Liquid crystal tropism agent and liquid crystal display element

A technology of liquid crystal display element and liquid crystal aligning agent, which is applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of pretilt angle deviation and display quality degradation, and achieve high pretilt angle, good orientation uniformity, and printing Excellent effect

Inactive Publication Date: 2007-12-26
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although these alignment film materials that can be used in TN type, STN type, and OCB type liquid crystal display elements exist in the past, and can exhibit high pretilt angles, most of them have deviations in the display screen, resulting in a decrease in display quality.

Method used

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  • Liquid crystal tropism agent and liquid crystal display element
  • Liquid crystal tropism agent and liquid crystal display element
  • Liquid crystal tropism agent and liquid crystal display element

Examples

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Embodiment

[0116] Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples. In the examples and comparative examples, the pretilt angle, uniformity of the pretilt angle, voltage retention rate, and printing were evaluated by the following methods.

[0117]

[0118] According to the method described in T.J.Scheffer et al., J.Appl.Phys., Vol.19, 2013 (1980), it measured by the crystal rotation method using a He-Ne laser. At this time, in the same process, six liquid crystal display elements manufactured using an alignment agent were measured, and the average value was obtained from the following formula, and used as the pretilt angle of the liquid crystal display element.

[0119] The pretilt angle of the liquid crystal display element = (the measured value of the pretilt angle of the first liquid crystal display element + the measured value of the pretilt angle of the second liquid crystal display element + the measured ...

Synthetic example 1

[0133]112.09 g (0.5 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 1,3,3a,4,5,9b-hexahydro-8-methyl-5 -(tetrahydro-2,5-dioxo-3-furyl)-naphthalene[1,2-c]-furan-1,3-dione 157.14g (0.5 moles), as the p- 55.42 g (0.5125 mol) of phenylenediamine, 128.09 g (0.4 mol) of 2,2'-trifluoromethyl-4,4'-diaminobiphenyl, and 35.07 g (0.08 mol) of the compound represented by the above formula (22) 1.4 g (0.015 mol) of aniline as a monoamine was dissolved in 1140 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours to obtain a polyamide with a shear viscosity of 9.7 mPa·s at 5.0% by weight. Amic acid. Add 3256g of N-methyl-2-pyrrolidone, 316.4g of pyridine and 408.4g of acetic anhydride to the obtained polyamic acid, dehydrate and close the ring at 110°C for 4 hours, concentrate under reduced pressure with an evaporator, and distill off the catalyst and solvent. Dilute with gamma-butyrolactone to obtain 4800 g of 5.0% by weight under the she...

Synthetic example 2

[0135] 112.09 g (0.5 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 1,3,3a,4,5,9b-hexahydro-8-methyl-5 -(tetrahydro-2,5-dioxo-3-furyl)-naphthalene[1,2-c]-furan-1,3-dione 157.14g (0.5 moles), as the p- 55.42 g (0.5 125 mol) of phenylenediamine, 133.7 g (0.4 mol) of 2,2-bis(4-aminophenyl) hexafluoropropane, and 41.83 g (0.08 mol) of the compound represented by the above formula (16), as a single 1.4 g (0.015 mol) of aniline as an amine was dissolved in 1170 g of N-methyl-2-pyrrolidone and reacted at 60° C. for 6 hours to obtain a polyamic acid having a shear viscosity of 10.2 mPa·s at 5.0% by weight. Add 3340g of N-methyl-2-pyrrolidone, 316.4g of pyridine and 408.4g of acetic anhydride to the obtained polyamic acid, dehydrate and close the ring at 110°C for 4 hours, concentrate under reduced pressure with an evaporator, distill off the catalyst and solvent, and use Gamma-butyrolactone was released to obtain 5000 g of polyimide with a sh...

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Abstract

The invention provides a liquid crystal aligning agent of a liquid crystal aligning film with a high pretilt angel, a good aligning uniformity and a good printing characteristic. A liquid crystal aligning agent comprises an unit including polyamide repeated units and a polymer of imidization repeated units described in the formula (I-2). The ratio of the polyamide repeated units is 60-90% and the imidization repeated units contain 5-100 mol% of specific repeated units such as formula (A), relative to the total quantity of the polyamide repeated units and the imidization repeated units.

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used for forming the liquid crystal aligning film of a liquid crystal display element, and the liquid crystal display element which has this liquid crystal aligning film. More specifically, it relates to the ability to exhibit high pretilt angle and orientation uniformity in a wide temperature range, that is, the uniformity of the pretilt angle is good, the printing characteristics are excellent, and it can be used to form TN-type liquid crystal display elements, STN-type liquid crystal display elements, OCB A liquid crystal aligning agent for a liquid crystal aligning film of a liquid crystal display element and a liquid crystal display element having the liquid crystal aligning film. Background technique [0002] At present, as a liquid crystal display element, a TN type liquid crystal display element having a so-called TN type (Twisted Nematic) liquid crystal cell is known, which forms a li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC08G73/10C08L79/08C09K19/56G02F1/133723
Inventor 安田博幸林英治西川通则
Owner JSR CORPORATIOON
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