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

Patent metadata

Field	Value
Publication number	US-2021301127-A1
Application number	US-201917266676-A
Country	US
Kind code	A1
Filing date	Aug 19, 2019
Priority date	Aug 20, 2018
Publication date	Sep 30, 2021
Grant date	—

Abstract

Provided is a poly(3-hydroxybutyrate) resin tube including a poly(3-hydroxybutyrate) resin, the tube having a wall thickness of 0.1 to 0.6 mm. The difference between the melting point peak temperature and the melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin is preferably 10° C. or higher. Preferably, production of the tube includes the step of melting a poly(3-hydroxybutyrate) resin in an extruder, then extruding the resin from an annular die, and introducing the resin into water, the annular die temperature being set to a temperature between the melting point peak temperature and the melting point peak end temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin.

First claim

1 . A poly(3-hydroxybutyrate) resin tube, comprising;
a poly(3-hydroxybutyrate) resin, wherein the tube has a wall thickness of 0.1 to 0.6 mm.

2 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , 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 10° C. or higher.

3 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the poly(3-hydroxybutyrate) resin is poly (3-hydroxybutyrate-co-3-hydroxyhexanoate).

4 . A method for producing the poly(3-hydroxybutyrate) resin tube of claim 1 , the method comprising:
melting a 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.

5 . The method according to claim 4 , wherein the poly(3-hydroxybutyrate) resin has a melt viscosity at 160° C. of 10,000 poise or more.

6 . The method according to claim 4 , further comprising:
mixing at least two types of poly(3-hydroxybutyrate) resins.

7 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the poly(3-hydroxybutyrate) resin has a melt viscosity at 160° C. of 10,000 poise or more.

8 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , 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 12° C. or higher and 50° C. or lower.

9 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the tube comprises a plurality of tubes having different diameters connectable with a stopper portion such that the tube is extensible.

10 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the tube has a bellows portion such that the tube is bendable at the bellows portion.

11 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the poly(3-hydroxybutyrate) resin comprises at least two types of poly(3-hydroxybutyrate) resins.

12 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the tube has an outer diameter of from 2 to 10 mm and a length of from 50 to 350 mm.

13 . The poly(3-hydroxybutyrate) resin tube according to claim 1 , wherein the poly(3-hydroxybutyrate) resin has a melt viscosity at 160° C. of 13,000 poise or more and 30,000 poise or less.

Assignees

• Kaneka Corp

Inventors

• Okura Tetsuo

Classifications

• A47G21/186 Primary

  Details of bendable straws · CPC title

• A47G2400/10

  Articles made from a particular material · CPC title

• C08G63/78

  Preparation processes · CPC title

• A47G21/18

  Drinking straws or the like ({as integral parts of drinking containers A47G19/2266;} for therapeutic purposes A61J15/00 {; adapted to emerge from drinking containers when opened B65D77/283}) · CPC title

• C08L67/04 Primary

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title