Patent ID: 8709558

Claim:
A coextruded sterilizable film for aseptic packaging, said film comprising: a. a core layer having first and second major surfaces, said core layer comprising a polyamide; b. a first intermediate layer adjacent to the first major surface of the core layer, said first intermediate layer comprising ethylene vinyl alcohol copolymer; c. a second intermediate layer adjacent to the second major surface of the core layer, said second intermediate layer comprising a polyamide; d. a first outer layer comprising an olefinic copolymer; e. a second outer layer comprising a blend of a cyclic olefin copolymer and an olefinic copolymer, wherein said cyclic olefin copolymer has a glass transition temperature of at least 80° C., and wherein said olefinic copolymer has a melting point of at least 125° C.; f. a first tie layer adhering the first intermediate layer to the first outer layer; and g. a second tie layer adhering the second intermediate layer to the second outer layer; wherein said film has a storage modulus of at least 10 9 dynes/cm 2 at temperatures up to 140° C.