Process for producing foamed polyolefin articles from aged pre-f

Details Process for producing foamed polyolefin articles from aged pre-f Process for producing foamed polyolefin articles from aged pre-f

1981-06-22

1983-08-16

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 264DIG15, 264DIG16, 264DIG18, 521 56, 521 60, B29D 2700

Patent

active

043990878

ABSTRACT:
In a process for producing a foamed article of a polyolefin resin which comprises filling in a mold pre-foamed particles of a polyolefin resin containing a gaseous mixture consisting of an inorganic gas and a volatile organic blowing agent in their cells and heating them to mold a foamed article; the improvement wherein the pre-foamed particles of the resin are those in which the total pressure of the gaseous mixture is 1.4 to 2.5 kg/cm.sup.2 (abs.), with the partial pressure of the inorganic gas being maintained at 0.4 to 1.1 kg/cm.sup.2 (abs.) and the partial pressure of the volatile blowing agent at 0.8 to 1.6 kg/cm.sup.2 (abs.).

REFERENCES:
patent: 3725320 (1973-04-01), Wang
patent: 3755518 (1973-08-01), Stastny et al.
patent: 3840628 (1974-10-01), Stastny et al.
patent: 4108934 (1978-08-01), Rubens et al.
patent: 4275023 (1981-06-01), Shimizu et al.

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