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US 7,794,804 B2Granted
Oxygen scavenging packaging
AssigneeCryovac, Inc.
InventorsGary D. Jerdee, James P. Leonard, Ta Yen Ching, Joseph L. Goodrich, Brad D. Rodgers, Richard P. Schmidt
Life of this patent
Estimating the term…
Abstract
Oxygen scavenging materials incorporated into or attached to a package such as a gable-top or rectangular carton, used to package foods, beverages or other oxygen sensitive materials, and thereby increase shelf-life by decreasing oxygen in the headspace of the package, and decreasing oxidation of the packaged product.
Claims7
A rigid paperboard container, the container being constructed from extrusion coated or laminated paperboard comprising:
- (a) a paperboard substrate having opposed inner and outer surfaces;
- (b) a first polymer layer coated or laminated onto the outer surface of said paperboard substrate, the first polymer layer comprising one or more materials selected from the group consisting of
- i) low density polyethylene polymer,
- ii) linear low density polyethylene polymer,
- iii) a blend of low density polyethylene polymer and linear low density polyethylene polymer, and
- iv) a coextrusion of low density polyethylene polymer and linear low density polyethylene polymer;
- and
- (c) an inner product contact sandwich layer comprising
- i) a second polymer layer coated or laminated onto the inner surface of said paperboard substrate,
- ii) a first tie layer, the first tie layer comprising one or more materials selected from the group consisting of
- (a) anhydride grafted polymer, copolymer or terpolymer,
- (b) maleic anhydride modified polymer, and
- (c) ionomer;
- iii) an oxygen barrier layer comprising one or more materials selected from the group consisting of
- (a) ethylene vinyl alcohol copolymer, and
- (b) polyamide;
- iv) a second tie layer, the second tie layer comprising one or more materials selected from the group consisting of
- (a) anhydride grafted polymer, copolymer or terpolymer,
- (b) maleic anhydride modified polymer, and
- (c) ionomer;
- v) an oxygen scavenging layer comprising an oxygen scavenging material;
- wherein the oxygen scavenging material is selected from the group consisting of
- (a) poly[ethylene-methyl acrylate-cyclohexene acrylate] terpolymer and a transition metal catalyst,
- (b) a combination of a polymeric backbone, cyclic olefinic pendent groups and linking groups linking the olefinic pendent groups to the polymeric backbone, and a transition metal catalyst;
- and
- (c) styrene/butadiene/styrene copolymer, and a transition metal catalyst, and
- vi) a seal layer coating or laminating the innermost surface of the inner product contact sandwich layer;
- wherein the container is a gable top carton or a rectangular carton.
25 more elements
Dependencies are inferred from the claim text.