| 摘要 |
The present disclosure relates to a method for preparing rubber-reinforced graft copolymers and graft copolymers manufactured thereby, and more specifically, to a method for preparing a rubber reinforced graft copolymer, in which i) 40-50 wt% of rubber latex having an average particle size of 0.25-0.45 μm and a gel content of 80-95 wt%; ii) 10-20 wt% of rubber latex having an average particle size of 0.09-0.13 μm and a gel content of 85-99 wt%; iii) 20-35 wt% of α-methyl styrene; and iv) 5-20 wt% of a vinyl cyanide monomer are emulsification-polymerized using polymerization water, an emulsifying agent, a molecular weight regulator, an initiator, and an activating agent, wherein the entire quantity of rubber latex of i) and ii) are fed in before polymerization initiation, and the vinyl cyanide monomer of iv) is not or only partially fed in before polymerization initiation, and then the remainder is fed after the polymerization initiation, and to a rubber reinforced graft copolymer prepared thereby. According to the present disclosure, provided are an α-methyl styrene based rubber reinforced graft copolymer capable of improving heat resistance as well as polymerizing productivity and a rubber reinforced graft copolymer prepared thereby. |
