Gas separation membrane
First Claim
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1. A gas separation membrane comprising at least one film of a thickness ranging from 0.05.10-6 to 20.10-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which has formula (I):
- ##STR12## where A represents a tetravalent aromatic radical, at least 50% by mole of which have formula (II);
##STR13## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.
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Abstract
Disclosed is a gas separation membrane, comprising a film with a thickness ranging from 0.05.10-6 to 20.10-6 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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Citations
10 Claims
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1. A gas separation membrane comprising at least one film of a thickness ranging from 0.05.10-6 to 20.10-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which has formula (I):
- ##STR12## where A represents a tetravalent aromatic radical, at least 50% by mole of which have formula (II);
##STR13## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- ##STR12## where A represents a tetravalent aromatic radical, at least 50% by mole of which have formula (II);
Specification