Low density, extruded ethylenic polymer foams

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

B - Operations, Transporting

29

D

18/679

B29D 27/00 (1980.01)

Patent

CA 1154568

Abstract of the Disclosure Disclosed are low density ethylenic polymer foam planks having density of from about 0.8 to about 1.9 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 ethylenic polymers by release to lower pressure of a flowable, foam- able gel under pressure, e.g., by extrusion foaming, wherein the gel comprises at least one ethylenic polymer and at least one volatile blowing agent. The process of making such foam planks is particularly characterized by the improvement wherein the flow- able gel is mixed sufficiently to disperse the blowing agent in the gel to an amount from about 13.5 to 35 x 10-4 moles per gram of the ethylenic polymer. C-28,220

362294

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