Biodegradable polyester and use thereof

Patent metadata

Field	Value
Publication number	US-11149113-B2
Application number	US-201816644505-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Oct 26, 2017
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A biodegradable polyester and use thereof includes components: A) acid components containing following repeating units: 40 to 48 mol % of terephthalic acid A1; 38.5 to 50 mol % of sebacic acid A2; and 2 to 20 mol % of an aliphatic dibasic acid A3 with a carbon chain length of 6 or less; B) butanediol. In the case of low content of the terephthalic acid unit, by introducing the aliphatic dibasic acid unit with the carbon chain length of 6 or less, mechanical properties of the material can be significantly improved, and the mechanical property retention is better especially when stored in a humid environment.

First claim

What is claimed is:

1. A biodegradable polyester, comprising components as follows in mole percent:
A) acid components containing following repeating units:
46 to 47.5 mol % of terephthalic acid A1;
45.5 to 50 mol % of sebacic acid A2; and
2.5 to 7 mol % of an aliphatic dibasic acid A3 with a carbon chain length of 6 or less; and

B) butanediol.

2. The biodegradable polyester according to claim 1 , wherein the aliphatic dibasic acid A3 with the carbon chain length of 6 or less is one of or a mixture of two or more of adipic acid, glutaric acid and succinic acid.

3. The biodegradable polyester according to claim 1 , wherein the biodegradable polyester is made into a film of 25±1 μm, the film is processed at 40° C. and 85% relative humidity for one month, and a tensile property retention rate of the film tested by using ISO 527 standard is 65% or above.

4. A biodegradable polyester blend comprising the biodegradable polyester according to claim 1 .

5. A preparation method of various film materials, comprising using the biodegradable polyester according to claim 1 .

6. The preparation method of the various film materials according to claim 5 , wherein the various film materials are biodegradable bags, mulching films, plastic wraps, or courier bags.

7. A biodegradable polyester blend comprising the biodegradable polyester according to claim 2 .

8. A biodegradable polyester blend comprising the biodegradable polyester according to claim 3 .

9. A preparation method of various film materials, comprising using the biodegradable polyester blend according to claim 4 .

10. The preparation method of the various film materials according to claim 9 , wherein the various film materials are biodegradable bags, mulching films, plastic wraps, or courier bags.

Assignees

• Kingfa Science & Technology Co

Inventors

• Wang Weiwei
• Yuan Zhimin
• Cai Tongmin
• Huang Xianbo
• Zeng Xiangbin
• Ye Nanbiao
• Guo Zhilong
• Lu Changli

Classifications

• C08G63/183 Primary

  Terephthalic acids · CPC title

• C08J2300/16

  Biodegradable polymers · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08G2230/00

  Compositions for preparing biodegradable polymers · CPC title