Low density, extruded ethylenic polymer foams

Details Low density, extruded ethylenic polymer foams Low density, extruded ethylenic polymer foams

1981-10-01

1983-01-25

Foelak, Morton

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

264 53, 264DIG5, 521 79, 521 81, 521134, 521143, B32B 700, C08F11002

Patent

active

043703780

ABSTRACT:
Disclosed are low density foam planks of ethylenic polymers, which planks have a density of from about 0.8 to about 1.6 pounds per cubic foot, dimensional stability, substantially closed-cell structure, a cross-sectional area of at least six square inches and a minimum cross-sectional dimension of at least 0.5 inch. Such foam planks are made from polyethylene resins (e.g., low density polyethylene) by release to lower pressure of a flowable, foamable gel under pressure, e.g., by extrusion foaming, wherein the gel comprises at least one polyethylene resin and at least one volatile blowing agent. The process of making such foam planks is particularly characterized by the improvement wherein the flowable gel is mixed sufficiently to disperse the blowing agent in the gel to an amount from about 13.5 to 35+10.sup.-4 moles per gram of the ethylenic polymer and such process is especially beneficial in that it enables the preparation of substantially closed-cell polyethylene foams having densities of from 0.8 to about 1.9 via extrusion foaming in conjunction with certain C.sub.2 -C.sub.4 fluorocarbon blowing agents.

REFERENCES:
patent: 3379802 (1968-04-01), Roley et al.
patent: 3766099 (1973-10-01), Kowai et al.
"Crystalline Olefin Polymers", Raff et al, Part I, .COPYRGT.1965, John Wiley & Sons Inc., p. 681.

Affiliated with

Also associated with

Rating

Low density, extruded ethylenic polymer foams does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low density, extruded ethylenic polymer foams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low density, extruded ethylenic polymer foams will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1623983