Gas separation membrane
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United States of America Patent
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Dec 10, 1991
Grant Date -
N/A
app pub date -
Aug 13, 1990
filing date -
Aug 11, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a gas separation membrane, comprising a film with a thickness ranging from 0.05.10.sup.-6 to 20.10.sup.-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which corresponds to the following formula (I): ##STR1## where A represents a tetravalent aromatic radical at least 50% by mole of which are represented by the following formula (II): ##STR2## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.
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