Barrier properties for polymeric containers
AssigneePPG Industries, Inc.
InventorJerome A. Seiner
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Abstract
The shelf life of polymeric containers may be economically extended by coating with a barrier material having less than half the permeability of the substrate polymer, the coating being applied to 30 to 75 percent of the container's area, with the proviso that the uncoated area has an average permeability of no more than 15 cc-mm per square meter per day per atmosphere.
Claims11
A polymeric container coated on 30 to 75 percent of its exterior surface with a barrier material whose gas permeability is less than half that of the polymer of which the container is made, the remaining area of the polymeric container without the barrier material having an average carbon dioxide permeability of less than ##EQU1## the base portion of the container being substantially excluded from the area that is coated with the barrier material.
Dependencies are inferred from the claim text.