초록 ▼

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 prefera

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.

대표청구항 ▼

A method for packaging an oxygen-sensitive material, comprising (i) preparing a package having a wall which comprises: (a) a base polymer which includes an oxidizable organic polymer component which scavenges oxygen, and (b) a transition metal in a positive oxidation state, wherein the oxidizable or

A method for packaging an oxygen-sensitive material, comprising (i) preparing a package having a wall which comprises: (a) a base polymer which includes an oxidizable organic polymer component which scavenges oxygen, and (b) a transition metal in a positive oxidation state, wherein the oxidizable organic polymer component, the transition metal and the respective amounts thereof are selected so that the wall will scavenge oxygen during a period of oxygen scavenging to such an extent that the permeance of the wall for oxygen is not more than 0.5 cm3/(m2 atm day), the period of oxygen scavenging is maintainable for at least 20 days at 23°C. and 50% relative humidity and the permeance of the wall for oxygen during said period of oxygen scavenging is not more than three-quarters of that which it would have had in the absence of oxygen scavenging, (ii) enclosing an oxygen-sensitive material in said package and (iii) then allowing said wall to scavenge oxygen during at least a portion of said period of oxygen scavenging.