Microporous polyethylene hollow fibers and process of preparing

Details Microporous polyethylene hollow fibers and process of preparing Microporous polyethylene hollow fibers and process of preparing

1975-10-03

1977-04-26

Kendell, Lorraine T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

55 16, 55527, 210500M, 264 49, 264210F, B01D 4700, B01D 5910, D02G 300

Patent

active

040202305

ABSTRACT:
Normally hydrophobic, polyethylene hollow fibers having contiguous microporosity are prepared by extruding a heated solution of a polyethylene and an ester from a hollow fiber spinnerette, simultaneously cooling and drawing the forming fibers to a ratio of up to 40 to 1, drawing the gelled fibers to an overall ratio of from about 1.5/1 to 800/1 and then removing the ester. The maximum pore radius ranges up to about 50A, and the fibers have gas permeabilities approaching 10.sup.-.sup.2 cc (STP) per cm.sup.2 per second per cm. Hg. transmembrane pressure differential. A significant increase in permeability over polyethylene hollow fibers made according to the teachings of the prior art is achieved.

REFERENCES:
patent: 3423491 (1969-01-01), McLain et al.
patent: 3798185 (1974-03-01), Skiens

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