| 摘要 |
PURPOSE:The titled particles exhibiting excellent heat and solvent resistance and good expandability and moldability, made by covering the surface of particles of an expandable thermoplastic copolymer containing alpha-methylstyrene and acrylonitrile with a specified edible oil. CONSTITUTION:The surface of particles of an expandable thermoplastic copolymer which contains monomers comprising 10-80wt% alpha-methylstyrene, 5-50wt% acrylonitrile, and 0-70wt% of one or more compounds selected from among styrene, t-butylstyrene, and a (meth)acrylate, and 2-15wt% volatile foaming agent is covered with an edible oil which is liquid at ordinary temperatures. This covering gives molded foams suffering no tertiary foaming and little dimensional change and having excellent heat resistance.
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