C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/16, 204/91.4,
C08J 9/34 (2006.01) B01D 69/12 (2006.01) B01D 71/66 (2006.01) B32B 27/28 (2006.01) C08G 75/04 (2006.01) C08L 81/02 (2006.01)
Patent
CA 1289312
COMPOSITE SEMIPERMEABLE MEMBRANE ABSTRACT OF THE DISCLOSURE A composite semipermeable membrane is provided comprised of: (a) a flexible film of microporous hydrophobic material having a polar molecule vapour transmission rate in excess of 10,000 gms/m2 ? 24 hours, preferably above 100,000 gms/m2 ? 24 hours, and an advancing polar liquid contact angle exceeding 90 degrees, and (b) a continuous, crosslinked amorphous hydrophilic layer penetrated to an extent into the face of the hydrophobic layer. The hydrophilic layer, when appropriately located in the structure of the microporous hydrophobic material provides a composite membrane having a polar vapour transmission rate of the complete ensemble comparable to or even exceeding that of the hydrophobic material alone, and simultaneously offering two mechanisms of separation; that imposed by the microporous layer and that imposed by the continuous, dense amorphous polymer layer, and as such is capable of numerous separation operations.
479691
Gowling Lafleur Henderson Llp
W. L. Gore & Associates Inc.
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