Patent ID: 8011774

Claim:
An azo dye represented by formula (1): wherein R 11 represents an alkyl group, a cycloalkyl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, an aryl group, a heterocyclic group, a cyano group, an alkoxy group, an aryloxy group, an acyloxy group, a carbamoyloxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an amino group including an alkylamino group, an anilino group and a heterocyclic amino group; an acylamino group, an aminocarbonylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, a sulfamoylamino group, an alkyl- or aryl-sulfonylamino group, an alkylthio group, a sulfamoyl group, an alkyl- or aryl-sulfonyl group, an alkyl- or aryl-sulfonyl group, an acyl group, an aryloxycarbonyl group, an alkoxycarbony group, a carbamoyl group, an aryl- or heterocyclic-azo group or an imido group, R 12 represents a hydrogen atom or a monovalent substituent, Ar 1 represents a group selected from members (1) of heterocyclic groups set forth below, and X represents atoms necessary to form a ring an atomic group selected from —C(R 13 )═N—, —N═C(R 13 )—, or —C(═O)—N(R 13 )—C(═O)— in which R 13 represents a hydrogen atom or a substituent group; Members (1) of Heterocyclic Groups wherein, in members (1) of heterocyclic groups, R 61 , R 62 , R 63 , R 64 and R 65 each independently represents a hydrogen atom or a substituent.