Expandable thermoplastic resin particles and process for prepari

Details Expandable thermoplastic resin particles and process for prepari Expandable thermoplastic resin particles and process for prepari

1984-05-04

1985-09-03

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521147, C08J 918

Patent

active

045393354

ABSTRACT:
Expandable thermoplastic resin particles having excellent heat resistance, solvent resistance, foamability and moldability comprising a copolymer of 10 to 80% by weight of .alpha.-methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one member selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butylstyrene, and an expanding agent impregnated in the copolymer, prepared easily in high conversions by an aqueous suspension polymerization using particular difunctional organic peroxides, preferably those capable of producing t-butoxy radicals, followed by impregnation of the produced polymer particles with the expanding agent.

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