Process for forming asymmetric gas separation membranes having graded density skins
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United States of America Patent
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Oct 3, 1989
Issued Date -
N/A
app pub date -
Jul 6, 1987
filing date -
Aug 15, 1986
priority date (Note) -
Expired
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Abstract
A process for forming high free volume, asymmetric gas separation membranes having graded density skins and macrovoid-free morphology from a solvent system comprising a Lewis acid, Lewis base, and a Lewis acid:base complex which dissolve hydrophobic polymers. The dopes have high total solids, high viscosity and low coagulation (g) values which enhance rapid gelation without the formation of macrovoids and which minimize densification. The dope solvent system complexes are readily disassociated by the coagulation medium and the component molecules are miscible in the medium which provides for rapid desolvation of the formed membrane thus providing a membrane having low residual solvent retention.
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