Patent ID: 8497319

Claim:
A method of producing a dispersion comprising an acryl-modified cellulose ester derivative (D) dispersed in an aqueous medium in which a hydrophobic acrylic resin (B) and a hydrophilic acrylic resin (C) are grafted onto a cellulose ester derivative (A) in the acryl-modified cellulose ester derivative (D), said method comprising: successively graft polymerizing a radical-polymerizable unsaturated monomer mixture (b) used to synthesize the hydrophobic acrylic resin (B) in the presence of the cellulose ester derivative (A), to form a reaction product and then graft polymerizing a radical-polymerizable unsaturated monomer mixture (c) used to synthesize the hydrophilic acrylic resin (C) in the presence of the reaction product, wherein the cellulose ester derivative (A) does not have radical-polymerizable unsaturated group, the amount of carboxyl group-containing radical-polymerizable unsaturated monomers in the radical-polymerizable unsaturated monomer mixture (b) is less than 5 mass %, and the amount of carboxyl group-containing radical-polymerizable unsaturated monomers in the radical-polymerizable unsaturated monomer mixture (c) is in the range of 5-95 mass %.