Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1992-02-25
1993-03-16
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
264 455, 4283188, 521 51, 521904, 521909, B32B 326, B32B 2740, C08J 934
Patent
active
051943255
ABSTRACT:
A molded polyurethane foam system utilizing hydrofluorocarbons and alkane hydrocarbons as the blowing agent. The molded polyurethane foam products of the invention have a high-density integral skin and a low-density core. The blowing agent can be the HFC, tetrafluoroethane (HFC-134a) chemical alone or a mixture of tetrafluoroethane (HFC-134a) with one or more of the following: alkanes (such as 2-methylbutane, pentane and heptane) and other inert volatile organic compounds with boiling points in the 15.degree.-100.degree. C. range (such as pentene and acetone).
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Renosol Corporation
Van Balen William J.
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