US 12,291,591 B2
Method of preparing vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer, and thermoplastic resin composition including graft copolymer
Yoo Vin Kim, Daejeon (KR); Jae Min Suk, Daejeon (KR); Young Hwan Jeong, Daejeon (KR); and Changhong Park, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/299,218
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Aug. 3, 2020, PCT No. PCT/KR2020/010185
§ 371(c)(1), (2) Date Jun. 2, 2021,
PCT Pub. No. WO2021/033953, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 10-2019-0100526 (KR), filed on Aug. 16, 2019.
Prior Publication US 2022/0049038 A1, Feb. 17, 2022
Int. Cl. C08F 279/04 (2006.01); C08F 2/24 (2006.01); C08F 6/22 (2006.01); C08L 55/02 (2006.01)
CPC C08F 279/04 (2013.01) [C08F 2/24 (2013.01); C08F 6/22 (2013.01); C08L 55/02 (2013.01)] 13 Claims
 
1. A method of preparing a vinyl cyanide compound-conjugated diene compound-aromatic vinyl compound graft copolymer, the method comprising:
preparing graft copolymer latex by graft-polymerizing 20 to 40% by weight of an aromatic vinyl compound and 1 to 20% by weight of a vinyl cyanide compound onto 50 to 70% by weight of conjugated diene rubber latex having a solids content of 30 to 65% by weight; and
coagulating and aging the prepared graft copolymer latex by adding 0.04 to 0.27 parts by weight of a nonionic polymer coagulant as a first coagulant, and 0.47 to 1.65 parts by weight of a cationic polymer coagulant or 0.73 to 3.35 parts by weight of an anionic polymer coagulant as a second coagulant to 100 parts by weight (based on solids) of the prepared graft copolymer latex,
wherein, when the second coagulant is the cationic polymer coagulant, a total weight of the nonionic polymer coagulant and the cationic polymer coagulant is 0.7 to 1.7 parts by weight, and when the second coagulant is the anionic polymer coagulant, a total weight of the nonionic polymer coagulant and the anionic polymer coagulant is 0.97 to 3.37 parts by weight.