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US 5,204,169 AGranted
Polystyrene foams containing 1,1-defluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert O. York
Life of this patent
Estimating the term…
Abstract
This invention relates to the use of polyfluorocarbon blowing agents in the preparation of polymer foams; particularly the use of 1,1-difluoroethane in the preparation of polystyrene foams for food packaging and food serving.
Claims2
A closed-cell polymer foam prepared from a foam-forming composition consisting essentially of polystyrene and up to about 20 weight percent, based on the total weight of the composition, of 1,1-difluoroethane, said foam having a thickness from about 0.04 to about 4 inches and containing 2-30 parts per million of 1,1-difluoroethane.
Dependencies are inferred from the claim text.