Polytetrafluoroethylene resin porous membrane, separator making use of the porous membrane and methods of producing the porous membrane and the separator
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
May 30, 1989
filing date -
Jul 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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