Laminated film and packaging bag

1. A laminated film, comprising:

a resin substrate;

a coating layer on the resin substrate; and,

a deposited thin film layer in between the resin substrate and the coating layer, the deposited thin film layer contains a silicon oxide and has a thickness of 5 to 100 nm,

wherein the coating layer contains a water-soluble polymer, at least one of a silane coupling agent and a hydrolysate thereof, at least one of a metal alkoxide and a hydrolysate thereof, and an inorganic layered compound, and

wherein the content of the inorganic layered compound in the coating layer is 2 to 10 mass %.

2. The laminated film of claim 1 , wherein the resin substrate has a biaxially oriented polypropylene film.

3. The laminated film of claim 1 , wherein the laminated film includes an underlayer between the resin substrate and the coating layer.

4. The laminated film of claim 3 , wherein

the underlayer contains an organic polymer as a main component, and

the organic polymer contains at least one of polyols, organosilane compounds, water-based polyurethane resins, and reaction products of the polyols and the organosilane compounds.

5. The laminated film of claim 1 , wherein at least one of the silane coupling agent and the hydrolysate thereof has an epoxy group.

6. The laminated film of claim 1 , wherein the content of the silane coupling agent and the hydrolysate thereof in the coating layer is 1 to 15 mass % in total.

7. The laminated film of claim 1 , wherein the laminated film has a lamination strength of 2 N/15 mm or more.

8. The laminated film of claim 1 , wherein the laminated film has a moisture permeation rate of 2 g/m 2 /day or less.

9. The laminated film of claim 1 , wherein the laminated film has an oxygen permeation rate of 2 ml/m 2 /day or less.

10. A packaging bag

comprising the laminated film of claim 1 .

11. The laminated film of claim 1 , wherein the content of the inorganic layered material in the coating layer is from 2 mass % to 5 mass %.

12. The laminated film of claim 11 , wherein the content of the inorganic layered material in the coating layer is from 3 mass % to 5 mass %.

13. The laminated film of claim 11 , wherein the inorganic layered material is montmorillonite.

14. A laminated film, comprising:

a resin substrate having a biaxially oriented polypropylene film;

a deposited thin film layer, which contains a silicon oxide and has a thickness of 5 to 100 nm;

an underlayer containing an organic polymer as a main component, the underlayer being located between the resin substrate and the deposited thin film layer; and

a coating layer on a side opposite to the underlayer side of the deposited thin film layer, the coating layer contains a water-soluble polymer, at least one of a silane coupling agent and a hydrolysate thereof, at least one of a metal alkoxide and a hydrolysate thereof, and an inorganic layered compound, wherein the content of the inorganic layered compound in the coating layer is 2 to 10 mass %.

15. The laminated film of claim 14 , wherein the organic polymer in the underlayer contains at least one of polyols, organosilane compounds, water-based polyurethane resins, and reaction products of the polyols and the organosilane compounds.

16. The laminated film of claim 14 , wherein the laminated film has a lamination strength of 2 N/15 mm or more.

17. The laminated film of claim 14 , wherein the laminated film has a moisture permeation rate of 2 g/m 2 /day or less.

18. The laminated film of claim 14 , wherein the laminated film has an oxygen permeation rate of 2 ml/m 2 /day or less.

19. A packaging bag

comprising the laminated film of claim 14 .

20. The laminated film of claim 14 , wherein the content of the inorganic layered material in the coating layer is from 2 mass % to 5 mass %.

21. The laminated film of claim 20 , wherein the inorganic layered material is montmorillonite.