Stacked optical films and image display devices

JP2026093445APending Publication Date: 2026-06-09NITTO DENKO CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
NITTO DENKO CORP
Filing Date
2024-11-28
Publication Date
2026-06-09

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Benefits of technology

【0027】 本発明に係る積層光学フィルムは、3枚の光学フィルムが第1接着剤層および第2接着剤層で積層されており、第2接着剤層が、硬化性成分および金属酸化物粒子を含有する積層光学フィルム用接着剤組成物の硬化物層で形成されている。硬化性成分および金属酸化物粒子を含有する積層光学フィルム用接着剤組成物の硬化物層は、(1)屈折率が高く、かつ(2)硬化収縮率が低減されている。上記(2)に起因して、3枚の光学フィルムのうち、2枚の光学フィルムが第2接着剤層を介して積層される際、第2接着剤層の硬化収縮が抑制され、第2接着剤層を介して積層される2枚の光学フィルムの表面凹凸の発生が抑制される。加えて、上記(1)に起因して、各光学フィルムと第2接着剤層との間の屈折率差が低減できる。したがって、積層光学フィルムを構成する各光学フィルムの表面凹凸に起因した干渉ムラ、さらには各光学フィルムと接着剤層との間の屈折率差に起因した干渉ムラの発生を抑制することができる。その結果、本発明に係る積層光学フィルムは、干渉ムラの発生が十分に抑制できるため、視認性に優れる。

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Abstract

To provide a laminated optical film that suppresses interference unevenness and has excellent visibility, and an image display device equipped with the laminated optical film. [Solution] A laminated optical film comprising a first optical film, a first adhesive layer, a second optical film, a second adhesive layer, and a third optical film, laminated in this order, wherein the first adhesive layer is a cured layer of an organosilicon compound adhesive having at least one reactive group selected from the group consisting of silanol groups and alkoxysilyl groups, and the second adhesive layer is a cured layer of an adhesive composition for laminated optical films containing a curable component and metal oxide particles. Preferably, the thickness of the first adhesive layer is 1 to 300 nm, and the thickness of the second adhesive layer is 100 to 3000 nm. Preferably, both the first optical film and the second optical film are liquid crystal phase difference films.
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Claims

1. A laminated optical film comprising a first optical film, a first adhesive layer, a second optical film, a second adhesive layer, and a third optical film, laminated in this order. The first adhesive layer is a cured layer of an organosilicon compound adhesive having at least one reactive group selected from the group consisting of silanol groups and alkoxysilyl groups. A laminated optical film characterized in that the second adhesive layer is a cured layer of an adhesive composition for laminated optical films containing a curable component and metal oxide particles.

2. The laminated optical film according to claim 1, wherein the thickness of the first adhesive layer is 1 to 300 nm.

3. The laminated optical film according to claim 1, wherein the thickness of the second adhesive layer is 100 to 3000 nm.

4. The laminated optical film according to claim 1, wherein the adhesive composition for the laminated optical film contains 10 to 50% by mass of the metal oxide particles when the total amount in the composition is 100% by mass.

5. The laminated optical film according to claim 1, wherein the adhesive composition for the laminated optical film further contains a (meth)acrylate containing an aromatic ring skeleton.

6. The laminated optical film according to claim 5, wherein the adhesive composition for the laminated optical film contains 30 to 70% by mass of (meth)acrylate containing the aromatic ring skeleton, when the total amount in the composition is 100% by mass.

7. The laminated optical film according to claim 5, wherein the (meth)acrylate containing the aromatic ring skeleton contains at least one selected from the group consisting of (meth)acrylates having a polycyclic aromatic ring skeleton and (meth)acrylates having two or more aromatic rings.

8. The laminated optical film according to claim 5, wherein the (meth)acrylate containing the aromatic ring skeleton is phenoxybenzyl (meth)acrylate.

9. The laminated optical film according to claim 1, wherein the adhesive composition for the laminated optical film further contains a hydroxyl group-containing (meth)acrylate.

10. The laminated optical film according to claim 9, wherein the adhesive composition for the laminated optical film has a content of 1 to 30% by mass of the hydroxyl group-containing (meth)acrylate when the total amount in the composition is 100% by mass.

11. The laminated optical film according to claim 1, wherein the viscosity of the adhesive composition for the laminated optical film at 25°C is 100 [mPa·s] or less.

12. The laminated optical film according to claim 1, wherein the refractive index of the first adhesive layer is 1.42 or greater.

13. The laminated optical film according to claim 1, wherein the refractive index of the second adhesive layer is 1.55 or greater.

14. The laminated optical film according to claim 1, wherein the refractive index of both the first optical film and the second optical film is 1.55 or higher.

15. The laminated optical film according to claim 1, wherein both the first optical film and the second optical film are liquid crystal phase difference films.

16. The laminated optical film according to claim 1, wherein the third optical film is a polarizing film comprising at least a polarizer.

17. An image display device comprising the laminated optical film described in claim 1.

18. An organic EL display device comprising the laminated optical film described in claim 1.