Patent ID: 7393906

Claim:
Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): wherein R′ F is equal to OR F wherein R F is a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; X 1 and X 2, equal to or different from each other, are F, CF 3 ; having a dioxole content≧95% by moles, having the following combination of properties: Tg, measured according to the ASTM 3418 (DSC) method, from 180° C. to 195° C.; intrinsic viscosity, measured at the temperature of 30° C. in perfluoroheptane according to the ASTM D 2857-87 method, from 13 cc/g to 100 cc/g.