Liquid purification or separation – Filter – Material
Patent
1989-11-08
1990-06-05
Sever, Frank
Liquid purification or separation
Filter
Material
528310, B01D 1300
Patent
active
049311824
ABSTRACT:
The present invention is a class of polyimide membranes containing copolymerizable, surface modifiable units containing both aromatic diamines and alkenylated diamines having a vinyl or vinylaryl group preferably positioned ortho to an amine functionality. The polyimide membranes can be crosslinked by treatment with an activating force such as high energy electromagnetic irradiation or with a free radical source to impart high selectivity to the membrane without causing a large decrease in composite permeance.
REFERENCES:
patent: Re30351 (1980-07-01), Hoehn et al.
patent: 3822202 (1974-07-01), Hoehn
patent: 4378400 (1983-03-01), Mahano et al.
patent: 4657564 (1987-04-01), Langeam
patent: 4705540 (1987-11-01), Hayes
patent: 4717393 (1988-01-01), Hayes
patent: 4717394 (1988-01-01), Hayes
T. H. Kim et al., "Reverse Pemuii Active" of N.sub.2 Over CH.sub.4 in Aromatic Polyimides, Journal of Applied Polymer Paint, vol. 34, (1987) 1767-1771.
Burgoyne, Jr. William F.
Casey Jeremiah P.
Ford Michael E.
Langsam Michael
Air Products and Chemicals Inc.
Marsh William F.
Rodgers Mark L.
Sever Frank
Simmons James C.
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