COEXTRUDED MULTILAYER CATION EXCHANGE MEMBRANES

摘要

TITLE Coextruded Multilayer Cation Exchange Membranes A process for the preparation of a multilayer cationic ion exchange membrane is disclosed. At least two substantially incompatible melt-fabricable fluorinated polymers containing sulfonyl or carboxyl functional groups are heated to a temperature above the melting point of the polymers, brought into contact and coextruded into a composite film. The resulting composite film is cooled to a temperature below the melting point of each of the films and the functional groups of the polymers are converted to ionizable functional groups. The resulting membrane is useful as an ion exchange membrane, especially in the production of chlorine and caustic.