A self-supporting conductive polymer film having distributed therein an electrically conductive polymer composition containing linearly conjugated .pi.-electron systems and residues of sulfonated lignin or a sulfonated polyflavonoid. The conductive polymer film preferably has a surface resistivity of from about 10.sup.2 ohms per square to about 10.sup.10 ohms per square and is preferably formed from a liquid dispersion of thermoplastic polymer having the electrically conductive polymer composition distributed therein. In a preferred embodiment, heat sealable conductive fluoropolymer films are prepared.

 
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> Membrane and the use thereof

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