	US 12,460,101 B2
	Method for manufacturing vinyl chloride-vinyl acetate copolymer latex
Eun Soo Jeong, Daejeon (KR); Geun Chang Ryu, Daejeon (KR); and Chulwoong Lee, Daejeon (KR)
Assigned to HANWHA SOLUTIONS CORPORATION, Seoul (KR)
Appl. No. 17/762,109
Filed by HANWHA SOLUTIONS CORPORATION, Seoul (KR)
PCT Filed Jul. 17, 2020, PCT No. PCT/KR2020/009425 § 371(c)(1), (2) Date Mar. 21, 2022, PCT Pub. No. WO2021/054593, PCT Pub. Date Mar. 25, 2021.
Claims priority of application No. 10-2019-0115256 (KR), filed on Sep. 19, 2019.
Prior Publication US 2022/0348784 A1, Nov. 3, 2022
Int. Cl. C09D 127/06 (2006.01); C08F 214/06 (2006.01); C09D 5/02 (2006.01)

CPC C09D 127/06 (2013.01) [C08F 214/06 (2013.01); C09D 5/022 (2013.01); C08F 2800/20 (2013.01)]

11 Claims

1. A method of preparing a vinyl chloride-vinyl acetate copolymer latex, the method comprising the steps of:

preparing a polymerization reaction by feeding an aqueous dispersion medium, an emulsifier, and a vinyl acetate monomer and a vinyl chloride monomer to a reactor;

initiating the polymerization reaction by feeding an initiator to the prepared reactor; and

continuously further feeding the vinyl chloride monomer and the emulsifier to the reactor, in which the polymerization reaction is initiated, respectively, and

wherein 20% by weight to 30% by weight of the total amount (100% by weight) of the vinyl chloride monomer to be reacted is fed in a batch mode in the preparation step before initiation of the polymerization reaction, and the remainder is continuously fed while increasing the feeding amount per hour after initiation of the polymerization reaction.