| abstract |
1. Crosslinked sulphonic fluorinated ionomers having an equivalent weight 380-1300 g/eq, comprising: n (A) monomeric units deriving from one or more fluorinated monomers containing at least one ethylene unsaturation; n (B) fluorinated monomeric units containing sulphonyl groups —SO 2 F in an amount such as to give the above indicated equivalent weight. |