Patent ID: 6774196
Filing Date: 2004-08-10
Classification: C08F,C08L

Abstract:
A fluorine-containing copolymer comprising90 to 99.4% by mole of a repeating unit derived from tetrafluoroethylene, 0.5 to 5% by mole of a repeating unit derived from at least one lower perfluoro(alkyl vinyl ether) represented by the formula (1): CF2&boxH;CFâ€”Oâ€”Rf1â€ƒâ€ƒ(1) in which Rf1 is a perfluoroalkyl group having 2 to 4 carbon atoms, and 0.1 to 5% by mole of a repeating unit derived from at least one higher perfluoro(vinyl ether) represented by the formula (2):CF2&boxH;CF&boxH;Oâ€”Rf2â€ƒâ€ƒ(2) in which Rf2 is a perfluoro(alkoxy alkyl) group having 4 to 17 carbon atoms,wherein the fluorine-containing copolymer has a melt flow rate of 0.1 g/10 minutes to 100 g/10 minutes and melting point of 290Â° to 325Â° C.