Patent ID: 7157388
Filing Date: 2007-01-02
Classification: B32B,C08K,C08L,D06M,Y10T

Abstract:
1. A waterproof breathable composite fabric comprising an exterior fabric layer woven or knitted from yarns made from solution dyed acrylic, modacrylic and/or polyester fibers, said exterior fabric layer having an outer surface and an inner surface, and a nonporous water impermeable, moisture vapor permeable layer bonded to said inner surface of the exterior fabric layer, said moisture vapor permeable layer being a nonporous, monolithic layer formed from a blended resin comprising a multi-block copolymer including a repeating chain of soft and hard segments, wherein the multi-block copolymer comprises a blend of a first polyether ester resin which has polytetramethyleneoxide (PTMG) as the soft segment and butylene terepthalate (BTP) as the hard segment and a second polyether ester resin which contains a comonomer of polyethyleneoxide (PEO) and polypropyleneoxide (PPO) as the soft segment and butylene terephthalate (BTP) as the hard segment, and said nonporous water impermeable, moisture vapor permeable layer containing a combination of at least one UV absorber and a hindered amine UV light stabilizer to stabilize the nonporous water impermeable, moisture vapor permeable layer against UV degradation, and a discontinuous adhesive layer between said exterior fabric layer and said nonporous water impermeable, moisture vapor permeable layer bonding the moisture vapor permeable layer to said inner surface of the exterior fabric layer to form a durable waterproof breathable composite fabric.