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Retardation film, polarizing plate using same, and display device

A technology of retardation film and retardation enhancer, applied in polarizing elements, applications, household appliances, etc., can solve the problems of uneven color and variation of liquid crystal display devices

Active Publication Date: 2016-11-09
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the moisture permeability of the retardation film is high, the retardation value (retardation value) of the retardation film tends to fluctuate by allowing moisture to permeate inside, and as a result, there is a problem of color unevenness in the liquid crystal display device.

Method used

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  • Retardation film, polarizing plate using same, and display device
  • Retardation film, polarizing plate using same, and display device
  • Retardation film, polarizing plate using same, and display device

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0207] (Synthesis example: Synthesis example of sugar ester compound)

[0208] [chemical formula 22]

[0209]

[0210] 34.2g (0.1 mol) of sucrose, 135.6g (0.6 mol) of benzoic anhydride, and 284.8g (3.6 mol) of pyridine are charged in a four-necked flask with a stirring device, a reflux cooler, a thermometer and a nitrogen inlet pipe, while stirring While boiling nitrogen gas from a nitrogen gas introduction tube, the temperature was raised, and esterification reaction was performed at 70° C. for 5 hours.

[0211] Next, reduce the pressure in the flask to 4×10 2 Pa or below, after distilling off excess pyridine at 60° C., the inside of the flask was depressurized to 1.3×10 Pa or below, the temperature was raised to 120° C., and most of benzoic anhydride and generated benzoic acid were distilled off. Then, 1 L of toluene and 300 g of a 0.5 mass % sodium carbonate aqueous solution were added, and after stirring at 50° C. for 30 minutes, the mixture was left still, and the to...

Embodiment

[0504] Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these. In addition, in an Example, the expression of "part" or "%" is used, and unless otherwise specified, it means "part by mass" or "% by mass".

[0505] "Retardation film production"

[0506] [Production of Retardation Film 101]

[0507]

[0508] A retardation enhancer obtained by mixing Compound 38 (nitrogen-containing compound (A)) and Compound 150 (nitrogen-containing compound (B)) at a mass ratio of 99.9:0.1 was used.

[0509]

[0510] While heating, the following components were sufficiently stirred and dissolved to prepare a main dope liquid.

[0511] Cellulosic resin C1 (diacetyl cellulose having an acetyl substitution degree of 2.41 and a weight average molecular weight (Mw) of 56,000): 100 parts by mass

[0512] Phase difference enhancer (nitrogen-containing compound (A)+nitrogen-containing compound (B)): 3 parts by mass

[0513]...

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Abstract

[Problem] To provide: a retardation film which is capable of suppressing retardation change in a wet heat environment, while maintaining high retardation developability; a polarizing plate using the retardation film; and a display device. [Solution] A retardation film comprising a retardation increasing agent that contains a nitrogen-containing compound (A) represented by general formula (1) and a nitrogen-containing compound (B) represented by general formula (2). (In general formula (1), each Ar independently represents a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubstituted nitrogen-containing aromatic heterocycle; and each of X2 and Y2 independently represents a substituted or unsubstituted nitrogen-containing aromatic heterocycle.) (In general formula (2), each Ar independently represents a substituted or unsubstituted aromatic hydrocarbon ring or a substituted or unsubstituted nitrogen-containing aromatic heterocycle; and each of X3, Y3 and Z3 independently represents a substituted or unsubstituted nitrogen-containing aromatic heterocycle.)

Description

technical field [0001] The invention relates to a retardation film, a polarizer and a display device. In more detail, it is related with the retardation film which suppressed the retardation fluctuation|variation in the heat-and-moisture environment, and the polarizing plate which provided this retardation film, and was excellent in heat-and-moisture resistance, and a display device. Background technique [0002] Liquid crystal display devices are in increasing demand for applications such as liquid crystal televisions and liquid crystal displays for notebook computers. Generally, a liquid crystal display device is composed of a liquid crystal cell formed by sandwiching a transparent electrode, a liquid crystal layer, a color filter, etc. with a glass plate, and two polarizing plates arranged on both sides thereof. A structure in which a polarizer (hereinafter, also referred to as a polarizing film) is sandwiched between a protective film (hereinafter, also referred to as a...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08K5/34C08L1/00G02F1/1335G02F1/13363
CPCB29D11/00644B29D11/00788C08K5/34C08L1/10G02B5/3033G02B5/3083G02F2201/50G02F1/133635C08L1/12C08J5/18G02F1/13363
Inventor 森井里志世良贵史高木隆裕
Owner KONICA MINOLTA INC
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