Optical laminates, optical laminates with polarizing films, and image display devices.

Abstract

The present invention provides an optical laminate comprising a first liquid crystal alignment solidification layer, an adhesive sheet, and a second liquid crystal alignment solidification layer in that order, which is suitable for improving the display characteristics of an image display device and improving the productivity of the optical laminate. [Solution] The optical laminate provided comprises a first liquid crystal alignment solidification layer, an adhesive sheet, and a second liquid crystal alignment solidification layer in that order, wherein the thickness of the adhesive sheet is less than 20 μm, and when the average refractive index of the adhesive sheet is n, the average refractive index of the first liquid crystal alignment solidification layer is n1, and the average refractive index of the second liquid crystal alignment solidification layer is n2, the absolute value of the value calculated by the formula {(n1+n2) / 2-n} is less than 0.11, and the adhesive sheet contains at least one selected from the group consisting of monomers and oligomers, and the content of monomers and oligomers in the adhesive sheet is 400 to 130,000 ppm (by mass).

Claims

1. An optical laminate comprising a first liquid crystal alignment solidification layer, an adhesive sheet, and a second liquid crystal alignment solidification layer in this order, The thickness of the adhesive sheet is less than 20 μm. When the average refractive index of the adhesive sheet is n, the average refractive index of the first liquid crystal alignment solidification layer is n1, and the average refractive index of the second liquid crystal alignment solidification layer is n2, the absolute value of the value calculated by the formula: {(n1 + n2) / 2 - n} is less than 0.

11. The adhesive sheet comprises at least one selected from the group consisting of monomers and oligomers, The content of the monomer and oligomer in the adhesive sheet is 400 to 130,000 ppm (by weight). Optical laminate.

2. The optical laminate according to claim 1, wherein the content of the monomer and the oligomer is 500 to 70,000 ppm (by weight).

3. The optical laminate according to claim 1, wherein the adhesive sheet contains the monomer.

4. The optical laminate according to claim 1, wherein at least one layer selected from the group consisting of the first liquid crystal alignment solidification layer and the second liquid crystal alignment solidification layer is a phase difference layer.

5. The optical laminate according to claim 1, wherein the average refractive index n of the adhesive sheet is 1.55 to 1.

60.

6. The optical laminate according to claim 1, wherein the thickness of the adhesive sheet is 3 to 10 μm.

7. The optical laminate according to claim 1, wherein the variation in the thickness of the adhesive sheet is 0.5 μm or less.

8. The optical laminate according to claim 1, wherein the adhesive sheet is formed from an adhesive composition containing a polymer obtained by polymerizing monomer component M.

9. The optical laminate according to claim 8, wherein the polymer is an acrylic polymer.

10. The optical laminate according to claim 8, wherein the monomer component M includes an aromatic ring-containing monomer.

11. The optical laminate according to claim 8, wherein the monomer in the adhesive sheet is derived from the monomer component M.

12. The optical laminate according to claim 1, wherein the monomer in the adhesive sheet contains an aromatic ring-containing monomer.

13. The optical laminate according to claim 1, wherein a polarizing film is provided on at least one side selected from the group consisting of the first liquid crystal alignment solidification layer side and the second liquid crystal alignment solidification layer side as viewed from the adhesive sheet.

14. An optical laminate with a polarizing film, wherein the polarizing film is provided on the side of the first liquid crystal alignment solidification layer as viewed from the adhesive sheet of the optical laminate according to any one of claims 1 to 12.

15. An optical laminate with a polarizing film, wherein the polarizing film is provided on the side of the second liquid crystal alignment solidification layer as viewed from the adhesive sheet of the optical laminate according to any one of claims 1 to 12.

16. An image display device comprising an optical laminate according to any one of claims 1 to 13.

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