Molding expandable thermoplastic resins

Details Molding expandable thermoplastic resins Molding expandable thermoplastic resins

1976-03-23

1978-08-22

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 22, 264 54, 264DIG5, 264DIG18, 521 56, B29D 2700

Patent

active

041089340

ABSTRACT:
Shaped articles of organic polymer resins having cellular (foamed) structure are made from heat-expandable normally solid thermoplastic resin compositions in permeable molds particularly characterized by flooding the mold cavity and the expandable material therein with molten salt as heating medium. For example, a permeable mold, charged with pieces of polyethylene containing azobisformamide and crosslinked by electron irradiation, is immersed into a molten salt eutectic mixture of KNO.sub.3, NaNO.sub.2 and NaNO.sub.3 at about 264.degree. C, removed, cooled and washed with water, thereby forming a coherent, unitary cellular resin molded article completely filling the mold cavity.

REFERENCES:
patent: 2787809 (1957-04-01), Stastny
patent: 3259677 (1966-07-01), Zwick
patent: 3504068 (1970-03-01), Zizlsperger et al.
patent: 3562367 (1971-02-01), Shinohara et al.
patent: 3823213 (1974-07-01), Stastny et al.
patent: 3992501 (1976-11-01), Tatzel et al.

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