MICROPOROUS COATINGS

摘要

Water-vapor-permeable yet waterproof coated fabrics are prepared by applying a polyurethane resin solvent solution to a base fabric then immersing the coating to coagulate the resin leaving a thin, microporous coating on the fabric. An acrylic acid thickener system is included in the resin solution to provide a microporous coating having moisture vapor transmission rates of at least 600 g/m<2>/24 hours and hydrostatic pressure resistance of at least 69 kPa. The resin solution may contain a bioactive silyl quaternary ammonium compound to impart laundry-durable antimicrobial properties to the coating and/or a hindered amine ultraviolet stabilizer to protect the coating from degradation caused by ultraviolet light and/or a flame retardant to render the coated fabric resistant to flame.