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US 4,228,246 AGranted
Manufacture of fluorocarbon expanded polystyrene
AssigneeAllied Chemical Corporation
InventorsBernard Taub, Daniel F. Harnish, Philip E. Jones
Life of this patent
Estimating the term…
Abstract
Improved polyolefin foams, particularly polystyrene foams, and improved extrusion processability thereof are obtained by employing as blowing agent a mixture of from about 3 to about 70 weight percent monochloromonofluoromethane and from about 97 to about 30 weight percent of dichlorodifluoromethane.
Claims6
In the process for the preparation of polyolefin foams comprising blending a thermoplastic polyolefin with a nucleating agent and a volatile foaming agent, and extruding said composition into a region of lower pressure to cause foaming;
- the improvement which comprises employing as the volatile foaming agent, a mixture comprising from about 3 to about 70 weight percent monochloromonofluoromethane and from 97 to about 30 weight percent dichlorodifluoromethane.
Dependencies are inferred from the claim text.