Biopolymer composition, preparation method for same and bioplastic using same

Patent metadata

Field	Value
Publication number	US-12104011-B2
Application number	US-202017631057-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	Sep 16, 2019
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

Provided is a biopolymer composition, a preparation method for the same, and a bioplastic using the same, the biopolymer composition comprising at least 83.5 weight % of a copolymer resin of lactic acid (LA) and 3-hydroxypropionate (3HP), an antioxidant, and a lubricant, and the composition having an elongation percentage of at least 90% but not greater than 500%.

First claim

The invention claimed is:

1. A biopolymer composition, comprising:
a copolymer resin of lactic acid (LA) and 3-hydroxypropionate (3HP) in an amount of 83.5% by weight or greater and less than 100% by weight;
an antioxidant; and
a lubricant,
wherein the copolymer resin is a block copolymer of the lactic acid (LA) and the 3-hydroxypropionate (3HP) and a weight ratio of the lactic acid (LA) to the 3-hydroxypropionate (3HP) in the copolymer resin is in a range of 70:30 to 90:10,
wherein elongation of the biopolymer composition is greater than or equal to 90% and less than or equal to 500%, and
each of the antioxidant and the lubricant are present in an amount of 0.1 parts by weight to 0.5 parts by weight with respect to a total 100 parts by weight of the biopolymer composition.

2. The biopolymer composition of claim 1 comprising the copolymer resin of lactic acid (LA) and 3-hydroxypropionate (3HP) in an amount of 99% by weight or greater.

3. The biopolymer composition of claim 1 , which has tensile strength of greater than or equal to 40 MPa and less than or equal to 70 MPa, and tensile modulus of greater than or equal to 2.5 GPa and less than or equal to 5 GPa.

4. The biopolymer composition of claim 1 comprising:
the copolymer resin in an amount greater than or equal to 83.5% by weight and less than or equal to 94.5% by weight, and, further comprising:
a strength reinforcing agent; and
a dispersant,
wherein impact strength is greater than or equal to 100 J/m and less than or equal to 200 J/m.

5. The biopolymer composition of claim 4 , wherein the strength reinforcing agent is selected from among a silicone-based strength reinforcing agent, an acryl-based strength reinforcing agent, a butadiene-based strength reinforcing agent, and a silicone-acryl-based strength reinforcing agent.

6. The biopolymer composition of claim 4 comprising:
the strength reinforcing agent in an amount of 5% by weight to 15% by weight; and
the dispersant in an amount of 0.5% by weight to 1.5% by weight, with respect to total 100% by weight of the biopolymer composition.

7. The biopolymer composition of claim 4 , which has tensile strength of greater than or equal to 40 MPa and less than or equal to 60 MPa, and tensile modulus of greater than or equal to 2.5 GPa and less than or equal to 4.5 GPa.

8. A bioplastic comprising the biopolymer composition of claim 1 .

9. The biopolymer composition of claim 1 , wherein the antioxidant comprises pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4- hydroxyphenyl)propionate).

10. The biopolymer composition of claim 1 , wherein the antioxidant comprises a secondary antioxidant selected from among triphenyl phosphite, tris(nonylphenyl)phosphite, triisodecyl phosphite, bis(2,4-dibutylphenyl)pentaerythritol diphosphite, tris-(2,4-di-tert-butylphenyl)phosphite.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Banseok
• Choi Jung Yun
• Kim Chul Woong
• Heo Sungwoon
• Kim Eungwon
• Kang Donggyun

Classifications

• C08J2367/04

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

• C08J3/203

  Solid polymers with solid and/or liquid additives · CPC title

• B29K2105/06

  containing reinforcements, fillers or inserts · CPC title

• B29K2105/0085

  Copolymers · CPC title

• B29K2096/04

  Block polymers · CPC title