METHOD FOR PRODUCING SINGLE-HOLE HOLLOW POLYMER MICROPARTICLES

摘要

The present invention provides a method for producing single-hole hollow polymer particles having extremely uniform outer diameters and inner diameters with no need for classification operation. Further, the present invention provides single-hole hollow polymer particles produced by the method for producing single-hole hollow polymer particles. The present invention provides a method for producing single-hole hollow polymer particles including the steps of preparing a dispersion of swollen particle droplets by mixing a seed particle dispersion obtained by dispersing seed particles containing a non-crosslinked polymer in a water-containing dispersion medium with an oil-soluble solvent and thereby making the seed particles absorb the oil-soluble solvent; preparing a mixed solution by mixing the dispersion of the swollen particle droplets with an aqueous solution containing a water-soluble polymer; and precipitating the water-soluble polymer on the surfaces of the swollen particle droplets by carrying out operation for lowering the solubility of the water-soluble polymer in the mixed solution.