Laminate, package, and method for producing laminate

Abstract

The present invention addresses the problem of providing: a laminate which has high productivity and exhibits good gas barrier properties even in a thin-film configuration; and a method for producing a laminate. Disclosed is a laminate which has an inorganic oxide layer on at least one surface of a polyolefin-based resin film, wherein: the inorganic oxide layer contains aluminum and oxygen; and the surface density of the inorganic oxide layer is 50 × 1015 atoms / cm2 to 65 × 1015 atoms / cm2 inclusive. It is preferable that the element ratio O / Al of the oxygen to the aluminum contained in the inorganic oxide layer is 1.50 to 2.20 inclusive. With this method for producing a laminate, an inorganic oxide layer is formed on the surface of a polyolefin-based resin film by evaporating aluminum by a vacuum deposition method and introducing oxygen into the aluminum vapor.

Claims

1. A laminate having an inorganic oxide layer on at least one surface of a polyolefin resin film, wherein the inorganic oxide layer contains aluminum and oxygen, and the surface density of the inorganic oxide layer is 50 × 10 １５ atoms / cm ２ The above 65 x 10 １５ atoms / cm ２ The following is the laminated structure.

2. The laminate according to claim 1, wherein the elemental ratio O / Al of aluminum to oxygen contained in the inorganic oxide layer is 1.50 or more and 2.20 or less.

3. In the spectrum detected by measuring the inorganic oxide layer using the FT-IR-ATR method (attenuated total reflectance Fourier transform infrared spectroscopy), the wavenumber a [cm] －１ The laminate according to claim 2, wherein when the absorption intensity of ] is P(a), P(3300) / P(3230) is 1 or more.

4. The laminate according to any one of claims 1 to 3, wherein, when the thickness of the inorganic oxide layer is 100%, the ratio I(15) / I(65) of the intensity I(15) of the elemental ratio O / Al of aluminum to oxygen at a position 15% from the outermost surface in the depth direction to the intensity I(65) of the elemental ratio O / Al of aluminum to oxygen at a position 65% from the outermost surface is 1.05 or more and 1.45 or less.

5. The laminate according to any one of claims 1 to 3, wherein, when the thickness of the inorganic oxide layer is 100%, the ratio of the maximum and minimum values ​​of O / Al in the depth direction from the outermost surface to 80% is 1.10 or less.

6. The laminate according to any one of claims 1 to 3, wherein the thickness of the inorganic oxide layer is 3 nm or more and 15 nm or less.

7. The laminate according to any one of claims 1 to 3, wherein the polyolefin resin film comprises polypropylene.

8. The laminate according to any one of claims 1 to 3, wherein the loss tangent tanδ at 145°C in the direction of the principal orientation axis is 0.25 or less.

9. The inorganic oxide layer contains an amorphous structure and has a surface density of 50 × 10 １５ atoms / cm ２ or more and 65 × 10 １５ atoms / cm ２ or less. The laminate according to any one of claims 1 to 3.

10. The laminate according to any one of claims 1 to 3, having a coating layer on the side of the inorganic oxide layer opposite to the polyolefin resin film.

11. The laminate according to claim 10, wherein the coating layer comprises at least one selected from vinyl alcohol resin, polyol resin, and polycarboxylic acid resin.

12. The laminate according to claim 11, wherein the coating layer comprises a siloxane compound.

13. The laminate according to claim 7, wherein the mass ratio of polypropylene contained in the polyolefin resin film is 50% or more.

14. A packaging body having the laminate according to any one of claims 1 to 3.

15. A packaging body having a laminate according to any one of claims 1 to 3, wherein the mass ratio of polyolefin resin to the packaging body is 70% or more.

16. A method for manufacturing a laminate according to claim 1, wherein the laminate has an inorganic oxide layer on at least one surface of the polyolefin resin film, comprising the step of evaporating aluminum by vacuum deposition and introducing oxygen into the aluminum vapor to form an inorganic oxide layer on the surface of the polyolefin resin film.

17. The method for manufacturing a laminate according to claim 16, characterized in that, in the step of forming an inorganic oxide layer, oxygen is introduced from the upstream and / or downstream side of the transport of the polyolefin resin film in the direction of higher aluminum vapor concentration.

18. A method for producing a laminate according to claim 16 or 17, comprising forming an inorganic oxide layer on at least one surface of a polyolefin resin film, and then exposing the inorganic oxide layer to an atmosphere containing an oxidizing gas.

19. A method for producing a laminate according to claim 16 or 17, wherein an inorganic oxide layer is formed on at least one surface of a polyolefin resin film, and then the film is aged under humidification and / or heating conditions.

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