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US 8,709,558 B2Granted
Sterilizable film for aseptic packaging
AssigneeCryovac, Inc.
InventorSolomon Bekele
Life of this patent
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Abstract
The presently disclosed subject matter is directed to a multilayer coextruded sterilizable film that can be used for aseptic packaging applications. The film comprises an outer layer comprising a blend of a cyclic olefin copolymer with a glass transition temperature of at least 80° C. and an olefinic copolymer with a melting point of at least 125° C. The film has a storage modulus of at least 109 dynes/cm2 at temperatures of up to 140° C. An aseptic package and a method of making an aseptic package are also disclosed.
Claims7
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 109 dynes/cm2 at temperatures up to 140° C.
6 more elements
A printed sterilizable laminate for aseptic packaging, said laminate comprising:
- a. a first coextruded multilayer film comprising:
- i. a core layer having first and second major surfaces, said core layer comprising a polyamide;
- ii. a first intermediate layer adjacent to the first major surface of the core layer, said first intermediate layer comprising ethylene vinyl alcohol copolymer;
- iii. a second intermediate layer adjacent to the second major surface of the core layer, said second intermediate layer comprising a polyamide;
- iv. a first outer layer comprising an olefinic copolymer;
- v. 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.;
- vi. a first tie layer adhering the first intermediate layer to the first outer layer;
- and
- vii. a second tie layer adhering the second intermediate layer to the second outer layer;
- b. a second coextruded multilayer film comprising:
- i. a core layer having first and second major surfaces, said core layer comprising a polyamide;
- ii. a first intermediate layer adjacent to the first major surface of the core layer, said first intermediate layer comprising ethylene vinyl alcohol copolymer;
- iii. a second intermediate layer adjacent to the second major surface of the core layer, said second intermediate layer comprising a polyamide;
- iv. a first outer layer comprising an olefinic copolymer;
- v. 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.;
- vi. a first tie layer adhering the first intermediate layer to the first outer layer;
- and
- vii. a second tie layer adhering the second intermediate layer to the second outer layer;
- c. a printed image disposed on the outside surface of the first coextruded multilayer film, or the inside surface of the second coextruded multilayer film;
- and
- d. an adhesive that bonds the first outer layer of the first coextruded multilayer film to the second outer layer of the second coextruded multilayer film;
- wherein said laminate has a storage modulus of at least 109 dynes/cm2 at temperatures up to 140° C.
19 more elements
Dependencies are inferred from the claim text.