Selectively permeable hollow fiber membrane and process for...

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B01D 69/08 (2006.01) A61M 1/18 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/16 (2006.01)

Patent

CA 2202969

A selectively permeable hollow fiber membrane for blood dialysis consisting substantially of a cellulose derivative, which has at least a dense layer on the innermost side and a porous layer of greater void percentage on the outside, and a process for producing the selectively permeable hollow fiber membrane consisting substantially of a cellulose derivative, which comprises extruding a spinning solution containing a polymer consisting substantially of a cellulose derivative dissolved in an organic solvent, from an annular slit into a filamentous form, while simultaneously introducing a core material solution with a water content of at least 50 wt% into the extruded filamentous body, and then immersing the filamentous body into a coagulating solution after passing it through a gas.

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