Copolyimide gas separation membranes derived from substituted methylene dianilines and unsubstituted diamines
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United States of America Patent
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Jun 12, 1990
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N/A
app pub date -
Jun 1, 1989
filing date -
Jun 1, 1989
priority date (Note) -
Expired
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Abstract
Semiflexible aromatic polyimides for preparing gas separation membranes and the process of using to separate at least one gas from a mixture of gases is disclosed. The aromatic polyimides are prepared by polycondensation of aromatic tetracarboxylic dianhydrides with 20 to 80 mol percent of a methylene dianiline which is alkyl substituted on all positions ortho to the amine functions. The remaining diamine constituent is not so substituted.
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