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Retardation film for va, method for producing retardation film for va, polarizing plate, and vertical alignment type liquid crystal display device

A technology of retardation film and manufacturing method, applied in polarizing elements, instruments, optical elements, etc., can solve problems such as color tone change, and achieve the effect of improving the durability of damp heat

Active Publication Date: 2019-10-11
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of using a cellulose ester retardation film, fluctuations in retardation under high-humidity environments and consequent changes in the color tone of images displayed on liquid crystal display devices become a problem

Method used

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  • Retardation film for va, method for producing retardation film for va, polarizing plate, and vertical alignment type liquid crystal display device
  • Retardation film for va, method for producing retardation film for va, polarizing plate, and vertical alignment type liquid crystal display device
  • Retardation film for va, method for producing retardation film for va, polarizing plate, and vertical alignment type liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0239]

[0240] Hereinafter, synthesis examples of sugar esters are shown.

[0241] [chemical formula 15]

[0242]

[0243] 34.2g (0.1 moles) of sucrose, 180.8g (0.8 moles) of benzoic anhydride, and 379.7g (4.8 moles) of pyridine were respectively charged into a four-necked flask equipped with a stirring device, a reflux cooler, a thermometer and a nitrogen inlet pipe, and While bubbling nitrogen gas from a nitrogen gas introduction tube with stirring, esterification reaction was performed at 70 degreeC for 5 hours, raising temperature. Next, reduce the pressure in the flask to 4×10 2 After distilling off excess pyridine at 60° C. below Pa, the pressure in the flask was reduced to below 1.3×10 Pa, and the temperature was raised to 120° C. to distill off most of benzoic anhydride and generated benzoic acid. Then, 1 L of toluene and 300 g of a 0.5% by mass sodium carbonate aqueous solution were added, and after stirring at 50° C. for 30 minutes, the mixture was left still...

Embodiment

[0413] Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples. In addition, in an Example, the expression of "part" or "%" is used, and unless otherwise specified, it means "part by mass" or "% by mass".

[0414]

[0415]

[0416] Particles (manufactured by AEROSIL R812 Japan Aerosil Co., Ltd.) 11 parts by mass

[0417] 89 parts by mass of ethanol

[0418] The above substances were stirred and mixed with a dissolving bar for 50 minutes, and then dispersed with Manton-Gaulin to prepare fine particle dispersion 1.

[0419]

[0420] The microparticle dispersion 1 was slowly added to the dissolving tank containing dichloromethane while fully stirring. Further, disperse with an Attritor to make the particle size of the secondary particle a specified size. This was filtered through Fine Met NF manufactured by Nippon Seisen Co., Ltd., to prepare fine particle addition liquid 1.

[0421] Dichlor...

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PUM

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Abstract

The retardation film for VA contains a cellulose ester resin, and satisfies the following conditions (1) and (2) at the same time. Condition (1): Smd+Std≤0.65%, where Smd and Std respectively represent the length direction and Dimensional change rate (%) in film width direction. Condition (2): Rth2‑Rth1≤9nm, where Rth1 refers to the retardation (nm) measured in the thickness direction when the film is sandwiched between two transparent substrates without using an adhesive, and Rth2 refers to the retardation (nm) measured with two transparent substrates. Retardation (nm) in the thickness direction measured when the substrate sandwiches the film and an adhesive is present between the film and a transparent substrate.

Description

technical field [0001] The present invention relates to a retardation film for VA applicable to a vertical alignment type (VA type; Vertical Alignment) liquid crystal display device, a manufacturing method of the retardation film for VA, a polarizing plate using the retardation film for VA, And a vertical alignment type liquid crystal display device using the polarizer. Background technique [0002] As an optical compensation film used in a VA-type liquid crystal display device, a retardation film for VA containing a cellulose ester resin is known (hereinafter, the above-mentioned film is also described as a cellulose ester retardation film, or simply referred to as a film ). In the case of using a cellulose ester-based retardation film, fluctuations in the retardation in a high-humidity environment and a change in color tone of an image displayed on a liquid crystal display device along with it become a problem. As one of the main causes of the change in color tone, the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B5/3083G02F1/133528C08J5/18C08L1/12G02B5/3033
Inventor 金子由纪
Owner KONICA MINOLTA INC
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