Hydrophobic polymeric membrane composites
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United States of America Patent
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Feb 15, 1994
Issued Date -
N/A
app pub date -
May 17, 1993
filing date -
Mar 17, 1992
priority date (Note) -
Expired
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Abstract
A composite porous membrane is formed from a porous polymeric substrate having its entire surface modified with a cross-linked polymer which results in a hydrophobic and oleophobic surface. The composite membrane retains substantially all of its other original properties. The cross-linked polymer is formed in situ on the polymeric substrate from a reactant system comprising an ethylenically unsaturated monomer having at least one fluoroalkyl group, a cross-linker, and, if needed, a polymerization initiator, dissolved in a nonpolar and or weakly polar solvent system. The membrane substrate saturated with the reactant system is exposed to a suitable energy source to effect polymerization and cross linking of the monomer.
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