US 12,091,483 B2
Method of preparing graft polymer
Hyung Joon Kim, Daejeon (KR); Geon Soo Kim, Daejeon (KR); Moon Ja Hwang, Daejeon (KR); Hee Jung Jeon, Daejeon (KR); Chang Hoe Kim, Daejeon (KR); and Min Su Chae, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/436,520
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Sep. 7, 2020, PCT No. PCT/KR2020/012068
§ 371(c)(1), (2) Date Sep. 3, 2021,
PCT Pub. No. WO2021/060743, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 10-2019-0117615 (KR), filed on Sep. 24, 2019.
Prior Publication US 2022/0177629 A1, Jun. 9, 2022
Int. Cl. C08F 279/04 (2006.01)
CPC C08F 279/04 (2013.01) 9 Claims
 
1. A method of preparing a graft polymer, comprising:
polymerizing a monomer mixture comprising a carboxylic acid monomer and methyl acrylate, wherein the carboxylic acid monomer is included at 1.5 to 2.5 wt %, and thus preparing an acrylic coagulant having an average particle diameter of 60 to 70 nm;
polymerizing diene-based monomers in the presence of an emulsifier containing a salt of a compound represented by Chemical Formula 1 and thus preparing a first diene-based rubber polymer;
enlarging the first diene-based rubber polymer using the acrylic coagulant and thus preparing a second diene-based rubber polymer; and
graft-polymerizing an aromatic vinyl-based monomer and a vinyl cyanide-based monomer to the second diene-based rubber polymer and thus preparing a graft polymer,

OG Complex Work Unit Chemistry
wherein, in Chemical Formula 1,
X is a C1-C20 tetravalent or higher aliphatic hydrocarbon,
R1 to R4, which are the same or different from each other, are each independently hydrogen, a C1-C20 monovalent aliphatic hydrocarbon, or -L3-COOH,
L1 to L3, which are the same or different from each other, are each independently a direct bond or a C1-C20 divalent aliphatic hydrocarbon, and
l and m, which are the same or different from each other, are each independently 0 to 6.