FILMS AND LAMINATES WITH HIGH OXYGEN BARRIER AND METHODS OF MAKING THE SAME
First Claim
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1. A laminated film for use to form a flexible package for holding an oxygen sensitive product, said film comprising:
- a layer of a metalizable polymer film or cellophane film having a first surface;
a layer of aluminum vacuum deposited on said first surface, said layer of aluminum having a second surface; and
an acidic layer of polyvinyl alcohol (PVOH) and a polymer coated on said second surface to cause a portion of said aluminum layer contiguous with said second surface to be converted into an inorganic aluminum compound, whereupon said laminated film has a higher oxygen barrier value than the sum of the oxygen barrier values of its individual components.
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Abstract
Disclosed is a laminated film for use to form a flexible package for holding an oxygen sensitive product and methods of making the film. The film includes a metalizable polymer film or cellulose film with aluminum vacuum deposited thereon. An acidic layer of polyvinyl alcohol and a polymer is coated on aluminum to cause a portion of the aluminum to be converted into an inorganic aluminum compound, whereupon said laminated film has a higher oxygen barrier value than the sum of the oxygen barrier values of its individual components Also disclosed are methods for making the laminated film.
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Citations
23 Claims
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1. A laminated film for use to form a flexible package for holding an oxygen sensitive product, said film comprising:
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a layer of a metalizable polymer film or cellophane film having a first surface; a layer of aluminum vacuum deposited on said first surface, said layer of aluminum having a second surface; and an acidic layer of polyvinyl alcohol (PVOH) and a polymer coated on said second surface to cause a portion of said aluminum layer contiguous with said second surface to be converted into an inorganic aluminum compound, whereupon said laminated film has a higher oxygen barrier value than the sum of the oxygen barrier values of its individual components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of making a laminated film having plural components, said laminated film being configured for use to form a flexible package for holding an oxygen sensitive product, said method comprising:
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providing a first film comprising a polymer film or a cellophane film having an aluminum metalized layer thereon, said aluminum metalized layer having an exposed surface; applying an acidic coating of polyvinyl alcohol (PVOH) and a polymer on said exposed surface to cause a portion of said aluminum layer contiguous with said exposed surface to be converted into an inorganic aluminum compound, whereupon said laminated film has a higher oxygen barrier value than the sum of the oxygen barrier values of its individual components. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification