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US 5,470,449 AGranted
Microporous asbestos-free diaphragms/cathodes for electrolytic cells
AssigneeRhone-Poulenc Chimie
InventorsJean Bachot, Pascal Stutzmann
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AssigneeRhone-Poulenc Chimie
InventorsJean Bachot, Pascal Stutzmann
Estimating the term…
Microporous diaphragms adapted for wet-consolidation with composite cathodes for use in electrolytic cells, e.g., chlorine/soda electrolysis cells, comprise a sintered, fluoropolymer microconsolidated asbestos-free microporous fibrous sheet material, such sheet material including from 3% to 35% by weight of fluoropolymer binder, from 0% to 50% by weight of a uniformly distributed gel of an oxohydroxide of at least one metal of Groups IVA, IVB, VB and VIB of the Periodic Table or of the lanthanide or actinide series thereof, and from 20% to 95% by weight of a mixture of poly-tetrafluoroethylene (PTFE) fibers and inorganic fibers, such inorganic fibers constituting from 1% to 80% by weight of the mixture and such inorganic fibers including carbon, graphite or titanate fibers, or admixture thereof.
A microporous diaphragm which comprises a sintered, fluoropolymer microconsolidated asbestos-free microporous fibrous sheet material, said sheet material comprising from 3% to 35% by weight of a fluoropolymer binder comprising a homopolymer or a copolymer derived at least partly from olefinic monomers completely substituted by fluorine atoms or completely substituted by a combination of fluorine atoms and of at least one of chlorine, bromine or iodine atoms per monomer, from 0% to 50% by weight of a gel of an oxohydroxide of at least one metal of Groups IVA, IVB, VB and VIB of the Periodic Table or of the lanthanide or actinide series thereof, and from 20% to 95% by weight of a mixture of polytetrafluoroethylene fibers and inorganic fibers, said inorganic fibers constituting from 1% to 80% by weight of such mixture and said inorganic fibers comprising titanate fibers, optionally in admixture with carbon or graphite fibers, or admixture thereof, wherein said diaphragm is non-conductive.
A microporous diaphragm which comprises a sintered, fluoropolymer micro consolidated asbestos-free microporous fibrous sheet material, said sheet material comprising from 3% to 35% by weight of a fluoropolymer binder, an amount of from 5% to 25% by weight of a gel of an oxohydroxide of at least one metal of Groups IVA, IVB, VB and VIB of the Periodic Table or of the lanthanide or actinide series thereof, and from 20% to 95% by weight of a mixture of polytetrafluoroethylene fibers and inorganic fibers, said inorganic fibers constituting from 1% to 80% by weight of such mixture and said inorganic fibers comprising carbon, graphite or titanate fibers, or mixtures thereof.
A microporous diaphragm which comprises a sintered, fluoropolymer microconsolidated asbestos-free microporous fibrous sheet material, said sheet material comprising from 30 to 35% by weight of a fluoropolymer binder comprising a homopolymer or a copolymer derived at least partly from olefinic monomers completely substituted by fluorine atoms or completely substituted by a combination of fluorine atoms and of at least one of chlorine, bromine or iodine atoms per monomer, from 0 to 50% by weight of a gel of an oxohydroxide of at least one metal of Groups IVA, IVB, VB and VIB of the Periodic Table or of the lanthanide or actinide series thereof, and from 20 to 95% by weight of a mixture of polytetrafluoroethylene fibers and inorganic fibers, said inorganic fibers constituting from 1% to 80% by weight of such mixture and said inorganic fibers comprising at least 5% by weight of titanate fibers or from 1 to 10% by weight of carbon or graphite fibers.
A microporous diaphragm which comprises a sintered, fluoropolymer microconsolidated asbestos-free microporous fibrous sheet material, said sheet material comprising from 3% to 35% by weight of a fluoropolymer binder, from 2% to 50% by weight of a gel of an oxohydroxide of at least one metal of Groups IVA, IVB, VB and VIB of the Periodic Table or of the lanthanide or actinide series thereof, and from 20% to 95% by weight of a mixture of polytetrafluoroethylene fibers and inorganic fibers, said inorganic fibers constituting from 1% to 80% by weight of such mixture and said inorganic fibers comprising carbon, graphite or admixture thereof, wherein said diaphragm is non-conductive.
Dependencies are inferred from the claim text.