Patent ID: 6545111
Filing Date: 2003-04-08
Classification: C08F

Abstract:
A thermoprocessable copolymer of TFE consisting essentially of:(a) from 4.5 to 8.5by weight of perfluoromethylvinylether (PMVE); (b) from 0.3 to 1.6% by weight of a perfluorodioxole of formula: â€ƒwherein: Y&boxH;F, ORf, Rf wherein Rf is a perfluoroalkyl having from 1 to 5 carbon atoms; X1 and X2, equal to or diferent from each other, are â€”F or â€”CF3; (c) TFE, forming the remaining part to 100%; said copolymer having: a number of ionic end groups lower than 4Ã—10âˆ’4 mol/Kg of polymer; flex life values higher than 20,000 in a MFI range (measured at 372Â° C. with a 5 Kg load) comprised between 1 and 5; release values of Fâˆ’ ions on the polymer in pellet and on the finished manufactured article lower than 1 ppm by weight with respect to the polymer weight; release values of Fâˆ’ ions lower than 1 ppm on extruded manufactured articles, both at low and high extrusion rate of the polymer.