METHOD OF PREPARING VINYL CHLORIDE RESIN COMPOSITIONS

... 1299400 Graft polymer compositions SHINETSU CHEMICAL CO 29 Dec 1970 [30 Dec 1969] 61660/70 Heading C3G A method of preparing vinyl chloride resin compositions comprises: (1) conducting polymerization in a polymerization vessel, containing an aqueous emulsion and having two inlets, by continuously pouring into the vessel 10-90 parts by weight of a diene rubber polymer, through one of the inlets, and 90-10 parts by weight complementarily of methyl methacrylate and 5-180 parts by weight of styrene through the other inlet, from 20 to 80% of the methyl methacrylate being added first, on its own, and the remainder of the methyl methacrylate being added subsequently mixed with the styrene, (2) recovering the graft polymer thus obtained from the aqueous emulsion, and (3) adding 30-1 parts by weight of the graft polymer with agitation to 70-99 parts by weight of vinyl chloride resin. The diene rubber polymer may be polybutadiene or a butadiene-styrene copolymer prepared by copolymerizing a mixture ...