DLA Piper LLP (US)
Process of producing polylactic acid-based resin microparticles, polylactic acid-based resin microparticles and cosmetics
A process of producing polylactic acid-based resin microparticles includes a dissolving process that forms a system, which can cause phase separation into two phases of a solution phase mainly composed of polylactic acid-based resin (A) and a solution phase mainly composed of polymer (B) different from polylactic acid-based resin, by dissolving the polylactic acid-based resin (A) and the polymer (B) different from polylactic acid-based resin in an ether-based organic solvent (C), an emulsion-forming process that forms an emulsion by applying a shear force to the system, and a microparticle-forming process that precipitates polylactic acid-based resin microparticles by contacting the emulsion with a poor solvent which has lower solubility of the polylactic acid-based resin (A) than the ether-based organic solvent (C).
Toray Industries, Inc.
C G A G C A G G A Y C G C C A A A G C
C08G G03G A61Q G03G C08J A61K G03G G03G A61K Y10T C08J G03G C08G C08J A61K A61K A61Q G03G C08J
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Hiroshi Itaru Hiroshi Makiko
Kobayashi Asano Takezaki Saito