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Gas separation membrane with ultrathin layer

  • US 5,160,353 A
  • Filed: 08/30/1990
  • Issued: 11/03/1992
  • Est. Priority Date: 08/30/1990
  • Status: Expired due to Fees
First Claim
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1. A gas separation membrane comprising a thick polymer layer, and an ultrathin polymer layer, wherein:

  • said ultrathin layer is 10 to about 90 A thick; and

    provided that;

    the selectivity of the polymer of said ultrathin layer is higher than the selectivity of the polymer of said thick layer; and

    the selectivity of said membrane is greater or equal to the selectivity calculated for said thick layer, assuming said thick layer is defect-free.

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