Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1987-10-14
1989-05-09
Sever, Frank
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
21050037, 264DIG48, 264DIG62, B01D 1300
Patent
active
048287733
ABSTRACT:
An anisotropic elastomeric membrane preferably made from polyurea/urethane has been prepared. These anisotropic membranes are made from the corresponding polymeric material by preparing the polymeric material in a good solvent containing less than 5 vol % non-solvent, producing a film of the polymer solution on a support with a maximum pore size less than 20 microns, subjecting the film to conditions such that the solvent vapor pressure-time factor is 1000 mm Hg-min. or less, preferably 200 mm Hg-min or less, most preferably approaching 0 mm Hg-min and quenching the membrane film in a non-solvent yielding a three-layered anisotropic membrane.
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Feimer Joseph L.
Koenitzer Bernd A.
Schucker Robert C.
Allocca Joseph J.
Exxon Research and Engineering Company
Sever Frank
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