Modification of polyvinylidene fluoride membrane and method of filtering
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United States of America Patent
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Jul 2, 1996
Grant Date -
N/A
app pub date -
Jul 7, 1994
filing date -
Jul 7, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing a positively charged organic phosphonium compound grafted to the membrane in a concentration sufficient to provide a surface of said membrane with a positive charge such that there is minimal susceptibility to the extraction of said polymer. The polymer may also contain an acrylate or methacrylate. There is also provided a method for ultrapurifying a liquid and an ultrapurifying system for water.
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