TW254958B - A styrenic resin composition used for extrusion formation - Google Patents

Abstract

A styrenic resin composition used for extrusion formation, which is characterized in comprising: 100 wt% of total poystyrenic resin which is comprised of 15~100 wt% of polystyrenic graft copolymer (A) and 85~0 wt% of polystyrenic polymer (B), 0.01~3.0 wt% of 2,2'-oxamido bis-[ethyl-3-(3,5-Di- Tert-butyl-4-hydroxyphenyl)propionate], in which the graft polystyrenic polymer comprising the polystyrenic graft copolymer (A) and the monomer comprising polystyrenic polymer (B) are all comprised of 50~90 wt% of styrene, 50~10 wt% of rigid propenyl group which is comprised of acrylonitrile and/or methyl methacrylate and 0~30 wt% of other ethylenyl group monomer, and the polystyrenic graft copolymer (A) comprises: styrenic graft copolymer (G1), which is polymerized by bulk or solution polymerization method to form rubber granules which contains 5~30 wt% of rubber polymers and the average rubber particle size is 0.5~5.0 熤; styrenic graft copolymer (G2), which is polymerized by emulsion polymeri zation method and contains 35~85 wt% of rubber-like polymers which has average rubber particle size of 0.05~0.4 熤; in which the rubber-like polymer of (G1) is 3~80 wt% of the total rubber-like polymer and the total amount of rubber-like polymer contained in the total polystyrenic resin is 4~30 wt%.