MULTI LAYER OXYGEN ABSORBING PLASTIC STRUCTURE

摘要

588146 A Multilayer oxygen absorbing structure 30 comprising at least two reactive oxygen scavenging layers arranged in sequence: a rapidly absorbing highly reactive oxygen-scavenging system layer 22, comprising an oxygen permeable matrix polymer and an oxygen scavenger, and a long life reactive layer 24 comprising high passive oxygen barrier matrix polymer, and an oxygen scavenger. The dimensionless reactivity of each reactive layer is defined in terms of the initial Thiele modulus Ø0 of the equivalent homogeneously reactive uniform layer and is greater than 3. The rapidly absorbing layer 22 has a passive oxygen permeability of greater than 250 cc mm/(m2 day atm) at about 20ºC and relative humidity of 40-60%. The long life layer 24 has a passive oxygen permeability of less than 2.5 cc mm/(m2 day atm) at about 20ºC and relative humidity of 40-60%