US 12,134,217 B2
Method for producing injection-molded body
Yuta Katsuta, Settsu (JP); Nobuo Nakamura, Settsu (JP); and Shunsuke Sato, Takasago (JP)
Assigned to KANEKA CORPORATION, Osaka (JP)
Appl. No. 17/627,428
Filed by KANEKA CORPORATION, Osaka (JP)
PCT Filed Jun. 8, 2020, PCT No. PCT/JP2020/022526
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/010054, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 2019-131277 (JP), filed on Jul. 16, 2019.
Prior Publication US 2022/0258387 A1, Aug. 18, 2022
Int. Cl. B29C 45/00 (2006.01); C08G 63/06 (2006.01); C08K 3/34 (2006.01); B29C 45/72 (2006.01); B29K 105/00 (2006.01); B29K 509/02 (2006.01)
CPC B29C 45/0013 (2013.01) [C08G 63/06 (2013.01); C08K 3/346 (2013.01); B29C 45/7207 (2013.01); B29K 2105/0085 (2013.01); B29K 2509/02 (2013.01)] 17 Claims
 
1. A method for producing an injection-molded body from a molding material comprising a poly(3-hydroxybutyrate) resin, the method comprising:
melting the molding material by heating the molding material to a temperature (A) between a melting point peak temperature and a melting point peak end temperature in differential scanning calorimetry analysis of the molding material, wherein the temperature (A) is an actual temperature of the molding material during melting, and a difference between the melting point peak temperature and the melting point peak end temperature of the molding material is from 10 to 70° C.;
injecting the molten molding material into a mold having a temperature of from 30 to 80° C.; and
cooling the molding material in the mold to crystallize and solidify the molding material,
wherein the molding material does not contain a crystal nucleating agent consisting of pentaerythritol.