Water-soluble matrix, pre-molded article containing resin particles, and method for producing resin particles
US11066529B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2018 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Aug 22, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2477/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided are: a water-soluble matrix whose melt-kneading temperature can be adjusted according to the melting point or glass transition temperature of a resin; a pre-molded article in which resin particles are dispersed in the water-soluble matrix; and a method for producing resin particles. This production method includes melt-kneading a water-soluble matrix containing a modified polyvinyl alcohol-based resin and a water-soluble saccharide at a weight ratio of the former/the latter=from 99/1 to 50/50 and a thermoplastic resin, and bringing the pre-molded article in which the resin particles are dispersed into contact with an aqueous solvent to elute the matrix. The modified polyvinyl alcohol-based resin contains in a side chain thereof an alkyl group including at least one hydroxyl group (for example, a 1,2-dihydroxyalkyl group).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.