Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By treating occluded solids
Patent
1977-01-28
1978-09-19
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By treating occluded solids
264210F, 264211, 264344, B29H 720
Patent
active
041154924
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.-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.
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Mahoney Robert D.
Schneider Stephen E.
Stringham Robert R.
The Dow Chemical Company
Woo Jay H.
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