| abstract |
PURPOSE:A resin which has been prepared by including the chains of alpha-methylstyrene as much as possible so as to avoide becoming longer is combined with ABS resin to give a composition which has high thermal stability and heat resistance and good processability. CONSTITUTION:Polymerization is started using 50-85wt% of alpha-methylstyrene, 3-20wt% of methyl methacrylate and 2-20wt% of acrylonitrile, then in the way of the polymerization, 2-15pts.wt. of acrylonitrile is added continuously or intermittently. After completion of the addition, 5-25pts.wt. of a monovinyl aromatic compound or acrylonitrile are added to complete the polymerization to prepare a thermoplastic resin. The product is mixed with a graft copolymer which has been obtained by grafting a mixture of 60-30pts.wt. of monovinyl aromatic compound and acrylonitrile onto 40-70pts.wt. of a rubber-like polymer so that the rubber-like polymer is contained by 10-30wt%, to give the objective composition. |