Fluorinated ionomers

Details Fluorinated ionomers Fluorinated ionomers

C - Chemistry, Metallurgy

08

F

C08F 214/18 (2006.01) C08F 8/00 (2006.01) C08F 214/26 (2006.01) C08J 5/22 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2414504

Semicrystalline sulphonic fluorinated ionomers having an equivalent weight higher than 700 g/eq, up to 1,700, com- prising: (A) monomeric units deriving from one or more fluorinated monomers containing at least one ethylene unsaturation; (B) fluorinated monomeric units containing sulphonyl groups -SO2F in such amount to give the above equivalent weight, deriving from F2C=CF-O-(CF2)q-SO2F, q being an integer equal to 2 or 3; and having the following properties for a TFE/(B) copoly- mer: - hydration, expressed in % of H2O at 100°C absorbed by the film prepared from the ionomer and after tranforma- tion from the -SO2F form into the -SO3H form, having the following values: at 750 EW higher than 55%, pref. >70% at 850 EW " 45%, " >55% at 1,000 EW " 35%, " >40% at 1,100 EW " 28%, " >32% at 1,200 EW " 23%, " >25%

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