Foamable resins process

Details Foamable resins process Foamable resins process

1978-08-15

1980-10-07

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 60, 521918, C08J 918, C08J 920, C08J 922

Patent

active

042269423

ABSTRACT:
This invention relates to an improved process for the production of a particulate foamable polyvinyl aromatic resin of the type wherein a vinyl aromatic monomer is polymerized in an aqueous suspension system to produce beads of thermoplastic polyvinyl aromatic resin, separating the beads and incorporating a volatile liquid blowing agent in the separated beads at a temperature above the resin softening point under such conditions that foamable resin particles are produced, cooling said beads followed by separating and drying said beads, the improvement comprising: drying said beads under vacuum conditions at normal temperatures, removing residual water from said beads while retaining said blowing agent in said beads. Also included in the invention are foamable particles when produced by the above process and foamed articles made from the foamable particles.

REFERENCES:
patent: 3577360 (1971-05-01), Immel
patent: 3835073 (1974-09-01), Thimas

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