C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/16
C08J 9/36 (2006.01) B01D 69/00 (2006.01) B29C 55/12 (2006.01) B29C 55/28 (2006.01) C08J 9/00 (2006.01)
Patent
CA 1249406
ABSTRACT OF THE DISCLOSURE A process for preparing a porous, asymmetric membrane which comprises extruding a liquified film-forming polymer through an annular die to form a tubular film having an internal surface (A) and an external surface (B), said liquified polymer being ob- tained by use of a polymer solvent alone or in conjunction with one or more melt assistant; biaxially orientating said film while exposing said film to vaporous conditions such that said two sur- faces (A) and (B) each receive vapor treatments which differ from one another in at least one condition of temperature chemical com- position to provide one dense biaxially oriented surface and one less dense, porous surface. Such a porous, asymmetric polymer membrane having two surface one of which is denser than the other, said surfaces being biaxially oriented said membrane exhibiting a porosity gradient across its thickness with void spaces generally decreasing in at least one of size and number in the direction of the denser surface, and the density of said denser surface being such that the permeability/impermeability characteristics effect chemical separations.
468766
American Cyanamid Company
Smart & Biggar
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