Patent ID: 7799431

Claim:
A composite laminated structure comprising: a nonwoven substrate; a liquid impermeable, moisture vapour permeable layer or film formed on said nonwoven substrate, wherein said layer or film further comprises a thermoplastic hydrophilic polymeric composition comprising: from about 30% to about 55%, by weight of a thermoplastic hydrophilic polymer or a mixture of thermoplastic hydrophilic polymers selected from the group consisting of polyurethanes, poly-ether-amide block copolymers, polyester-amide block copolymers, polymers and copolymers of polyethylene oxide, polymers and copolymers of lactide, and (co)polyamides, (co)polyesters, polyester block copolymers, sulfonated polyesters, poly-ether-ester block copolymers, poly-ether-ester-amide block copolymers, polyacrylates, polyacrylic acids and derivatives, polyethylene-vinyl acetate with a vinyl acetate content of at least 28% by weight, polymers and copolymers of vinyl ethers, poly-2-ethyl-oxazoline and derivatives, polymers and copolymers of vinyl pyrrolidone, thermoplastic cellulose derivatives, poly glycolide, polyureas, and mixtures thereof; from about 5% to about 35%, by weight of said thermoplastic hydrophilic polymeric composition of a functionalized copolymer or a blend of functionalized copolymers containing functional groups capable of interacting with said thermoplastic hydrophilic polymer or mixture of thermoplastic hydrophilic polymers; and from about 15% to about 70%, by weight of said thermoplastic hydrophilic polymeric composition, of a suitable compatible plasticiser, or a blend of suitable compatible plasticizers, wherein said functionalized copolymer or said blend of functionalized copolymers is selected from the group consisting of ethylene-(meth)acrylic acid copolymers, ethylene acrylic ester copolymers, ethylene methacrylic ester copolymers, ionomers, ethylene-vinyl ester-(meth)acrylic acid copolymers, ethylene-acrylic ester-(meth)acrylic acid copolymers, ethylene-vinyl ester-maleic anhydride copolymers, ethylene-acrylic ester-maleic anhydride copolymers, ethylene-vinyl ester-glycidyl methacrylate copolymers, ethylene-acrylic ester-glycidyl methacrylate copolymers, ethylene-maleic anhydride copolymers, ethylene-glycidyl methacrylate copolymers, styrene-maleic anhydride copolymers, styrene glycidyl methacrylate copolymers, styrene-ethylene-butylene-maleic anhydride copolymers, and mixtures thereof, wherein said layer or film comprising the thermoplastic hydrophilic polymeric composition has an elastic modulus G′ 25 from higher than 800,000 Pa to 5,900,000 Pa, and wherein said functionalized copolymer or said blend of functionalized copolymers is selected from the group consisting of copolymers of ethylene with comonomers containing said functional groups.