Method of making thin-film composite membranes
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United States of America Patent
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Oct 25, 1994
Issued Date -
N/A
app pub date -
Apr 27, 1993
filing date -
May 13, 1992
priority date (Note) -
Expired
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Abstract
A thin-film seimpermeable composite membrane employs the reaction product of N-alkyl phenylenediamine or N,N'-dialkyl phenylenediamine and a poly acyl halide, such as trimesoyl chloride. Preferably the membrane is post-treated with an acid solution followed by an aqueous solution of polyvinyl alcohol and a buffer and/or base to improve its physical properties.
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