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

A liquid crystal aligning agent and solvent technology, used in liquid crystal materials, optics, instruments, etc., can solve the problems of uneven film thickness, easy generation of pinholes, and poor afterimage characteristics.

Active Publication Date: 2014-09-17
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the printing of the liquid crystal aligning agent is performed at room temperature, the film thickness unevenness due to the decrease in viscosity is becoming a problem
In addition, when the alignment agent is applied, the phenomenon that the alignment agent itself or the alignment film is whitened due to the occurrence of depressions and pinholes, or the phenomenon that the alignment agent absorbs moisture is also a problem.
Furthermore, it is known that the film thickness unevenness, pinholes, and whitening phenomena of the liquid crystal alignment film are related to the poor orientation and afterimage characteristics of the liquid crystal panel (see Patent Document 2 and Patent Document 3, etc.)

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0468] Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. Evaluation methods in Examples are as follows.

[0469]

[0470] The weight average molecular weight of a polyamic acid is calculated|required by the GPC method using 2695 separation module · 2414 differential refractometers (made by Waters), and performing polystyrene conversion. The obtained polyamic acid was diluted with a phosphoric acid-dimethylformamide (DMF) mixed solution (phosphoric acid / DMF=0.6 / 100: weight ratio) so that the polyamic acid concentration became about 2 wt%. HSPgel RT MB-M (manufactured by Waters) was used as a column, and the mixed solution was used as a developing solvent, and the measurement was performed under the conditions of a column temperature of 50° C. and a flow rate of 0.40 mL / min. As the standard polystyrene, TSK standard polystyrene manufactured by Tosoh Co., Ltd. was used.

[0471]

[0472] The viscosity of polyamic ...

Synthetic example 1

[0510] Add 1.4291 g of diamine (DI-5-1, m=2) and 18.5 g of dehydrated DMIB to a 50 mL brown four-necked flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen gas inlet, and carry out under a dry nitrogen stream. Stir to dissolve. Then, 0.6899 g of acid dianhydride (AN-1-13), 0.8810 g of acid dianhydride (AN-3-2), and 18.5 g of dehydrated DMIB were added, and stirring was continued at room temperature for 24 hours. BC10.0g was added to this reaction solution, and the polyamic-acid solution whose polymer solid content concentration was 6 wt% was obtained. Let this polyamic-acid solution be PA1. The weight average molecular weight of the polyamic acid contained in PA1 was 84,000.

[0511] [Synthesis Example 2 to Synthesis Example 22]

[0512] Except for changing the solvent composition, tetracarboxylic dianhydride and diamine as shown in Table 1, polyamic acid solutions (PA2) to polyamic acid solutions (PA22) with a polymer solid content conce...

Embodiment 1

[0524] The viscosity immediately after the synthesis of the polyamic acid solution (PA1) having a polymer solid content concentration of 6 wt% prepared in Synthesis Example 1 was measured to be 39.3 Pa·s (initial viscosity). In addition, the viscosity of this varnish after storage at room temperature for 30 days was measured and found to be 38.0 Pa·s. By this method, the printability (recess property) was confirmed visually, and as a result, the dent of the alignment agent was not seen.

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Abstract

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display element. The liquid crystal aligning agent is a solution containing polyamide acid or derivatives thereof obtained by reacting tetracarboxylic dianhydride with diamine and a solvent, and the solvent contains at least one of compounds represented by the following formula (A). By employing the liquid crystal aligning agent, viscosity chages are not liable to generate at the room temperature, when being coated, the liquid crystal aligning agent is not sunken, when be produced, the liquid crystal aligning agent is not whitened. In addition, the orientation stability of liquid crystal molecules of a liquid crystal alignment film formed by the liquid crystal aligning agent is good. Furthermore, the residual image features of a liquid crystal display element provided with the liquid crystal alignment film are excellent.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent for forming a liquid crystal aligning film of a liquid crystal display element and a liquid crystal display element. More specifically, the present invention relates to a liquid crystal aligning agent that does not easily cause a change in viscosity at room temperature, and does not cause sag (cissing) or whitening of an alignment film formed by coating the alignment agent, and has a liquid crystal alignment agent composed of the A liquid crystal display element of a liquid crystal aligning film obtained by a liquid crystal aligning agent. Background technique [0002] For liquid crystal display elements, a liquid crystal alignment film containing polyamic acid, polyimide, etc. is formed on the surface of a substrate provided with transparent electrodes or metal electrodes as a substrate for liquid crystal display elements, and two substrates for liquid crystal display elements are arrang...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337
Inventor 片野裕子田村典央小口雄二郎山内孝浩久田梨香
Owner JNC CORP
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