| 摘要 |
<p>: The invention provides a hollow fiber membrane suitable for dialysis made of a cellulose ester. The hollow fiber membrane has a membrane thickness of less than 20.mu., and a yield strength Sb (g/filament) after being heat-treated at 80.degree.C for 20 hours which satisfies the following formula (I): 0.90 < Sb/Sa < 1.10 (I) wherein Sa is the yield strength (g/filament) of the hollow fiber membrane measured before the heat treatment. The present invention further provides a method for producing the hollow fiber membrane which comprises extruding a spinning solution of a cellulose ester through circular slits around an inner tube of a spinneret while simultaneously extruding a core solution through the inner tube of the spinneret, passing the spinning solution extruded from the circular slits through a gaseous atmosphere, introducing the same into an aqueous coagulation bath, washing the coagulated hollow fibers, passing the fibers through a glycerin bath, drying the fibres, reeling the fibres onto a bobbin and then heat treating the reeled fibers. The membrane is suitable for the dialysis of body liquids, and particularly for the dialysis of blood, because it has good dialysis performance while maintaining good storage stability and good UFR retention during storage and during hemodialysis.</p> |
