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Polarizing plate and method for manufacturing the same

A manufacturing method and a technology for polarizing plates, which can be applied to polarizing elements, installation, optics, etc., can solve the problems of easy red change and the contrast reduction of liquid crystal display devices, etc., and achieve the effect of excellent durability

Active Publication Date: 2015-05-20
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present inventors have carried out in-depth research and found that if the above-mentioned existing polarizing plate is exposed to a high temperature environment, it is easy to turn red, and this red turn causes the contrast of the liquid crystal display device to decrease, thereby completing the present invention.

Method used

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  • Polarizing plate and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0047] figure 1 It is a flowchart which shows 1st Embodiment of the manufacturing method of the polarizing plate concerning this invention. Accordingly, the method of manufacturing a polarizing plate is a method of sequentially performing the steps of forming a resin layer formed of a polyvinyl alcohol-based resin on one surface of a base film to form a laminated film (S10). A stretching process (S20) in which the above-mentioned laminated film is uniaxially stretched at a stretching ratio exceeding 5 times to form a stretched film (S20); the above-mentioned resin layer is dyed with a dichroic dye to form a polarizer layer, thereby A dyeing process (S30) to obtain a dyed film; a cross-linking process (S40) to obtain a cross-linked film by immersing the above-mentioned polarizer layer of the above-mentioned dyed film in a solution containing a cross-linking agent; a drying process (S40) to dry the above-mentioned cross-linked film ( S50).

[0048] The polarizing plate obtaine...

no. 2 Embodiment approach

[0051] figure 2 It is a flowchart which shows 2nd Embodiment of the manufacturing method of the polarizing plate which concerns on this invention. According to this, the manufacturing method of the polarizing plate sequentially implements the resin layer forming step (S10) of forming a resin layer formed of a polyvinyl alcohol-based resin on one surface of the base film to form a laminated film; Stretching step (S20) of performing uniaxial stretching treatment on the above-mentioned laminated film to form a stretched film; dyeing the above-mentioned resin layer with a dichroic dye to form a polarizer layer, thereby obtaining a dyeing process of a dyed film ( S30); dipping the above-mentioned polarizer layer of the above-mentioned dyed film in a solution containing a cross-linking agent to obtain a cross-linked film (S40); drying the above-mentioned cross-linked film to obtain a drying process of a polarizing laminated film (S50) ; Then sequentially include a bonding process ...

Embodiment 1

[0133] The polarizing plate according to the present invention was produced.

[0134] (substrate film)

[0135] As the base film, an unstretched homopolypropylene (PP) film having a thickness of 100 μm was used.

[0136] (formation of undercoat layer)

[0137] Polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER Z-200) was dissolved in hot water at 95° C. to obtain a polyvinyl alcohol aqueous solution having a concentration of 3% by weight. In the obtained aqueous polyvinyl alcohol solution, 5 parts by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: SUMIREZ (registered trademark) RESIN 650) was mixed with 6 parts by weight of polyvinyl alcohol powder. The obtained mixed aqueous solution was applied to the corona-treated surface of the substrate film, and dried at 80° C. for 10 minutes to form a 0.2 μm thick undercoat layer.

[0138] (Resin layer formation process)

[0139] Po...

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Abstract

Disclosed is durable polarizing plate which has a polarizing element layer which can provide a display having a good contrast ratio in a liquid crystal display device. Also provided is a method for manufacturing the polarizing plate which includes the following steps: a first step in which a polarizing plate is left to stand for 750 hours in an environment at 85°C, and a second step in which the polarizing plate is left to stand for 48 hours in an environment at room temperature immediately after the first step. The polarizing plate which is produced has ?X and ?Y which satisfy ?Y / ?X = 0.7, when an evaluation test is carried out in which the orthogonal a value of the Hunter-Lab color system immediately before the first step starts, immediately after the first step ends, and immediately after the second step ends, is taken as a1, a2, and a3, respectively, where the difference between a2 and a1 is ?X and the difference between a2 and a3 is ?Y; and these values are acquired in relation to the polarizing element layer. Also provided is a liquid crystal display device which employs the polarizing plate.

Description

technical field [0001] The present invention relates to a polarizing plate and a manufacturing method thereof. Background technique [0002] Liquid crystal display devices have the characteristics of low power consumption, low-voltage operation, light weight and thin profile, and are used in various display devices. The liquid crystal display device is composed of various materials such as a liquid crystal cell, a polarizing plate, a retardation film, a light concentrating film, a diffusion film, a light guide plate, and a reflective film. Therefore, improvements aiming at productivity, weight reduction, improvement of brightness, etc. have been actively made by reducing the number of sheets constituting the film or by reducing the thickness of the film or sheet. [0003] On the other hand, liquid crystal display devices are required to withstand severe durability conditions depending on the application. For example, a liquid crystal display device for a car navigation sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3033G02F1/133528G02B7/36
Inventor 河村真一
Owner SUMITOMO CHEM CO LTD