Patent ID: 8202327

Claim:
A pigment composition comprising: (A) an azo pigment represented by formula (1): wherein R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group; R 2 represents a substituent; R 55 represents a substituent; R 56 represents a hydrogen atom or a substituent; Z represents an electron-withdrawing group having a Hammett constant σp of 0.2 or greater; m represents an integer of 0 to 5; n represents an integer of 1 to 4; when n is 2 to 4, the compound is a dimer, trimer, or tetramer formed via R 1 , R 2 , R 55 , R 56 , or Z; and formula (1) has no ionic hydrophilic group, and at least one of (B) a coloring agent represented by formula (2), or (C) at least one additive represented by formula (3) or an additive represented by formula (4): wherein R 1 , R 2 , R 56 , Z, m, and n are as defined above: wherein G 2 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group; R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group; R 22 represents a substituent; m is as defined above; and formula (3) has no ionic hydrophilic group: wherein R 60 represents a hydrogen atom or a substituent; R 58 and R 59 each independently represent a hydrogen atom or a substituent; and R 58 and R 59 may be taken together to form a 5- or 6-membered ring.