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Adhesive for polarizing plate, polarizing plate, manufacturing method therefor, optical film and image display

一种偏振板、胶粘剂的技术，应用在光学、光学元件、光学元件等方向，能够解决偏振板不均等问题，达到抑制不均、满足密合性、提高成品率的效果

Active Publication Date: 2010-04-07
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the precoating method requires good wettability, there is a problem that unevenness occurs in the polarizing plate obtained by the precoating method

Method used

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  • Adhesive for polarizing plate, polarizing plate, manufacturing method therefor, optical film and image display
  • Adhesive for polarizing plate, polarizing plate, manufacturing method therefor, optical film and image display
  • Adhesive for polarizing plate, polarizing plate, manufacturing method therefor, optical film and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] (polarizer)

[0133] A polyvinyl alcohol film having an average degree of polymerization of 2400 and a degree of saponification of 99.9 mol % was immersed in warm water at 30° C. to swell with a thickness of 75 μm. Next, immerse in an aqueous solution with a concentration of 0.3% of iodine / potassium iodide (weight ratio = 0.5 / 8), stretch it to 3.5 times, and dye the film at the same time, and then, in a borate aqueous solution at 65°C, perform Stretch so that the total draw ratio becomes 6 times. After stretching, it was dried in a 40° C. oven for 3 minutes to obtain a polarizing plate.

[0134] (transparent protective film)

[0135] A cellulose triacetate film with a thickness of 40 μm was used as a transparent protective film 1 . As another transparent protective film 2 , a biaxially stretched norbornene-based film (manufactured by Nippon Zeon Co., Ltd., Zeonoa) having a thickness of 70 μm was used.

[0136] (preparation of adhesive)

[0137] With respect to 100 ...

Embodiment 2～4、 comparative example 1～5

[0141] In the preparation of the adhesive in Example 1, the adhesive was prepared in the same manner as in Example 1, except that the types and usage ratios of the components shown in Table 1 were changed. Moreover, using the obtained adhesive agent, it carried out similarly to Example 1, and produced the polarizing plate.

Embodiment 5

[0143] In Example 2, in addition to being the transparent protective film 2, a polymethyl methacrylate resin (manufactured by Mitsubishi Rayon Co., Ltd. Except VH), it carried out similarly to Example 1, and produced the polarizing plate.

[0144] (Evaluation)

[0145] The following evaluations were performed on the polarizing plates obtained in Examples and Comparative Examples.

[0146] (unevenness of polarizing plate)

[0147] In each example, about the obtained polarizing plate, the presence or absence of visible unevenness in the state was visually confirmed by the following criteria.

[0148] ⊚: In the obtained polarizing plate, unevenness was not observed even in a dark room, and there was no image display failure.

[0149] ◯: In the obtained polarizing plate, unevenness was confirmed in a dark room, but there was no image display failure.

[0150] ×: In the obtained polarizing plate, unevenness was confirmed, which had an influence on image display.

[0151] It shou...

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PUM

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Abstract

To provide an adhesive agent for a polarizing plate capable of satisfying a wetting property when a transparent protection film is coated with it and satisfying an optical characteristic, in which the obtained polarizing plate has water-resistance at a high temperature. The adhesive agent for the polarizing plate used for providing the transparent protection film on at least one surface of a polarization element is a resin solution containing a polyvinyl alcohol based resin, a crosslinking agent and a leveling agent containing a compound having an acetylene skeleton. The leveling agent is formulated at a ratio of 0.01-10 pts.wt. relative to 100 pts.wt. of the polyvinyl alcohol based resin.

Description

technical field [0001] The invention relates to an adhesive for polarizing plates. Moreover, this invention relates to the polarizing plate which used this adhesive agent for polarizing plates, and its manufacturing method. This polarizing plate can be used alone or as an optical film laminated with this polarizing plate to form an image display device such as a liquid crystal display device, an organic EL display device, or a PDP. Background technique [0002] In a liquid crystal display device, it is essential to arrange polarizing plates on both sides of a glass substrate forming the surface of a liquid crystal panel, depending on the image forming method. A polarizing plate is usually obtained by uniaxially stretching a film after dyeing a polyvinyl alcohol-based film and a dichroic material such as iodine, and then crosslinking with a crosslinking agent. Since the above-mentioned polarizing plate is produced by stretching, it tends to shrink. In addition, since the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10C09J129/04C09J11/06B32B37/12
CPCG02B5/305B29D11/0073C08K5/34922B32B7/12C09J129/04C08K5/053C08L71/02B32B23/08B32B27/08B32B27/20B32B27/28B32B27/281B32B27/285B32B27/286B32B27/302B32B27/304B32B27/306B32B27/308B32B27/32B32B27/325B32B27/34B32B27/36B32B27/365B32B27/38B32B2255/10B32B2255/26B32B2260/00B32B2270/00B32B2307/308B32B2307/412B32B2307/416B32B2307/50B32B2307/516B32B2307/518B32B2307/7242B32B2307/73B32B2457/20B32B2457/202C08L2666/14C09K2323/031Y10T428/265Y10T428/31855
Inventor 品川雅杉野晶子藤田裕佐竹正之
Owner NITTO DENKO CORP
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