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US 4,252,859 AGranted
Fluoropolymer blend coating compositions containing copolymers of perfluorinated polyvinyl ether
AssigneeE. I. Du Pont de Nemours and Company
InventorsThomas P. Concannon, Eva M. Vary
Life of this patent
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Abstract
Blends of PTFE and perfluorinated ether copolymers of TFE and perfluoro(propyl vinyl ether) provide coating compositions which have reduced crystallinity and useful lives superior to what would be expected from averaging the properties of the unblended resins themselves.
Claims19
A coating composition comprising, by weight,
- (A) 50-95% of a particulate polymer of monoethylenically unsaturated hydrocarbon monomers completely substituted with fluorine atoms or a combination of fluorine atoms and chlorine atoms, the polymer having a number average molecular weight of at least 20,000;
- and
- (B) 10-50% of a perfluorinated copolymer containing (i) 99.5-92% tetrafluoroethylene, (ii) 0.5-8% at least one vinyl ether having the formula:
- CF.sub.2 .dbd.CF--O--R.sub.f
- in which R.sub.f represents one or more perfluoroalkyl radicals having from 1 to 10 carbon atoms or a perfluorinated ether having the formula:
- ##STR2## in which n is zero to 4, and optionally, (iii) hexafluoropropylene.
3 more elements
Dependencies are inferred from the claim text.