FLAME-RETARDANT POLYSTYRENIC RESIN COMPOSITION AND MOLDINGS OF POLYSTYRENIC RESIN

摘要

A flame-retardant polystyrenic resin composition excellent in heat stability, which is improved in flame retardance and so on and is reduced in the amount of the gas generating in the thermoforming or hot processing and the amount of mold deposits without impairing the excellent heat resistance, chemical resistance, mechanical strengths and so on inherent in SPS and which can give moldings little suffering from discoloration or change in mechanical strength. The composition comprises (A) 100 parts by weight of a resin comprising (a-1) a styrenic polymer having a syndiotactic structure, (a-2) a polymer having a polar group and exhibiting compatibility or affinity for the component (a-1), and (a-3) a thermoplastic resin and/or a rubbery elastomer, (B) 2 to 100 parts by weight of a bromodiphenyl compound, and (C) antimony oxide or the like, the (B) to (C) weight ratio being within the range of 1 to 10, and another resin composition comprises the above composition and an inorganic filler.