US 12,415,876 B2
Method for producing vinyl chloride-based polymer
Kwang Jin Lee, Daejeon (KR); Yang Jun Jeon, Daejeon (KR); Jae Hyun Park, Daejeon (KR); and Hyun Kyou Ha, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/606,358
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 7, 2020, PCT No. PCT/KR2020/012064
§ 371(c)(1), (2) Date Oct. 25, 2021,
PCT Pub. No. WO2021/049836, PCT Pub. Date Mar. 18, 2021.
Claims priority of application No. 10-2019-0113003 (KR), filed on Sep. 11, 2019.
Prior Publication US 2022/0227899 A1, Jul. 21, 2022
Int. Cl. C08F 114/06 (2006.01); C08F 2/00 (2006.01); C08F 2/22 (2006.01); C08F 2/26 (2006.01); C08F 2/44 (2006.01); C08K 3/26 (2006.01)
CPC C08F 114/06 (2013.01) [C08F 2/22 (2013.01); C08F 2/26 (2013.01); C08F 2/44 (2013.01); C08K 3/26 (2013.01); C08F 2/00 (2013.01); C08F 2/001 (2013.01); C08K 2003/262 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for producing a vinyl chloride-based polymer, the method comprising the steps of:
1) Adding a vinyl chloride-based monomer into a reactor to initiate polymerization;
2) Continuously adding a first emulsifier to the reactor from a polymerization initiation time to a time when a polymerization conversion rate reaches a range of 35% to 52%; and
3) Continuously adding a second emulsifier after completing the adding of the first emulsifier,
wherein the first emulsifier and the second emulsifier are different from each other, the first emulsifier is a succinate compound, and the second emulsifier comprises a sulfate compound,
the first emulsifier and the second emulsifier are added at a weight ratio of 6:4 to 9:1, and
wherein the second emulsifier comprises at least one selected from the group consisting of alkyl ether sulfate, sulfate alkanolamide, monoglyceride sulfate, glycerol ether sulfate, fatty acid ether sulfate, and fatty acid amide ether sulfate.