Patent ID: 7166394

Claim:
A pigment dispersion composition for a color filter comprising at least a chromatic organic pigment, a pigment dispersing agent, a binder resin, a reactive compound, and a solvent, wherein the binder resin is a compound having a pigment adsorbing block containing a pigment adsorbing group and not containing a reactive group, and a reactive block containing a reactive group and not containing a pigment adsorbing group, wherein the pigment adsorbing block is a trunk polymer with the pigment adsorbing group being at least one selected from the group consisting of a carboxy methyl group, a sulfonic group, a sulfuric acid group, a phosphonic acid group, a phosphoric acid group, an amino group, and a group containing an aromatic ring, and the reactive block is a branch polymer with a molecular weight in a range from 3,000 to 20,000, having at least a reactive group in a 3,000 to 20,000 molecular weight range from the bonding point with the pigment adsorbing block, and the average particle size of the chromatic organic pigment is 0.15 μm or less.