Hydrophilic sulfonated polyolefin porous membrane and process fo

Details Hydrophilic sulfonated polyolefin porous membrane and process fo Hydrophilic sulfonated polyolefin porous membrane and process fo

1980-10-06

1983-10-11

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 27, 521 33, 521145, C08F11000, C08F 836, B01J 4712

Patent

active

044093390

ABSTRACT:
A sulfonated polyolefin porous membrane containing sulfonic groups in an amount, in terms of exchange capacity, of 0.05 to 1 milliequivalent per gram of the sulfonated polyolefin and having a porosity of 30 to 85% and an average pore diameter of 0.05 to 1.mu. has been found to be excellent in water permeability, removal capability, water-permeability retention, mechanical strength and elongation, etc. The porous membrane of the present invention may advantageously be employed as a fine microfilter or the like. The porous membrane of the present invention may be easily prepared by treating with a sulfonating agent a polyolefin porous membrane preferably containing an inorganic filler which is subsequently extracted from the membrane.

REFERENCES:
patent: 3375208 (1968-03-01), Duddy
patent: 3821127 (1974-06-01), Mizutani
patent: 4256845 (1981-03-01), Morris et al.
patent: 4265959 (1981-05-01), Sano et al.

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