| abstract |
(57) Abstract: A pigment dispersant for stably dispersing a pigment in a mixed solvent of water and alcohol, and an aqueous system containing the pigment dispersant and having excellent light resistance, water resistance, and weather resistance. Provide pigment ink. The pigment dispersant is a copolymer of an alkylene oxide ester of a carboxylic acid having an unsaturated group, an acrylate ester having a salt-forming group, and a copolymerizable monomer having an unsaturated group, and polysiloxane. It contains a copolymer obtained by block-polymerizing a polymer having a group. |