Packaging

Abstract

The present invention provides a wall for a package, which wall comprises, or includes a layer comprising, a composition comprising a polymer and capable of scavenging oxygen through the metal-catalysed oxidation of an oxidisable organic component thereof. The oxidisable organic component is preferably itself a polymer, and may be the only polymer in the composition. Preferred compositions include a blend of 96% polyethylene terephthalate and 4% poly (m-xylyleneadipamide) containing 200 ppm cobalt as catalyst, with good permeance-versus-time performance (3) when formed into a bottle.

1 - 38 . (Canceled).  
     
     
         39 . A multilayer wall for a package comprising: 
 an oxygen-scavenging layer comprising an oxidizable polymer and a transition metal in a positive oxidation state that promotes the oxidation of the oxidizable polymer; and    at least one additional layer comprising a non-oxidizable polymer wherein the permeability for oxygen of the non-oxidizable polymer is not more than 6.0 cm 3  mm/(m 2  atm day),    wherein the oxygen-scavenging layer is between the at least one additional layer and the inside of the package.    
     
     
         40 . The multilayer wall of  claim 39  wherein the non-oxidizable polymer in the at least one additional layer is PET.  
     
     
         41 . The multilayer wall of  claim 39  wherein the transition metal in the positive oxidation state is cobalt.  
     
     
         42 . The multilayer wall of  claim 39  wherein the oxidizable polymer is a polyamide.  
     
     
         43 . The multilayer wall of  claim 42  wherein the polyamide is MXD6.  
     
     
         44 . The multilayer wall of  claim 43  wherein the transition metal in the positive oxidation state is cobalt.  
     
     
         45 . The multilayer wall of  claim 43  wherein the non-oxidizable polymer in the at least one additional layer is PET.  
     
     
         46 . The multilayer wall of  claim 39  wherein the wall has a permeance for oxygen that is not more than three-quarters of that which it would have in the absence of oxygen scavenging properties.  
     
     
         47 . The multilayer wall of  claim 39  wherein the wall has a permeance for oxygen that is not more than 10.0 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.  
     
     
         48 . The multilayer wall of  claim 47  wherein the wall has a permeance for oxygen that is not more than 2.0 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.  
     
     
         49 . The multilayer wall of  claim 48  wherein the wall has a permeance for oxygen that is not more than 0.5 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.  
     
     
         50 . A multilayer wall for a package comprising: 
 at least one oxygen-scavenging layer comprising an oxidizable polymer and a transition metal in a positive oxidation state that promotes the oxidation of the oxidizable polymer; and    at least one other layer comprising a polymer, wherein the permeability for oxygen of the polymer is not more than 6.0 cm 3  mm/(m 2  atm day).    
     
     
         51 . The multilayer wall of  claim 50  wherein the transition metal in the positive oxidation state is cobalt.  
     
     
         52 . The multilayer wall of  claim 50  wherein the polymer of the at least one other layer is MXD6.  
     
     
         53 . The multilayer wall of  claim 50  wherein the transition metal in the positive oxidation state is cobalt.  
     
     
         54 . The multilayer wall of  claim 50  wherein the polymer in the at least one other layer has a permeability for oxygen of not more than 0.1 cm 3  mm/(m 2  atm day).  
     
     
         55 . The multilayer wall of  claim 50  wherein the transition metal in the positive oxidation state is cobalt.  
     
     
         56 . The multilayer wall of  claim 55  wherein the at least one oxygen-scavenging layer further comprises PET.  
     
     
         57 . The multilayer wall of  claim 50  wherein the wall has a permeance for oxygen that is not more than three-quarters of that which it would have in the absence of oxygen scavenging properties.  
     
     
         58 . The multilayer wall of  claim 50  wherein the wall has a permeance for oxygen that is not more than 10.0 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.  
     
     
         59 . The multilayer wall of  claim 58  wherein the wall has a permeance for oxygen that is not more than 2.0 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.  
     
     
         60 . The multilayer wall of  claim 59  wherein the wall has a permeance for oxygen that is not more than 0.5 cm 3 /(m 2  atm day) at least in part due to the transition metal promoting the oxidation of the oxidizable polymer.