Polarizing plate manufacturing method

A manufacturing method and polarizer technology, which is applied in the field of polarizer manufacturing, can solve problems such as floating, failure to exert adhesiveness, and peeling film, and achieve the effects of improved production capacity, good appearance, and high productivity

Inactive Publication Date: 2012-05-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the cycloolefin-based resin film is corona-treated and bonded to the polarizing film, sufficient adhesiveness cannot be exerted immediately after bonding, and as a result, rings may appear in the subsequent manufacturing process. Delamination of olefin-based resin film and polarizing film or film floating

Method used

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  • Polarizing plate manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116]

[0117]A polyvinyl alcohol film having a thickness of 80 μm was immersed in a water bath at 30° C. to swell. Next, this polyvinyl alcohol was dipped in a 5% by weight (weight ratio: iodine / potassium iodide=1 / 10) iodine solution (liquid temperature: 30° C.) for 0.5 minutes to be dyed. Then immerse in the aqueous solution (liquid temperature is 30 ℃) that comprises the boric acid of 3 weight % and the potassium iodide of 2 weight % after 0.5 minute, then in the aqueous solution (liquid temperature is 60 ℃) that comprises the boric acid of 4 weight % and the potassium iodide of 3 weight % °C) for 1 minute, stretched to 6 times the initial length in the state after immersion. Then, it was immersed in 5 weight% potassium iodide aqueous solution (liquid temperature: 30 degreeC) for 0.5 minute. Then, it was dried in an oven at 40° C. for 1 minute to obtain a polarizing film with a thickness of 30 μm. The moisture content of the polarizing film was 14% by weight.

[0118]...

Embodiment 2

[0133] In this example, in addition to performing corona discharge treatment as an easy-adhesion treatment to the norbornene-based resin film, and immersing it once in a water bath (aqueous solution containing 0.1% by weight of ethanol) for 30 seconds, using the same The same method as in Example 1 was used to manufacture the polarizing plate of this example. In addition, the conditions of the corona discharge treatment were 2.0 kW of corona output intensity|strength, and 18 m / min of linear velocity.

Embodiment 3

[0135] In this example, except that the conditions of the corona discharge treatment on the norbornene-based resin film were changed to a corona output intensity of 0.6 kW and a line speed of 13 m / min, and the water temperature during the dipping treatment was changed to 60°C Except that, the polarizing plate of this example was produced similarly to Example 2.

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Abstract

Provided are: a polarizing plate manufacturing method which makes it possible to increase the throughput by preventing adhesion failure between a polarizing film and a transparent protective film even immediately after the transparent protective film is laminated on and adhered to the polarizing film; and a polarizing plate obtained by the method. On the transparent protective film, at least a surface thereof to be attached to the polarizing film is subjected to adhesion improving treatment. Then, water and at least the surface having been subjected to the adhesion improving treatment are brought into contact with each other. Then, the transparent protective film is laminated on the polarizing film in such a manner that a surface on one side of the transparent protective film is attached to the polarizing film, the one side having the surface that has been brought into contact with water and has been subjected to the adhesion improving treatment.

Description

technical field [0001] This invention relates to the manufacturing method of the polarizing plate provided with the transparent protective film on at least one surface of a polarizing film, and the polarizing plate obtained by this method. Furthermore, the present invention relates to an optical film including the polarizer, and an image display device including the polarizer or the optical film. Background technique [0002] As polarizers used in image display devices such as liquid crystal display devices, electroluminescent (EL) display devices, plasma displays (PD) or field emission displays (FED: Field Emission Display), generally on both sides of the polarizing film Attached with a protective film. [0003] Examples of the polarizing film include those in which a polyvinyl alcohol-based film is adsorbed with a dichroic material such as iodine or a dichroic dye, and then stretched and oriented. In addition, examples of the protective film include stretched polycarbona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3033G02B1/105G02B1/14G02B5/30G02F1/1335
Inventor 村上亚衣齐藤武士池田哲朗佐竹正之
Owner NITTO DENKO CORP
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