Patent ID: 11859058
Assignee: DAICEL-EVONIK LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for producing resin particles comprising:
melt-kneading a water-soluble matrix, containing a water-soluble polyvinyl alcohol-based resin and a non-water-soluble resin to form a pre-molded article in which the non-water-soluble resin is dispersed in particulate form in the water-soluble matrix; and
bringing the pre-molded article into contact with an aqueous solvent to elute the water-soluble matrix away from the pre-molded article so as to produce the resin particles, wherein the water-soluble polyvinyl alcohol-based resin comprises a modified polyvinyl alcohol-based resin comprising a side chain comprising an alkyl group or alkyl chain, the alkyl group or alkyl chain comprising at least one hydroxyl group,
wherein the resin particles are produced by a method (A) and a method (B) below:
(A) the melt-kneading is conducted at a temperature above 220° C. to form the pre-molded article;
(B) the resin particles having a volume-average particle size (D50) of greater than 5 μm are produced,
wherein a weight ratio of the non-water-soluble resin and the modified polyvinyl alcohol-based resin is the former/the latter=from 30/70 to 50/50,
wherein the non-water-soluble resin comprises a polyamide resin, and
wherein the pre-molded article is in form of pellets.