Porous composite membrane

  • US 9,457,322 B2
  • Filed: 04/12/2010
  • Issued: 10/04/2016
  • Est. Priority Date: 04/13/2009
  • Status: Active Grant
First Claim
Patent Images

1. A filter member, comprising:

  • an upstream layer of polymeric nanofibers overlying an asymmetric microporous membrane, the asymmetric microporous membrane comprising ultra high molecular weight polyethylene and having a size rating of less than 0.1 microns, the filter member having;

    a) a liquid pressure drop in a test liquid that is less than a liquid pressure drop of the asymmetric microporous membrane in the test liquid or b) a liquid pressure drop in a test liquid that is within 15% of a liquid pressure drop of the asymmetric microporous membrane in the test liquid, wherein the test liquid is water or an organic liquid or comprises between 0.1% (weight/weight) and 0.3% (weight/weight) surfactant in water; and

    a particle retention under sieving conditions for test particles that is greater than a particle retention under sieving conditions of the asymmetric microporous membrane for the test particles.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×