Light-diffusing adhesive and optical member and polarizing plate using said light-diffusing adhesive

An adhesive and light diffusion technology, applied in the directions of polymer adhesive additives, optical elements, polarizing elements, etc., can solve the problems of insufficient visibility and uneven corners, and achieve excellent visibility, increase Refractive index difference, no corner uneven effect

Active Publication Date: 2015-05-13
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an image display device using a light-diffusing adhesive including an acrylic adhesive has a problem of uneven corners and insufficient visibility in a high-temperature environment.

Method used

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  • Light-diffusing adhesive and optical member and polarizing plate using said light-diffusing adhesive
  • Light-diffusing adhesive and optical member and polarizing plate using said light-diffusing adhesive
  • Light-diffusing adhesive and optical member and polarizing plate using said light-diffusing adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] 1. Preparation of Light Diffusion Adhesive

[0135] 1-1. Preparation of the base polymer (acrylic polymer) of the adhesive

[0136] 74.9 parts of butyl acrylate, 20 parts of benzyl acrylate, 5 parts of acrylic acid, 0.1 part of 4-hydroxybutyl acrylate, and 0.1 part of 2,2'-azobisisobutyronitrile and 100 parts of ethyl acetate were added together (the concentration of the monomer was 50%), and nitrogen gas was introduced while stirring slowly to carry out nitrogen replacement. The liquid temperature was maintained at around 55° C., and a polymerization reaction was performed for 8 hours to prepare a solution of an acrylic polymer having a weight average molecular weight (Mw) of 2,040,000 and Mw / Mn=3.2.

[0137] 1-2. Preparation of light diffusing adhesive

[0138] With respect to 100 parts of the solid content of the acrylic polymer solution obtained above, 0.45 parts of an isocyanate crosslinking agent (Coronate L manufactured by Nippon Polyurethane Industry Co., Ltd....

Embodiment 2

[0146] The light-diffusing adhesive was prepared according to the recipe shown in Table 1. Except having used this light-diffusion adhesive, it carried out similarly to Example 1, and produced the polarizing plate with a light-diffusion adhesive layer. The adhesive, the light-diffusion adhesive, and the polarizing plate with a light-diffusion adhesive layer were subjected to the same evaluation as Example 1. The results are shown in Table 1.

Embodiment 3

[0148] The light-diffusing adhesive was prepared according to the recipe shown in Table 1. Except having used this light-diffusion adhesive, it carried out similarly to Example 1, and produced the polarizing plate with a light-diffusion adhesive layer. The adhesive, the light-diffusion adhesive, and the polarizing plate with a light-diffusion adhesive layer were subjected to the same evaluation as Example 1. The results are shown in Table 1.

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Abstract

Provided is a light-diffusing adhesive that can achieve an image display device having superior visibility without the occurrence of corner unevenness even in high-temperature environments. The light-diffusing adhesive includes: an adhesive containing a base polymer containing a (meth)acrylate polymer; and light-diffusing microparticles having a refractive index lower than that of the adhesive. The (meth)acrylate polymer contains an aromatic ring-containing (meth)acrylate monomer as the monomer unit.

Description

technical field [0001] The invention relates to a light-diffusing adhesive. More specifically, the present invention relates to a light-diffusing adhesive including an aromatic ring-containing (meth)acrylic monomer as a monomer unit of a base polymer. Furthermore, this invention relates to the polarizing plate and optical member which used such a light-diffusion adhesive. Background technique [0002] The backlight unit of the liquid crystal display device may contain a diffusion sheet to suppress stripes (interference stripes) generated when regular structures overlap each other, dot patterns of the light guide plate, and color spots of the liquid crystal panel to improve visibility. However, when sufficient visibility cannot be ensured only by a diffusion sheet, a light-diffusion adhesive can be used as an adhesive layer of a polarizing plate. The light-diffusing adhesive is provided with a light-diffusing function by adding light-diffusing fine particles to the adhesive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02C09J11/08C09J133/04G02B5/04G02B5/30G02F1/1335
CPCC09J11/08C09J133/04G02B5/0242G02B5/045G02B5/30G02F1/133528C08K7/00G02B5/0289G02B5/305G02F1/133504G02F2202/28
Inventor 渊田岳仁中村恒三前泽昌平武本博之
Owner NITTO DENKO CORP
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