PURPOSE: To provide the titled compsn. having well-balanced properties between heat resistance and impact strength, by blending two specified kinds of α-methylstyrene copolymers and a rubbery graft copolymer.
CONSTITUTION: A multi-component copolymer obtd. by suspension-polymerizing 30W80wt% α-methylstyrene, 10W50wt% N-substd. maleimide monomer such as N-phenylmaleimide, 5W40wt% vinyl cyanide monomer such as acrylonitrile and 0W40wt% other vinyl monomer such as styrene, and a copolymer obtd. by emulsion-polymerizing 50W90wt% α-methylstyrene, 10W50wt% acrylonitrile and 0W 30wt% other vinyl monomer are used. 10W50pts.wt. said multi-component copolymer, 30W70pts.wt. said copolymer and 10W40pts.wt. rubbery graft copolymer such as ABS resin or MBS resin are blended together in a total amount of 100pts.wt.
TANAKA MASAYUKI
KISHIMOTO AKIHIKO
