Polytetrafluoroethylene resin porous membrane, separator making

Details Polytetrafluoroethylene resin porous membrane, separator making Polytetrafluoroethylene resin porous membrane, separator making

1989-05-30

1992-10-27

Spear, Frank

Liquid purification or separation

Casing divided by membrane into sections having inlet

Membrane secured with adhesive of specified composition

210450, 21050036, 21050023, B01D 6908

Patent

active

051586800

ABSTRACT:
Disclosed are a porous membrane which is made from a material containing, as its main component, a polytetrafluoroethylene resin, and a method of producing a porous membrane comprising forming a hollow or sheet-like film from a mixture of a polytetrafluoroethylene resin dispersion and a fiber-forming polymer, heat-treating the film at a temperature not lower than the melting temperature of the resin, and removing the fiber-forming polymer. Production of polytetrafluoroethylene porous membranes of a variety of pore sizes and porosities is possible by suitably varying the type and amount of additives added to an original liquid. The membrane finds spreading use in the field of separation in high-temperature and strong decomposing or strong dissolving mediums.

REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4049589 (1977-09-01), Sakane
patent: 4096227 (1978-06-01), Gore
patent: 4154688 (1979-05-01), Pall
patent: 4269712 (1981-05-01), Hornby et al.
patent: 4770778 (1987-11-01), Yokoyama et al.
patent: 4874516 (1984-10-01), Kondo

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