AQUEOUS DISPERSION OF FLUORINE-CONTAINING SEED POLYMER PARTICLE AND WATER-BASED PAINT COMPOSITION

PROBLEM TO BE SOLVED: To provide an aqueous dispersion of fluorine-containing seed polymer particles that is excellent in compatibility with a fluorine-containing polymer serving as seed particles, despite a large proportion of an acrylic ester polymer subjected to seed polymerization, and yields a transparent coating film when used as a coating film-forming component in a water-based paint composition.SOLUTION: In the aqueous dispersion of the fluorine-containing seed polymer particles, the fluorine-containing seed polymer particles are obtained by carrying out seed polymerization of a monomer mixture comprising an acrylic ester monomer and a hydrolyzable silyl group-containing vinyl monomer using the fluorine-containing polymer particles comprising at least one fluoroolefin unit as the seed particles. Here, the amount of the acrylic ester monomer unit contained is 40-400 pts.mass based on 100 pts.mass fluorine-containing polymer particles, and the amount of the hydrolyzable silyl group-containing vinyl monomer unit contained is 0.1-2 pts.mass based on 100 pts.mass acrylic ester monomer unit. The water-based paint composition comprises the same.