| 摘要 |
PURPOSE: A flame retardant rubber-reinforced polystyrene resin composition is provided, which is free from a halogen-based flame retardant, and is improved in the stability against fire, the environmental stability, the heat resistance, the impact strength and the fluidity. CONSTITUTION: The polystyrene resin composition comprises 70-94.5 wt% of a rubber-reinforced polystyrene resin; 0.5-10 wt% of a polyphenylene ether resin; and 5-20 wt% of a phosphoric acid ester compound comprising 40-80 parts by weight of an oligomer-type phosphoric acid ester compound having a hindered methyl group and 20-60 parts by weight of triphenyl phosphate. Preferably the rubber-reinforced polystyrene resin comprises 70-97 parts by weight of at least one monomer selected from the group consisting of an aromatic monoalkenyl monomer and an alkyl acrylate or methacrylate monomer and 3-30 parts by weight of a rubber selected from the group consisting of a butadiene-based rubber, an isoprene-based rubber, a copolymer of butadiene and styrene and an alkyl acrylate-based rubber, and has a particle size of 0.5-2.0 micrometers. Preferably the oligomer-type phosphoric acid ester compound is represented by the formula I, wherein n is a number average degree of polymerization and is 1-5; X is catechol, resorcinol, hydroquinone or bis phenylene diol of the formula II(wherein Y is an alkylene of C1-C5, an alkylidene of C1-C5, cyclo alkylidene of C5-C6, -S- or -SO2-, and z is 0 or 1). |
