Dried porous acrylonitrile polymer membrane, process for producing same and separators made therefrom
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United States of America Patent
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Feb 17, 1981
Issued Date -
N/A
app pub date -
May 9, 1979
filing date -
Sep 8, 1976
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is dried porous membrane composed of acrylonitrile polymer walls separating predominantly interconnecting small-size pores. The membrane has surface layers integrated with a support layer to form a single continuous acrylonitrile polymer phase. At least one of the surface layers has pores of from 0.001 to 0.05 micron in average size, and the support layer has pores which are on the average larger than the pores in the surface layer or layers. The membrane has a porosity of from 20% to 70% by volume and a fragility of below 30. The membrane exhibits improved mechanical properties.
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