Patent ID: 7993446

Claim:
A dispersant for an organic pigment, comprising a compound represented by the following formula (1) or (2): wherein R D represents an aromatic ring or aromatic heteroring having from one to three groups, wherein said groups are selected from the group consisting of a sulfonic group, a metal salt of a sulfonic group, an ammonia salt of sulfonic group, an organic amine salt of a sulfonic group, and an organic quaternary compound salt of a sulfonic group, substituents X and Y may be the same or different and each represents a halogen atom, hydroxyl group, nitro group, alkyl group, alkoxyl group, or substituted or unsubstituted phthalimidomethyl group, R represents a hydrogen atom or a C 1 -C 12 alkyl group, and m and n are each an integer of from 0 to 3.