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Manufacturing method of polarizing plate

A manufacturing method and polarizing plate technology, which is applied to polarizing elements, chemical instruments and methods, instruments, etc., can solve the problems of polarizing plate curling, air bubbles, and poor transportability of polarizing plates, and achieve the effect of suppressing curling

Active Publication Date: 2017-10-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when laminating the polarizing plate and the transparent protective film by the lamination method described above, there is a problem that curling occurs in the resulting polarizing plate.
If the curl is large, air bubbles will be mixed when the obtained polarizing plate (such as a polarizing plate) is bonded to other members (such as a liquid crystal cell, etc.), which will cause a process defect
In addition, since the transportability of the curled polarizing plate is also deteriorated, there is a problem that stable production cannot be produced.

Method used

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  • Manufacturing method of polarizing plate
  • Manufacturing method of polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114]

[0115] use figure 1 By the method shown, a polarizing plate was produced. As the polarizing plate A, the above-mentioned polarizing plate was used. The 50-micrometer-thick cyclic polyolefin film mentioned above was used for the 1st transparent protective film B1. After forming a 0.5 μm-thick urethane-based easy-adhesion layer on the cyclic polyolefin film, an MCD coater (manufactured by Fuji Machine Co., Ltd.) (unit shape: honeycomb, gravure) was used on the easy-adhesion layer. Number of rolls: 1000 rolls / inch, rotation speed 140% / relative to line speed), and the active energy ray-curable adhesive was applied so that the thickness of the adhesive layer was 0.5 μm. Except having used the TAC film as the 2nd transparent protective film B2 instead of the said cyclic polyolefin film, it carried out similarly to the above, and produced the TAC film with an adhesive layer. Then, the said 1st transparent protective film B1 and the 2nd transparent protective film B2 wer...

Embodiment 2～4、 comparative example 1～4

[0117] In Example 1, except having changed the type of the first transparent protective film, the second transparent protective film, the type of the first roll, and the second roll as shown in Table 1, it was carried out in the same manner as in Example 1. , to obtain a polarizing plate.

[0118] The following evaluation was performed about the polarizing plate produced in the Example and the comparative example. The results are shown in Table 1.

[0119] (curly)

[0120] The obtained polarizing plate was left still on a horizontal plate, and the length of the portion where the distance between the edge of the polarizing plate and the horizontal plate became the largest was defined as the curling amount (mm).

[0121] (Appearance: Confirmation of air bubbles)

[0122] A sample of 1000 mm×1000 mm was cut out from the obtained polarizing plate, and the number of air bubbles between the polarizing plate and the transparent protective film was confirmed.

[0123]

[0124] ...

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Abstract

The invention provides a method for producing a polarizing plate, and the method is used for manufacturing the polarizing plate which is formed by pasting ttransparent protection films on two surfaces of a polarizing sheet between a pair of rollers. The method can inhibit crimping and curving. According to the method, a first transparent protection film and a second transparent protection film, which are different in elasticity and defined through a value of the formula: elasticity modulus (MPa)*thickness (micron), are partitioned by a bonding layer, and are enabled to pass through the pair of rollers with different hardness at the same time to be attached to two surfaces of the polarizing sheet. In the above pair of rollers, a high-elasticity film is delivered from a low-hardness roller side, and a low-elasticity film is delivered from a high-hardness roller side.

Description

technical field [0001] The present invention relates to a method for producing a polarizing plate in which a first transparent protective film and a second transparent protective film are bonded to both surfaces of a polarizing plate via an adhesive layer. Background technique [0002] Conventionally, a polarizing plate is manufactured by bonding a transparent protective film to both surfaces of a polarizing plate having a predetermined moisture content, and in this case, a water-based adhesive or an adhesive is usually used. As a method of laminating the transparent protective film on both sides of the polarizer, for example, the polarizer is conveyed between a pair of rolls, and the transparent protective film is conveyed on both sides while laminating the transparent protective film at the same time; The successive lamination method in which the transparent protective film is bonded on the other surface of the polarizing plate after the polarizing plate is transferred bet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCB29C55/18B32B27/08C08J5/18G02B1/04G02B5/305G02F1/133528
Inventor 竹田哲郎中田美惠村山俊介山下智弘
Owner NITTO DENKO CORP