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Film for optical use, laminate, and touch panel

A thin-film, optical technology, used in optics, optical components, coatings, etc.

Inactive Publication Date: 2010-03-24
KIMOTO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, such interference fringes can be solved by completely eliminating the uneven thickness of the transparent hard coat film, but with the current film-making precision, it is difficult to completely eliminate the problem of uneven thickness of the transparent hard coat film

Method used

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  • Film for optical use, laminate, and touch panel
  • Film for optical use, laminate, and touch panel
  • Film for optical use, laminate, and touch panel

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0105] First, a coating liquid for a primer layer, a coating liquid for a clear hard coat layer, and a coating liquid for an antireflection layer are prepared.

[0106]

[0107] · Polyester resin 1 part

[0108] (elitel UE3200, UNITIKA)

[0109] · 32 parts of dilution solvent

[0110]

[0111] ・Ionizing radiation curable resin 100 parts

[0112] (Solid component 35%, Hitaloid7975, Hitachi Chemical Co., Ltd.)

[0113] ·Photopolymerization initiator 1 part

[0114] (IRGACURE184, CIBASPECIALTY CHEMICALSK)

[0115] ·Dipentaerythritol hexaacrylate 12 parts

[0116] In addition, Hitaloid 7975 contained in the coating liquid for a clear hard coat layer contains acryl acrylate as a main oligomer component of the prepolymer.

[0117]

[0118] ・Silica sol (silicon dioxide component: 10%) 200 parts

[0119] · 250 parts of porous silica microparticle dispersion

[0120] (Silica component: 5%, average particle size: 55nm)

[0121] · 350 parts of isopropanol

[0122] · 350 p...

experiment example 2

[0136] A coating liquid was prepared under the same conditions as in Experimental Example 1 except for using a coating liquid for a clear hard coat prepared according to the following recipe, and a film sample was obtained. Furthermore, the same measurement and evaluation as in Experimental Example 1 were performed. The results are shown in Table 1.

[0137]

[0138] ・10 parts of ionizing radiation curable resin

[0139] (BEAMSET 575, Arakawa Chemical Industry Co., Ltd.)

[0140] ·Photopolymerization initiator 0.5 parts

[0141] (IRGACURE 184, CIBA JAPAN Corporation)

[0142] · 10 parts of diluting solvent

[0143] In addition, BEAMSET575 contained in the coating liquid for clear hard-coat layers contains urethane acrylate as a main oligomer component of a prepolymer.

[0144] In this experimental example, the prepared transparent hard coat coating liquid is applied to the bottom layer 14 by the bar coating method, and dried to form a coating film, and the coating film ...

experiment example 3

[0146] Except for using a transparent polymer film (polyethylene naphthalate, refractive index: 1.75) with a thickness of 100 μm as the transparent base layer 12, the coating liquid was prepared under the same conditions as in Experimental Example 1 to obtain a film. sample. The same measurement and evaluation as in Experimental Example 1 were performed. The results are shown in Table 1.

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Abstract

An optical film that can make interference fringes inconspicuous with maintaining high surface hardness and transmission sharpness is provided. The optical film 1 has a transparent base material layer12. An undercoat layer 14 is laminated on at least one surface of the transparent base material layer 12. A transparent hard coat layer 16 is laminated on the undercoat layer 14. An anti-reflection layer 18 is laminated on the transparent hard coat layer 16. The anti-reflection layer 18 is a layer having a low refractive index smaller than the refractive index of the transparent hard coat layer 16. The layers are designed so that refractive index n0 of the transparent base material layer 12, refractive index n1 of the undercoat layer 14, refractive index n2 of the transparent hard coat layer16, and refractive index n3 of the anti-reflection layer 18 should satisfy the relationships of n3<n2|<=n1|<=n0, and (n0-n3)|<=0.5.

Description

technical field [0001] The present invention relates to an optical film, a laminate, and a touch panel. Background technique [0002] In a known optical film (Patent Document 1), a transparent resin film (hereinafter referred to as "transparent hard coat film") having high surface hardness and hardly being scratched is formed on the surface of a transparent base film. [0003] [Patent Document 1] Japanese Patent Laid-Open No. 2003-334891 Contents of the invention [0004] However, the optical film described in Patent Document 1 has a problem that interference fringes are clearly visible. Theoretically, such interference fringes can be solved by completely eliminating the uneven thickness of the transparent hard coat film, but it is difficult to completely eliminate the problem of uneven thickness of the transparent hard coat film under the current film-making precision. [0005] As a countermeasure against interference fringes due to uneven thickness, it is conceivable t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/11B32B7/02G02B1/10G06F3/041
CPCG02B1/105G02B1/111Y10T428/24942G02B1/16G02B1/14G06F3/041
Inventor 野泽和洋斋藤正登
Owner KIMOTO CO LTD
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