Semi-permeable membranes prepared via reaction of cationic groups with nucleophilic groups
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United States of America Patent
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Jan 10, 1989
Issued Date -
N/A
app pub date -
Aug 17, 1987
filing date -
Oct 22, 1985
priority date (Note) -
Expired
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Abstract
A novel composite membrane and methods of making the membrane are described. The discriminating layer of the membrane is prepared by reaction of a reactive cationic compound group with a compound bearing a nucleophilic moiety. At least one of the reactants bears an average of two or more reactive groups. The reaction product contains covalent bonds formed via charge eliminating reactions. In a preferred embodiment of the invention, the nucleophilic group is anionic and a coacervate is formed initially on a microporous substrate. The resulting membrane may be useful for reverse osmosis, gas or ultrafiltration separations.
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