Resin composition for retardation thin film, color filter substrate for liquid crystal display device, liquid crystal display device, and method for production of color filter substrate for liquid cry

A technology of liquid crystal display device and retardation film, which can be applied in the directions of instruments, filters, polarizing elements, etc., and can solve the problems of sufficient transparency and so on.

Inactive Publication Date: 2009-07-22
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the light absorption due to the molecular structure of the above-mentioned polyimide retardation film is strong, and the transparency cannot be said to be sufficient, and when used in the retardation film, the white display of the liquid crystal display device is yellowish, and there are images. show quality issues

Method used

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  • Resin composition for retardation thin film, color filter substrate for liquid crystal display device, liquid crystal display device, and method for production of color filter substrate for liquid cry
  • Resin composition for retardation thin film, color filter substrate for liquid crystal display device, liquid crystal display device, and method for production of color filter substrate for liquid cry
  • Resin composition for retardation thin film, color filter substrate for liquid crystal display device, liquid crystal display device, and method for production of color filter substrate for liquid cry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119]

[0120] The polyimide precursor was dissolved in N-methylpyrrolidone so that the concentration would be 0.5 g / dl, and the diluted solution was measured at 30° C. using an Ubbelohde type viscometer.

[0121]

[0122] Measurement was performed using "OPTIPRO" manufactured by Syntec Corporation.

[0123] Coat the polyimide precursor solution with a spinner on a glass substrate so that the finished thickness is 2.0 μm, then dry at 120°C for 20 minutes, and heat treat at 240°C for 30 minutes or at 270°C for 40 minutes, thereby A polyimide resin film was obtained. The refractive index anisotropy of the polyimide resin film in the direction parallel to the film surface and the refractive index anisotropy in the direction perpendicular to the film surface were measured.

[0124]

[0125] Measurement was performed using "Prizum Capra-2010" manufactured by Metrocon Corporation.

[0126] Coat the polyimide precursor solution with a spinner on a glass substrate so that the...

Synthetic example (1

[0131] Synthesis example (synthesis of 1,2,3,4-cyclobutanetetracarboxylic dianhydride)

[0132] 225 g (2.60 moles) of maleic anhydride and 1445 g of ethyl acetate were added to a reaction flask made of internally illuminated glass with an internal volume of 2 liters and equipped with a water-cooled lampshade made of Pyrex (registered trademark) glass, and the inside of the flask was replaced with nitrogen, and then Stir at room temperature to dissolve. While continuing to stir, the reaction solution was cooled to 5°C, and then began to irradiate with a 400W high-pressure mercury lamp, and continued to irradiate for 96 hours. During the irradiation, the temperature of the reaction solution was kept at 3 to 5°C. After the reaction was complete, the crystals and the filtrate were separated by filtration. The crude crystals were washed with ethyl acetate, and then dried at 40° C. for 10 hours with a vacuum dryer to obtain 194 g of crystals of 1,2,3,4-cyclobutanetetracarboxylic d...

Embodiment 1

[0134] Under a stream of dry nitrogen, 10.96 g (0.096 mol) of trans-1,4-diaminocyclohexane and 0.99 g (0.004 mol) of bis(3-aminopropyl)tetramethyldisiloxane were dissolved to 177.28 g In N-methyl-2-pyrrolidone. Then, 28.25 g (0.096 mol) of 3,3',4,4'-biphenyl tetracarboxylic dianhydride and 40.00 g of N-methyl-2-pyrrolidone were added, and it stirred at 60 degreeC for 3 hours. Further, 1.18 g (0.008 mol) of phthalic anhydride was added, followed by stirring at 60° C. for 3 hours to obtain a transparent and viscous polyamic acid solution A (polymer concentration: 16% by weight). The viscosity of solution A measured at 25° C. was 830 mPa·s. The reduced viscosity is 0.70dl / g.

[0135] Polyamic acid solution A was coated on a glass substrate with a spinner so that the finished thickness was 2.0 μm, dried at 120° C. for 20 minutes, and further heat-treated to obtain a polyimide resin film. When heat-treated at 240° C. for 30 minutes, the polyimide resin film has no refractive ind...

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Abstract

Disclosed is a resin composition for a retardation thin film, which can form a thin film having high transparency and high birefringency by applying the composition onto a substrate without the need of an alignment or stretching process. The composition comprises a polyimide precursor produced by reacting at least one tetracarboxylic acid dianhydride with at least one diamine and an organic solvent, wherein at least either one of the at least one tetracarboxylic acid dianhydride and the at least one diamine is an alicyclic compound. The composition can be used in a liquid crystal display device for forming a retardation thin film having an optically negative uniaxial anisotropy, an optical axis approximately perpendicular to a the surface of the thin film and a birefringence (delta n) in the thicknesswise direction of 0.01 to 0.3.

Description

technical field [0001] The present invention relates to a resin composition for a retardation film, a color filter substrate for a liquid crystal display device, a liquid crystal display device, and a method for producing a color filter substrate for a liquid crystal display device with a retardation film. Background technique [0002] Currently, liquid crystal display devices are used in various applications such as notebook computers, mobile information terminals, desktop monitors, and digital cameras, taking advantage of characteristics such as light weight, thin shape, and low power consumption. With the development of liquid crystal display devices for larger images and monitor applications, it is required to expand the viewing angle of liquid crystal display devices. [0003] The reason why the viewing angle of the liquid crystal display device is narrower than that of the self-luminous cathode ray tube (CRT) display device and the plasma display device is that the liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13363C08G73/10G02B5/20G02B5/30G02F1/1335
CPCG02F2413/14G02F1/133514G02B5/3083C08G73/10G02F2001/133638G02F1/133638C08L79/08G02B5/30G02F1/13363
Inventor 吉田智之山下哲夫江口益市
Owner TORAY IND INC
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