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Waterproof breathable polyurethane membranes and porous substrates protected therewith

  • US 5,239,036 A
  • Filed: 01/11/1993
  • Issued: 08/24/1993
  • Est. Priority Date: 07/16/1992
  • Status: Expired due to Fees
First Claim
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1. A waterproof, water vapor transmissible non-porous polyurethane membrane comprising the reaction product of:

  • (a) an organic polyisocyanate,(b) a polyalkylene ether glycol wherein the number of carbon atoms of the alkylene radical thereof is 2;

    (c) at least one polyalkylene ether glycol wherein the number of carbon atoms of the alkylene radical thereof is at least 3; and

    (d) an isocyanate reactive hydroxyl group-containing polydimethylsiloxane having a functionality of at least 2;

    the mole ratio of the polyalkylene ether glycol of (a) to the at least one polyalkylene ether glycol of (b) being within the range of from 1.5;

    0.5 to 0.5;

    1.5 and the mole ratio of said isocyanate reactive polydimethylsiloxane to the total of said polyalkylene ether glycols of (b) and (c) being with the range of from 0.1;

    1 to 0.3;

    1.

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