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AssigneeToray Industries, Inc.
InventorsHiroshi Takezaki, Hiroshi Kobayashi, Makiko Saito, Itaru Asano
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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).
Polylactic acid-based resin microparticles having a number average particle diameter of 1 to 25.1 μm and a linseed oil absorption of 90 ml/100 g or greater, wherein a molar ratio of monomer units of L-lactic acid and D-lactic acid is 90 mole % or more, and said microparticles have a particle diameter distribution index of 1 to 2.
Polylactic acid-based resin microparticles having a number average particle diameter of 1 to 30 μm, a linseed oil absorption of 100 ml/100 g or greater and a sphericity of 85 or greater, wherein a molar ratio of monomer units of L-lactic acid and D-lactic acid is 90 mole % or more, and said microparticles have a particle diameter distribution index of 1 to 2.
Dependencies are inferred from the claim text.