B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/27, 117/88.5
B01D 13/04 (1985.01)
Patent
CA 1200158
Abstract: Surface modified, skinless, hydrophilic, micro- porous, polyamide membranes are formed by preparing a casting solution comprised of (A) a casting resin system comprised of (a) an alcohol-insoluble poly- amide resin, and (b) a cationic, water-soluble, qua- ternary ammonium, thermosetting, membrane surface modifying polymer, and (B) a solvent system in which the casting resin system is soluble; inducing nuclea- tion of the casting solution by controlled addition of a nonsolvent for the casting resin system under controlled conditions to obtain a visible precipitate of casting resin system particles, thereby forming a casting composition; spreading the casting composi- tion on a substrate to form a thin film; contacting and diluting the film of the casting composition with a liquid nonsolvent system for the casting resin system, thereby precipitating the casting resin sys- tem from the casting composition in the form of a thin, skinless, hydrophilic, surface modified, micro- porous, polyamide membrane; and washing and drying the membrane. The membranes of this invention are characterized by having fine pore ratings, the sur- face properties thereof being substantially controlled by cationic, quaternary ammonium groups of a modifying polymer thereby providing a positive zeta potential in alkaline media, and for those with moderate or low levels of surface modifying polymer present, a time to reach an effluent resistivity of 14 megaohms/cm under the Resistivity Test of 10 minutes or less. They have greatly enhanced filtration efficiency over a broad pH range with a variety of contaminants, including very fine negatively charged particles, bacteria and endotoxins.
420888
Degen Peter J.
Gsell Thomas C.
Joffee Irving B.
Marks & Clerk
Pall Corporation
LandOfFree
Surface modified polyamide membrane does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface modified polyamide membrane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface modified polyamide membrane will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1193428