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Anti-Reflection Film, Manufacturing Method Thereof, Polarizing Plate and Transmission Type LCD

a technology of anti-reflection film and manufacturing method, which is applied in the direction of identification means, instruments, polarising elements, etc., can solve the problems of low productivity and decrease in display quality, and achieve excellent optical properties and low production cost

Inactive Publication Date: 2010-09-09
TOPPAN PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]An anti-reflection film with low production costs is demanded. In addition, an anti-reflection film with excellent anti-reflection properties and free from an interference fringe is demanded. The present invention aims to provide an anti-reflection film with excellent anti-reflection properties at a low production cost.
[0035]In the case of the anti-reflection film of the present invention, in which low refractive index particles are localized in the localized layer, it is possible to reduce total usage of the conductive particles relative to the case where a low refractive index layer is separately formed. Accordingly, it is possible to prevent a surface strength decrease and visible light transmittance decrease caused by an excessive addition of the low refractive index particles. In addition, it is also possible to save time for producing the anti-reflection film and reduce production costs relative to the case where the low refractive index layer is formed separately from the hard coat layer because a layer of the low refractive index function and a layer of the hard coat function are formed simultaneously.
[0036]In addition, the anti-reflection film of the present invention has the mixed layer. Since the composition (a ratio of the transparent substrate component and the binder matrix) in the mixed layer varies with gradient and the mixed layer is optically indistinguishable, the mixed layer absorbs a difference in refractive index between both adjacent layers (the transparent substrate and the localized layer) so that the interference generation caused by this difference is prevented.
[0038]It is possible to provide an anti-reflection film having excellent optical properties at a low production cost by making the anti-reflection film of the present invention as described above.

Problems solved by technology

The external light incident to a display surface is reflected on the surface so that a displayed image is interfered with by the reflected image and the quality of display decreases.
In the case where the anti-reflection layer is formed by a dry coating method, while there is an advantage of fine thickness controllability, there is also a problem of low productivity due to a limitation of a deposition process performed in a vacuum chamber, which is unsuitable for mass production.

Method used

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  • Anti-Reflection Film, Manufacturing Method Thereof, Polarizing Plate and Transmission Type LCD
  • Anti-Reflection Film, Manufacturing Method Thereof, Polarizing Plate and Transmission Type LCD
  • Anti-Reflection Film, Manufacturing Method Thereof, Polarizing Plate and Transmission Type LCD

Examples

Experimental program
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Effect test

example 1

Transparent Substrate

[0162]An 80 μm thick triacetyl cellulose film (refractive index: 1.49) was prepared as the transparent substrate.

[0163]6.0 parts by weight of a dispersion liquid of low refractive index silica particles having pores therein (primary particle diameter: 30 nm, solid content ratio: 20 wt %, dispersion solvent: isopropyl alcohol), 7.8 parts by weight of dipentaerythritol hexaacrylate (DPHA), 23.3 parts by weight of pentaerythritol tetraacrylate (PETA) and 7.8 parts by weight of urethane acrylate UA-306T (made by Kyoeisha chemical Co., Ltd.) as the ionizing radiation curable material, 2.0 parts by weight of Irgacure 184 (by Ciba Japan) as the photopolymerization initiator, and 55.2 parts by weight of a solvent mixture of methyl ethyl ketone, isopropyl alcohol and diacetone alcohol having a blend ratio of 6:2:2 as the solvent were blended together to prepare a coating liquid for forming a low refractive index hard coat layer with a solid content ratio of 40 wt % by we...

example 2

Transparent Substrate

[0165]An 80 μm thick triacetyl cellulose film (refractive index: 1.49) was prepared as the transparent substrate.

[0166]2.0 parts by weight of a dispersion liquid of low refractive index silica particles having pores therein (primary particle diameter: 30 nm, solid content ratio: 20 wt %, dispersion solvent: isopropyl alcohol), 4.9 parts by weight of dipentaerythritol hexaacrylate (DPHA), 14.7 parts by weight of pentaerythritol tetraacrylate (PETA) and 4.9 parts by weight of urethane acrylate UA-306T (made by Kyoeisha chemical Co., Ltd.) as the ionizing radiation curable material, 2.0 parts by weight of Irgacure 184 (by Ciba Japan) as the photopolymerization initiator, 16.7 parts by weight of conductive polymer Baytron P CH 8000 (solid content ratio: 3%), 0.5 parts by weight of modified silicone oil TSF44 (made by GE Toshiba silicone Ltd.), and 56.6 parts by weight of a solvent mixture of methyl ethyl ketone, isopropyl alcohol and diacetone alcohol having a blend...

example 3

Transparent Substrate

[0168]An 80 μm thick triacetyl cellulose film (refractive index: 1.49) was prepared as the transparent substrate.

[0169]6.0 parts by weight of a dispersion liquid of magnesium fluoride (MgF2) (primary particle diameter: 20 nm, solid content ratio: 20 wt %, dispersion solvent: isopropyl alcohol), 7.8 parts by weight of dipentaerythritol hexaacrylate (DPHA), 23.3 parts by weight of pentaerythritol tetraacrylate (PETA) and 7.8 parts by weight of urethane acrylate UA-306T (made by Kyoeisha chemical Co., Ltd.) as the ionizing radiation curable material, 2.0 parts by weight of Irgacure 184 (by Ciba Japan) as the photopolymerization initiator, and 55.2 parts by weight of a solvent mixture of methyl ethyl ketone, N-methylpyrrolidone and diacetone alcohol having a blend ratio of 5:2:3 as the solvent were blended together to prepare a coating liquid for forming a low refractive index hard coat layer with a solid content ratio of 40 wt % by weight.

[0170]The resultant coatin...

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Abstract

The present invention provides an anti-reflection film which has excellent optical properties at a low production cost. The anti-reflection film of the present invention has a low refractive index hard coat layer having low refractive index particles and a binder matrix which is formed by curing an ionizing radiation curable material on a transparent substrate. It is a feature of the anti-reflection film of the present invention that the low refractive index hard coat layer has two optically distinguishable layers from the transparent substrate side, namely, an intermediate layer and a localized layer wherein the low refractive index particles are localized, and the refractive index and optical thickness of the localized layer are in the range of 1.29-1.43 and in the range of 100-200 nm, respectively.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on and claims the benefit of priority from the Japanese Patent Application number 2009-054809, filed on Mar. 9, 2009, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an anti-reflection film which is arranged in order to prevent external light from reflecting on a window or a surface of display devices etc. Specifically, the present invention relates to an anti-reflection film applied on a surface of a liquid crystal display (LCD), CRT display, organic electroluminescent display (ETD), plasma display (PDP), surface-conduction electron-emitter display (SED) and field emission display (FED) etc. Among these, this invention relates to an anti-reflection film applied on a surface of an LCD, especially a transmission type LCD.[0004]2. Description of the Related Art[0005]In general, displays are used under e...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K19/00C08F2/46G02B1/10B32B7/02G02B1/11G02B1/111G02B1/14G02B5/30G02F1/1335G09F9/00
CPCC08F2/48G02B1/111Y10T428/265Y10T428/1086G02B1/118C09K2323/06C09D5/006G02B1/11
Inventor YOSHIHARA, TOSHIAKI
Owner TOPPAN PRINTING CO LTD
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