| abstract |
Production method of polylactic acid-based resin fine particles, porous particles with a small particle size and high oil absorption suitable for cosmetics use, and porous polylactic acid resin fine particles suitable for toners, true spheres suitable for toner and smooth surface-smooth polylactic acid -Based resin fine particles and cosmetics using these polylactic acid-based resin fine particles are provided. A polylactic acid resin (A) and a polymer (B) different from the polylactic acid resin are dissolved in an ether organic solvent (C), and an emulsion is formed by applying a shearing force. The manufacturing method of the polylactic acid-type resin fine particle which makes a poor solvent contact. By this production method, the polylactic acid resin (A) has a melting enthalpy of 5 J / g or more, a porous polylactic acid resin fine particle having a small particle diameter and a high oil absorption, and a melting enthalpy of less than 5 J / g. It becomes possible to provide polylactic acid-based resin fine particles having a smooth surface with a sphere and a narrow particle size distribution. |