| 摘要 |
A porous hollow fiber of polysulfone suitable for use in filtration such as microfiltration and having a prolonged life, the hollow fiber having an inner surface with a network structure such that approximately circular openings having a minor axial length of 0.1 to 10 mu m are present in proximity to each other at intervals of not more than the average minor axial length of the openings, thus providing a surface fraction of openings of 50 to 90% and/or an outer surface of a structure such that the outer surface region has undergone fibrillation to a high degree to form fibrils oriented in the fiber axial direction at intervals of 0.2 to 3 mu m, thus providing a surface fraction of openings of at least 50%. The hollow fiber is prepared by a process characterized in that a polymer substance having an extremely high molecular weight such as polyethylene glycol and polyvinyl pyrrolidone is added to the spinning solution of polysulfone, thereby improving the spinnability.
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