Abstract 863,862. Ion-exchange membranes. IMPERIAL CHEMICAL INDUSTRIES Ltd. Oct. 29, 1958 [Nov. 20, 1957], No. 36115/57. Class 2(6). Ion-exchange membranes are prepared by absorbing styrene in granules of polyethylene or polypropylene, polymerizing the styrene therein by heating with a catalyst, forming the granules into film, and then treating with reagents which introduce ion-exchange groups into the polystyrene, the conditions being such that the carrier is unaffected. Catalysts specified are benzoyl peroxide and azo-di-isobutyronitrile. In an example a cation-exchange membrane containing sulphonic groups is obtained by the use of chlorosulphonic acid. Anion-exchange resins containing quaternary ammonium or amino groups may also be obtained.
IN A PROCESS FOR THE PRODUCTION OF ION EXCHANGE MATERIALS WHICH INCLUDES THE INTRODUCTION OF ION EXCHANGE GROUPS INTO THE AROMATIC CONSTITUENT OF A FILM CONSISTING ESSENTIALLY OF A CARRIER SELECTED FROM POLYETHYLENE AND POLYPROPYLENE, AND STYRENE POLYMERIZED IN SITU THEREIN BY TREATING SAID FILM WITH A GROUP WHICH CNFERS ION EXCHANGE PROPERTIES THEREON, THE STEPS OF SUCCESSIVELY MIXING A PREDETERMINED QUANTITY OF STYRENE MONOMER WITH AND ABSORBING IT INTO SAID CARRIER SELECTED FROM POLYETHYLENE AND POLYPROPYLENE IN GRANULAR FORM IN THE PRESENCE OF A POLYMERIZATION CATALYST, HEATING SAID RESULTING GRANULES UNTIL THE STYRENE MONOMER ABSORBED THEREIN HAS BEEN CONVERTED INTO A POLYMERIC RESINOUS PRODUCT, AND FORMING A FILM FROM THE RESULTING THERMOPLASTIC GRANULES AT A TEMPERATURE OF FROM ABOUT 90 TO 95*C. BY THE APPLICATION OF HEAT AND PRESSURE.
Claim 2
Dependent Claim
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IN A PROCESS FOR THE PRODUCTION OF ION EXCHANGE MATERIALS WHICH INCLUDES THE INTRODUCTION OF ION EXCHANGE GROUPS INTO THE AROMATIC CONSTITUENT OF A FILM CONSISTING ESSENTIALLY OF A CARRIER SELECTED FROM POLYETHYLENE AND POLYPROPYLENE, AND STYRENE POLYMERIZED IN SITU THEREIN BY TREATING SAID FILM WITH A GROUP WHICH CNFERS ION EXCHANGE PROPERTIES THEREON, THE STEPS OF SUCCESSIVELY MIXING A PREDETERMINED QUANTITY OF STYRENE MONOMER WITH AND ABSORBING IT INTO SAID CARRIER SELECTED FROM POLYETHYLENE AND POLYPROPYLENE IN GRANULAR FORM IN THE PRESENCE OF A POLYMERIZATION CATALYST, HEATING SAID RESULTING GRANULES UNTIL THE STYRENE MONOMER ABSORBED THEREIN HAS BEEN CONVERTED INTO A POLYMERIC RESINOUS PRODUCT, AND FORMING A FILM FROM THE RESULTING THERMOPLASTIC GRANULES AT A TEMPERATURE OF FROM ABOUT 90 TO 95*C. BY THE APPLICATION OF HEAT AND PRESSURE.