Vapor-permeable liquid-impermeable fabric

Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond


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427365, 427366, 4273899, 428290, 428341, 428913, B05D 302, B05D 312, B32B 700, B32B 2700




A process is provided for making a water-impermeable, vapor-permeable fabric. A lightweight continuous coating of polypropylene resin is applied to the surface of a fibrous sheet to make the sheet impermeable to water and vapor. Subsequent calendering provides vapor permeability to the sheet while maintaining liquid water impermeability. The resultant product is particularly suited for use as a roofing-tile underlayment or as an air-infiltration barrier.

patent: 3121657 (1964-02-01), Magill
patent: 3421960 (1969-01-01), Arbit
patent: 3501326 (1970-03-01), Hochberg et al.
patent: 3871910 (1975-03-01), Barkis et al.
patent: 3914479 (1975-10-01), Yamagata et al.
patent: 4029833 (1977-06-01), Kosta
patent: 4347844 (1982-09-01), Ohki et al.


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