Extruded polyolefin foam in thicker grades and plank and process

Details Extruded polyolefin foam in thicker grades and plank and process Extruded polyolefin foam in thicker grades and plank and process

1997-09-30

2000-02-29

Copenheaver, Blaine

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

264 459, 264 54, 264DIG5, 428338, 428339, 521 79, 521 98, 521910, B29C 6720, C08J 906

Patent

active

060306963

ABSTRACT:
An extruded polyolefin foam in thicknesses of at least about 12 mm and greater of improved compressive strength, extensional viscosity, and reduced aging time and a process for making the foam are disclosed. The foam is prepared using a propane blowing agent. The beneficial properties imparted to thicker grade and plank foams by a propane blowing agent can be achieved with up to as much as 75% by volume of either normal butane or isobutane or both in the blowing agent, depending on the polyolefin selected.

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