1
Richard A Hayes: Polyimide gas separation membranes. E I Du Pont de Nemours and Company, January 5, 1988: US04717394 (113 worldwide citation)

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. Membr ...


2
Richard A Hayes: Polyimide gas separation membranes. E I Du Pont de Nemours and Company, November 10, 1987: US04705540 (103 worldwide citation)

A highly permeable aromatic polyimide gas separation membrane and the process of using it are disclosed. The aromatic polyimide has the formula ##STR1## wherein --Ar-- is ##STR2## or mixtures thereof, --X, --X.sub.1, --X.sub.2 and --X.sub.3 independently are alkyl groups having 1 to 6 carbon atoms o ...


3
Richard A Hayes: Polyimide gas separation membranes. E I Du Pont de Nemours and Company, January 5, 1988: US04717393 (97 worldwide citation)

Semi-flexible aromatic polyimides, prepared by polycondensation of dianhydrides with phenylene diamines having alkyl substituents on all ortho positions to the amine functions incorporating at least in part 3,3',4,4'-benzophenone tetracarboxylic dianhydride, are auto photochemically crosslinkable. M ...


4
Richard A Hayes: Polyimide gas separation membranes. E I Du Pont de Nemours and Company, Frank C Hilberg Jr, November 14, 1989: US04880442 (45 worldwide citation)

Aromatic polyimide gas separation membranes containing the repeating unit: ##STR1## where --Ar-- =is ##STR2## or mixtures thereof, ##STR3## or mixtures thereof Where --X, X.sub.1, X.sub.2, and X.sub.3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ...


5
Richard A Hayes: Polyimide gas separation membranes. E I Du Pont De Nemours and Company, June 13, 1989: US04838900 (41 worldwide citation)

Aromatic polyimide gas separation membranes of the formula: ##STR1## or mixtures thereof, --R'--is ##STR2## linear alkylene groups of the formula (CH.sub.2).sub.1-3 or mixtures thereof, where --R" is ##STR3## are independently primary or secondary alkyl groups having 1 to 6 carbon atoms preferably m ...


6
Mark G Weinberg: Polyimide gas separation membranes for carbon dioxide enrichment. E I du Pont de Nemours and Company, L Air Liquide, August 10, 1993: US05234471 (29 worldwide citation)

Aromatic polyimide membranes have superior flux at low temperature for carbon dioxide and other condensable gases. Superior flux is achieved without reduction in selectivity or other valuable properties of prior art membranes.


7
Okan M Ekiner, Richard A Hayes: Phenylindane-containing polyimide gas separation membranes. E I Du Pont de Nemours and Company, Craig H Evans, May 14, 1991: US05015270 (29 worldwide citation)

A permselective polyimide membrane having phenylindane residues incorporated into the polyimide backbone chain exhibiting high selectivity while maintaining good gas permeation rates and a process for using.


8
Okan M Ekiner, Richard A Hayes: Production of aromatic polyimide membranes. E I Du Pont de Nemours and Company, L Air Liquide, Craig H Evans, January 8, 1991: US04983191 (25 worldwide citation)

A process of producing a polyimide gas separation membranes comprising adding an oligomeric or polymeric aromatic epoxy resin to the dope solution, the resin being soluble in the polyimide or polyamic acid precursor, the solvent and the final membrane and the membrane comprising a blend of the polyi ...


9
Thomas O Jeanes, John D Summers, Edgar S Sanders Jr: Novel alicyclic polyimide gas separation membranes. The Dow Chemical Company, January 29, 1991: US04988371 (23 worldwide citation)

This invention relates to novel polyimide gas separation membranes derived from alicyclic dianhydrides and aliphatic, alicyclic, or aromatic diamines, and a process for using such membranes.


10
Hayes Richard Allen: Polyimide gas separation membranes.. Du Pont, October 21, 1987: EP0241937-A2 (20 worldwide citation)

A highly permeable aromatic polyimide gas separation membrane and the process of using it are disclosed. The aromatic polyimide has the formula wherein -Ar- is , or mixtures thereof, -X, -X1, -X2 and -X3 independently are alkyl groups having 1 to 6 carbon atoms or aromatic groups having 6 to 13 carb ...