Fluid separation membranes prepared from blends of polyimide pol

Details Fluid separation membranes prepared from blends of polyimide pol Fluid separation membranes prepared from blends of polyimide pol

1995-03-14

1997-06-03

Spear, Frank

Liquid purification or separation

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Material

96 8, 21050039, B01D 6908

Patent

active

056350678

ABSTRACT:
Anisotropic fluid separation membranes having an integral discriminating layer are formed from blends of two types of polyimides. The first type is a phenylindane containing polyimide. The second type consists of polyimides formed from the reaction of benzophenone tetracarboxylic dianhydride (BTDA) and optionally pyromellitic dianhydride (PMDA), with toluene diisocyanate (TDI) and/or 4,4'-methylene-bis-phenylisocyanate (MDI). The ratio of Type 1 polymer to Type 2 polymer is 1 or less. The blend membranes are particularly useful for gas separation.

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