POROUS HOLLOW FIBER FILTRATION MEMBRANE
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United States of America Patent
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Jan 19, 2016
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Jan 19, 2015
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Abstract
The present invention provides a porous hollow fiber filtration membrane comprising a polysulfone-based polymer and hydrophilic polymer, the porous hollow fiber filtration membrane including a gradient asymmetric structure in which the average pore diameter of fine pores increases from the outer surface toward the inner surface, a content of the hydrophilic polymer in the membrane is 6.0 to 12.0% by mass, and a ratio of the content of the hydrophilic polymer in the outer surface to the content of the hydrophilic polymer in the membrane is 1.20 to 1.60.
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