Liquid purification or separation – Filter – Material
Patent
1993-09-02
1995-07-18
Dawson, Robert A.
Liquid purification or separation
Filter
Material
21050027, 21050023, 21050042, 210490, 210506, 21050039, 264 48, 264 49, 427245, B01D 3900
Patent
active
054338522
ABSTRACT:
A modified polyvinyl chloride (PVC) separation membrane and a method for its preparation. The membrane has improved water permeability, contamination resistance, and hydrophilic properties. The method comprises contacting a PVC membrane with a treating solution containing a compound having an amino functional group, preferably in the presence of an alkali alcoholate catalyst, and heat-treating the PVC membrane at elevated temperature. The membrane can be dipped in the treating bath at high temperature or dipped in solution at room temperature and heat-treated after removal from the treating bath.
REFERENCES:
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patent: 5019261 (1991-05-01), Stengaard
patent: 5283288 (1994-02-01), Boden et al.
F. Vigo et al., "Poly(Vinyl Chloride) Ultrafiltration Membranes Modified by High Frequency Discharge Treatment," Journal of Membrane Science, 36 (1988) 187-199.
F. Vigo et al., "Ultrafiltration Membranes Obtained by Poly(Acrylonitrile) Grafted onto Poly(Vinylchloride)," Desalination, 70 (1988), 277-292.
F. Vigo et al., "Ultrafiltration Membranes Obtained by Chemical Modification of Poly(Vinyl Chloride)," Synthetic Polymeric Membranes, (1987), 203-212.
C. Friedrich et al., "Asymmetric Reverse Osmosis and Ultrafiltration Membranes Prepared from Sulfonated Polysulfone," Desalination, 36 (1981), 39-62.
Chiao Tze-Chiang
Chou Chin-Chih
Tseng Tsai-Wie
Dawson Robert A.
Fortuna Ana M.
Industrial Technology Research Institute
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