Microporous polyethylene hollow fibers and a process for...

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D01D 5/247 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 71/26 (2006.01) D01D 5/24 (2006.01)

Patent

CA 1168811

MICROPOROUS POLYETHYLENE HOLLOW FIBERS AND A PROCESS FOR PREPARING THE SAME ABSTRACT OF TEE DISCLOSURE Porous hollow fibers composed of a high density polyethylene the fibers having rectangular micropores that are oriented in the lengthwise direction of the fibers and-having a porosity from 30 to 90% by volume are disclosed. Membranes composed of hollow fibers exhibit a water permeability of greater than 65 (m1/m2, hr, mmHg) as well as a human serum albumin permeability of greater than 30%. Such fibers are suited for use as filters, particularly as a membrane for simple fractionation of whole blood into its plasma and cellular components. The hollow fibers are obtained by spinning a high- density polyethylene under a high-draft condition followed by cold stretching and hot stretching, and without the use of any solvent or plasticizer. .

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