Process for preparing polyolefin foam

Details Process for preparing polyolefin foam Process for preparing polyolefin foam

1983-01-14

1984-11-20

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264DIG5, 264DIG15, 264DIG18, B29D 2700

Patent

active

044838093

ABSTRACT:
The present invention relates to a process for preparing a polyolefin foam by heat-molding pre-expanded beads of an expandable polyolefin resin containing a foaming agent in a mold, said process being improved in preparing beads having a peak expansion rate at pre-expansion equal to 1.3 to 3 times the expansion rate of beads to be packed into the mold, adjusting the beads to a pre-expansion rate depending on an expansion rate of the desired foam, and packing and molding the pre-expanded beads in a mold without any further addition of expandability thereto. The polyolefin foam prepared by the process of the present invention is evenly fused to the interior and is less liable to shrink or deform.

REFERENCES:
patent: 2744291 (1956-05-01), Stastny et al.
patent: 2787809 (1957-04-01), Stastny
patent: 2816827 (1957-12-01), Roth
patent: 3504068 (1970-03-01), Zizlsperger et al.
patent: 3725320 (1973-04-01), Wang
patent: 3804378 (1974-04-01), Walls et al.
patent: 3856719 (1974-12-01), Miyamoto et al.
patent: 3953558 (1976-04-01), Hatano et al.
patent: 4150077 (1979-04-01), Slocumb
patent: 4368276 (1983-01-01), Park
patent: 4399087 (1983-08-01), Akiyama et al.

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