	US 12,331,144 B2
	Method of preparing maleimide-based copolymer
Min Seung Shin, Daejeon (KR); Min Cheol Ju, Daejeon (KR); Sung Won Hong, Daejeon (KR); In Soo Kim, Daejeon (KR); and Hyung Sub Lee, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/624,561
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Nov. 25, 2020, PCT No. PCT/KR2020/016774 § 371(c)(1), (2) Date Jan. 3, 2022, PCT Pub. No. WO2021/112474, PCT Pub. Date Jun. 10, 2021.
Claims priority of application No. 10-2019-0160503 (KR), filed on Dec. 5, 2019; and application No. 10-2020-0158008 (KR), filed on Nov. 23, 2020.
Prior Publication US 2022/0275127 A1, Sep. 1, 2022
Int. Cl. C08F 222/40 (2006.01); C08F 2/18 (2006.01); C08F 212/08 (2006.01); C08F 220/44 (2006.01)

CPC C08F 222/402 (2020.02) [C08F 2/18 (2013.01); C08F 212/08 (2013.01); C08F 220/44 (2013.01)]

8 Claims

1. A method of preparing a maleimide-based copolymer, comprising:

adding a monomer mixture including an aromatic vinyl-based monomer and a maleimide-based monomer to an aqueous solution consisting of an aqueous solvent and a first vinyl cyanide-based monomer and performing polymerization,

wherein the monomer mixture includes a second vinyl cyanide-based monomer, and

wherein an amount of the first vinyl cyanide-based monomer is 30.0 to 90.0 parts by weight with respect to 100.0 parts by weight of the sum of the first vinyl cyanide-based monomer and the second vinyl cyanide-based monomer.