Patent ID: 8110261

Claim:
Multilayer oxygen absorbing structure comprising at least two reactive oxygen scavenging layers arranged in sequence: a rapidly absorbing highly reactive oxygen-scavenging layer, comprising an oxygen permeable matrix polymer and an oxygen scavenger, and a long life reactive layer comprising high passive oxygen barrier matrix polymer, and an oxygen scavenger, wherein dimensionless reactivity of each reactive layer, defined in terms of the initial Thiele modulus φ 0 of the equivalent homogeneously reactive uniform layer, is greater than 3, and wherein the rapidly absorbing layer has a passive oxygen permeability of greater than 250 cc mm/(m2 day atm) about 20° C. and relative humidity of 40-60%, and wherein the long life layer has a passive oxygen permeability of less than 2.5 cc mm/(m2 day atm) at about 20° C. and relative humidity of 40-60%.