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Cellulose acetate film, polarizing plate, and liquid-crystal display device

A technology of cellulose acetate and cellulose acetate, applied in the field of liquid crystal display devices, can solve the problems of image wavy spots, visual recognition deterioration, etc., achieve excellent visual recognition and viewing angle characteristics, and achieve the effect of thin film

Active Publication Date: 2012-05-23
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the obtained polarizing plate was assembled to produce a liquid crystal display device, the occurrence of stripe-like spots was confirmed in the image at the time of black display (black display), although it was rare
In addition, when stored in a hot and humid environment for a long time, wavy spots appear in the image and the visibility deteriorates.

Method used

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  • Cellulose acetate film, polarizing plate, and liquid-crystal display device
  • Cellulose acetate film, polarizing plate, and liquid-crystal display device
  • Cellulose acetate film, polarizing plate, and liquid-crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0078] (Synthesis example: Synthesis of the compound of the present invention)

[0079] [chemical formula 4]

[0080]

[0081] Add 34.2 g (0.1 mol) of sucrose, 180.8 g (0.8 mol) of benzoic anhydride, and 379.7 g (4.8 mol) of pyridine into a four-necked flask equipped with a stirring device, a reflux condenser, a thermometer, and a nitrogen gas introduction tube, while stirring While bubbling nitrogen gas from a nitrogen gas introduction tube, the temperature was raised, and esterification reaction was performed at 70° C. for 5 hours. Next, reduce the pressure in the flask to 4×10 2 Pa below, distill off excess pyridine at 60°C, then reduce the pressure in the flask to below 1.3×10Pa, and raise the temperature to 120°C to distill off benzoic anhydride and most of the generated benzoic acid. Then, 1 L of toluene and 300 g of a 0.5% by mass sodium carbonate aqueous solution were added, and the mixture was stirred at 50° C. for 30 minutes, then left still, and the toluene lay...

Embodiment 1

[0307]

[0308]

[0309] Particles (AEROSIL R972V Nippon Aerosil Co., Ltd.) 11 parts by mass

[0310] 89 parts by mass of ethanol

[0311] After stirring and mixing the above-mentioned components for 50 minutes in a dissolver, dispersion was carried out in a Manton-Gaulin (Monton colloid mill).

[0312]

[0313] While fully stirring, the fine particle dispersion 1 was slowly added to the dissolution tank filled with methylene chloride. Then, dispersion is carried out by an attritor so that the particle size of the secondary particles becomes a specified size. This dispersion liquid was filtered using Finemet NF manufactured by Nippon Seisen Co., Ltd., to prepare a fine particle addition liquid 1.

[0314] Dichloromethane 99 parts by mass

[0315] Particle dispersion 15 parts by mass

[0316] The main glue liquid of the following composition was prepared. First, add dichloromethane and ethanol to a pressurized dissolution tank. While stirring, the cellulose acetate ...

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PUM

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Abstract

Disclosed are a cellulose acetate film characterized by comprising cellulose acetate that has a degree of acetylation of 51.0-56.0% and a compound that is represented by general formula (1) and has a total average degree of substitution of 6.1-6.9, a polarizing plate capable of maintaining excellent visibility, and a liquid-crystal display device having excellent visibility and viewing angle characteristics. In general formula (1), R1 to R8 may be the same or different and each represents an (un)substituted alkylcarbonyl or an (un)substituted arylcarbonyl.

Description

technical field [0001] The present invention relates to a polarizing plate and a liquid crystal display device. Specifically, when a cellulose acetate film capable of maintaining planarity and having excellent retardation expression is used as a polarizing plate protective film and a retardation film serving as a polarizing plate protective film, the A polarizing plate that is thinned and exhibits excellent visibility and viewing angle characteristics when used in a liquid crystal display device, and a liquid crystal display device using the polarizing plate. Background technique [0002] In recent years, liquid crystal display devices have been used not only in monitors for personal computers but also in TVs, and their size and brightness have been increased. At the same time, the demand for thinner devices has also increased. As a result, high durability is inevitably required, and the demand for thinner thickness of each member used in a liquid crystal display device is f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08J5/18C08K5/103G02B5/30G02F1/1335
CPCC08J5/18G02B1/04C08J2301/12C08K5/151G02B5/3033C08L1/12C09K2323/00C09K2323/057Y10T428/28Y10T428/31786G02B5/30G02F1/1335
Inventor 金子由纪
Owner KONICA MINOLTA OPTO
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