Production of high porosity open-cell membranes
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United States of America Patent
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Issued Date -
May 3, 2007
app pub date -
Dec 6, 2006
filing date -
Jan 20, 2004
priority date (Note) -
Abandoned
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Abstract
The present invention is directed to methods of producing a symmetric, strong, highly porous, microporous polymer film by (a) forming a layer of a polymer solution on a substrate, the solution comprising two miscible liquids and a polymer material dissolved therein, and wherein the first liquid has a surface tension lower than the surface energy of the polymer and the second liquid has a surface tension greater than the surface energy of the polymer; (b) producing a film of gelled polymer from the layer of polymer solution; and (c) rapidly removing the liquid from the film of gelled polymer by unidirectional mass transfer without dissolving the gelled polymer.
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