Optical laminate film, infrared shielding film and infrared shielding body

Patent metadata

Field	Value
Publication number	US-9519081-B2
Application number	US-201214364507-A
Country	US
Kind code	B2
Filing date	Dec 10, 2012
Priority date	Dec 12, 2011
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

Provided are an optical laminate film superior in film flexibility and film surface uniformity, has high light transmittance in a predetermined wavelength region, and is superior in light shielding properties in another predetermined wavelength region, an infrared shielding film, a method of manufacturing an infrared shielding film, and an infrared shielding body provided with the infrared shielding film.
The optical laminate film has, on a substrate, at least one unit constituted of a high refractive index layer and a low refractive index layer containing metal oxide particles and silanol modified polyvinyl alcohol.

First claim

What is claimed is:

1. An optical laminate film comprising, on a substrate, at least one unit constituted of a high refractive index layer, and a low refractive index layer comprising metal oxide particles, unmodified polyvinyl alcohol having a polymerization degree of 1500 to 5000 and a silanol modified polyvinyl alcohol.

2. The optical laminate film according to claim 1 , wherein the silanol modified polyvinyl alcohol is contained in an amount of 10 to 25% by mass based on 100% by mass of the total solid content of the low refractive index layer.

3. The optical laminate film according to claim 2 , wherein the undermost refractive index layer closest to the substrate has a thickness of 5 to 12 times an average thickness of other refractive index layers.

4. The optical laminate film according to claim 3 , wherein the high refractive index layer comprises a second silanol modified polyvinyl alcohol.

5. The optical laminate film according to claim 4 , wherein the content of the second silanol modified polyvinyl alcohol is 1 to 40% by mass based on 100% by mass of the total solid content of the high refractive index layer.

6. The optical laminate film according to claim 1 , wherein the high refractive index layer comprises rutile type titanium oxide.

7. The optical laminate film according to claim 1 , wherein the high refractive index layer comprises a second silanol modified polyvinyl alcohol.

8. The optical laminate film according to claim 1 , wherein at least one layer of the low refractive index layer or the high refractive index layer comprises at least one kind of a boron compound selected from the group consisting of boric acid, borate salt, and borax.

9. An infrared shielding body comprising, on at least one side of a base structure, the optical laminate film according to claim 1 .

10. The optical laminate film according to claim 1 , wherein there is a region in which the reflectance is more than 50% in a region with a wavelength of 900 nm to 1400 nm.

11. The optical laminate film according to claim 10 , wherein the transmittance in a visible light region is not less than 50%.

12. The optical laminate film according to claim 11 , wherein the total number of the high refractive index layers and the low refractive index layers is not more than 100.

13. The optical laminate film according to claim 12 , wherein the entire thickness is 12 μm to 315 μm.

14. The optical laminate film according to claim 1 , wherein the film comprises at least one functional layer on the opposite side of the substrate.

15. A method of manufacturing an optical laminate film, comprising the steps of:
applying, onto a substrate, a coating liquid for low refractive index layer comprising metal oxide particles, a silanol modified polyvinyl alcohol, a binder resin and an aqueous solvent, wherein the binder resin contained in the coating liquid for the low refractive index layer comprises an unmodified polyvinyl alcohol having a polymerization degree of 1500 to 5000, and a coating liquid for high refractive index layer comprising a binder resin and an aqueous solvent; and
drying the substrate coated with the coating liquids.

16. The method of manufacturing an optical laminate film according to claim 15 , wherein the substrate comprises an undercoat layer.

17. The method of manufacturing an optical laminate film according to claim 16 , wherein the step of applying the coating liquids is a step of carrying out simultaneous multi-layer coating of the coating liquids.

18. An optical laminate film comprising, on a substrate, at least one unit constituted of a high refractive index layer comprising a first silanol modified polyvinyl alcohol, and a low refractive index layer comprising metal oxide particles and a second silanol modified polyvinyl alcohol.

19. The optical laminate film according to claim 18 , wherein the second silanol modified polyvinyl alcohol is contained in an amount of 10 to 25% by mass based on 100% by mass of the total solid content of the low refractive index layer.

20. The optical laminate film according to claim 19 , wherein the undermost refractive index layer closest to the substrate has a thickness of 5 to 12 times an average thickness of other refractive index layers.

21. The optical laminate film according to claim 19 , wherein the low refractive index layer further comprises unmodified polyvinyl alcohol having a polymerization degree of 1500 to 5000.

22. The optical laminate film according to claim 18 , wherein the content of the first silanol modified polyvinyl alcohol is 1 to 40% by mass based on 100% by mass of the total solid content of the high refractive index layer.

23. The optical laminate film according to claim 18 , wherein the high refractive index layer comprises rutile type titanium oxide.

24. The optical laminate film according to claim 18 , wherein at least one layer of the low refractive index layer or the high refractive index layer comprises at least one kind of a boron compound selected from the group consisting of boric acid, borate salt, and borax.

25. An infrared shielding body comprising, on at least one side of a base structure, the optical laminate film according to claim 18 .

26. The optical laminate film according to claim 18 , wherein there is a region in which the reflectance is more than 50% in a region with a wavelength of 900 nm to 1400 nm.

27. The optical laminate film according to claim 26 , wherein the transmittance in a visible light region is not less than 50%.

28. The optical laminate film according to claim 27 , wherein the total number of the high refractive index layers and the low refractive index layers is not more than 100.

29. The optical laminate film according to claim 28 , wherein the entire thickness is 12 μm to 315 μm.

30. The optical laminate film according to claim 18 , wherein the film comprises at least one functional layer on the opposite side of the substrate.

31. A method of manufacturing an optical laminate film, comprising the steps of:
applying, onto a substrate, a coating liquid for a high refractive index layer comprising a first silanol modified polyvinyl alcohol, a binder resin and an aqueous solvent, and a coating liquid for a low refractive index layer comprising metal oxide particles, a second silanol modified polyvinyl alcohol, a binder resin and an aqueous solvent; and
drying the substrate coated with the coating liquids.

32. The method of manufacturing an optical laminate film according to claim 31 , wherein the substrate comprises an undercoat layer.

33. The method of manufacturing an optical laminate film according to claim 32 , wherein the step of applying the coating liquids is a step of carrying out simultaneous multi-layer coating of the coating liquids.

Assignees

• Konica Minolta Inc

Inventors

• Taka Yukako
• Nojima Takahiko

Classifications

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B1/113

  using inorganic layer materials only · CPC title

• G02B1/10 Primary

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• G02B5/22

  Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} · CPC title

• C09D5/004

  Reflecting paints; Signal paints · CPC title