| 摘要 |
PURPOSE:To obtain the titled resin particles having heat resistance and solvent resistance, by subjecting a specific amount of alpha-methylstyrene, a specified amount of acrylonitrile and a specific monomer to suspension polymerization with a bifunctional organic peroxide as an initiator and an easily volatile blowing agent at a specific temperature. CONSTITUTION:10-80wt% alpha-methylstyrene, 5-50wt% acrylonitrile, 0-70wt% one or more monomers of styrene, methyl methacrylate, vinyltoluene, and t- butylstyrene and a bifunctional organic peroxide (preferably producing t-butoxy radical) as an initiator are subjected to suspension polymerization at 80-130 deg.C by adding 2-15wt% easily volatile blowing agent during polymerization or after polymerization. When high expansion is required, preferably 0.5-2.0wt% solvent or plasticizer is added to the reaction system.
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