Method for producing polarizing plate, polarizing plate, optical film, and image display

A manufacturing method and technology for optical films, applied in the field of polarizer manufacturing, can solve the problems of polyvinyl alcohol polarizer discoloration, reduced polarization degree, long heating time, etc. Effect

Inactive Publication Date: 2008-05-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this method requires heating and crimping, and the heating time is long, there is a problem that the polyvinyl alcohol polarizer discolors and the degree of polarization decreases significantly.
In addition, since long-time heating is required, there are problems of low production efficiency and deformation of the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] (Production of Polarizer)

[0098] A polyvinyl alcohol film having a thickness of 80 μm was dyed in a 5% by weight (weight ratio: iodine / potassium iodide=1 / 10) iodine aqueous solution. Then, it is immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide, and then stretched to 5.5 times in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide, and then immersed in 5% by weight. In potassium iodide aqueous solution, stretching was carried out. Thereafter, the air blowing process was carried out for 5 minutes at a wind speed of 3 m / s in an environment of 30° C. from both sides of the obtained film (distance from the blowing mechanism: 30 cm) using a countercurrent method, and a film with a thickness of 30 μm was obtained. Polarizer. The moisture content of the obtained polarizer was 25%.

[0099] (adhesive)

[0100] Solid content was prepared by dissolving 30 parts of methylolmel...

Embodiment 2～4、 comparative example 1～3

[0104] In Example 1, a polarizer was produced in the same manner as in Example 1, except that the thickness of the wind speed was changed as shown in Table 1 at the time of production of the polarizer. Table 1 shows the contact angle and water content of the obtained polarizer. Moreover, except having used the polarizer obtained in each example, it carried out similarly to Example 1, and produced the polarizing plate. Table 1 shows the water content of the obtained polarizing plate.

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PUM

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Abstract

The invention provides a production method, which uses polyvinyl alcohol polariscope as the polariscope and the material with low water vapor permeability as the transparent protection film to produce the Polaroid sheet with water adhesive with preferable polarization degree. The invention is the method for producing the Polaroid sheet with transparent protection film using the adhesive at one side of the polariscope. The polariscope is polyvinyl alcohol polariscope with the water vapor permeability of the transparent protection film below 150g/m<2>/24h. The adhesive is water adhesive. Before adopting the adhesive for the polariscope and the transparent protection film, the polariscope is implemented blast procedure, ensuring the contact angle of the surface of the polariscope and the water above 20 degree.

Description

technical field [0001] The present invention relates to a method of manufacturing a polarizer. Moreover, this invention relates to the polarizing plate obtained by this manufacturing method. The polarizing plate can be formed alone or as an optical film laminated with the polarizing plate to form flat panel displays such as liquid crystal display (hereinafter abbreviated as LCD) and electroluminescence display (hereinafter abbreviated as ELD), and image display devices such as PDP. Background technique [0002] Polarizers for flat panel displays, especially polarizers for LCDs, generally use polyvinyl alcohol-based films as raw materials. In addition, in order to obtain sufficient optical characteristics as an LCD, the polarizing plate is preferably produced by stretching a polyvinyl alcohol-based film containing a dichroic material such as iodine, and laminating a transparent protective film thereon. Since the above-mentioned polyvinyl alcohol-based polarizer is produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10G02F1/1335
CPCB29D11/0073G02B5/3016G02B5/30
Inventor 塘口直树杉野洋一郎岩本展明山添真宏鹰尾宽行
Owner NITTO DENKO CORP
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