| 摘要 |
PURPOSE:To prepare the titled resin having high impact resistance, high heat distortion resistance and low thermal discoloration, by polymerizing a monomer composition composed of acrylonitrile, styrene and alpha-methylstyrene in the presence of a diene rubber using a specific process. CONSTITUTION:The objective resin can be prepared by (1) polymerizing (A) 2-40pts.wt. of a monomer mixture containing acrylonitrile and styrene at a weight ratio of (10-40)/(90-60) in the presence of (B) 5-30pts.wt. of a synthetic diene rubber, (2) adding (C) 50-90pts.wt. of alpha-methylstyrene monomer or a monomer mixture containing >=80wt% alpha-methyl-styrene monomer to the polymer, and (3) adding (D) a monomer mixture containing >=70wt% acrylonitrile slowly to the mixture keeping the weight ratio of alpha-methylstyrene/acrylonitrile to (95-65)/ (10-35)(in C and D) to carry out the polymerization. The amounts of the components are selected to give the total amount of the monomers of 95-70pts.wt. EFFECT:The resin can be prepared advantageously in an industrial scale. |
