Inter-penetrating network charge modified microporous membrane

Details Inter-penetrating network charge modified microporous membrane Inter-penetrating network charge modified microporous membrane

1993-02-12

1994-01-11

Spear, Frank

Liquid purification or separation

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Material

210651, B01D 7168

Patent

active

052778126

ABSTRACT:
Hydrophilic inter-penetrating network charge modified microporous membranes are provided as well as a method of preparing the membranes by casting a membrane matrix blend containing matrix polymer, a solvent system, a wetting polymer compatible with the matrix polymer, and a charge modified system which forms a cross-linked inter-penetrating network structure within the microporous membrane substrate during the membrane fabrication process which network structure optionally can be locked in by heat curing. The membranes are useful for filtering ultra pure water with 18 megaohm-cm resistivity for the electronic industry, and they can also be used for the removal of a variety of contaminants from fluid media, such as very fine negatively charged particles, bacteria and endotoxins, with greatly enhanced filtration efficiency.

REFERENCES:
patent: 4007113 (1977-02-01), Ostreicher
patent: 4473474 (1984-07-01), Ostreicher
patent: 4473475 (1984-09-01), Barnes
patent: 4673504 (1987-06-01), Ostreicher
patent: 4708803 (1987-11-01), Ostreicher
patent: 5151189 (1992-09-01), Hu

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