Patent ID: 6703464
Filing Date: 2004-03-09
Classification: C08F,H01B

Abstract:
A fluorine-containing copolymer obtained by copolymerizing tetrafluoroethylene, hexafluoropropylene and optionally perfluoro vinyl ether as component monomers,wherein a weight ratio of tetrafluoroethylene, hexafluoropropylene and perfluoro vinyl ether units constituting said fluorine-containing copolymer is 70 to 95:5 to 20:0 to 10, respectively; said fluorine-containing copolymer having: a melt flow rate of 30 (g/10 minutes) or more; a volatile content index of 0.2% by weight or less; and a stress relaxation modulus G(t) (unit: dyn/cm2) which satisfies the following formula at t=0.1 second when measured at a temperature of 310Â° C.: G(0.1)>7Ã—106Ã—Xâˆ’1.6143âˆ’3000 where X denotes the melt flow rate (unit: g/10 minutes).