Optical film, polarizing plate, and image display device

Patent metadata

Field	Value
Publication number	US-11644604-B2
Application number	US-201816130327-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Mar 25, 2016
Publication date	May 9, 2023
Grant date	May 9, 2023

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,
wherein a refractive index of the hard coat layer at a wavelength of 435 nm is 1.73 or more and 1.89 or less,
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;
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.

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

3. 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.

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

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

6. 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,
wherein a refractive index of the hard coat layer at a wavelength of 435 nm is 1.73 or more and 1.89 or less,
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;
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.

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

8. The optical film according to claim 6 ,
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.

9. 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,
wherein a refractive index of the hard coat layer at a wavelength of 435 nm is 1.78 or more and 1.93 or less,
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;
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.

10. The optical film according to claim 9 ,
wherein the base material contains aramid.

11. The optical film according to claim 9 ,
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.

Assignees

• Fujifilm Corp

Inventors

• Matsumoto Ayako
• Ibuki Shuntaro

Classifications

• B32B7/023

  Optical properties · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• G02B5/305 Primary

  including organic materials, e.g. polymeric layers · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• B32B2307/42

  Polarizing, birefringent, filtering · CPC title