Patent ID: 7323045

Claim:
A magenta ink composition, containing, as colorants, at least one selected from compounds represented by undermentioned formula (1) and salts thereof, and at least one selected from compounds represented by undermentioned formula (2) and salts thereof; wherein, in formula (1), A represents a residue of a 5-membered heterocyclic diazo component A-NH 2 ; B 1 and B 2 represent —CR 1 ═and —CR 2 ═ respectively, or one thereof represents a nitrogen atom and the other thereof represents —CR 1 ═ or —CR 2 ═; R 5 and R 6 each independently represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulfonyl group, an arylsulfonyl group, or a sulfamoyl group, each group being optionally substituted; G, R 1 and R 2 each independently represents a hydrogen atom, a halogen atom, an aliphatic group, an aromatic group, a heterocyclic group, a cyano group, a carboxyl group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyl group, a hydroxy group, an alkoxy group, an aryloxy group, a silyloxy group, an acyloxy group, a carbamoyloxy group, a heterocyclic oxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an alkyl group-, aryl group-, or heterocyclic group-substituted amino group, an acylamino group, a ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkyl- or aryl-sulfonylamino group, a nitro group, an alkyl-or aryl-thio group, an alkyl- or aryl-sulfonyl group, an alkyl- or aryl-sulfinyl group, a sulfamoyl group, a sulfo group, or a heterocyclic thio group, each group being optionally substituted; and R 1 and R 5 , or R 5 and R 6 may be bonded together to form a 5- or 6-membered ring; wherein, in formula (2), A 1 represents an alkylene group, a phenylene group-containing alkylene group, or wherein R represents a hydrogen atom or an alkyl group and X represents NH 2 , OH or Cl.