US 12,441,827 B2
Method of preparing vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer and method of preparing thermoplastic resin composition including the same
Yu Sung Jung, Daejeon (KR); Joo Byung Chai, Daejeon (KR); Jong Beom Kim, Daejeon (KR); Taeyoung Jeon, Daejeon (KR); and In Seok Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/913,250
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Aug. 19, 2021, PCT No. PCT/KR2021/010994
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2022/085913, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 10-2020-0138217 (KR), filed on Oct. 23, 2020; and application No. 10-2021-0107841 (KR), filed on Aug. 17, 2021.
Prior Publication US 2023/0134396 A1, May 4, 2023
Int. Cl. C08F 279/04 (2006.01); C08F 6/22 (2006.01); C08L 55/02 (2006.01)
CPC C08F 279/04 (2013.01) [C08F 6/22 (2013.01); C08L 55/02 (2013.01); C08L 2201/52 (2013.01); C08L 2205/025 (2013.01); C08L 2205/18 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of preparing a vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer, comprising:
step (a) comprising adding a polymer coagulant to a medium-diameter conjugated diene rubber latex having an average particle diameter of 2,400 to 2,800 Å to enlarge the medium-diameter conjugated diene rubber latex to prepare a large-diameter conjugated diene rubber latex having an average particle diameter of 5,800 to 8,500 Å;
step (b) comprising adding a medium-diameter conjugated diene rubber latex having an average particle diameter of 2,400 to 2,800 Å to the prepared large-diameter conjugated diene rubber latex to prepare a bimodal conjugated diene rubber latex; and
step (c) comprising graft-polymerizing the prepared bimodal conjugated diene rubber latex, an aromatic vinyl compound, and a vinyl cyanide compound to obtain a vinyl cyanide compound-conjugated diene rubber-aromatic vinyl compound graft copolymer.