PLASTIC PACKAGE CONTAINERS HAVING IMPROVED GAS BARRIER PROPERTIES

摘要

The invention provides a plastic packaging container designed to store items that are carbonated and/or oxygen-sensitive and includes: (a) a plastic body having an opening through which an oxygen-sensitive and/or carbonated item can pass, (b) a closure which seals the container's opening, and (c) a label which covers at least 30 % of the plastic package body's exterior surface, wherein the closure and/or the label have enhanced gas barrier properties. The gas barrier label includes: (a) a layer of a thermoplastic, gas-permeable label material, and (b) a layer of a thermosetting gas barrier material. When a gas barrier label is used, its gas barrier layer is in intimate contact with the container's exterior surface. The gas barrier closure includes: (a) a thermoplastic, gas-permeable closure body, and (b) a layer of a thermosetting gas barrier material. The thermosetting gas barrier material used in making the label's and/or closure's gas barrier layer includes the reaction product of a polyamine (A) and polyepoxide (B), wherein polyamine (A) includes at least: (a) an initial polyamine; (b) an ungelled amine-epoxide adduct having active amine hydrogens which is the reaction product of the initial polyamine and at least: (i) epichlorohydrin, and (ii) a polyepoxide having a plurality of glycidyl groups linked to an aromatic member; or (c) initial polyamine reacted with formaldehyde and a phenol R5-OH where R5 is an aromatic group or fused aromatic group which may contain alkyl substitutions of 1-4 carbon atoms.