Process for producing micro-porous membrane of ultra-high-molecu

Details Process for producing micro-porous membrane of ultra-high-molecu Process for producing micro-porous membrane of ultra-high-molecu

1986-02-24

1988-03-29

Anderson, Philip

Liquid purification or separation

Filter

Material

264 41, 264 53, 264203, 264204, 2642102, 2642888, 2642893, 2642902, 521 64, 521142, C08J 928, B29C 5512, B29C 4300

Patent

active

047341963

ABSTRACT:
A micro-porous membrane of ultra-high-molecular-weight alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, the micro-porous membrane having through holes 0.01 to 1 micrometer in average pore size, with a void ratio from 30 to 90% and being oriented such that the linear draw ratio in one axis is greater than two and the areal draw ratio is greater than ten. The micro-porous membrane is obtained by forming a gel-like object from a solution of an alpha-olefin polymer having a weight-average molecular weight greater than 5.times.10.sup.5, removing at least 10 wt % of the solvent contained in the gel-like object so that the gel-like object contains 10 to 90 wt % of alpa-olefin polymer, orientating the gel-like object at a temperature lower than that which is 10.degree. C. above the melting point of the alpa-olefin polymer, and removing the residual solvent from the orientated product. A film is produced from the orientated product by pressing the orientated product at a temperature lower than that of the melting point of the alpha-olefin polymer.

REFERENCES:
patent: 4413110 (1983-11-01), Kavesh et al.
patent: 4536536 (1985-08-01), Kavesh et al.
patent: 4551296 (1985-11-01), Kavesh et al.

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