Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1982-09-07
1983-06-07
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 53, 264DIG5, 521 81, 521134, 521143, C08J 900
Patent
active
043871690
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.times.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.
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"Crystalline Olefin Polymers", Raff et al., Part I, Copyright 1965, John Wiley & Sons Inc., p. 681.
Bussey Marlin G.
Zabrocki Vincent S.
Foelak Morton
The Dow Chemical Co.
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