04717394 is referenced by 113 patents and cites 45 patents.

Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with diamines having alkyl substituents on all ortho positions to the amine functions, or with mixtures of diamines, some components having substituents on all positions ortho to the amine functions, are disclosed. Membranes formed from this class of polyimides have improved environmental stability and superior gas permeability. The range of gas permeation properties observed allows for the tailoring of membrane material for widely diverse gas separations. The high permeabilities of some gases from multicomponent mixtures is due to the optimization of the molecular free volume in the polymer.

Title
Polyimide gas separation membranes
Application Number
6/923486
Publication Number
4717394
Application Date
October 27, 1986
Publication Date
January 5, 1988
Inventor
Richard A Hayes
Hockessin
DE, US
Assignee
E I Du Pont de Nemours and Company
DE, US
IPC
B01D 53/22
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