METHOD OF MANUFACTURING RUBBER MODIFIED STYRENE RESINS

摘要

A method of manufacturing rubber modified styrene resins comprising the 1st step of polymerizing a styrene monomer in the presence of a butadiene polymer and an orgainc peroxide at the ratio of 100 parts by weight, 3 to 15 parts by weight and 0 to 0.01 parts by weight respectively until the polymerization yield of the styrene monomer becomes 2 to 5 times more than the weight of the butadiene polymer, and the 2nd step of polymerizing the full amount of polymer mixture from the 1st step and 0 to 200 parts by weight of the fresh styrene monomer in the presence of 0.01 to 0.9 parts by weight of the organic peroxide until the polymerization yield of the styrene monomer becomes 1.5 times more than that of the 1st step. The molded product of the resin thus obtained shows an improved impact strength at the portions where polystyrene molecule orientation tends to occur.