Copolymer and preparation method thereof
AssigneeLG Chem, Ltd.
InventorsJung Yun Choi, Chul Woong Kim, Yeonju Lee, Suhyun Cho
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Abstract
Provided is a copolymer comprising an irregularly arranged structure of a repeating unit of the following Chemical Formula 1 and a repeating unit of the following Chemical Formula 2, and a repeating unit of the following Chemical Formula 3 present at least at one end of the structure: and is characterized by having an improved elongation and also having a high weight average molecular weight while maintaining intrinsic properties of a polylactic acid. Also provided are methods of preparing the copolymer.
Claims8
A copolymer, comprising a structure of A-B or B-A-B, where:
- A has a random arrangement of a repeating unit of the following Chemical Formula 1 and a repeating unit of the following Chemical Formula 2, and
- B has an arrangement of a repeating unit of the following Chemical Formula 3, wherein B is present at least at one end of the copolymer,
- wherein a total weight of A having the repeating unit of Chemical Formula 1 and the repeating unit of Chemical Formula 2 is 1 wt % to 40 wt % with respect to the total weight of the copolymer A-B or B-A-B:
- wherein the copolymer A-B or B-A-B has a tensile strength of 20 MPa to 50 MPa.
A method of preparing a copolymer comprising an irregularly arranged structure of a repeating unit of the following Chemical Formula 1 and a repeating unit of the following Chemical Formula 2, and
- a repeating unit of the following Chemical Formula 3 present at least at one end of the structure,
- wherein the method comprises the following steps of:
- 1) Preparing an oligomer by polycondensation of 3-hydroxypropionic acid and lactic acid;
- and
- 2) polymerizing the oligomer of the step 1 and a lactide.
Dependencies are inferred from the claim text.