Membrane post treatment
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United States of America Patent
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Sep 11, 2012
Grant Date -
Dec 1, 2011
app pub date -
Aug 10, 2011
filing date -
Jul 8, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to polymeric ultrafiltration or microfiltration membranes of, for instance, poly(ethylene chlorotrifluoroethylene) (HALAR®), PVDF or PP, incorporating PVME or vinyl methyl ether monomers. The PVME may be present as a coating on the membrane or dispersed throughout the membrane or both. The membranes are preferably hydrophilic with a highly asymmetric structure with a reduced pore size and/or absence of macrovoids as a result of the addition of PVME. The PVME maybe cross-linked. The invention also relates to methods of hydrophilising membranes and/or preparing hydrophilic membranes via thermal or diffusion induced phase separation processed.
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