	US 12,291,586 B2
	Method of preparing polymer
Sung Won Hong, Daejeon (KR); Hyung Sub Lee, Daejeon (KR); Dae Woo Lee, Daejeon (KR); Min Cheol Ju, Daejeon (KR); Seong Jae Shin, Daejeon (KR); Min Seung Shin, Daejeon (KR); and In Soo Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/783,682
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Nov. 25, 2021, PCT No. PCT/KR2021/017531 § 371(c)(1), (2) Date Jun. 9, 2022, PCT Pub. No. WO2022/114813, PCT Pub. Date Jun. 2, 2022.
Claims priority of application No. 10-2020-0163058 (KR), filed on Nov. 27, 2020; and application No. 10-2021-0163729 (KR), filed on Nov. 24, 2021.
Prior Publication US 2023/0020924 A1, Jan. 19, 2023
Int. Cl. C08F 212/12 (2006.01); C08F 2/18 (2006.01); C08F 212/08 (2006.01); C08F 212/10 (2006.01); C08F 220/44 (2006.01)

CPC C08F 212/12 (2013.01) [C08F 2/18 (2013.01); C08F 212/08 (2013.01); C08F 212/10 (2013.01); C08F 220/44 (2013.01)]

10 Claims

1. A method of preparing a polymer, comprising:

adding a first reaction solution including an aqueous solvent and a monomer mixture including an alkyl-substituted aromatic vinyl-based monomer, an alkyl-unsubstituted aromatic vinyl-based monomer, and a vinyl cyanide-based monomer to a reactor and initiating polymerization; and

continuously adding the alkyl-substituted aromatic vinyl-based monomer to the reactor to perform the polymerization,

wherein the first reaction solution satisfies the following Expression 1:

50≤(Weight of monomer mixture)/(Weight of first reaction solution)×100≤60. <Expression 1>