| 摘要 |
PROBLEM TO BE SOLVED: To provide an acrylic copolymer for obtaining a coloring material dispersion having both dispersion stability and solubility in alkali development even in a composition containing a coloring material in high concentration, and also having excellent heat resistance, and a photosensitive coloring resin composition having excellent plate-making characteristics.SOLUTION: There is provided an acrylic copolymer having a structure represented by formula (A) having an ethylenically unsaturated group on the molecular side chain, a structure represented by formula (B) having a tertiary amino group on the side chain and/or a structure represented by formula (C) having a quaternary ammonium salt on the side chain, a structure (D) having a carboxy group, and a structure (E) having an aromatic ring, regulated so that the base number thereof may be 5-70 mmol/100 g, the acid value is 50-120 mgKOH/g, and the polystyrene-converted weight-average molecular weight measured by gel permeation chromatography is 5,000-30,000. |
