# US 2023/0265232 A1 · Poly(lactic acid-b-3-hydroxypropionic acid) block copolymer having excellent transparency property and products containing the same

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- Number: US 2023/0265232 A1
- Document ID: US20230265232A1
- Status: Published application
- Kind: A1
- Application number: 18/020,519
- Filed: 2022-02-24
- Published: 2023-08-24
- Earliest claimed: 2021-02-24
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Jung Yun CHOI; Yeonju LEE; Solyi PARK; Chul Woong KIM; Donggyun KANG
- Web page: https://patentgrep.com/patent/US20230265232A1

## CPC

- C08F 293/00: Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule (on to polymers modified by introduction of unsaturated end groups C08F290/02)
- C08G 63/06: derived from hydroxycarboxylic acids
- C08G 63/08: Lactones or lactides
- Y02W 90/10: Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

Provided is a poly(lactic acid-b-3-hydroxypropionic acid) block copolymer in which transparency is improved by introducing a 3-hydroxypropionic acid-derived monomer into a polylactic acid, and thus its application field can be expanded.

## Claims

### Claim 1

A poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of the following Chemical Formula 1, wherein UV transparency of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 80% or more:
wherein in Chemical Formula 1:
m is an integer of 100 to 1000; and
n is an integer of 500 to 4000.

### Claim 2 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein m is 120 to 350.

### Claim 3 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein n is 1000 to 2500.

### Claim 4 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein m/n is 0.05 to 0.20.

### Claim 5 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein elongation of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 1% to 250%.

### Claim 6 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein elongation of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 5% to 35%.

### Claim 7 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein tensile strength of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 30 MPa to 60 MPa.

### Claim 8 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein tensile modulus of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 1.5 GPa to 2.5 GPa.

### Claim 9 (depends on 1)

The poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1, wherein a weight average molecular weight of the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer is 50,000 to 350,000.

### Claim 10 (depends on 1)

An article, comprising the poly(lactic acid-b-3-hydroxypropionic acid) block copolymer of claim 1.