Pigment dispersant composition, production method therefor, pigment dispersion, and actinic-ray-curable ink-jet ink

A pigment dispersant composition comprising:

• a polyglycol component that has at least one alkylene chain selected from the group consisting of CH2CH2, CH2CH(CH3), and CH2CH2CH2CH2, and has a number average molecular weight in a range from 1,000 to 4,000;
• and
• a polymer component that has a number average molecular weight in a range from 5,000 to 20,000 and that has:
• from 50 to 80% by mass of a constituent unit (1) derived from a macromonomer represented by the following formula (1) and having a number average molecular weight in a range from 1,000 to 4,000,
• from 5 to 25% by mass of a constituent unit (2) derived from at least one functional group-containing vinyl-based monomer selected from the group consisting of a carboxy group-containing vinyl-based monomer and an amino group-containing vinyl-based monomer, and
• from 0 to 45% by mass of a constituent unit (3) derived from an additional monomer,
• wherein the polyglycol component is at least one material selected from the group consisting of a polyalkylene glycol, a polyalkylene glycol monoalkyl (C1 to C18) ether, and a polyalkylene glycol dialkyl (C1 to C4) ether, and
• a content of an organic compound having a boiling point of 250° C. or lower is 1% by mass or less:
• wherein R represents a hydrogen atom or a methyl group, R1 represents CH2CH2 or CH2CH2OCH2CH2, and m+n=20 to 100.