Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1989-05-09
1991-05-28
Spear, Frank
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
21050042, 21050029, B01D 6912
Patent
active
050192612
ABSTRACT:
Permeable, porous polymeric membrane with hydrophilic character of the membrane, said character being obtained by treatment with a solution comprising one or more hydrophilic, mono- or polymeric compounds selected among soluble, OH-containing cellulose derivatives, polyvinylalcohols and low molecular weight, polyfunctional, NH- and/or OH-containing compounds, optionally in the presence of a cross-linking agent, a surfactant and a initiator followed by rendering the layer deposited during the treatment insoluble on the membrane surface by means of a catalyst reaction at elevated temperatures in order to fixate the hydrophilic material to the membrane. Furthermore a process for the preparation of these membranes by means of treating a permeable, porous, polymeric membrane of hydrophobic character with the above solution in the presence of a catalyst and optionally in the presence of a cross-linking agent, a surfactant and an initiator, and curing of the coated membrane by means of heating to form an insoluble, hydrophilic surface layer. The membranes are suitable for use in ultra- and microfiltration.
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Dow Danmark A/S
Spear Frank
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