METHOD FOR PRODUCING MICROPARTICLES OF POLYLACTIC ACID-BASED RESIN, MICROPARTICLES OF POLYLACTIC ACID-BASED RESIN AND COSMETIC USING SAME
申请人:Toray Industries, Inc.
公开号:EP2660272A1
公开(公告)日:2013-11-06
Disclosed 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 cosmetics using the aforementioned microparticles of a polylactic acid-based resin. The process 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-based organic solvent (C); applying a shear force thereto to form an emulsion; and bringing the emulsion into contact with a poor solvent of the polylactic acid-based resin (A). According to this production process, it becomes possible to provide 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 to provide smooth-surfaced microparticles of the polylactic acid-based resin, said microparticles having a fusion enthalpy of less than 5 J/g, having a spherical form and showing a narrow particle diameter distribution.
本发明公开了一种生产聚乳酸基树脂微粒的方法;一种聚乳酸基树脂多孔微粒(所述微粒的颗粒直径小,吸油能力强,适合用于化妆品);一种聚乳酸基树脂光滑表面微粒(所述微粒呈球形,颗粒直径分布窄,适合用于爽肤水);以及使用上述聚乳酸基树脂微粒的化妆品。生产聚乳酸基树脂微粒的工艺包括:将聚乳酸基树脂(A)和不同于聚乳酸基树脂的聚合物(B)溶解在醚基有机溶剂(C)中;对其施加剪切力以形成乳液;并使乳液与聚乳酸基树脂(A)的贫溶剂接触。根据该生产工艺,可以提供多孔的聚乳酸基树脂微粒,所述微粒的聚乳酸基树脂(A)熔焓大于或等于 5 J/g,颗粒直径小,吸油能力强;还可以提供表面光滑的聚乳酸基树脂微粒,所述微粒的熔焓小于 5 J/g,呈球形,颗粒直径分布窄。