GAS-BARRIER MULTILAYER FILM

• US 20120128956A1
• Filed: 06/27/2010
• Published: 05/24/2012
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Takatsu, Youji, Tsumagari, Yumi, Ookawa, Takeshi, Morihara, Yoshiharu, Matsuda, Syuusei
• Granted Patent: US 9,605,122 B2
• Time in Patent Office: Days
• US Class Current: 428/216
• CPC Class Codes: C08J 7/0423 with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• 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 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

Provided is a gas-barrier multilayer film which decreases little in gas-barrier properties even through retortion and which suffers no delamination. The gas-barrier multilayer film is characterized by comprising a plastic film and, superposed directly or through other layer on at least one surface thereof in the following order, an inorganic thin film layer and a gas-barrier resin composition layer. The gas-barrier film is further characterized in that the gas-barrier resin composition layer has been formed from a gas-barrier resin composition comprising a gas-barrier resin constituted of an ethylene/vinyl alcohol copolymer, an inorganic lamellar compound, and an additive, that the content of the inorganic lamellar compound in the gas-barrier resin composition is 0.1-9.0 mass %, that the additive is a coupling agent and/or a crosslinking agent, and that the gas-barrier resin composition layer has a thickness of 0.05-0.5 μm.

Claims

1. A gas-barrier multilayer film, comprising a plastic film and, an inorganic thin film layer and a gas-barrier resin composition layer being stacked in this order with or without intervention of other layers on at least one surface of the plastic film, wherein

the gas-barrier resin composition layer is formed from a gas-barrier resin composition comprised of a gas-barrier resin including an ethylene-vinyl alcohol-based copolymer, an inorganic layered compound, and an additive,

the content of the inorganic layered compound in the gas-barrier resin composition is from 0.1% by mass to 9.0% by mass, and the additive is a coupling agent and/or a cross-linking agent, and

the thickness of the gas-barrier resin composition layer is from 0.05 μ

m to 0.5 μ

m.

2. The gas-barrier multilayer film according to claim 1, wherein the inorganic layered compound is smectite.

3. The gas-barrier multilayer film according to claim 1, wherein the coupling agent is a silane coupling agent having at least one kind of organic functional group.

4. The gas-barrier multilayer film according to claim 1, which comprises a cross-linking agent for a group capable of forming a hydrogen bond as the cross-linking agent.

5. The gas-barrier multilayer film according to claim 1, wherein a total content of the additive in the gas-barrier resin composition is from 0.3% by mass to 20% by mass.

6. The gas-barrier multilayer film according to claim 1, wherein the inorganic thin film layer comprises at least an inorganic oxide.

7. The gas-barrier multilayer film according to claim 1, which has an anchor coating layer having a thickness of from 0.05 μ

m to 0.5 μ

m between the inorganic thin film layer and the gas-barrier resin composition layer.

8. The gas-barrier multilayer film according to claim 7, wherein an anchor coating agent resin composition for forming the anchor coating layer comprises a silane coupling agent having at least one kind of organic functional group.

9. The gas-barrier multilayer film according to claim 8, wherein an amount of the silane coupling agent added in the anchor coating agent resin composition for forming the anchor coating layer is from 0.1% by mass to 10% by mass.

10. The gas-barrier multilayer film according to claim 1, wherein (a) the inorganic layered compound is smectite, (b) the coupling agent is a silane coupling agent having at least one kind of organic functional group, (c) the cross-linking agent is a cross-linking agent for a group capable of forming a hydrogen bond, (d) the additive is present in the gas-barrier resin composition in an amount of from 0.3% by mass to 20% by mass, and (e) the inorganic thin film layer comprises at least an inorganic oxide.

11. The gas-barrier multilayer film according to claim 10, which has an anchor coating layer having a thickness of from 0.05 μ

m to 0.5 μ

m between the inorganic thin film layer and the gas-barrier resin composition layer.

12. The gas-barrier multilayer film according to claim 11, wherein an anchor coating agent resin composition for forming the anchor coating layer comprises a silane coupling agent having at least one kind of organic functional group.

13. The gas-barrier multilayer film according to claim 12, wherein an amount of the silane coupling agent added in the anchor coating agent resin composition for forming the anchor coating layer is from 0.1% by mass to 10% by mass.