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AssigneeOptical Coating Laboratory, Inc.
InventorsRoger W. Phillips, Craig M. Shevlin, John S. Matteucci
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Flexible polymer packaging films having thin films of inorganic coatings deposited thereon to reduce the vapor permeability of the article. Inorganic thin film coatings comprising a composite of two materials are disclosed to confer both substantial transparency and retortability on the overall packaging film structure. The two material film composite involves either sequentially deposited films with the first thin film layer serving as an adhesion layer and the second thin film layer serving as a barrier layer. Alternatively, the two materials may be co-deposited to form a single thin film layer which provides sufficient adhesion to confer retortability on the overall film structure and also functions as relatively impermeable gas and vapor barrier for reducing the vapor transmission rate through the product. Various coated single film articles and dual film laminated articles are disclosed.
An article comprising a flexible polymer substrate and a thin film coating carried on at least one surface of said substrate and characterized by substantial transparency in the visible portion of the electromagnetic readiation spectrum, the barrier properties of substantially lower gas and vapor permeability, and the capability of withstanding retorting conditions of a superheated water or steam sterilization operation by maintaining adhesion of said coating to said substrate and retaining said barrier properties, said thin film coating comprising a composite of at least two separate inorganic materials preselected from a group of materials which have been predetermined to produce all of said properties concurrently;
An article comprising a flexible polymer substrate and a thin film coating carried on at least one surface of said substrate and being bonded to a second flexible sheet on said thin film coating side using an adhesive, said article being characterized by the properties of substantial transparency in the visible portion of the electromagnetic radiation spectrum, substantially lower gas and vapor permeability compared to uncoated polymer substrate, and the capability of withstanding retorting conditions of a superheated water or steam sterilization operation, said thin film coating comprising a composite of at least two separate materials formed on said substrate, said materials being preselected from a group of materials which have been predetermined to produce said properties.
An article comprising a flexible polymer substrate and a thin film coating carried on at least one surface of said substrate and characterized by substantial transparency in the visible portion of the electromagnetic radiation spectrum, the barrier properties of substantially lower gas and vapor permeability;
An article comprising a flexible polymer substrate, and a thin film coating carried on at least one surface of said substrate and comprising a thin film layer of chromium formed on said substrate surface, and a thin film layer of preselected glass material formed on said layer of chromium.
Dependencies are inferred from the claim text.