C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/202, 18/23
C25B 1/46 (2006.01) C08J 9/26 (2006.01) C25B 13/00 (2006.01) C25B 13/08 (2006.01) H01M 2/16 (2006.01) B29C 43/00 (2006.01)
Patent
CA 1179974
ABSTRACT OF THE DISCLOSURE The invention disclosed herein relates to a polymeric micro- porous electrolytic cell separators for producing alkali metal hydroxio? at high current efficiencies, said separator having: a. porosity of at least about 60%; b. thickness of between 8 and 130 mils; c. hysteresis of from .30 to .99 wherein hystersis is defined as the ration of the amount of mercury trapped within the pore structure of the separator after release of pressure to 1 psi compared to the amount of mercury present when first subjected to total impregnation by mercury at 50,000 psi, and d. distribution of pore sizes in a range between 0.004 and 34 microns wherein at least 85% of said pores have a diameter of between 0.12 and 33 microns and at least 60% of said pores have a diameter between 0.59 and 33 microns; wherein the porosity, thickness, hysteresis, and pore size distribution are adapted to provide the separator with the property of ex- hibiting a high current efficiency including the property of a current efficiency of about 85% to about 98% when measured at a sodium hydroxide concentration of 150 gpl. The separator also possesses hydraulic properties which renders them suitable for use in a commercial scale cell. Also disclosed herein is a method for preparing the separators of this invention comprising the steps (a) forming a sheet comprising a fluorocarbon polymer, a pore forming addi- tive and a fluorinated surface active agent; (b) sintering the sheet: and (c) removing the pore forming additive.
338678
Cook Edward H. Jr.
Lazarz Christine A.
Schulz Arthur C.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Occidental Chemical Corporation
LandOfFree
Polymeric microporous separators for use in electrolytic... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymeric microporous separators for use in electrolytic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymeric microporous separators for use in electrolytic... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1297445