Multilayer film having an active oxygen barrier layer with radiation enhanced active barrier properties

摘要

The present invention is directed to a multilayer film having an active oxygen barrier layer that comprises an oxygen scavenging composition that is a blend of a thermoplastic resin (A) having carbon-carbon double bonds substantially in its main chain, a transition metal salt (B), and an oxygen barrier polymer (C) having oxygen barrier properties that can be further enhanced by exposing the composition to a source of ionizing radiation e.g., electron beam radiation. Irradiation improves the oxygen scavenging abilities of the oxygen scavenging composition so that oxygen can be intercepted and scavenged as it passes through the film. The resulting irradiated multilayer film has improved active barrier properties in comparison to the same film prior to irradiation. As result, the multilayer film of the present invention can be used in packaging applications to help maintain a low oxygen atmosphere in the interior of a package.

主权项

1. An active oxygen barrier film comprising an irradiated multilayer film having an active oxygen barrier layer comprising an oxygen scavenging composition that is a blend of:
(A) a thermoplastic resin having carbon-carbon double bonds substantially in its main chain; (B) a transition metal salt; and (C) an oxygen barrier polymer, wherein the oxygen scavenging composition has active oxygen barrier properties prior to irradiation, and the active oxygen barrier layer is disposed between an outer sealant layer and an outer abuse layer, wherein the multilayer film has been irradiated with an electron beam radiation dosage between about 2 and 200 kilo Gray, and wherein the film has an oxygen scavenging rate that is at least about 0.01 cc oxygen per day per gram of the oxygen scavenging composition blend; and the film exhibits a higher rate of oxygen scavenging in comparison to the same film prior to irradiation.