Process for preparing cation-exchange membrane
Patent 4132682 Issued on January 2, 1979. Estimated Expiration Date: 
June 27, 1997. 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.
June 27, 1997. 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 3839172 Trifluorostyrene sulfonic acid membranes Patent #: 4012303 InventorsAssigneeApplicationNo. 05/810628 filed on 06/27/1977US Classes:521/27, Membrane or process of preparing210/500.27, Organic526/247Fluorine containing monomer is an etherExaminersPrimary: Levin, Stanford M.Attorney, Agent or FirmInternational ClassesC08F 259/00 (20060101)C08F 259/08 (20060101) Foreign Application Priority Data1976-08-31 JPAbstractA cation-exchange membrane is prepared by impregnating a diene monomer having carboxylic acid group or a functional group which can be converted to a carboxylic acid group, into a fluorinated polymer membrane having cation-exchangeable groups; partially polymerizing said diene monomer; swelling the membrane with a water miscible organic solvent and heat-treating the swollen membrane and if necessary, converting the functional groups to carboxylic acid groups. | |
