Asymmetric gas separation membranes having improved strength

Details Asymmetric gas separation membranes having improved strength Asymmetric gas separation membranes having improved strength

1990-08-24

1991-02-12

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264561, 2642091, 264184, 26421115, 26421116, 264233, 264205, 21050023, 21050027, D01D 5247

Patent

active

049922211

ABSTRACT:
A dope for forming membranes and the resulting asymmetric gas separation membranes are disclosed, the membranes having graded density skins which exhibit improved permeability characteristics and increased failure pressure strength. The membranes are produced from a process utilizing membrane forming dopes of complexing solvent systems formulated from two non-solvents and one or more solvents. The non-solvents are chosen one each, from non-solvents grouped according to non-solvent strength, i.e., one strong non-solvent and one weak non-solvent which are combined with one or more solvents in an acid:base complex solvent system for dissolving high weight percent total solids of membrane forming polymers. The process for forming the membranes is also disclosed.

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