B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
18/23
B01D 67/00 (2006.01) A61M 1/16 (2006.01) B01D 69/02 (2006.01) B01D 69/06 (2006.01) B01D 71/26 (2006.01) C08J 9/26 (2006.01) C08J 9/28 (2006.01)
Patent
CA 1312429
ABSTRACT OF THE DISCLOSURE A porous membrane for use in the separation of blood components, made of a polyolefin having a wall thickness in the range of 10 to 500 µm, and possessing through holes having an average diameter of 0.01 to 5 µm at a porosity in the range of 10 to 85%. The porous membrane has a shrinkage of not more than 6.0% in a heat treatment carried out at 121°C for 20 minutes. A method for the manufacture of the porous membrane comprises: mixing the molten polyolefin, an organic filler uniformly dispersible in the polyolefin and a crystal seed-forming agent; discharging the resultant molten mixture through a die; solifying the discharged molten membrane by cooling; and bringing into contact the solidified membrane with an extractant incapable of dissolving the polyolefin, thereby stripping from the membrane the organic filler by extraction; and fixing the produced polyolefin membrane in a prescribed length and subjecting the membrane to a heat treatment at a temperature 20 to 50°C lower than the melting point of the polyolefin.
516732
Onishi Makoto
Seita Yukio
Macrae & Co.
Terumo Kabushiki Kaisha Trading As Terumo Corporation
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