Patent ID: 11926718
Assignee: DAINICHISEIKA COLOR & CHEMICALS MFG. CO., LTD.
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  C | IPC C

Claim 0:
1. A method for producing resin beads formed with a resin comprising cellulose, being a method for producing the resin beads, the method comprising:
mixing an oil phase comprising a cellulose ester and an organic solvent that dissolves the cellulose ester and has a solubility to 100 g of water at 25° C. in a range from 0.1 to 50.0 g with an aqueous phase comprising a dispersion stabilizer, thereby preparing a suspension comprising oil droplets comprising the cellulose ester and the organic solvent;
adding water to the suspension, thereby contracting the oil droplets and forming resin particles; and
treating the resin particles under an acidic condition, or an alkaline condition of a pH in a range of 13 or lower, thereby hydrolyzing at least part of ester bonds in the cellulose ester,
wherein the resin beads have a cumulative 50% particle size on a volume basis in a range of 50 μm or smaller,
a degree of sphericity in a range from 0.7 to 1.0,
a degree of surface smoothness in a range from 70 to 100%,
a degree of solidity in a range from 50 to 100%, and
a biodegradation rate for 5 days, as measured in accordance with JIS K6950:2000 (ISO 14851:1999), in a range of 20% or more, and
a content of the cellulose in the resin beads is in a range from 90 to 100% by mass.