Liquid purification or separation – Filter – Material
Patent
1992-11-18
1993-08-03
Foelak, Morton
Liquid purification or separation
Filter
Material
21050041, 264DIG8, 264173, 521 64, 521189, B01D 6302, B01D 6508
Patent
active
052325970
ABSTRACT:
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 of 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.
REFERENCES:
patent: 5026479 (1991-06-01), Biksou et al.
patent: 5085676 (1992-02-01), Ekiner et al.
patent: 5104535 (1992-04-01), Cote et al.
Foelak Morton
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
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