Low permeability materials and coatings

• US 20040033379A1
• Filed: 06/10/2003
• Published: 02/19/2004
• Est. Priority Date: 06/12/2002
• Status: Abandoned Application

• Current Assignee: Avery Dennison Corporation
• Original Assignee: Avery Dennison Corporation
• Inventors: Grunlan, Jamie C., Heydarpour, Ramin, Li, Kai, Chiao, Yi-Hung, Licon, Mark
• Application Number:
  US10/459,025
• Publication Number:
  US 20040033379A1
• Time in Patent Office: Days
• US Class Current: 428/515
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: C08J 2367/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 7/043 Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/048 Forming gas barrier coatings
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31909 Next to second addition polymer from unsaturated monomers

Abstract

One aspect of the invention relates to a new dual-layered construction that provides advantageous oxygen barrier properties. Another aspect of the invention is a multilayer film that has advantageous oxygen and/or moisture barrier properties. The film may be fully-organic. The film may also be primarily water-based. At least some embodiments of the film can be produced using wide-web, roll-to-roll processing. Specific example applications for uses of the film include dried food, pharmaceuticals, liquids, lidstock, cheese, meat, health & beauty, and coffee packaging, among many others. Another aspect of the invention is a water-based, fast curing coating composition that provides a high barrier against oxygen and moisture permeation. In one embodiment, the coating comprises special PVDC copolymer compositions with good oxygen barrier (OTR<1 cc/m² day) and high moisture barrier (MVTR<0.5 g/m² day). As one example, the coating may be used to produce a flexible, high clarity, barrier film for packaging.

Claims

1. A barrier film comprising:

a substrate film; and

means for improving at least one of the moisture barrier properties and oxygen barrier properties of the substrate film.

2. A barrier film as defined in claim 1, wherein the barrier film comprises a film coated with at least one of an aqueous solution and an organic solution.

3. A barrier film as defined in claim 2 further comprising a PVDC coating.

4. A barrier film as defined in claim 1, wherein the means for improving the oxygen barrier properties of the substrate film comprises at least one of the group constituting PVOH-based co-polymers, PVOH-based terpolymers, ethylene vinyl alcohol based copolymers, and materials that contain hydrophilic functional groups.

5. A barrier film as defined in claim 1, comprising a PVOH-based terpolymer, said terpolymer being covered by a tie layer to promote wefting, said terpolymer being sandwiched between layers of latex-based PVdC.

6. A barrier film as defined in claim 1, comprising a PVAc latex-based layer, said PVAc layer being sandwiched between layers of latex-based PVdC.

7. A barrier film as defined in claim 1, comprising a terpolymer;

said terpolymer being blended with an aqueous latex.

8. A barrier film as defined in claim 1, wherein the film comprises a substrate film, a first water barrier layer, an oxygen barrier layer, and a second water barrier layer.

9. A barrier film as defined in claim 8, wherein the first water barrier is between 5 and 30 micrometers in thickness, the oxygen barrier is between 1 and 20 micrometers in thickness, and the second water barrier is between 5 and 30 micrometers in thickness.

10. A barrier film as defined in claim 8, wherein the first and second water barrier layers comprise PVdC and the oxygen barrier comprises PVAc.

11. A barrier film as defined in claim 8, wherein the first and second water barrier layers each comprise two sublayers.

12. A barrier film, as defined in claim 1, comprising at least one of a PVOH copolymer and a PVOH terpolymer, the PVOH-based polymer being blended with clay.