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AssigneeE. I. Du Pont de Nemours and Company
InventorsRALPH MUNSON ATEN, HEIDI ELIZABETH BURCH, SUNDAR KILNAGAR VENKATARAMAN, ROBERT THOMAS YOUNG
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The present invention provides oriented film comprising the composition 55 to 95 wt % tetrafluoroethylene/hexafluoropropylene/-perfluoro(alkyl vinyl ether) copolymer and 45 to 5 wt % tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer to total 100 wt % based on the combined weight of said copolymers, wherein the alkyl in each copolymer comprises 1 to 4 carbon atoms and wherein the presence of the tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer in the composition and the presence of perfluoro(alkyl vinyl ether) in both copolymers improves the thermoformability of the film as compared to oriented film of the same film thickness comprising the tetrafluoroethylene/hexafluoropropylene/perfluoro-(alkyl vinyl ether) copolymer by itself.
Oriented film comprising the composition 55 to 95 wt % tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer and 45 to 5 wt % tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer to total 100 wt % based on the combined weight thereof, wherein said alkyl in each said copolymer comprises 1 to 4 carbon atoms.
Process comprising thermoforming an oriented film comprising 55 to 95 wt % tetrafluoroethylene/hexafluoropropylene/perfluoro(alkyl vinyl ether) copolymer and 5 to 45 wt % tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer to total 100 wt % based on the combined weight thereof, wherein said alkyl in each said copolymer comprises 1 to 4 carbon atoms,
Dependencies are inferred from the claim text.