Process for charge modifying a microphorous membrane
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United States of America Patent
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Dec 8, 1987
Issued Date -
N/A
app pub date -
Sep 18, 1984
filing date -
Oct 27, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process is provided for for cationically charge modifying a microporous filter membrane, wherein the membrane is a substantially symmetrical isotropic, hydrophilic, organic polymeric microporous filter membrane, preferably nylon, having a microstructure throughout the membrane. The process comprises bonding a primary charge modifying amount of a water soluble cationic charge modifying agent to substantially all of the membrane microstructure, without substantial pore size reduction or pore blockage. The charge modifying agent is a reaction product of a polyamine with epichlorohydrin, the reactive product having (i) tertiary amine or quaternary ammonium groups, and (ii) epoxide groups along a polyamine chain, the epoxide groups capable of bonding to the microstructure of the membrane.
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