| abstract |
Provided are: a method for producing microparticles of a polylactic acid-based resin; porous microparticles of a polylactic acid-based resin, said microparticles having a small particle diameter, showing a high oil absorption ability and being appropriately usable for cosmetics; smooth-surfaced microparticles of a polylactic acid-based resin, said microparticles having a spherical form, showing a narrow particle diameter distribution and being appropriately usable for toners; and a cosmetic using the aforesaid microparticles of a polylactic acid-based resin. The method for producing microparticles of a polylactic acid-based resin comprises: dissolving a polylactic acid-based resin (A) and a polymer (B), which is different from polylactic acid-based resins, in an ether-type organic solvent (C); applying a shear force thereto to form an emulsion; and then contacting the emulsion with a poor solvent of the polylactic acid-based resin (A). According to this production method, porous microparticles of the polylactic acid-based resin, said microparticles having a fusion enthalpy of the polylactic acid-based resin (A) of 5 J/g or greater, having a small particle diameter and showing a high oil absorption ability, and smooth-surfaced microparticles of the polylactic acid-based resin, said microparticles having a fusion enthalpy less than 5 J/g, having a spherical form and showing a narrow particle diameter distribution, can be provided. |