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Modified membranes

  • US 6,884,350 B2
  • Filed: 05/12/2003
  • Issued: 04/26/2005
  • Est. Priority Date: 11/13/2000
  • Status: Expired due to Term
First Claim
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1. A porous polymeric membrane formed from a blend of a polymeric membrane forming material and an anhydride as a reactivity modifying agent adapted to modify at least one surface active property of the porous polymeric membrane relative to a porous polymeric membrane formed from the polymeric membrane forming material without said anhydride, comprising surface anhydride sites, wherein said surface anhydride sites are in a reacted form, wherein said surface anhydride sites are reacted with an amine to form an amide linkage, wherein said surface anhydride sites are reacted with a polyamine to form a crosslinked polyamide layer and, wherein said amine is selected from the group consisting of tetraethylenepentamine and tris-(hydroxymethyl) aminomethane.

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