Polarizing plate, method for producing polarizing plate and liquid crystal display device

A technology of a liquid crystal display device and a manufacturing method, applied in polarizing elements, chemical instruments and methods, instruments, etc., capable of solving the problems of productivity (decreased yield, reduced production efficiency, poor planarity, etc., to prevent the yield from falling) , excellent yield, and improved durability and productivity

Active Publication Date: 2018-07-31
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, the method of separately providing an ultraviolet absorbing layer, and the method of making it double as a hard coat layer and imparting ultraviolet absorbing properties also cause a relatively large amount of ultraviolet absorbing agent to be contained in the layer of the film. Therefore, due to process pollution and the resulting yield reduce the production efficiency
[0008] On the other hand, according to the studies of the inventors of the present invention, as described above, when the glass plate of the liquid crystal cell used in the liquid crystal display device is thinned and the polarizer is thinned, the high-temperature / high-humidity environment Next, the polyester film containing ultraviolet absorbers used as a protective film on the visible side (observation side) has problems such as poor planarity and process contamination of the above-mentioned ultraviolet absorbers during production. The problem that the performance (yield rate) is easy to be greatly reduced

Method used

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  • Polarizing plate, method for producing polarizing plate and liquid crystal display device
  • Polarizing plate, method for producing polarizing plate and liquid crystal display device
  • Polarizing plate, method for producing polarizing plate and liquid crystal display device

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preparation example Construction

[0159] The method for preparing the composition for a hard coat layer is not particularly limited as long as the components can be uniformly mixed, and known devices such as a paint shaker, bead mill, kneader, and mixer can be used, for example.

[0160] In addition, the method for applying the composition for a hard coat layer to the first protective film of the present invention is not particularly limited, and examples thereof include spin coating, dip coating, spray coating, die coating, and bar coating. Known wet methods such as roll coating, meniscus coater, flexographic printing, screen printing, and bead coater.

[0161] [Second protective film]

[0162] The second protective film of the present invention is characterized in that it is a light-transmitting film having a light transmittance at 380 nm of less than 50%. That is, it has a characteristic of having high ultraviolet absorption performance in the ultraviolet region.

[0163] More preferably, the second prote...

Embodiment 1

[0645] "Making of the First Protective Film"

[0646] The 1st protective films PET1-PET4 which are polyester films were produced by the following method.

[0647]〔Preparation of the first protective film PET1〕

[0648] (Preparation of Polyester Resin A)

[0649] Put 86.4 parts by mass of terephthalic acid and 64.6 parts by mass of ethylene glycol into the esterification reaction container, heat up, and heat and stir at 200°C, and at the same time, put 0.017 parts by mass of antimony trioxide and 0.064 parts by mass of magnesium acetate tetrahydrate as catalysts. parts by mass, 0.16 parts by mass of triethylamine. The pressurized esterification reaction was carried out under the conditions of a gauge pressure of 0.34 MPa and a temperature of 240°C.

[0650] Next, the esterification reaction container was returned to normal pressure, and 0.014 parts by mass of phosphoric acid was added. Furthermore, it heated up to 260 degreeC in 15 minutes, and added 0.012 mass parts of tri...

Embodiment 2

[0804] "Production of the Second Protective Film: Cycloolefin Film"

[0805] [Production of the second protective film 101 ]

[0806] (Synthesis of cycloolefin resin 1)

[0807] 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.12,5.17,10]-3-dodecene (DNM) 75% by mass, dicyclopentadiene (DCP) 24% by mass, 2 - 1% by mass of norbornene, 9 parts of 1-hexene as a molecular weight modifier, and 200 parts of toluene were put into a nitrogen-substituted reaction container, and heated to 110°C. Add 0.005 parts of triethylaluminum, methanol modified WCl6 (anhydrous methanol: PhPOCl 2 : WC l6 =103:630:427 (mass ratio)) 0.005 part and reacted for 1 hour to obtain a polymer. The obtained polymer solution was put into the autoclave, and 200 parts of toluene was added thereto. Next, add the hydrogenation catalyst RuHCl(CO)[P(C 6 h 5 )] 3 0.006 parts, after heating to 90° C., put hydrogen gas into the reactor, and set the pressure to 10 MPa. Then, the pressure was kept at 10 MPa, and the ...

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Abstract

The objective of the present invention is to provide: a polarizing plate which has improved durability and production efficiency; a method for producing this polarizing plate; and a liquid crystal display device which is provided with this polarizing plate. A polarizing plate according to the present invention is configured of a first protective film, a polarizer and a second protective film, which are sequentially arranged in this order from the viewing side. This polarizing plate is characterized by being a light-transmitting film wherein: the first protective film is composed of a polyesterfilm that has in-plane super birefringence and a light transmittance at 380 nm of 50% or more; and the second protective film has a light transmittance at 380 nm of less than 50%.

Description

technical field [0001] The present invention relates to a polarizing plate, a method for producing the polarizing plate, and a liquid crystal display device. Specifically, the present invention relates to a polarizing plate having improved durability and production efficiency, a method for producing the same, and a liquid crystal display device including the polarizing plate. Background technique [0002] In display devices such as liquid crystal display devices (hereinafter also referred to as LCDs) and organic electroluminescence display devices (hereinafter also referred to as OLEDs), thinning of the devices has progressed in recent years. Along with this, there is an increasing demand for thinner polarizers of the above-mentioned display devices. [0003] A polarizing plate is generally equipped with a protective film for protecting the polarizer, the polarizing plate itself, and a polarizing plate using a polyester film is known as a protective film on the visible (obse...

Claims

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Application Information

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IPC IPC(8): G02B5/30B32B7/02B32B27/32B32B27/36G02F1/1335
CPCB32B27/32B32B27/36G02F1/1335G02B5/30G02B5/305B32B23/04B32B27/06B32B27/325C08K5/10C08K5/3475C08K5/3492C08L1/02G02B5/208G02B5/3033B32B7/023B32B2307/42
Inventor 村上隆田中博文榑松雅行
Owner KONICA MINOLTA INC
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