CHEMICAL−RESISTANT POLYSTYRENE RESIN COMPOSITION AND MOLDED ARTICLE

摘要

A polystyrene resin composition comprising (A) 10 to 95 parts by weight of an atactic styrene polymer or a mixture of the polymer with a polyphenylene ether and (B) 90 to 5 parts by weight of a styrene polymer mainly of a syndiotactic structure; and a molded article thereof. The polystyrene resin molding can have excellent chemical resistance when the ingredient (B) in that surface layer of the molding which extends to a depth of 0.5 mm has been regulated so as to have a relative crystallinity of 30% or lower or when the syndiotactic styrene polymer is one having a crystallization temperature (Tc) of 220°C or lower. By incorporating a rubber ingredient which is a block polymer having a styrene content of 70 wt.% or higher, a molding excellent in transparency and chemical resistance can be obtained.