Poly(3-hydroxybutyrate)-based resin tube and method for producing same

Patent metadata

Field	Value
Publication number	US-2023145613-A1
Application number	US-202117907518-A
Country	US
Kind code	A1
Filing date	Apr 9, 2021
Priority date	Apr 17, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

It is an object of an embodiment of the present invention to provide: a poly(3-hydroxybutyrate)-based resin tube which exhibits excellent resistance to repeated bending; and a method for producing the poly(3-hydroxybutyrate)-based resin tube. The object is attained by providing a poly(3-hydroxybutyrate)-based resin tube which contains 95 wt % to 60 wt % of a poly(3-hydroxybutyrate)-based resin and 5 wt % to 40 wt % of an aliphatic-aromatic polyester-based resin and has an elongation at yield point in a tensile test, a tensile elongation of not less than 50% in the tensile test, and a thickness of 0.01 mm to 0.6 mm.

First claim

1 : A poly(3-hydroxybutyrate)-based resin tube, comprising:
95 wt % to 60 wt % of a poly(3-hydroxybutyrate)-based resin; and 5 wt % to 40 wt % of an aliphatic-aromatic polyester-based resin, wherein the poly(3-hydroxybutyrate)-based resin tube has an elongation at yield point in a tensile test and exhibits a tensile elongation of not less than 50% in the tensile test, and the poly(3-hydroxybutyrate)-based resin tube has a thickness of 0.01 mm to 0.6 mm.

2 : The poly(3-hydroxybutyrate)-based resin tube of claim 1 , wherein:
the aliphatic-aromatic polyester-based resin includes a repeating unit derived from an aliphatic dicarboxylic acid, a repeating unit derived from an aromatic dicarboxylic acid, and a repeating unit derived from a diol; the aliphatic dicarboxylic acid is at least one selected from the group consisting of succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid, pimelic acid, suberic acid, fumaric acid, and itaconic acid; the aromatic dicarboxylic acid is at least one selected from the group consisting of terephthalic acid, isophthalic acid, and frandicarboxylic acid; and the diol is at least one selected from the group consisting of 1,2-ethanediol, 1,3-propanediol, and 1,4-butanediol.

3 : The poly(3-hydroxybutyrate)-based resin tube of claim 1 , wherein a crystal melting curve of a mixture of the poly(3-hydroxybutyrate)-based resin and the aliphatic-aromatic polyester-based resin in differential scanning calorimetry is such that a difference between a top temperature (Tm a ) of the crystal melting curve within a range of 130° C. to 155° C. and an end temperature (Tm b ) of the crystal melting curve is not less than 10° C.

4 : The poly(3-hydroxybutyrate)-based resin tube of claim 1 , wherein the poly(3-hydroxybutyrate)-based resin is poly(3-hydroxybutyrate-co-3-hydroxyhexanoate).

5 : A method for producing a poly(3-hydroxybutyrate)-based resin tube of claim 1 , comprising:
melting a mixture of the poly(3-hydroxybutyrate)-based resin and the aliphatic-aromatic polyester-based resin in an extruder; and then extruding the mixture through an annular die into water, wherein the annular die has a temperature set between a top temperature (Tm a ) of a crystal melting curve in differential scanning calorimetry of the mixture and an end temperature (Tm b ) of the crystal melting curve.

6 : A method for producing a poly(3-hydroxybutyrate)-based resin tube of claim 1 , comprising:
shaping the poly(3-hydroxybutyrate)-based resin tube at room temperature.

Assignees

• Kaneka Corp

Inventors

• Hashiguchi Tomoaki
• Okura Tetsuo

Classifications

• F16L11/04 Primary

  made of rubber or flexible plastics · CPC title

• B29L2023/008

  Drinking straws · CPC title

• B29C48/919

  using a bath, e.g. extruding into an open bath to coagulate or cool the material · CPC title

• B29K2067/04

  Polyesters derived from hydroxycarboxylic acids · CPC title

• B29K2995/006

  Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible · CPC title