PRODUCTION OF POLYMER FINE PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method for efficiently producing polymer fine particles having a controlled particle diameter distribution and a standard deviation by a ready operation. SOLUTION: In this method for obtaining polymer fine particles by mixing seed polymer particles dispersed into an aqueous dispersion medium with a water dispersion of an oil-soluble ethylenic unsaturated monomer, absorbing the oil-soluble ethylenic unsaturated monomer in the seed polymer particles and polymerizing the monomer in the presence of an oil-soluble polymerization initiator, the mixing of the seed polymer particles dispersed in the aqueous dispersion medium and the water dispersion of the oil-soluble ethylenic unsaturated monomer is carried out by adding the seed polymer particles dispersed in the aqueous dispersion to the water dispersion stepwise or continuously.