Asymmetrical microporous hollow fiber for hemodialysis

Details Asymmetrical microporous hollow fiber for hemodialysis Asymmetrical microporous hollow fiber for hemodialysis

1988-04-29

1990-03-06

Lorin, Hubert C.

Liquid purification or separation

Filter

Material

21050027, 264 41, 264 49, 264561, 2642091, 26421116, 264233, 428398, D01D 5247, B01D 3916

Patent

active

049063758

ABSTRACT:
An asymmetric microporous hollow fiber for hemodialysis is made up of 90 to 99% by weight of a first hydrophobic polymer and 10 to 1% by weight of a second hydrophilic polymer. The fiber has a water adsorbing capacity of 3 to 10% and is produced by extruding a solution containing 12 to 20% by weight of the first polymer and 2 to 10% by weight of the second polymer, the rest being a solvent to give a continuous hollow structure with a wall, causing a precipitation liquor to act on said structure in an outward direction through the wall thereof with the full precipitation thereof and the concurrent dissolution and washing out of a part of said first polymer from said extruded structure and then washing out the dissolved out part of the pore-forming substance and the other organic components. Thereafter the fiber so produced is fixed in a washing bath.

REFERENCES:
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patent: 3763055 (1973-10-01), White et al.
patent: 3948823 (1976-04-01), Lee et al.
patent: 4051300 (1977-09-01), Klein et al.
patent: 4100238 (1978-07-01), Shinomura
patent: 4286015 (1981-08-01), Yoshida
patent: 4351860 (1982-09-01), Yoshida
patent: 4432875 (1984-02-01), Wrasidlo et al.
patent: 4545910 (1985-10-01), Marze

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