Rhone-Poulenc Chimie

Frederic Kuntzburger

Jean Bachot

Process for the preparation of an asbestos-free microporous electroconductive substrate. The process includes (a) providing an aqueous suspension of a mixture of carbon or graphite fibers, polytetrafluoroethylene fibers, inert mineral fibers, at least one fluorinated polymer, a silica porogen, and, optionally, at least one thickening agent; (b) depositing a coating onto a porous support by programmedly vacuum filtering said suspension therethrough, the coating comprising a liquid medium; (c) removing the liquid medium from said coating and then drying same; (d) sintering the coating thus formed; and (e) extracting the silica porogen therefrom. A substrate including intimate admixture of carbon or graphite fibers, polytetrafluoroethylene fibers and inert mineral fibers, and optionally, at least one thickening agent, consolidated by a binding amount of at least one fluorinated polymer is formed. The substrate produced is well suited for the electrolysis of solutions of, e.g., alkali metal halides.

Process for the preparation of asbestos-free microporous

Cathodes comprised of an asbestos-free microporous electroconductive substrate containing (a) carbon/graphite fibers, (b) polytetrafluoroethylene (PTFE) fibers and (c) inert mineral fibers, and (d) optionally, at least one thickening agent, consolidated together in a matrix of (e) at least one fluoropolymer binder, are well suited for the electrolysis of solutions of, e.g., alkali metal halides.

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Le Plessis Bouchard, France

Frederic Kuntzburger