High barrier film

• US 5,591,520 A
• Filed: 04/28/1995
• Issued: 01/07/1997
• Est. Priority Date: 12/11/1991
• Status: Expired due to Fees

• Current Assignee: Mobil Oil Corporation (Exxon Mobil Corporation)
• Original Assignee: Mobil Oil Corporation (Exxon Mobil Corporation)
• Inventors: Migliorini, Robert A., Mount, Eldridge M. III
• Primary Examiner(s): NAKARANI, DHIRAJLAL S
• Application Number:
  US08/430,701
• Time in Patent Office: 620 Days
• Field of Search: 428/346, 428/347, 428/349, 428/458, 428/461, 428/463, 428/476.1, 428/476.3, 428/476.9, 428/516, 428/520, 428/124, 428/35.3, 428/35.8, 428/35.9, 428/910
• US Class Current: 428/347
• CPC Class Codes: B32B 2307/514 Oriented
• CPC Class Codes: B32B 2307/702 Amorphous
• CPC Class Codes: B32B 2307/704 Crystalline
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/2817 Heat sealable
• CPC Class Codes: Y10T 428/2826 Synthetic resin or polymer
• CPC Class Codes: Y10T 428/31681 Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31746 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/3175 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/31757 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer

Abstract

An oriented film combination of (a) a base layer of polypropylene at least one surface of which comprises a maleic acid anhydride modified polypropylene; and (b) on at least one surface, a skin layer of an amorphous polyamide or a blend of an amorphous polyamide and a semicrystalline polyamide.

Claims

1. A stretched multi-layer oxygen gas barrier film combination comprising in the following order:

(a) a base layer of polypropylene homopolymer or copolymer at least one surface thereof comprising a maleic acid anhydride modified polypropylene homopolymer or copolymer;

(b) a skin layer of an amorphous polyamide directly bonded on said at least one surface comprising a maleic acid anhydride modified polypropylene homopolymer or copolymer; and

(c) a vacuum metallized layer on said polyamide skin layer.

2. The film combination of claim 1 wherein said at least one surface of (a) comprises:

(1) said maleic anhydride modified polypropylene homopolymer or copolymer intermixed with said base layer polypropylene homopolymer or copolymer;

or

(2) a separately applied skin layer comprising said maleic anhydride modified polypropylene homopolymer or copolymer on said base layer.

3. The film combination of claim 1 wherein said base layer has a heat sealable layer on the surface opposite the surface carrying said polyamide skin layer.

4. The film combination of claim 3 wherein said heat sealable layer is a member selected from the group consisting of an ethylene-propylene random copolymer and an ethylene-propylene-butene-1 terpolymer.

5. The film combination of claim 1 wherein said metallized layer comprises aluminum.

6. The film combination of claim 3 wherein the metallized layer is laminated to another polyolefin film.