Patent ID: 7862887

Claim:
A co-extruded multilayer film comprising: (a) an extruded sealable outer layer comprising at least one ethylene-methacrylic acid copolymer and at least one of (i) a zinc salt of an ethylene-methacrylic acid copolymer, or (ii) a sodium salt of an ethylene-methacrylic acid copolymer; (b) an extruded first heat-resistant layer comprising high density polyethylene or polypropylene; (c) an extruded core layer comprising at least one polyolefin polymer; and (d) an extruded second heat-resistant layer comprising at least one heat-resistant polyolefin polymer, wherein said core layer is positioned between said first and second heat-resistant layers, and further wherein said sealable outer layer is positioned such that said first heat-resistant layer is positioned between said sealable outer layer and said core layer, said sealable outer layer haying a thickness of about 0.255 mils to about 0.300 mils.