Patent ID: 7358281
Filing Date: 2008-04-15
Classification: C08F,C09D

Abstract:
1. A process for producing a hollow polymer particle; comprising emulsion-polymerizing 100 parts by mass of a non-crosslinkable monomer in the presence of 0.01 to 5 parts by mass of a chain transfer agent composed of at least one compound selected from the group consisting of α-methylstyrene dimer, thiuram disulfides and terpene hydrocarbons to obtain a seed particle which is a particle of a polymer having a weight average molecular weight of 500 to 15,000; and adding a crosslinkable polymerizable monomer composition comprising a crosslinkable monomer component and a hydrophilic monomer component to an aqueous dispersion of the seed particle to subject the monomer composition to an emulsion polymerization treatment in a state absorbed in the seed particle.