Hydrophobic membrane having hydrophilic and charged surface and process
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Jun 26, 1991
filing date -
Jun 26, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The surface of a hydrophobic porous substrate is modified with an interpolymeric network of a hydrophilic crosslinked polymer and a crosslinked-polyamine epichlorohydrin resin having fixed positive charges. The hydrophobic substrate is contacted with a reaction system comprising a solution of (a) monomer precursor to the hydrophilic polymer, a nonionic or cationic polymerization initiator and a crosslinking agent and (b) a precursor to the crosslinked positively charged resin. The monomer is polymerized and cross-linked by free radical polymerization followed by heating the contacted substrate to form the charged resin.
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