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Porous membrane formed from interpenetrating polymer network having hydrophilic surface

  • US 5,158,721 A
  • Filed: 09/06/1991
  • Issued: 10/27/1992
  • Est. Priority Date: 11/30/1989
  • Status: Expired due to Fees
First Claim
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1. The process for forming a porous membrane having a water wettable surface formed of an interpenetrating polymer network of a semi-crystalline hydrophobic polymer, and a cross-linked hydrophilic second polymer which comprises:

  • (a) forming a solution of said hydrophobic polymer, a monomeric composition precursor of said hydrophilic polymer, a crosslinking agent for said monomeric composition and a photoinitiator for said monomer composition,(b) casting said solution on a substrate,(c) exposing said cast solution to ultraviolet radiation to polymerize and cross-link said monomeric composition,(d) coagulating said cast solution,(e) removing solvent from said coagulated solution to form a dried porous membrane, and(f) annealing said dried porous membrane to render the surface of said membrane water wettable.

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