Process for producing polyolefin foams

Details Process for producing polyolefin foams Process for producing polyolefin foams

1978-12-11

1980-08-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264211, 264DIG5, 264DIG13, 425376R, 425817C, B29D 2700

Patent

active

042173191

ABSTRACT:
In a process for producing a foamed polyolefin article which comprises melting and mixing a polyolefin, a volatile organic blowing agent, a cell size-controlling agent, and an ester of a long-chain fatty acid and a polyhydric alcohol in an extruder comprising a feed zone, a compression zone and a metering zone, and extruding the resultant molten gel into an area having a lower pressure than the pressure of the inside of the extruder, the improvement wherein said ester is at least one ester of a long-chain fatty acid having 8 to 20 carbon atoms and a polyhydric alcohol having 3 to 6 hydroxyl groups, and said ester is fed in the molten state into the molten gel within the metering zone and mixed with it.

REFERENCES:
patent: 3287477 (1966-11-01), Vesilind
patent: 3644230 (1972-02-01), Cronin
patent: 3755208 (1973-08-01), Ehrenfreund

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