sulfur atom or N—R 6 , R 6 representing a substituent, X, Y and Z each represents a nitrogen atom or a carbon atom, with the proviso that at least one of X, Y and Z is a nitrogen atom and when Z represents a nitrogen atom, either one or both of X and Y represent a nitrogen atom, R 7 and R 8 each represents a substituent, and b stands for from 0 to 2, with the proviso that when b stands for 2, two R 8 s may be coupled to form an aromatic ring or a heteroaromatic ring, and (b) at least one dyeing ingredient selected from the group consisting of an oxidizing agent, oxidation dye, and a direct dye.