METHOD FOR PREPARING RUBBER REINFORCED GRAFT COPOLYMER AND RUBBER REINFORCED GRAFT COPOLYMER PREPARED THEREBY

摘要

Disclosed are a method of preparing a rubber-reinforced graft copolymer and a rubber-reinforced graft copolymer prepared using the method. According to the present disclosure, provided are a method of preparing an α-methylstyrene-based rubber-reinforced graft copolymer which may enhance polymerization productivity and heat resistance, and a rubber-reinforced graft copolymer prepared using the method.

主权项

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 80 to 95% by weight; (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 of; (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.