Ion exchange polymer film, consisting of fluorinated polymer with N-monosubstituted sulfonamido groups method and apparatus for electrolysis of alkali or alkaline earth metal halide
Patent 4085071 Issued on April 18, 1978. Estimated Expiration Date: 
April 18, 1995. 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.
April 18, 1995. 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 3240723 3647086 3784399 3849243 3909378 InventorsApplicationNo. 623920 filed on 10/20/1975US Classes:428/220, Physical dimension specified204/252, Diaphragm type205/521, Multilayered membrane428/339, Including synthetic resin or polymer layer or component521/29, Polymer characterized by defined size or shape other than bead or pearl521/32, Treated with nitrogen-containing material525/326.2, Polymer derived from fluorine monomer525/379, Organic amine526/242, From fluorine containing monomer526/247, Fluorine containing monomer is an ether526/248Fluorine containing monomer contains nitrogen atomExaminersPrimary: Schofer, Joseph L.Assistant: Kulkosky, Peter F. International ClassC09D 003/78AbstractAn ion exchange film comprises a fluorine-containing polymer with (1) ion exchange sites present in a first layer as N-monosubstituted sulfonamido groups or salt thereof formed through reaction of a primary amine and (2) ion exchange sites present in a second layer of the film other than as said N-monosubstituted group or salt thereof. The film is suitable as a separator in a cell for electrolysis of an alkali or alkaline earth metal halide particularly sodium chloride in producing hydrogen, chlorine and caustic soda. In making concentrated caustic soda, high current efficiencies have been obtained in operation of the cell. |
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