Process for making alkali resistant hyperfiltration membrane and resulting product
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United States of America Patent
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May 30, 1989
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N/A
app pub date -
Jan 8, 1987
filing date -
Jan 8, 1987
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Expired
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Abstract
A novel hyperfiltration membrane and process for making the same is described. The membrane is useful for processing copper electroless solutions to concentrate for re-use salts of chelating agents. The membrane can be prepared by crosslinking a water-compatible polymer in the presence of a phosphorus-containing acid, such as phosphoric acid, wherein the acid is present in a sufficient amount to catalyze crosslinking and to form a plurality of pores in the coating when dried.
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