Oxygen and moisture barrier metallized film structure
AssigneeMobil Oil Corporation
InventorsEber C. Bianchini, Anthony R. Knoerzer, Larry A. Parr, Leland W. Reid
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Abstract
A polymeric film structure having improved oxygen and moisture barrier characteristics is disclosed. The structure includes a polymeric substrate adapted to receive an oxygen barrier on one side thereof and a moisture barrier on the other side of the oxygen barrier. The oxygen barrier includes polyvinyl alcohol cross-linked with aldehyde containing cross-linking agents in the presence of a catalytic amount of an inorganic acid, preferably sulfuric acid. The moisture barrier is a metallized polymeric composite, preferably metallized oriented polypropylene.
Claims17
A polymeric film structure which comprises:
- (I) a polymeric substrate having at least one treated surface for the receipt of an oxygen barrier coating;
- (II) an oxygen barrier coating on said one treated surface of said polymeric substrate, said oxygen barrier coating comprising polyvinyl alcohol cross-linked with an cross-linking agent in the presence of sulfuric acid present in an amount sufficient to catalyze cross-linking of said polyvinyl alcohol, said coating having an outer surface opposite said polymeric substrate;
- and
- (III) a moisture barrier on said outer surface of said oxygen barrier coating, said moisture barrier comprising an oriented polyolefin layer having at least one treated surface and a metal coating thereon whereby said polymeric film structure has enhanced oxygen and moisture barrier properties.
A polymeric film structure having improved oxygen and moisture barrier properties, produced by the following steps:
- (i) coating one surface of a polymeric substrate adapted to receive an oxygen barrier coating with an aqueous solution of polyvinyl alcohol, an aldehyde-containing cross-linking agent and sulfuric acid present in an amount sufficient to catalyze cross-linking of polyvinyl alcohol;
- (ii) cross-linking polyvinyl alcohol to provide said oxygen barrier coating having an outer surface opposite said polymeric substrate;
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- (iii) providing a moisture barrier to said outer surface of said oxygen barrier coating by adhering or extrusion laminating of metallized oriented polypropylene onto said outer surface of said oxygen barrier coating, whereby said film structure having improved oxygen and moisture barrier is obtained.
Dependencies are inferred from the claim text.