Film-forming composition, gas barrier laminate, and recycling method

Abstract

The present invention provides a film-forming composition that can be used as a primer, can impart gas barrier functionality equivalent to conventional materials, and can produce a laminate that can be recycled using a general recycling method, a gas barrier laminate using the same, and a recycling method. [Solution] A detachable film-forming composition for forming a film that detaches by treatment with an alkaline solution directly on the surface of a substrate A or via another layer, comprising a water-soluble polymer compound and a metal alkoxide and / or its hydrolysate, and having gas barrier properties; a gas barrier laminate using the same; and a recycling method.

Claims

1. A detachable film-forming composition for forming a film that detaches upon treatment with an alkaline solution, either directly on the surface of a substrate A or via another layer, It contains a water-soluble polymer compound and a metal alkoxide and / or its hydrolysate, A film-forming composition characterized by having gas barrier properties.

2. The film-forming composition according to claim 1, wherein the water-soluble polymer compound is a vinyl alcohol-based polymer.

3. The film-forming composition according to claim 1, wherein the metal alkoxide and / or hydrolysate thereof is a compound having one or more metal species selected from silicon and aluminum.

4. A film-forming composition according to claim 1, used as a primer.

5. A gas barrier laminate having a coating made of the coating-forming composition described in any one of claims 1 to 4, either directly on the surface of a substrate A or via another layer.

6. The gas barrier laminate according to claim 5, wherein the coating is a primer layer.

7. A gas barrier laminate having, at least in this order, a gas barrier primer layer and a printing ink layer printed directly on the surface of the primer layer, either directly on the surface of a substrate A or via another layer, The aforementioned primer layer having gas barrier properties is a film of the film-forming composition described in any one of claims 1 to 4. A gas barrier laminate wherein the printing ink layer contains the binder resin described in any of (1) to (5). (1) Cellulose resins and polyurethane resins (2) Cellulose resins and polyamide resins (3) Polyvinyl butyral resin and polyurethane resin (4) Vinyl chloride vinyl acetate resin and polyurethane resin (5) Acrylic resin emulsion

8. A method for recycling a gas barrier laminate, comprising the steps of: immersing a gas barrier laminate having at least in this order a gas barrier primer layer and a printing ink layer printed directly on the surface of the primer layer, either directly on the surface of a substrate A or via another layer, in an alkaline solution to separate the laminate into its individual layers; and recovering each of the separated layers, The aforementioned primer layer having gas barrier properties is a film of the film-forming composition described in any one of claims 1 to 4. A method for recycling a laminate in which the printing ink layer contains a binder resin according to any one of (1) to (5). (1) Cellulose resins and polyurethane resins (2) Cellulose resins and polyamide resins (3) Polyvinyl butyral resin and polyurethane resin (4) Vinyl chloride vinyl acetate copolymer resin and polyurethane resin (5) Acrylic resin emulsion

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