FINE HOLLOY POLYMER PARTICLE AND ITS PRODUCTION

PURPOSE:To obtain fine hollow polymer particles, good in polymerization stability and excellent in shielding properties, gloss, adhesion and film strength by polymerizing a specific monomer component in the presence of specified fine polymer particles in an aqueous medium using a water-soluble polymerization initiator. CONSTITUTION:The objective fine particles are obtained by polymerizing (B) 100 pts.wt. monomer component composed of (iv) 0.1-35wt.% ionic monomer, (v) 65-99.9wt.% nonionic monomer capable of reducing the solubility parameter with a change from the monomer into a polymer during polymerization and (vi) 0-35wt.% nonionic monomer other than the aforementioned component (v) in the presence of (A) 10-300 pts.wt. fine polymer particles prepared by polymerizing monomers composed of (i) 0-35wt.% ionic monomer, (ii) 65-100wt.% nonionic monomer increasing or unchanging the solubility parameter with a change from the monomer into a polymer during the polymerization and (iii) 0-35wt.% nonionic monomer other than the above-mentioned component (ii) in an aqueous medium using a water-soluble polymerization initiator.