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Polarizing plate and va-type liquid crystal display device

A polarizer, curing technology, used in polarizing elements, instruments, optical elements, etc., to achieve the effect of firm bonding

Active Publication Date: 2016-03-16
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention was made in view of the above-mentioned problems and situations, and the technical problem to be solved is to provide an acrylic active energy ray-curable adhesive with a thickness of less than 1.0 μm that can be A polarizer that is firmly bonded to a retardation film and maintains strong adhesiveness even when exposed to a high-temperature, high-humidity environment for a long period of time VA type liquid crystal display device

Method used

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  • Polarizing plate and va-type liquid crystal display device
  • Polarizing plate and va-type liquid crystal display device
  • Polarizing plate and va-type liquid crystal display device

Examples

Experimental program
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Synthetic example

[0256] (Synthesis example: a synthesis example of sugar ester having a structure represented by general formula (4))

[0257] An example of synthesis of sugar esters applicable to the present invention is shown below.

[0258] [chemical formula 27]

[0259]

[0260] 34.2g (0.1 mole) of sucrose, 180.8g (0.8 mole) of benzoic anhydride, and 379.7g (4.8 mole) of pyridine were respectively charged in a four-necked flask equipped with a stirring device, a reflux condenser, a thermometer and a nitrogen inlet pipe, and stirred Next, the temperature was raised while blowing nitrogen gas from the nitrogen gas introduction tube, and esterification reaction was performed at 70° C. for 5 hours. Next, reduce the pressure in the flask to 4×10 2 Below Pa, after distilling off excess pyridine at 60°C, decompress the inside of the flask to below 1.3×10Pa, raise the temperature to 120°C, and distill off benzoic anhydride and most of the generated benzoic acid. Next, 1 L of toluene and 300 ...

Embodiment 1

[0459]

[0460]

[0461] 11 parts by mass of fine particles (Aerosil R972V manufactured by Japan Aerosil Co., Ltd.)

[0462] 89 parts by mass of ethanol

[0463] The above ingredients were stirred and mixed for 50 minutes with a dissolver, and then dispersed with a MANTONGAULIN homogenizer to prepare fine particle dispersion 1.

[0464]

[0465] The fine particle dispersion 1 prepared above was slowly added to the dissolving tank filled with dichloromethane while fully stirring. In addition, dispersion is performed using an attritor so that the particle size of the secondary particles becomes a predetermined size. This was filtered with FineMetNF manufactured by Nippon Seisen Co., Ltd. to prepare fine particle addition solution 1.

[0466] Composition of microparticle additive solution 1

[0467] Dichloromethane 99 parts by mass

[0468] Particle dispersion 15 parts by mass

[0469] A master cement of the following composition was prepared. First, add dichlorometha...

Embodiment 2

[0503]

[0504] A polyvinyl alcohol film having a thickness of 120 μm was uniaxially stretched (at a temperature of 110° C., at a stretching ratio of 5 times).

[0505] After immersing for 60 seconds in an aqueous solution consisting of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water, it was then immersed in a 68° C. aqueous solution of 3 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. This was washed with water and dried to obtain a polarizer.

[0506] (Preparation of Acrylic Curable Adhesive Composition)

[0507] The following ingredients were mixed and stirred at 50° C. for 1 hour to obtain an acrylic curable adhesive composition: 53.5% by mass of HEAA (hydroxyethylacrylamide, manufactured by Xingren Co., Ltd.) as a radical polymerizable compound, ARONIXM- 220 (tripropylene glycol diacrylate, manufactured by Toagosei Co., Ltd.) 14.6 mass %, ACMO (acryloyl morpholine, manufactured by Xingren Co., Ltd.) 29.2 mass %, KAYACUREDEX-S (diethylthio...

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Abstract

The present invention addresses the problem of providing: a polarizing plate that makes it possible to maintain the strong adhesive properties of a polarizer and a retardation film under a high-temperature and high-humidity environment even when an active energy ray-curable acrylic adhesive is used; and a VA-type liquid crystal display device that uses the polarizing plate. This polarizing plate comprises a retardation film and a protective film that are each bonded to one of the surfaces of a polarizer using an active energy ray-curable acrylic adhesive, and is characterized in that: the retardation film comprises a cellulose ester and a compound that limits the permeation ability of the abovementioned adhesive; the acyl group substitution degree of the cellulose ester is within a specific range; and the permeation depth of a test liquid used to evaluate the ability of the adhesive to permeate the retardation film when 4-hydroxydibutyl acrylate is used as the test liquid at 50DEG C for 30 seconds is within the range of 0.1-1.0 mum.

Description

technical field [0001] The present invention relates to a polarizer and a VA (Virtical Alignment) type liquid crystal display device using the polarizer, and in more detail, relates to a method for firmly bonding a polarizer with an acrylic active energy ray-curable adhesive , even in the case of long-term exposure to high-temperature and high-humidity environment, it can maintain a strong adhesive polarizer and a VA-type liquid crystal display device that does not cause color unevenness using the polarizer. Background technique [0002] A liquid crystal display device generally has a liquid crystal cell and a pair of polarizing plates sandwiching it. The polarizing plate has a polarizer and a pair of protective films sandwiching it. [0003] As the polarizer constituting the polarizing plate, since the transmittance and the degree of polarization are high, for example, an iodine-based polarizer obtained by stretching an iodine-adsorbed polyvinyl alcohol film can be widely ...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08K5/103C08L1/10G02F1/1335G02F1/13363
CPCC08K5/103C08L1/10G02B1/14G02B5/3025G02B5/3083
Inventor 赤阪和树
Owner KONICA MINOLTA INC