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Optical thin films, polarizers, and image display devices using them

By stacking a hard coating layer and a low refractive index layer in the optical thin film, the adhesion problem of the optical thin film when stored in a long roll shape is solved, achieving thinning and high productivity, while maintaining image reflection and black density, making it suitable for liquid crystal display devices.

Active Publication Date: 2019-06-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is desired to provide a hard coat film on the surface of the optically anisotropic layer (usually formed by providing a hard coat layer on a transparent support), it becomes hard coat / transparent support / adhesive layer / optical anisotropic Layer / alignment film / transparent support / polarizer / protective film, there is a problem that the surface part (polarizer) becomes thicker

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0468] As the solvent used for the preparation of the coating liquid, an organic solvent is preferably used. Examples of organic solvents include amides (such as N,N-dimethylformamide), sulfoxides (such as dimethylsulfoxide), heterocyclic compounds (such as pyridine), hydrocarbons (such as benzene, hexane), alkyl Halides (e.g. chloroform, methylene chloride), esters (e.g. methyl acetate, ethyl acetate, butyl acetate), ketones (e.g. acetone, methyl ethyl ketone), ethers (e.g. tetrahydrofuran, 1,2-dimethoxyethane ). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.

[0469] [Coating method]

[0470] Coating of the coating liquid can be performed by known methods (for example, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method).

[0471] [Orientation film]

[0472]In the present invention, it is preferable to apply the composition on the surface o...

Embodiment 1

[0500] (Manufacturing of Optical Film 101)

[0501] "Formation of Optically Anisotropic Layers Containing Liquid Crystalline Compounds"

[0502] (alkaline saponification treatment)

[0503] As a transparent support, use TD80UL (manufactured by Fujifilm Co., Ltd., thickness 80 μm), pass it through an induction heating roller at a temperature of 60°C, raise the surface temperature of the film to 40°C, and then place the film on the belt Surface the alkaline solution of the composition shown below with a bar coater at 14ml / m 2 Coated with a coating amount of , it was conveyed under a steam-type far-infrared heater made by Noritake Co. Limited, which had been heated to 110° C., in 10 seconds. Next, use a bar coater in the same way to apply 3ml / m 2 of pure water. Then, after repeating water washing with a fountain coater and dewatering with an air knife three times, it was transported to a drying area at 70°C for 10 seconds and dried to produce an alkali-saponified coating. Ce...

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Abstract

This invention provides an optical thin film that imparts phase difference and surface scratch resistance, and provides a polarizer that meets the requirements of thinness, has no image reflection, and has excellent black density, as well as a polarizer and a liquid crystal display device using the optical thin film. The optical thin film has an optically anisotropic layer formed of a curable resin composition on the outermost surface of one side of a transparent support, and on the other side, in the order of the transparent support, a hard coating, and a low-refractive-index layer, a hard coating, and a low-refractive-index layer, a refractive index of 1.20–1.45, and an average film thickness of 50–120 nm; the low-refractive-index layer contains inorganic particles A with an average particle size of 30 nm–65 nm, inorganic particles B with an average particle size greater than 65 nm and less than 130 nm, and a binder; the content of inorganic particles B relative to the total solid content of the low-refractive-index layer is 1.5–15% by mass; the arithmetic mean roughness Ra of the optical thin film surface on the side having the low-refractive-index layer is less than 0.030 μm according to JIS B0601-2001.

Description

technical field [0001] The present invention relates to an optical film having an optically anisotropic layer on one side of a transparent support, a hard coat layer and a low-refractive index layer on the other side, a polarizer having the optical film, and an image display device. In particular, the present invention relates to an optical film suitable for use as a surface film for a liquid crystal display device, a polarizing plate including the optical film as a protective film, and the optically anisotropic layer in such a way that the hard coat layer becomes the viewing side and the optically anisotropic layer A liquid crystal display device in which the optical film is disposed on the surface so as to be on the polarizing film side. Background technique [0002] Liquid crystal display devices (LCDs) are widely used due to their thin thickness, light weight, and low power consumption. A liquid crystal display device includes a liquid crystal unit and a polarizer. A p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/04G02B5/30G02F1/1335B32B7/02B32B27/30C08K3/00C08L101/00G02B1/10G02B1/11G02B1/111G02B1/14G02F1/13363
CPCG02B5/3008G02B5/305Y10T428/24364G02B1/14C09K2323/033G02B5/30G02F1/133528
Owner FUJIFILM CORP
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