Charge modified microporous membrane
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United States of America Patent
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Jun 16, 1987
Issued Date -
N/A
app pub date -
Sep 11, 1984
filing date -
Oct 27, 1980
priority date (Note) -
Expired
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Abstract
A cationic charge modified microporous membrane comprising a hydrophilic organic polymeric microporous membrane and a cationic charge modifying agent bonded to substantially all of the wetted surfaces of the membrane, the charge modifying agent being an epichlorohydrin modified polyamide having tertiary amine or quaternary ammonium groups. A secondary charge modifying agent may be employed selected from: (i) aliphatic polyamines having at least one primary amine or at least two secondary amines; and (ii) aliphatic amines having at least one secondary amine and a carboxyl or hydroxyl substituent. Processes for producing and using the membrane are also described.
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