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US 5,663,255 AGranted
Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsColin Anolick, Robert Clayton Wheland
Life of this patent
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Abstract
Disclosed herein are novel amorphous tetrafluoroethylene-hexafluoropropylene (TFE-HFP) copolymers, which are more random than previous amorphous TFE-HFP copolymers, as well as a novel high productivity continuous process for making these polymers. The polymers are particularly useful in the form of coatings, films and encapsulants.
Claims12
An amorphous polymer, consisting essentially of, repeat units of the formula:
- (a) at least about 30 mole percent of
- --CF(CF.sub.3)--CF.sub.2 -- (I)
- (b) at least about 1 mole percent
- --CF.sub.2 --CF.sub.2 -- (II)
- (c) 0 to about 10 mole percent ##STR2## wherein X is --C.sub.n F.sub.2n+1 or --OC.sub.n F.sub.2n+1, m is 2, 3 or 4, and n is an integer of 2 to 20, with --C.sub.n F.sub.2n+1 or an integer of 1 to 20 with --OC.sub.n F.sub.2n+1 ;
- and
- provided that in said polymer less than 20 mole percent of (I) is present in the form of triads.
4 more elements
Dependencies are inferred from the claim text.