Process for producing a foamed thermoplastic resin article

Details Process for producing a foamed thermoplastic resin article Process for producing a foamed thermoplastic resin article

1974-10-02

1976-10-26

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264 54, 264174, B29D 2700

Patent

active

039884040

ABSTRACT:
This invention generally pertains to a process for producing a foamed thermoplastic resin article by utilizing the phenomenon that a solid thermoplastic resin sorbs a gas under pressure, and more particularly to a process for producing a foamed thermoplastic resin article comprising the steps of making a solid thermoplastic resin containing a nucleating agent quickly sorb a gas under a high pressure P.sub.1, lowering said gas pressure to a low pressure P.sub.2 (P.sub.1 > P.sub.2 > the atmospheric pressure) when the gas sorption quantity reaches a predetermined value so as to equilibrate or stabilize said predetermined gas sorption quantity, feeding said gas sorbed thermoplastic resin into an extruder while said gas pressure is maintained at said low pressure P.sub.2 and extruding the resultant resin to thereby produce a foamed thermoplastic resin article. In this invention, the gas sorbed by the thermoplastic resin contributes to foam in the thermoplastic resin.

REFERENCES:
patent: 2714748 (1955-08-01), Stirnemann et al.
patent: 2751627 (1956-06-01), Lindemann
patent: 2768407 (1956-10-01), Lindemann
patent: 3054146 (1962-09-01), Griffin
patent: 3217364 (1965-11-01), Genest
patent: 3489830 (1970-01-01), Grigull
patent: 3538203 (1970-11-01), Overcashier et al.
patent: 3806291 (1974-04-01), Hendry
patent: 3879155 (1975-04-01), Hendry

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