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Composite gas separation membrane having a gutter layer comprising a crosslinked polar phenyl-containing - organopolysiloxane, and method for making the same -

  • US 5,286,280 A
  • Filed: 12/31/1992
  • Issued: 02/15/1994
  • Est. Priority Date: 12/31/1992
  • Status: Expired due to Fees
First Claim
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1. A composite gas separation membrane comprising:

  • (A) a porous polyacrylonitrile structural support material having a polyacrylonitrile surface;

    (B) a gutter layer coating comprising a crosslinked polar phenyl-containing-organopolysiloxane material on the polyacrylonitrile surface of the structural support material, leaving an uncoated gutter layer surface; and

    (C) an ultrathin 6FDA-type polyimide selective membrane layer coating on the uncoated gutter layer surface.

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