Cross-linked PVOH coatings having enhanced barrier characteristics
AssigneeMobil Oil Corporation
InventorsWilliam M. Mallory, Eber C. Bianchini
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Abstract
An improved oxygen barrier layer for coating a substrate, such as a polymeric film. The oxygen barrier is a layer of cross-linked polyvinyl alcohol and glyoxal, which exhibits improved barrier characteristics to the transmission of oxygen. The oxygen barrier is produced by coating a solution of polyvinyl alcohol, glyoxal and tensoactive agent onto at least one side of a substrate adapted for receipt of such solution. The polyvinyl alcohol is thereafter cross-linked in the absence of a catalyst to provide the oxygen barrier.
Claims16
A method of providing an improved moisture-resistant oxygen barrier onto a surface of a substrate comprising:
- coating said surface of said substrate with a solution of poly(vinyl alcohol), glyoxal and a C.sub.4 to C.sub.10 alcohol, wherein said solution includes an amount of glyoxal sufficient to substantially 100% crosslink said poly(vinyl alcohol) and from about 5 ppm to about 0.5% by weight of said alcohol;
- and
- drying said coated substrate to substantially 100% crosslink said poly(vinyl alcohol) in the absence of a catalyst to provide said moisture-resistant oxygen barrier.
A polymeric film structure, comprising:
- an improved oxygen barrier bonded to an underlying substrate produced by the process of preparing a solution of poly(vinyl alcohol) and glyoxal, wherein said solution includes an amount of glyoxal sufficient to substantially 100% crosslink said poly(vinyl alcohol);
- adding from about 5 ppm to about 0.5% of a C.sub.4 to C.sub.10 alcohol to said solution to reduce the surface tension of said solution whereby improved bonding between said barrier and said substrate is achieved;
- and
- coating said solution on at least one side of said substrate and thereafter drying said coated substrate to substantially 100% crosslink said poly(vinyl alcohol) in the absence of a catalyst to provide an effective oxygen barrier thereon.
Dependencies are inferred from the claim text.