Patent ID: 6492012
Filing Date: 2002-12-10
Classification: B32B,D06N,Y10T

Abstract:
A polymer coated porous product, comprising:at least one porous substrate; and a polymer coating penetrating the porous substrate in an amount sufficient to entangle the polymer coating within the porous substrate and resulting in a film on the porous substrate, and with said coating having been formed on the substrate through heating to a temperature above its vicat softening point, and below its melting point, at which it becomes tacky, and continuous extrusion vacuum lamination of a polymer film onto the porous substrate, which results in the polymer coating being entangled within the porous substrate, with pores in the product being small enough to prevent water penetration and larger than a molecule of water to prevent penetration of water and allow air and water vapors to migrate through the product.