Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element

Abstract

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display device. The liquid crystal alignment agent can produce the liquid crystal display element with features of high speed response and excellent voltage holding rate, afterimage characteristic, light resistance and excellent uniform coating property. The liquid crystal aligning agent, comprises (A) at least one polymer selected from a group consisting of polyamic acid, polyimide, (methyl ) acrylic acid polymer, polysiloxane and poly(amic ester); and the polymer has groups shown by the following formula (1), wherein the group R3 is preferably the group shown by the following formula (2).

Description

technical field

[0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film, and a liquid crystal display element. Background technique

[0002] In recent years, liquid crystal display elements have been applied to a wide range of applications from small liquid crystal display devices such as mobile phones to large-screen liquid crystal display devices such as liquid crystal televisions due to their advantages of low power consumption, easy miniaturization, and flattening.

[0003] According to the change of the orientation (arrangement) state of the liquid crystal molecules, the drive mode of the liquid crystal display device is known as TN (twisted nematic), STN (super nematic twist), IPS (in-plane switching), VA (vertical alignment), etc. . In addition, in the VA mode, in order to improve the viewing angle by splitting the orientation, there are MVA (multi-domain vertical alignment) method and PVA (image vertical alignment) met...

Examples

preparation example Construction

[0140]

[0141] As mentioned above, although this liquid crystal aligning agent contains [A] polymer as an essential component, and can contain other optional components as needed, it is preferable to prepare as the composition of the solution form which each component melt|dissolved in the organic solvent.

[0142] As the organic solvent that can be used to prepare the liquid crystal aligning agent, an organic solvent that dissolves the [A] polymer and other optional components and does not react with them is preferred. As an organic solvent, the organic solvent etc. which were illustrated above as being used for synthesis|combination of the said polyamic acid are mentioned, for example. Moreover, the poor solvent illustrated as a poor solvent used for the synthesis|combination of a polyamic acid can also be used together. Moreover, these organic solvents may be used individually or in combination of 2 or more types.

[0143] The preferred solvent that can be used to prepa...

Embodiment

[0157] Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[0158] The weight average molecular weight (Mw) of [A] polymer obtained in the following Example is a polystyrene conversion value measured by the GPC of the following standard.

[0159] Column: Tosoh Corporation, TSKgelGRCXLII

[0160] Solvent: THF

[0161] Temperature: 40°C

[0162] Pressure: 68kgf / cm 2

Synthetic example 1

[0164] Compounds 1, 2 and 3 were synthesized according to the following reaction scheme.

[0165]

[0166] Add 12.6 g (0.0645 mol) of 4-cyano-4'-hydroxybiphenyl, 17.0 g (0.0717 mol) of 10-bromo-1-decanol, 28.4 g of potassium carbonate and 350 mL of N,N-dimethylformamide was heated and stirred at 160° C. for 5 hours. After confirming the completion of the reaction by TLC, the reaction solution was cooled to room temperature. The reaction solution was poured into 1000 mL of water, and mixed and stirred. The precipitated white solid was separated by filtration and further washed with water. The obtained solid was vacuum-dried at 80° C. to obtain 20.6 g of the above-mentioned compound 1 . Next, 20 g (0.0569 mol) of the obtained compound 1 was dissolved in 150 mL of dehydrated tetrahydrofuran (THF), 7.49 g (0.0740 mol) of triethylamine was added, and then slowly added by dissolving in 150 mL of THF under ice-cooling for 30 minutes. 14.4 g (0.0625 mol) of the obtained 3,5-din...

technical field

[0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film, and a liquid crystal display element. Background technique

[0002] In recent years, liquid crystal display elements have been applied to a wide range of applications from small liquid crystal display devices such as mobile phones to large-screen liquid crystal display devices such as liquid crystal televisions due to their advantages of low power consumption, easy miniaturization, and flattening.

[0003] According to the change of the orientation (arrangement) state of the liquid crystal molecules, the drive mode of the liquid crystal display device is known as TN (twisted nematic), STN (super nematic twist), IPS (in-plane switching), VA (vertical alignment), etc. . In addition, in the VA mode, in order to improve the viewing angle by splitting the orientation, there are MVA (multi-domain vertical alignment) method and PVA (image vertical alignment) met...

Examples

preparation example Construction

[0140]

[0141] As mentioned above, although this liquid crystal aligning agent contains [A] polymer as an essential component, and can contain other optional components as needed, it is preferable to prepare as the composition of the solution form which each component melt|dissolved in the organic solvent.

[0142] As the organic solvent that can be used to prepare the liquid crystal aligning agent, an organic solvent that dissolves the [A] polymer and other optional components and does not react with them is preferred. As an organic solvent, the organic solvent etc. which were illustrated above as being used for synthesis|combination of the said polyamic acid are mentioned, for example. Moreover, the poor solvent illustrated as a poor solvent used for the synthesis|combination of a polyamic acid can also be used together. Moreover, these organic solvents may be used individually or in combination of 2 or more types.

[0143] The preferred solvent that can be used to prepa...

Embodiment

[0157] Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[0158] The weight average molecular weight (Mw) of [A] polymer obtained in the following Example is a polystyrene conversion value measured by the GPC of the following standard.

[0159] Column: Tosoh Corporation, TSKgelGRCXLII

[0160] Solvent: THF

[0161] Temperature: 40°C

[0162] Pressure: 68kgf / cm 2

Synthetic example 1

[0164] Compounds 1, 2 and 3 were synthesized according to the following reaction scheme.

[0165]

[0166] Add 12.6 g (0.0645 mol) of 4-cyano-4'-hydroxybiphenyl, 17.0 g (0.0717 mol) of 10-bromo-1-decanol, 28.4 g of potassium carbonate and 350 mL of N,N-dimethylformamide was heated and stirred at 160° C. for 5 hours. After confirming the completion of the reaction by TLC, the reaction solution was cooled to room temperature. The reaction solution was poured into 1000 mL of water, and mixed and stirred. The precipitated white solid was separated by filtration and further washed with water. The obtained solid was vacuum-dried at 80° C. to obtain 20.6 g of the above-mentioned compound 1 . Next, 20 g (0.0569 mol) of the obtained compound 1 was dissolved in 150 mL of dehydrated tetrahydrofuran (THF), 7.49 g (0.0740 mol) of triethylamine was added, and then slowly added by dissolving in 150 mL of THF under ice-cooling for 30 minutes. 14.4 g (0.0625 mol) of the obtained 3,5-din...

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