Patent ID: 11958922
Assignee: SEKISUI PLASTICS CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 9:
10. A method for producing the vinyl-based resin particles according to claim 1, the method comprising:
a seed polymerization step of performing seed polymerization by absorbing a first polymerizable vinylic monomer into seed particles to obtain an aqueous dispersion containing polymer particles of the first polymerizable vinylic monomer and an aqueous medium;
a spray-drying step of spray-drying the aqueous dispersion obtained in the seed polymerization step at an inlet temperature of 80 to 220° C. and an outlet temperature of 50 to 100° C. to obtain an aggregate; and
a crushing step of crushing the aggregate obtained in the spray-drying step to obtain vinyl-based resin particles,
wherein in the seed polymerization step, the first polymerizable vinylic monomer comprises a monofunctional monomer and a polyfunctional monomer, and the first polymerizable vinylic monomer comprises the polyfunctional monomer in an amount of 8 to 150 parts by mass based on 100 parts by mass of the monofunctional monomer.