Patent ID: 6730761
Filing Date: 2004-05-04
Classification: C08F

Abstract:
Thermoprocessable copolymers of TFE consisiting essentially of the following monomers in the indicated amounts:A) (a) 8.6-9.8% by weight of perfluoromethylvinylether (FMVE); (b) 0.3-1.2% 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 different from each other, are â€”F or â€”CF3; with the proviso that the sum of the percentages by weight of (a)+(b) is from 8.9 to 11% by weight; or B) (a) 4.5-8.5% by weight of perfluoromethylvinylether (FMVE); (b) 1.7-7.5% by weight of a perfluorodioxole as defined in A); with the proviso that the sum of the percentages by weight of (a)+(b) is from 6.2 to 11% by weight; the complement to 100% by weight in compositions A) and B) being TFE; said copolymers having: an amount of ionic end groups â€”COOH and â€”COF, not higher than 5Ã—10âˆ’4 moles/Kg polymer; release values of Fâˆ’ ions, determined on the polymer in pellet, not higher than 1 ppm by weight with respect to the polymer weight; wherein the manufactured articles obtained from the polymers having compositions A) or B) show the following mechanical properties: elongation at break&gE;130% measured at 23Â° C. along the welding lines of the injection moulded articles; stress at break&gE;2.5 MPa and elongation at break&gE;250%, measured at 250Â° C. on compression moulded plaque.