Patent ID: 7501363

Claim:
A composite laminate comprising: a coextruded cast film layer, wherein said cast film layer comprises at least three layers having different constituent parts, wherein at least two layers of said cast film are outer layers, said outer layers consisting of a polypropylene resin selected from the group consisting of polypropylene homopolymers and polypropylene copolymers, and wherein at least one layer of said cast film layer is a barrier layer sufficient to prevent blood, viruses and bacteria from passing through the cast film layer, said barrier layer consisting of a member selected from the group consisting of low density polyethylene and a blend of low density polyethylene and a linear low density polyethylene; and at least two nonwoven substrate layers adhesively laminated to said outer layers, said composite laminate being characterized by its high wet peel strength, improved barrier properties and its being ethylene oxide sterilizable, the high wet peel strength not being diminished but enhanced on aging of the composite laminate.