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US 4,961,985 AGranted
Fabrics for protective clothing
AssigneeW. L. Gore & Associates, Inc.
InventorsRobert L. Henn, Dilip J. Sakhpara, Christian E. Bailey, John J. Bowser, Peter L. Brown
Life of this patent
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Abstract
A coated product is provided that is comprised of a substrate and a coating comprised of a microporous scaffold material having a high void volume and open, interconnecting void microstructure, the scaffold material having a layer of a selected polyurethane thereon which extends in the voids. The coated product has good barrier properties with respect to bacteria, viruses, and air-borne particulate.
Claims34
A coated fabric consisting essentially of:
- (a) a substrate fabric having a moisture vapor transmission rate of at least 5000 gm/m.sup.2 /24 hrs;
- and;
- (b) a continuous coating on at least one side of said fabric comprising a polymeric, porous, scaffold material having a microstructure of open interconnected voids wherein the void volume of the scaffold material is at least 65% of the total scaffold material volume,
- said scaffold having a weight of between 1 and 10 grams per square meter;
- said scaffold having a layer of hydrophilic, polyurethane resin on one surface of the scaffold, which extends into a portion of the voids of the scaffold;
- said polyurethane layer having a weight of between 5 and 25 gm square meters;
- said article being a microorganism barrier such that it does not permit passage of viruses when challenged by the Virus Barrier Efficiency Test at 4 psig;
- and said article being an airborne particulate barrier such that is exhibits an air permeability less than 6 cc per minute;
- said fabric and coating arranged so that the polyurethane resin on the coating is adjacent the fabric.
6 more elements
Dependencies are inferred from the claim text.