Preparation Method for Ethylene-Vinyl Alcohol Copolymer

    公开(公告)号:US20240360252A1

    公开(公告)日:2024-10-31

    申请号:US18028856

    申请日:2022-06-30

    申请人: LG Chem, Ltd.

    IPC分类号: C08F8/12

    CPC分类号: C08F8/12 C08F2810/50

    摘要: This invention relates to a-A method for preparing ethylene-vinyl alcohol copolymer capable of obtaining ethylene-vinyl alcohol copolymer of high saponification degree, while minimizing the amount of alkali catalysts used is disclosed herein. The method comprises adding a first alkali catalyst solution dropwise to ethylene-vinyl acetate copolymer dispersed in an alcohol solvent, and adding a second alkali catalyst solution dropwise to the first saponification reaction mixture.

    Block copolymer structure and the preparing method thereof

    公开(公告)号:US11667744B2

    公开(公告)日:2023-06-06

    申请号:US17693898

    申请日:2022-03-14

    发明人: Chi-How Peng

    IPC分类号: C08F8/12 C08F293/00

    CPC分类号: C08F293/005 C08F8/12

    摘要: A block copolymer having the general formula as formula (1): mediator-P2-P1-X, formula (1), and the chemical structural formula is




    formula (2), in which the mediator in formula (1) and formula (2) is a regulator, which is a conjugated seven-membered ring structure, P1 is a first polymer which may be a conjugated or non-conjugated olefin monomer, R1 is the functional group of P1, n is the number of the monomer of P1, which is a positive integer and the range is 10˜1,500. P2 is a second polymer, m is the number of the monomer of P2, which is a positive integer and the range is 10˜1,500, and X is the end-functional group of the block copolymer.