Adhesive layer 26 contains at least one extrudable thermoplastic resin having a melting point ranging from about 100 to 200 degrees C. Thus, the thermoplastic resin may be a polyolefin resin such as polyethylene, polypropylene, copolymers of propylene/ethylene, copolymers of ethylene with alpha olefins, or copolymers of ethylene or propylene with a polar comonomer.