Patent ID: 6767977
Filing Date: 2004-07-27
Classification: C08F

Abstract:
Semicrystalline sulphonic fluorinated ionomers having an equivalent weight higher than 700 g/eq, up to 1,700, comprising:(A) monomeric units deriving from one or more fluorinated monomers containing at least one ethylene unsaturation; (B) fluorinated monomeric units containing sulphonyl groups â€”SO2F in such amount to give the above equivalent weight, deriving from F2C&boxH;CFâ€”Oâ€”(CF2)qâ€”SO2F, q being an integer equal to 2 or 3; and having the following properties for a TFE/(B) copolymer wherein q=2: hydration, expressed in % of H2O at 100Â° C. absorbed by the film prepared from the ionomer and after transformation from the â€”SO2F form into the â€”SO3H form, having the following values: atâ€‚â€‰750 EWhigher than>70%atâ€‚â€‰850 EWâ€³>55%at1,000 EWâ€³>40%at1,100 EWâ€³>32%at1,200 EWâ€³â€‰>25%.