Patent ID: 8617677

Claim:
A multilayer structure comprising a heat sealable layer, a pressure-sensitive adhesive layer, a tie layer, a structure layer, and optionally an additional tie layer wherein the heat sealable layer comprises amorphous polyethylene terephthalate having a melting temperature above 200Â° C. and is a semi-aromatic polyethylene terephthalate; the tie layer comprising a polymer composition having a melting temperature of about 80 to about 120Â° C. wherein one face of the tie layer is in direct contact with the pressure-sensitive adhesive layer and the other face of the tie layer is in direct contact with the structure layer; the structure layer comprises an ethylene homopolymer, ethylene Î±-olefin copolymer, propylene homopolymer, propylene Î±-olefin copolymer, polyethylene terephthalate, metallized polyethylene terephthalate, oriented polypropylene, oriented polyamide, polyvinyl chloride, polyacrylonitrile, paper, foil, non-woven fabric, or combinations thereof; and wherein at least one of the compositions of the heat sealable layer or the structure layer has a melting point significantly higher than the degradation temperature of the pressure sensitive adhesive; the pressure-sensitive adhesive layer is characterized by cohesive failure when the multilayer structure is subjected to a peel force of less than or equal to about 11 N/cm; and one face of the additional tie layer, if present, is in direct contact with the heat sealable layer and the other face of layer the additional tie layer is in direct contact with the pressure-sensitive adhesive layer.