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A process for making a composite ion exchange membrane including fabricating a layered membrane precursor including a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer, hydrolyzing the layered membrane precursor to convert the

A process for making a composite ion exchange membrane including fabricating a layered membrane precursor including a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer, hydrolyzing the layered membrane precursor to convert the highly fluorinated sulfonyl halide polymer to highly fluorinated sulfonate polymer, impregnating the microporous support with a dispersion of highly fluorinated sulfonate polymer or precursor thereof in a polar liquid medium after hydrolyzing, removing the polar liquid medium, and heating to coalesce the highly fluorinated sulfonated polymer in the support.

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[ What is claimed is:] [1.] A process for making a composite ion exchange membrane comprising:fabricating a layered membrane precursor comprising a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer;hydrolyzing said layered mem

[ What is claimed is:] [1.] A process for making a composite ion exchange membrane comprising:fabricating a layered membrane precursor comprising a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer;hydrolyzing said layered membrane precursor to convert said highly fluorinated sulfonyl halide polymer to highly fluorinated sulfonate polymer;impregnating said microporous support with a dispersion of highly fluorinated sulfonate polymer or precursor thereof in a polar liquid medium after said hydrolyzing;removing said polar liquid medium; andheating to coalesce the highly fluorinated sulfonate polymer in said support;said highly fluorinated sulfonate polymer layer being contacted with a dry gas during said impregnating of said microporous support with said dispersion to cause at least partial removal of said polar liquid medium by passage through said layer, said removal of said polar liquid medium through said highly fluorinated sulfonated polymer layer assisting said impregnating of said dispersion into said porous layer.