Patent ID: 7077899

Claim:
A pigment composition containing an organic pigment or a carbon black pigment, a resin pigment dispersing agent having a weight average molecular weight of 1,000 to 100,000 and a pigment dispersing agent of the formula (1), wherein X 1 is —NH—, —O—, —CONH—, —SO 2 NH—, —CH 2 NH—, —CH 2 NHCOCH 2 NH— or —X 3 —Y—X 4 —, each of X 2 and X 4 is independently —NH— or —O—, X 3 is —CONH—, —SO 2 NH—, —CH 2 NH—, —NHCO— or —NHSO 2 —, Y is an alkylene group which has 20 or less carbon atoms and may have a substituent, an alkenylene group which has 20 or less carbon atoms and may have a substituent, or an arylene group which has 20 or less carbon atoms and may have a substituent, Z is —SO 3 M or —COOM, R 1 is a heterocyclic ring residue which may have a substituent, an aromatic ring residue which may have a substituent, or a group represented by the formula (2), Q is —O—R 2 , —NH—R 2 , a halogen group, —X 1 —R 1 or —X 2 —Y-Z, R 2 is a hydrogen atom, an alkyl group which may have a substituent or an alkenyl group which may have a substituent, and M is one equivalent of a monovalent to trivalent cation, wherein X 5 is —NH— or —O—, each of X 6 and X 7 is independently —NH—, —O—, —CONH—, —SO 2 NH—, —CH 2 NH— or —CH 2 NHCOCH 2 NH—, each of R 3 and R 4 is independently a heterocyclic ring residue which may have a substituent, an aromatic ring residue which may have a substituent, or —Y-Z and Y and Z have the same meanings as those in the formula (1).