Porous aramid membranes and emulsions useful for the casting thereof
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United States of America Patent
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Feb 13, 1990
Issued Date -
N/A
app pub date -
May 6, 1987
filing date -
Mar 14, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fully aromatic polyamide (aramid) resins can be cast into ultraporous and microporous membranes by forming a solution of the resin in an amount sufficient to cast a coherent membrane, diluting the solution with a liquid pore modifier which is a nonsolvent for the resin so as to produce a metastable dispersion of the resin, adding a precipitant to form a turbid casting dope, casting the dope onto a surface, and gelling the so-cast film.
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