Asymmetric fluoropolymer-coated polyolefin hollow fibers

Details Asymmetric fluoropolymer-coated polyolefin hollow fibers Asymmetric fluoropolymer-coated polyolefin hollow fibers

1992-01-08

1993-05-25

Sever, Frank

Liquid purification or separation

Filter

Material

55158, 21050036, 264 451, B01D 7132

Patent

active

052136892

ABSTRACT:
Asymmetric hollow fibers having a microporous hollow fiber core comprising a polyolefin, e.g. polypropylene, and an asymmetric coating comprising a fluoropolymer, e.g. SIXEF.TM.-Durene. Optionally, the coating may also comprise glycerine which is applied prior to the fluoropolymer. The fibers are coated by wet-spinning, or alternately by dry jet-wet spinning, through a spinning jet in which a fluoropolymer-containing fluid is applied to the outer surface of the fibers as they pass through the jet. The fibers exit the jet into a water bath. If greater selectivity is needed, the fiber later may be coated with an additional layer of a highly selective material, e.g. polyvinyl alcohol, PVP, and the like.

REFERENCES:
patent: 4230463 (1980-10-01), Henis et al.

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