C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/191, 117/43
C25B 13/06 (2006.01) C25B 11/03 (2006.01) C25B 13/04 (2006.01) D01D 5/40 (2006.01)
Patent
CA 1207705
ABSTRACT The invention provides for diaphragm coated electrodes and processes for producing these diaphragm coated electrodes, as well as application of the diaphragm coated electrodes in electrolytic cells used in the electrolysis of brine to produce chlorine and caustic. Specifically is disclosed a process whereby a slurry of asbestos fibers and polytetrafluoro- ethylene fibrids are deposited on a foraminous electrically conductive substrate to form a mat for a diaphragm. The deposited slurry is heated to dry the mat and then there is a subsequent heating which may be around the transition temperature of polytetrafluoroethylene (327°C), and up to a temperature no more than 400°C in order to avoid degradation of the polytetrafluoroethylene. The polytetrafluoroethylene fibrids are produced by shearing action on fibrillatable polymer, as opposed to the die-drawn polymer of the prior art. The cost of the die-drawn polytetrafluoroethylene fibers of relatively large diameter is excessive and exceeds the cost of fibrids as described in the instant invention.
383721
Benezra Leo L.
Hazzard John P.
Horvat Lewis R.
Tsai Shan-Pu
Eltech Systems Corporation
Gowling Lafleur Henderson Llp
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