Heat-treated fluorocarbon sulfonylamine cation permselectivity
Patent 3969285 Issued on July 13, 1976. Estimated Expiration Date: 
July 13, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 13, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3041317 3240723 3282875 3647086 InventorAssigneeApplicationNo. 425079 filed on 12/17/1973US Classes:521/32, Treated with nitrogen-containing material204/262, With heater or cooler204/296, Organic210/500.25, Metal containing210/500.41, Sulfone521/33, Treated with sulfur-containing material526/243Fluorine-containing monomer contains a sulfur atomExaminersPrimary: Schofer, Joseph L.Assistant: Kulkosky, Peter F. AbstractFluorinated cation exchange polymers are obtained from intermediate fluorinated polymers containing pendant sulfonyl halide groups which are reacted with a di- or polyamine and subjected to elevated temperature of the order of 170° to 300°C. The polymers are desirably employed with pendant side groups in the salt form. The polymers possess perm-selectivity giving desirable performance in electrolytic cells such as chlor-alkali cells as well as membrane ion exchanger and reverse osmosis devices. |
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