Separation membrane and method of preparing and using same
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United States of America Patent
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Jul 9, 1985
Grant Date -
N/A
app pub date -
Mar 23, 1984
filing date -
Mar 23, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A differential pore-collapsed separation membrane particularly useful as a gas-separation membrane and a method of preparing such differential pore-collapsed membrane, which method comprises treating an asymmetric membrane, while under one-sided constraint, with a treating solution comprising a volatile nonsolvent and a swelling agent and/or a solvent, and drying the treated membrane, to provide for the controlled, differential pore collapse of the small pores of the top skin of the membrane to a smaller pore-size distribution in the membrane generally less than about 10 Angstroms.
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