Flexible polymer film with vapor impermeable coating
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United States of America Patent
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-
Oct 27, 1987
Issued Date -
N/A
app pub date -
Apr 12, 1982
filing date -
Apr 3, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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