Use of photosensitive molecules and metal complexes as oxygen scavenger elements

Abstract

An oxygen-scavenging composition for food packaging applications comprising (I) a polymeric resin, (II) one or more oligomeric photosensitizers, (Ill) a metal salt, (IV) a sacrificial oxidizable substrate and optionally (V) additional components is provided.

1 . An oxygen-scavenging composition for food packaging applications comprising (I) a polymeric resin, (II) one or more oligomeric photosensitizers, (III) a metal salt, (IV) a sacrificial oxidizable substrate and optionally (V) additional components. 
     
     
         2 . The oxygen-scavenging composition according to  claim 1  wherein the polymeric resin is a thermoplastic polymer selected from the group consisting of homo- or copolymers of olefin monomers, copolymers of olefin monomers with diolefin monomers, cyclic olefins, copolymers of one or more 1-olefins or diolefins with carbon monoxide, copolymers of one or more 1-olefins and diolefins with carbon monoxide and polyvinyl alcohol. 
     
     
         3 . The oxygen-scavenging composition according to  claim 1  wherein the metal salt is based on Co, Ce, Mn, Cu, Ni or Vd. 
     
     
         4 . The oxygen-scavenging composition according to  claim 1  wherein the sacrificial oxidizable substrate is selected from the group consisting of polybutadiene, polyester, squalane, squalene, polystyrene, poly-limonene, poly alpha pinene, poly beta pinene, polynorbornene, polylactic acid and a mixture of linear and branched alkyl chain C 6 -C 30  alcohols. 
     
     
         5 . The oxygen-scavenging composition according to  claim 1  which further comprises one or more components selected from the group consisting of fillers, reinforcing agents, pigments, light stabilizers, antioxidants, antislip or antiblock additives, plasticizers, optical brighteners, antistatic agents and blowing agents. 
     
     
         6 . The oxygen-scavenging composition according to  claim 1  with the proviso that components (I) and (IV) are different. 
     
     
         7 . The oxygen-scavenging composition according to  claim 1 , wherein component (IV) is a polyterpenic resin. 
     
     
         8 . An article containing a composition as defined in  claim 1 . 
     
     
         9 . An article according to  claim 8 , which is a film, a sheet or a laminate. 
     
     
         10 . An article according to  claim 9  which is a coextruded multilayer film. 
     
     
         11 . An article according to  claim 9  which is a food packaging.