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BREATHABLE, CHEMICAL RESISTANT, DURABLE, AND WATERPROOF COATED POROUS MEMBRANE

  • US 20100255741A1
  • Filed: 04/02/2009
  • Published: 10/07/2010
  • Est. Priority Date: 04/02/2009
  • Status: Active Grant
First Claim
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1. A waterproof, vapor-permeable and air-permeable sheet material including:

  • a waterproof microporous polymer substrate;

    a microporous thermoplastic coating layer attached to the polymer substrate, the thermoplastic coating layer being vapor-permeable and air-permeable; and

    the thermoplastic coating layer being at least partially interpenetrated into pores of the polymer substrate forming an interface that prevents passage of water droplets, while permitting passage of water vapor and air, when a chemical is present on the sheet material that would otherwise cause the polymer substrate to permit passage of water droplets.

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