Process for making microporous polyethylene hollow fibers

Details Process for making microporous polyethylene hollow fibers Process for making microporous polyethylene hollow fibers

1983-03-10

1985-07-23

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264235, 2642888, 264346, 428376, 428398, B29D 724

Patent

active

045308098

ABSTRACT:
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 (ml/m.sup.2, 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 it 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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