Cellulose material containing barrier film structures
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, flavor/odor, grease/oil 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 sulfuric acid. The moisture barrier can be provided by the carrier web or incorporated into the cellulosic material, which is preferably box board.
Claims20
A cellulose containing packaging film structure which comprises:
- I. a polymeric substrate having at least one treated surface, said treated surface having a primer layer thereon;
- II. an oxygen and enhanced moisture barrier water-soluble coating onto said primed treated surface of said polymeric substrate, said coating comprising polyvinyl alcohol cross-linked with an aldehyde containing cross-linking agent in the presence of a catalytic amount of sulfuric acid on said one primed surface of said polymeric substrate;
- III. a cellulose material laminated to an outer surface of said oxygen and enhanced moisture barrier coating whereby said cellulose containing polymeric film structure has enhanced oxygen, flavor/odor, grease/oil and moisture barrier properties.
A cellulose containing packaging film structure having improved oxygen, flavor/odor, grease/oil, and moisture barrier characteristics, produced by the following steps:
- (i) coating one surface of a surface treated and primed polymeric substrate adapted to receive an oxygen barrier coating with an aqueous solution of polyvinyl alcohol, an aldehyde-containing cross-linking agent and a catalytic amount of sulfuric acid;
- (ii) cross-linking said polyvinyl alcohol to provide said oxygen, flavor/odor, grease/oil and moisture barrier;
- and
- (iii) adhering or extrusion laminating a cellulose material moisture barrier to an outer surface of said oxygen and moisture barrier coating obtained in step (ii).
A cellulose containing packaging film structure which comprises:
- I. a polymeric substrate having at least one treated surface, said treated surface having a primer layer thereon;
- II. an oxygen and enhanced moisture barrier coating onto said primed treated surface of said polymeric substrate, said coating comprising polyvinyl alcohol cross-linked with an aldehyde containing cross-linking agent in the presence of a catalytic amount of sulfuric acid on said one primed surface of said polymeric substrate;
- III. a cellulose material laminated to an outer surface of said oxygen and enhanced moisture barrier coating whereby said cellulose containing polymeric film structure has enhanced oxygen, flavor/odor, grease/oil and moisture barrier properties;
- IV. an adhesive coating between said oxygen barrier and said cellulose material;
- and
- V. a heat seal layer on an outer surface of said polymeric substrate.
A cellulose containing packaging film structure which comprises:
- I. a polymeric substrate having at least one treated surface, said treated surface having a primer layer thereon;
- II. an oxygen and enhanced moisture barrier water-soluble coating onto said primed treated surface of said polymeric substrate, said coating comprising polyvinyl alcohol cross-linked with an aldehyde containing cross-linking agent in the presence of a catalytic amount of sulfuric acid on said one primed surface of said polymeric substrate;
- III. a cellulose material laminated to an outer surface of said oxygen and enhanced moisture barrier coating whereby said cellulose containing polymeric film structure has enhanced oxygen, flavor/odor, grease/oil and moisture barrier properties, wherein said primer is selected from the group consisting of a primer produced by condensing a monoaldehyde with an interpolymer of acrylamide or methacrylamide and at least one other unsaturated monomer;
- a primer produced by condensing aminoaldehyde with acrylamide or methacrylamide and interpolymerizing the condensation product with another unsaturated monomer in the presence of a C.sub.1 -C.sub.6 alkanol;
- poly(ethyleneimine);
- and the reaction product of an epoxy resin and an acidified aminoethylated vinyl polymer.
Dependencies are inferred from the claim text.