Optical film, polarizing plate, and image display device

Patent metadata

Field	Value
Publication number	US-2019011607-A1
Application number	US-201816130327-A
Country	US
Kind code	A1
Filing date	Sep 13, 2018
Priority date	Mar 25, 2016
Publication date	Jan 10, 2019
Grant date	—

Abstract

Provided are an optical film including a base material, and a hard coat layer, in which a refractive index of the base material at a wavelength of 550 nm is 1.60 or more, a difference between a refractive index of the base material at a wavelength of 435 nm and a refractive index of the base material at a wavelength of 610 nm is 0.11 or more, and a peak intensity PV value of a power spectrum obtained by subjecting a reflectivity spectrum of the optical film to fast Fourier transform is 0.3 or less, a polarizing plate having the optical film and an image display device.

First claim

What is claimed is:

1 . An optical film comprising:
a base material; and a hard coat layer, wherein a refractive index of the base material at a wavelength of 550 nm is 1.60 or more, a difference between a refractive index of the base material at a wavelength of 435 nm and a refractive index of the base material at a wavelength of 610 nm is 0.11 or more, and a peak intensity PV value of a power spectrum obtained by subjecting a reflectivity spectrum of the optical film to fast Fourier transform is 0.3 or less.

2 . The optical film according to claim 1 , further comprising:
an interlayer between the base material and the hard coat layer, wherein the hard coat layer contains inorganic particles, a difference between the refractive index of the base material at a wavelength of 435 nm and a refractive index of the interlayer at a wavelength of 435 nm is 0.05 or less, a difference between the refractive index of the interlayer at a wavelength of 435 nm and a refractive index of the hard coat layer at a wavelength of 435 nm is 0.05 or less, a difference between the refractive index of the base material at a wavelength of 610 nm and a refractive index of the interlayer at a wavelength of 610 nm is 0.05 or less, and a difference between the refractive index of the interlayer at a wavelength of 610 nm and a refractive index of the hard coat layer at a wavelength of 610 nm is 0.05 or less.

3 . The optical film according to claim 1 , further comprising:
an interlayer between the base material and the hard coat layer, wherein the hard coat layer contains a polymer of a monomer having at least one skeleton selected from a fluorene skeleton, a dinaphthothiophene skeleton, a naphthalene skeleton, an anthracene skeleton, a benzotriazole skeleton, a triazine skeleton, a benzophenone skeleton, a merocyanine skeleton, a benzoxazole skeleton, a benzothiol skeleton, a triphenylene skeleton, a cinnamoyl skeleton, a bisphenol S skeleton, and a tolane skeleton, a difference between the refractive index of the base material at a wavelength of 435 nm and a refractive index of the interlayer at a wavelength of 435 nm is 0.05 or less, a difference between the refractive index of the interlayer at a wavelength of 435 nm and a refractive index of the hard coat layer at a wavelength of 435 nm is 0.05 or less, a difference between the refractive index of the base material at a wavelength of 610 nm and a refractive index of the interlayer at a wavelength of 610 nm is 0.05 or less, and a difference between the refractive index of the interlayer at a wavelength of 610 nm and a refractive index of the hard coat layer at a wavelength of 610 nm is 0.05 or less.

4 . The optical film according to claim 1 ,
wherein the base material and the hard coat layer are in contact with each other, the hard coat layer contains inorganic particles and a polymer of a monomer having at least one skeleton selected from a fluorene skeleton, a dinaphthothiophene skeleton, a naphthalene skeleton, an anthracene skeleton, a benzotriazole skeleton, a triazine skeleton, a benzophenone skeleton, a merocyanine skeleton, a benzoxazole skeleton, a benzothiol skeleton, a triphenylene skeleton, a cinnamoyl skeleton, a bisphenol S skeleton, and a tolane skeleton, a difference between the refractive index of the base material at a wavelength of 435 nm and a refractive index of the hard coat layer at a wavelength of 435 nm is 0.05 or less, and a difference between the refractive index of the base material at a wavelength of 610 nm and a refractive index of the hard coat layer at a wavelength of 610 nm is 0.05 or less.

5 . The optical film according to claim 1 ,
wherein the base material contains aramid.

6 . The optical film according to claim 2 ,
wherein the base material contains aramid.

7 . The optical film according to claim 3 ,
wherein the base material contains aramid.

8 . The optical film according to claim 4 ,
wherein the base material contains aramid.

9 . The optical film according to claim 1 ,
wherein a refractive index of the hard coat layer at a wavelength of 550 nm is 1.56 or more.

10 . The optical film according to claim 2 ,
wherein a refractive index of the hard coat layer at a wavelength of 550 nm is 1.56 or more.

11 . The optical film according to claim 3 ,
wherein a refractive index of the hard coat layer at a wavelength of 550 nm is 1.56 or more.

12 . The optical film according to claim 4 ,
wherein a refractive index of the hard coat layer at a wavelength of 550 nm is 1.56 or more.

13 . The optical film according to claim 1 ,
wherein number of times of folding endurance of the optical film measured by an MIT test machine according to JIS P8115 (2001) is 1000 or more.

14 . The optical film according to claim 2 ,
wherein number of times of folding endurance of the optical film measured by an MIT test machine according to JIS P8115 (2001) is 1000 or more.

15 . The optical film according to claim 3 ,
wherein number of times of folding endurance of the optical film measured by an MIT test machine according to JIS P8115 (2001) is 1000 or more.

16 . The optical film according to claim 4 ,
wherein number of times of folding endurance of the optical film measured by an MIT test machine according to JIS P8115 (2001) is 1000 or more.

17 . A polarizing plate comprising:
the optical film according to claim 1 .

18 . An image display device comprising:
the optical film according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Matsumoto Ayako
• Ibuki Shuntaro

Classifications

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• B32B2307/418

  Refractive · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title