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US 4,281,092 AGranted
Vulcanizable fluorinated copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorAlmut F. Breazeale
Life of this patent
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Abstract
Vulcanizable copolymers of tetrafluoroethylene, perfluoromethyl perfluorovinyl ether and a cyano-substituted perfluorovinyl ether such as perfluoro-(8-cyano-5-methyl-3,6-dioxa-1-octene) and perfluoro-(9-cyano-5-methyl-3,6-dioxa-1-nonene) and elastomeric vulcanizates thereof.
Claims10
A copolymer, the elastomeric vulcanizate of which is suitable for use where extraordinary resistance to environmental attack by a temperature of 700.degree. F. and corrosive fluids is required, comprising copolymerized units of:
- (a) 53-79.8 mole percent tetrafluoroethylene,
- (b) 20-45 mole percent perfluoromethyl perfluorovinyl ether, and
- (c) 0.2-2 mole percent of a cure site monomer of the formula:
- ##STR18## where n=1-4 and x=1-2.
1 more element
Dependencies are inferred from the claim text.