Preparation of asymmetric polyethylene hollow fiber membrane
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United States of America Patent
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Apr 29, 2008
Grant Date -
Mar 1, 2007
app pub date -
Aug 24, 2005
filing date -
Aug 24, 2005
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Abstract
A porous polyethylene hollow fiber membrane having a pore-size gradient across the inner and outer surfaces thereof is prepared by introducing, during the cooling step of a melt-spun polyethylene hollow fiber, a nitrogen flow and a solvent having a boiling point in the range of 30 to 80.degree. C. to the inner and outer surfaces of the melt-spun hollow fiber, respectively.
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