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US 5,151,331 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, Harbeson 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.
Claims13
A coated film prepared by the following process:
- (a) applying a coating of solvent-borne polymeric composition to at least one surface of said film;
- (b) removing substantially all of the solvent from said at least one coating;
- (c) thereafter applying to the coated surface of said film a polymeric barrier layer;
- (d) applying to said polymeric barrier layer a subsequent coating of solvent-borne polymeric composition, carried in a solvent to which said polymeric barrier layer is substantially impermeable;
- and
- (e) removing the solvent from the subsequent coating;
- whereby the solvent carrying said subsequent coating does not permeate the underlying coating.
4 more elements
A coated film manufactured by the following process:
- (a) applying a coating of solvent-borne polymeric composition comprising at least one vinylidene chloride polymer to at least one surface of said film;
- (b) removing substantially all of the solvent from said at least one coating;
- (c) thereafter applying to the coated surface of said film, from a solvent comprising water, a water soluble polymeric barrier layer;
- (d) applying to said polymeric barrier layer a subsequent coating of solvent-borne polymeric composition comprising at least one vinylidene chloride polymer, carried in a solvent to which said polymeric barrier layer is substantially impermeable;
- and
- (e) removing the solvent from the subsequent coating;
- whereby the solvent carrying said subsequent coating does not permeate the underlying coating.
4 more elements
Dependencies are inferred from the claim text.