B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/15
B01D 69/08 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 71/26 (2006.01) D01D 5/24 (2006.01)
Patent
CA 1271907
ABSTRACT OF THE DISCLOSURE A porous, annular, polyolefin, fiber membrane of 150 to 300 µm inside diameter and 10 to 150 µm wall thickness, having on the inner wall side thereof a tight layer of intimately bound fine polyolefin particles and on the outer wall side thereof a porous texture of fine polyolefin particles bound in chains and containing fine pores extending continuously from the inner wall side to the outer wall side. The membrane is formed by mixing a polyolefin, an organic filler uniformly dispersible in the polyolefin under conditions capable of melting the polyolefin and readily soluble in an extractant to be used, and a crystal seed forming agent; discharging the resultant mixture in a molten state through an annular spinning orifice and, at the same time, introducing an inert gas into the hollow center of the discharged tube of the mixture: advancing the discharged tube into contact with a cooling and solidifying liquid incapable of melting the polyolefin thereby cooling and solidifying the tube; and subsequently bringing the cooled and solidified tube into contact with an extractant incapable of disolving the polyolefin, thereby extracting the organic filler out of the tube.
492621
Emi Makoto
Ichikawa Toshiji
Seita Yukio
Shimoda Kazuhiro
Takahara Kazuaki
Macrae & Co.
Terumo Kabushiki Kaisha Trading As Terumo Corporation
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