| abstract |
(57) [PROBLEMS] To provide a pigment dispersant that realizes stable and good dispersibility and fluidity of a pigment, has excellent light transmittance, and is suitable for dispersing a phthalocyanine pigment, and contains the pigment dispersant In addition, the present invention provides a pigment dispersion composition that is excellent in pigment dispersibility, fluidity, and the like, has high coloring power, is excellent in alkali development suitability, and is suitable for paints, printing inks, and the like. A pigment dispersant containing a copolymer containing at least one monomer represented by the following general formula (I) as a copolymerization component, and at least a pigment and the pigment dispersant in an organic solvent. Is a pigment dispersion composition. In the following general formula (I), R 1 represents a hydrogen atom or a substituted or unsubstituted alkyl group. R 2 Represents a single bond or a divalent linking group. X is -CO -, -C (= O) O-, -CONH-, -OC (= O) -Represents a phenylene group. A represents a substituted or unsubstituted nitrogen-containing heterocyclic group. [Chemical 1] |