초록 ▼

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 pack

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.

대표청구항 ▼

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 pe

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; said composite thin film coating comprising a thin film adhesion layer formed directly on said substrate of first material selected from the group consisting of chromium, tantalum, nickel, molybdenum, oxides of chromium, alloys of chromium with tantalum and nickel, a co-deposited mixture of chromium and silicon monoxide having at least about twenty percent chromium by weight, and a lead-aluminum silica glass composition to confer on said article said property of being capable of withstanding said retorting conditions; and a thin film barrier layer formed on said adhesion layer of a second material selected from the group consisting of silicon monoxide, silicon dioxide and mixtures of silicon dioxide with a glass modifier selected from the group consisting of oxides of magnesium, barium, and calcium, and fluorides of alkalai earth elements to confer on said article said property of substantially lower gas and vapor permeability.