Membranes and their manufacture
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United States of America Patent
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Aug 5, 2008
Grant Date -
Dec 2, 2004
app pub date -
Jun 26, 2002
filing date -
Jun 26, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Membranes comprising an aromatic ether ketone polymer (e.g. polyetherketone) in sheet or hollow fibre form are made by preparing at least a 12 wt % solution of the polymer in a solvent which is chemically inert to the polymer (e.g. concentrated sulphuric acid); forming a film of the solution in sheet or hollow form; and contacting the film with a non-solvent (e.g. more dilute sulphuric acid or acetic acid) thereby to precipitate the film.
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