Porous resin microparticles and manufacturing method for same

Abstract

A manufacturing method for porous resin microparticles comprising steps of: heating a polyester thermoplastic resin having biodegradability to a temperature of 80° C. or higher and 200° C. or lower in a glycol ether solvent to obtain a solution, and cooling the solution to precipitate the polyester thermoplastic resin as porous resin microparticles.

1 - 11 . (canceled) 
     
     
         12 . A manufacturing method for porous resin microparticles comprising steps of:
 heating a polyester thermoplastic resin having biodegradability to a temperature of 80° C. or higher and 200° C. or lower in a glycol ether solvent to obtain a solution, and cooling the solution to precipitate the polyester thermoplastic resin as porous resin microparticles.   
     
     
         13 . A manufacturing method for the porous resin microparticles according to  claim 12 , wherein the polyester thermoplastic resin is at least one kind selected from the group consisting of polylactic acid, polybutylene succinate, polyhydroxyalkanoate, and polycaprolactam. 
     
     
         14 . A manufacturing method for the porous resin microparticles according to  claim 12 , wherein the glycol ether solvent is biodegradable. 
     
     
         15 . A manufacturing method for the porous resin microparticles according to  claim 12 , wherein the glycol ether solvent is at least one kind of a solvent selected from the group consisting of 3-alkoxy-3-methyl-1-butanol and 3-alkoxy-3-methyl-1-butyl acetate. 
     
     
         16 . A manufacturing method for the porous resin microparticles according to  claim 12 , wherein the heating is performed in a range from T−40 to T+40° C., assuming that a melting point of the polyester thermoplastic resin is T° C. 
     
     
         17 . Porous resin microparticles containing polybutylene succinate or polyhydroxyalkanoate as a main component. 
     
     
         18 . Porous resin microparticles according to  claim 17 , wherein a volume average particle diameter (A) determined by a Coulter counter method is 1 to 200 μm of, and a particle size distribution index (volume average particle diameter (A)/number average particle diameter (B)) is 1 to 6. 
     
     
         19 . Porous resin microparticles according to  claim 17 , having plural wrinkles. 
     
     
         20 . Porous resin microparticles according to  claim 17 , having 1.1 to 2.0 of a particle form index (Circle equivalent diameter (C)/number average particle diameter (B)) that is a ratio between a circle equivalent diameter (C) determined by an image analytical method and a number average particle diameter (B) determined by the Coulter counter method. 
     
     
         21 . Porous resin microparticles according to  claim 17 , having 150 to 350 mL/100 g of a linseed oil absorption amount. 
     
     
         22 . Porous resin microparticles according to  claim 17 , wherein a reflected light intensity ratio is 0.886 to 1.013. 
     
     
         23 . Porous resin microparticles according to  claim 17 , using for cosmetics. 
     
     
         24 . Porous resin microparticles according to  claim 17 , using for paints. 
     
     
         25 . Porous resin microparticles according to  claim 17 , using for bone repair materials. 
     
     
         26 . Porous resin microparticles according to  claim 17 , using for scaffold materials for cell regeneration. 
     
     
         27 . A cosmetic material comprising the porous resin microparticles according to  claim 17 . 
     
     
         28 . A coating material comprising the porous resin microparticles according to  claim 17 . 
     
     
         29 . An absorptive and slow-release formulation comprising the porous resin microparticles according to  claim 17 .