Fluorocarbon membranes and process for making fluorocarbon membranes
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United States of America Patent
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Feb 20, 1990
Grant Date -
N/A
app pub date -
May 4, 1988
filing date -
May 4, 1988
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Expired
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Abstract
Microporous poly (tetrafluoroethylene-co-perfluoro (alkyl vinyl ether)) (PFA) or poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) membrane or hollow fibers are formed from a melt blend of 10 to 35 weight percent of PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and cooled to effect phase separation of the PFA or FEP from the blend. The solvent is removed from the PFA or FEP by extraction and the porous PFA or FEP is dried under restraint to prevent shrinkage.
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