Ultraporous and microporous membranes and method of making membranes
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United States of America Patent
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Dec 15, 1992
Grant Date -
N/A
app pub date -
Mar 26, 1991
filing date -
Mar 26, 1991
priority date (Note) -
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Abstract
Ultraporous and microporous polymer membranes cast from metastable dispersions are significantly improved by limiting the time of environmental exposure to less than about 0.5, preferably less than 0.25 seconds, between casting about 10.degree. to about 20.degree. C. lower than the usual prior art values. The resulting membranes have far less debris entrained in the membrane, far more consistent and uniform pore sizes, a substantially greater number of skin pores, and greatly increased flow rates for any given pore diameter.
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