US 12,221,538 B2
Poly(3-hydroxybutyrate) resin tube and method for producing same
Tetsuo Okura, Settsu (JP)
Assigned to KANEKA CORPORATION, Osaka (JP)
Appl. No. 17/266,676
Filed by KANEKA CORPORATION, Osaka (JP)
PCT Filed Aug. 19, 2019, PCT No. PCT/JP2019/032298
§ 371(c)(1), (2) Date Feb. 8, 2021,
PCT Pub. No. WO2020/040093, PCT Pub. Date Feb. 27, 2020.
Claims priority of application No. 2018-154019 (JP), filed on Aug. 20, 2018.
Prior Publication US 2021/0301127 A1, Sep. 30, 2021
Int. Cl. B29C 48/32 (2019.01); B29C 48/88 (2019.01); C08G 63/78 (2006.01); C08L 67/04 (2006.01)
CPC C08L 67/04 (2013.01) [B29C 48/32 (2019.02); B29C 48/912 (2019.02); C08G 63/78 (2013.01); B29K 2867/04 (2013.01)] 7 Claims
 
1. A method for producing a poly(3-hydroxybutyrate) resin tube comprising a poly(3-hydroxybutyrate) resin, the method comprising:
mixing at least two types of poly(3-hydroxybutyrate) resins to obtain the poly(3-hydroxybutyrate) resin;
melting the obtained poly(3-hydroxybutyrate) resin in an extruder;
extruding the melted poly(3-hydroxybutyrate) resin from an annular die; and
introducing the extruded poly(3-hydroxybutyrate) resin into water,
wherein a temperature of the annular die is set to be between a melting point peak temperature and a melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin,
wherein the tube has a wall thickness of from 0.1 to 0.6 mm, and
wherein a difference between a melting point peak temperature and a melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin is from 10° C. to 30° C.