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US 5,225,288 AGranted
Solvent blockers and multilayer barrier coatings for thin films
AssigneeE. I. Du Pont de Nemours and Company
InventorsCharles L. Beeson, Raymond T. Cole, Gedeon I. Deak, Herbeson H. Leidolf, Jr.
Life of this patent
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Abstract
A film comprising alternating layers of polyvinylidene chloride resin and a solvent barrier such as polyvinyl alcohol provides superior barrier properties. Barrier and mechanical properties are enhanced when formulation additives are present at customary levels only in the outermost layers.
Claims9
A coated film having good barrier and handling properties, comprising:
- (a) a substrate film;
- (b) at least one underlayer of vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives;
- and
- (c) at least one overlayer of vinylidene chloride polymer containing at least about 3 weight percent organic formulation additives.
1 more element
A coated film having good barrier, handling, and adhesive properties, comprising:
- (a) a substrate film;
- (b) at least one underlayer of a vinylidene chloride polymer containing less than about 3 weight percent organic formulation additives;
- and
- (c) at least one overlayer of a heat sealable thermoplastic polymer which adheres to said underlayer of vinylidene chloride polymer.
1 more element
Dependencies are inferred from the claim text.