Patent ID: 7241481

Claim:
A coextruded, heat shrinkable oxygen scavenger film comprising: a) a layer comprising a blend of: i) a sulfur scavenger comprising one or more materials selected from the group consisting of (a) copper metal, copper foil, or copper powder, where the copper is in the zero valence state; (b) silica, hydrotalcite, or alumina treated with copper in the ionic or zero valence state; (c) zinc acetate, zinc oxide, zinc stearate, or zinc ionomer; (d) iron oxide; (e) copper (II) oxide; (f) magnesium oxide; (g) calcium oxide; (h) alumina; and (i) ceria; and (ii) a polymer comprising one or more materials selected from the group consisting of: (a) ethylene/alpha olefin copolymer; (b) polypropylene; (c) low density polyethylene; (d) ethylene/vinyl acetate copolymer; (e) ethylene/acrylic acid copolymer; (f) ethylene/methacrylic acid copolymer; and (g) ionomer; b) a layer comprising an oxygen scavenger comprising one or more materials selected from the group consisting of i) ethylenically unsaturated hydrocarbon, ii) a polymer having a polymeric backbone, cyclic olefinic pendent group, and linking group linking the olefinic pendent group to the polymeric backbone, iii) a copolymer of ethylene and a strained, cyclic alkylene, and iv) ethylene/vinyl aralkyl copolymer; and c) a layer comprising an ethylene polymer or copolymer; wherein the film has a free shrink of at least 8% in either or both of the longitudinal and transverse directions.