Patent ID: 9663606
Date: 2017-05-30
CPC Classifications: C08F,C08L

Claim:
1. A method of preparing a rubber-reinforced graft copolymer, wherein (i) 40 to 50% by weight of rubber latex having an average particle size of 0.25 to 0.45 μm and a gel content of 85 to 95% by weight, based on a solid content; (ii) 10 to 20% by weight of rubber latex having an average particle size of 0.09 to 0.13 μm and a gel content of 85 to 99% by weight, based on a solid content; (iii) 20 to 35% by weight of α-methylstyrene; and (iv) 5 to 20% by weight of a vinyl cyan monomer are emulsion-polymerized using water, an emulsifier, a molecular weight regulator, an initiator and an activator, wherein a total amount of the rubber latex of (i) and (ii) is input before initiation of polymerization, and the vinyl cyan monomer of (iv) is not input before initiation of polymerization, or the vinyl cyan monomer of (iv) is partially input before initiation of polymerization and then a remainder thereof is input after initiation of polymerization, wherein the molecular weight regulator is input after initiation of polymerization, wherein the emulsifier comprises a potassium salt of a fatty acid, and wherein the initiator comprises a lipid-soluble redox initiator.