Selectively permeable hollow fiber membrane and process for producing same

Abstract From the Canadian patent

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 …