Patent ID: 8007863

Claim:
A method of increasing the release life of a multi-layer article comprising powder coating a foodware substrate with a fluoropolymer composition comprising a fluoropolymer selected from: (a) a copolymer consisting of from 80 to 94% by weight tetrafluoroethylene, from 6 to 20% by weight of one or more perfluorovinyl ethers of the formula CF 2 ═CFO(R a f O) n (R b f O) m R c f wherein R a f and R b f are each independently selected from linear or branched perfluoroalkylene groups of 1 to 6 carbon atoms, m and n are each independently 0 to 10 and R c f is a perfluoroalkyl group of 1 to 6 carbon atoms, wherein when the copolymer is a bipolymer of tetrafluoroethylene and one perfluorovinyl ether and the perfluorovinyl ether content is less than 7% by weight, the fluoropolymer has an MFI of 5 or less; and (b) a copolymer comprising from 80 to 94% by weight tetrafluoroethylene, from 5 to 20% by weight of a perfluorovinyl ether of the formula CF 2 ═CFO(R a f O) n (R b f O) m R c f wherein R a f and R b f are each independently selected from linear or branched perfluoroalkylene groups of 1 to 6 carbon atoms, m and n are each independently 0 to 10 and R c f is a perfluoroalkyl group of 1 to 6 carbon atoms, and up to 15% by weight of one or more additional monomers based on the total weight of the fluoropolymer.