Hydrophilic microporous membrane and process for preparing same

Details Hydrophilic microporous membrane and process for preparing same Hydrophilic microporous membrane and process for preparing same

B - Operations, Transporting

01

D

204/91.37, 117/8

B01D 69/08 (2006.01) B01D 67/00 (2006.01) C08J 9/40 (2006.01)

Patent

CA 1333236

A hollow fiber microporous membrane of a polyolefin having a polyvinyl alcohol chemically bonded to the inner and outer surfaces of the hollow fiber membrane and the surfaces defining the pores thereof exhibits a good hydrophilic property as well as good chemical resistance, mechanical strength, water permeation performance and durability. This membrane has an average pore diameter of 0.01 to 5 µm and a porosity of 20 to 80%. The polyvinyl alcohol/polyolefin composition ratio is constant in the membrane thickness direction of the hollow fiber, the oxygen/carbon atomic ratio X on the outer surface of the hollow fiber microporous membrane is 10 to 50%, and the condition defined by the ratio X/2 ? Y is satisfied between said oxygen/ carbon atomic ratio X and the oxygen/carbon atomic ratio Y in the entire microporous membrane. The membrane is prepared by irradiating a hollow fiber microporous membrane of a polyolefin with ionizing radiations, reacting the membrane with vinyl acetate and then hydrolyzing the membrane.

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