| abstract |
Vinyl polymer produced by radical polymerization of an ethylenically unsaturated monomer in the presence of compound (a1) having two hydroxyl groups and one thiol group in the molecule, and having two hydroxyl groups in one terminal region A hydroxyl group in (a) and, optionally, a hydroxyl group in a polyol compound (c) other than the vinyl polymer (a); An acid anhydride group in tetracarboxylic acid anhydride (b), and optionally an acid anhydride group in tricarboxylic acid anhydride (d); A polyester dispersant produced by reacting with Disclosed is a polyester dispersing agent produced by reacting with a process for producing the same. The polyester dispersant according to the present invention can provide a dispersion having a low use amount and excellent dispersibility, fluidity, and storage stability, and further, offset ink, gravure ink, color filter resist ink and ink jet ink, Suitable for paint and colored resin composition. |