Method for producing composition for melt processing

Patent metadata

Field	Value
Publication number	US-12240955-B2
Application number	US-202017627356-A
Country	US
Kind code	B2
Filing date	Jul 10, 2020
Priority date	Jul 16, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

A method for producing a poly(3-hydroxybutyrate) resin-containing composition for melt processing includes: heating a material containing a poly(3-hydroxybutyrate) resin to a temperature equal to or higher than a melting point peak temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin and equal to or lower than a melting point peak end temperature in the differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin, wherein the difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is 10° C. or more; and extruding the heated material to obtain a composition for melt processing that has a new crystallization peak at a temperature higher than the melting point peak temperature.

First claim

The invention claimed is:

1. A method for producing a composition for melt processing, the method comprising:
heating a material comprising a poly(3-hydroxybutyrate) resin to a temperature equal to or higher than a melting point peak temperature in differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin and equal to or lower than a melting point peak end temperature in the differential scanning calorimetry analysis of the poly(3-hydroxybutyrate) resin, wherein a difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is at least 10° C.; and
extruding the heated material to obtain a composition for melt processing that has a crystallization peak at a temperature higher than the melting point peak temperature of the poly(3-hydroxybutyrate) resin,
wherein the crystallization peak of the composition obtained in the extruding is from 1° C. to 60° C. above the melting point peak temperature of the poly(3-hydroxybutyrate) resin.

2. The method according to claim 1 , wherein the poly(3-hydroxybutyrate) resin comprises poly(3-hydroxybutyrate-co-3-hydroxyhexanoate).

3. The method according to claim 1 , wherein a temperature of the material during the extruding is 175° C. or lower.

4. The method according to claim 1 , wherein a weight-average molecular weight of the poly(3-hydroxybutyrate) resin is 40×10 4 or less.

5. The method according to claim 1 , wherein the melting point peak temperature of the poly(3-hydroxybutyrate) resin is at least 135° C.

6. A method for producing a poly(3-hydroxybutyrate) resin-containing molded body, the method comprising:
obtaining a composition for melt processing by the method according to claim 1 ; and
subjecting the composition to melt processing to produce a molded body.

7. The method according to claim 2 , wherein a temperature of the material during the extruding is 175° C. or lower.

8. The method according to claim 1 , wherein prior to the heating and the extruding, the material does not have the crystallization peak at the temperature higher than the melting point peak temperature of the poly(3-hydroxybutyrate) resin.

9. The method according to claim 1 , wherein the difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is from 12° C. to 50° C.

10. The method according to claim 1 , wherein the difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is from 18° C. to 50° C.

11. The method according to claim 1 , wherein the difference between the melting point peak temperature and the melting point peak end temperature of the poly(3-hydroxybutyrate) resin is from 25° C. to 50° C.

12. The method according to claim 1 , wherein the melting point peak temperature of the poly(3-hydroxybutyrate) resin is from 135° C. to 160° C.

13. The method according to claim 1 , wherein a weight-average molecular weight of the poly(3-hydroxybutyrate) resin is from 15×10 4 to 30×10 4 or less.

14. The method according to claim 1 , wherein the crystallization peak of the composition obtained in the extruding is from 12° C. to 50° C. above the melting point peak temperature of the poly(3-hydroxybutyrate) resin.

15. The method according to claim 1 , wherein a temperature of the material during the extruding is from 140° C. to 165° C.

16. The method according to claim 1 , wherein a temperature of the material during the extruding is from 150° C. to 160° C.

Assignees

• Kaneka Corp

Inventors

• Fukutome Asuka
• Okura Tetsuo
• Sato Shunsuke

Classifications

• C08J2367/04

  Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2367/06 takes precedence) · CPC title

• C08G2250/00

  Compositions for preparing crystalline polymers · CPC title

• C08G63/06 Primary

  derived from hydroxycarboxylic acids · CPC title

• B29K2096/00

  Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material · CPC title

• B29B11/10

  Extrusion moulding · CPC title