THERMOPLASTIC RESIN COMPOSITION HAVING HEAT RESISTANCE AND IMPACT RESISTANCE

摘要

PURPOSE:The titled resin composition having improved impact resistance without lowering heat resistance, obtained by blending a specific aromatic vinyl monomer- maleic anhydride copolymer with a rubber reinforced styrene type polymer and polyphenylene ether. CONSTITUTION:(A) 25-48.5wt% thermoplastic resin obtained by copolymerizing <=20wt%, preferably 8-15wt% maleic anhydride with >=80wt%, preferably 85-92wt% aromatic vinyl monomer is blended with (B) 25-60wt% rubber reinforced styrene type polymer and (C) 3-25wt% polyphenylene ether in order to make 100wt% total amount of the three components. A graft copolymer of styrene type compound and butadiene having an Izod impact strength 12-20kg-cm/cm and a Vicat softening temperature 82-85 deg.C prepared from a polybutadiene having >=90wt% cis-1,4-structure is preferable as the component B. The component A is preferably obtained by solution polymerization or bulk polymerization.