Microporous asymmetric polyfluorocarbon membranes

Details Microporous asymmetric polyfluorocarbon membranes Microporous asymmetric polyfluorocarbon membranes

1987-02-05

1989-09-05

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050036, 264 49, B01D 1300

Patent

active

048636045

ABSTRACT:
Novel microporous, asymmetric, integral, composite piolyfluorocarbon, e.g., polytetrafluoroethylene, membranes are disclosed. These membranes are made up of two or more sheets of microporous fluorocarbon polymer having different average pore sizes, arranged to provide an increasing gradations in average pore size from one surface of the membrane to the other, and are useful as microfilters for removing fine particle contaminants, including bacteria, from fluids such as those encountered in the electronics and pharmaceutical industries.

REFERENCES:
patent: 3342911 (1967-09-01), Funahashi
patent: 3930886 (1976-01-01), Mesiti et al.
patent: 4170540 (1979-10-01), La Zarz et al.
patent: 4478898 (1984-10-01), Kato
patent: 4588540 (1986-05-01), Kiefer et al.

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