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High flux semipermeable membranes

  • US 4,950,404 A
  • Filed: 08/30/1989
  • Issued: 08/21/1990
  • Est. Priority Date: 08/30/1989
  • Status: Expired due to Term
First Claim
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1. A semipermeable membrane having properties for providing increased flux while retaining salt rejection and chlorine resistance prepared by coating a porous support with an aqueous solution of an polyamine or bisphenol which contains a polar aprotic solvent not reactive with amines having properties for dissolving or plasticizing said support, removing excess of said solution, contacting the coated porous support with an organic solvent solution of an polyacyl halide, polysulfonyl halide, or polyisocyanate to form a reaction product within and/or on the surface of said porous support, and curing the resultant composite at curing conditions to form said high flux semipermeable membrane.

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