| 摘要 |
PURPOSE:To manufacture industrially profitably the titled particles exhibiting excellent heat and solvent resistance and good expandability and moldability, by copolymerizing a specified monomer mixture using a specified initiator, followed by impregnation of the polymer with a volatile foaming agent. CONSTITUTION:A monomer mixture comprising 10-80wt% alpha-methylstyrene, 5- 50wt% acrylonitrile, and 0-70wt% of one or more compounds selected from among styrene, chlorostyrene, p-methylstyrene, t-butylstyrene, and a (meth)acrylate is copolymerized at 80-150 deg.C using 0.05-3.0wt% trifunctional organic peroxide having a 10hr half-life temperature of 50-130 deg.C (e.g. a compound of the formula) as an initiator. During or after polymerization, the polymer particles are impregnated with a volatile foaming agent (e.g. butane) to produce the titled particles.
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