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Liquid crystal alignment agent for forming liquid crystal alignment film for light alignment, liquid crystal alignment film thereof, and liquid crystal display element with the same

A liquid crystal alignment agent and photo-alignment technology, applied in liquid crystal materials, optics, nonlinear optics, etc., can solve the problems of damaged display, poor, low transmittance, etc.

Inactive Publication Date: 2013-10-30
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubbing method has the following problems: the removal of the alignment film that occurs in the step, or the display defect caused by the adhesion of fiber dust, etc., or the thin-film transistor (Thin-Film-Transistor, TFT) element is due to the generation of static electricity. Defective display caused by damage
However, since this photoreactive group absorbs light, there is a problem that the transmittance becomes low, and there is room for improvement.

Method used

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  • Liquid crystal alignment agent for forming liquid crystal alignment film for light alignment, liquid crystal alignment film thereof, and liquid crystal display element with the same
  • Liquid crystal alignment agent for forming liquid crystal alignment film for light alignment, liquid crystal alignment film thereof, and liquid crystal display element with the same
  • Liquid crystal alignment agent for forming liquid crystal alignment film for light alignment, liquid crystal alignment film thereof, and liquid crystal display element with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0691] Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. The evaluation method of the liquid crystal display element in an Example is as follows.

[0692]

[0693] The weight average molecular weight of a polyamic acid was calculated|required by the GPC method using 2695 separation module·2414 differential refractometers (made by Waters), and performed 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.

[069...

Synthetic example 1

[0710] 1.543 g of diamine (VII-1-1) and 30.0 g of dehydrated NMP were added 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 stirred and dissolved under a dry nitrogen stream. Then, 1.140 g of acid dianhydrides (AN-2-1), 0.317 g of (AN-3-2), and 7.0 g of dehydrated NMPs 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 44,400.

[0711] [Synthesis Example 2~Synthesis Example 10]

[0712] Except for changing tetracarboxylic dianhydride and diamine as shown in Table 1, polyamic acid solutions (PA2) to polyamic acid solutions (PA10) with a polymer solid content concentration of 6 wt% were prepared according to Synthesis...

Synthetic example 11

[0717] 0.596 g of diamine (DI-1-3) and 30 g of dehydrated NMP were added to a 50 mL brown four-neck flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen gas inlet, and stirred and dissolved under a dry nitrogen stream. Next, 2.404 g of acid dianhydride (1-a) (manufactured by Nippon Seika Co., Ltd.) and 7.0 g of dehydrated NMP 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. This polyamic acid solution was referred to as pA11. The weight average molecular weight of the polyamic acid contained in PA11 was 57,300.

[0718][Synthesis Example 12~Synthesis Example 29]

[0719] Except for changing tetracarboxylic dianhydride and diamine as shown in Table 2, according to Synthesis Example 11, polyamic acid solutions (PA12) to polyamic acid solutions (pA29) with a polymer solid content ...

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Abstract

The present invention provides a liquid crystal alignment agent for forming a liquid crystal alignment film for light alignment, the liquid crystal alignment film thereof, and a liquid crystal display element with the same. According to the invention, the liquid crystal alignment agent comprises the components of: (A) polyamide acid with an optically reactive structure or a derivative thereof; and (B) polyamide acid which is obtained from dianhydride represented by a formula (1) and diamine as raw materials or a derivative thereof. Furthermore after the alignment film is formed, the component (A) and the component (B) are divided into two layers in the vertical direction.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent for photoalignment, a photoalignment film using the liquid crystal alignment agent for photoalignment, and a liquid crystal display element with the photoalignment film. The liquid crystal alignment agent for photoalignment includes a specific alicyclic Polyamic acid or its derivatives obtained by reacting tetracarboxylic dianhydride of formula tetracarboxylic dianhydride with diamine. Background technique [0002] Various display devices such as personal computer monitors, liquid crystal televisions, video camera viewfinders, and projection displays, as well as optoelectronic-related components such as optical print heads, optical Fourier transform elements, and light valves, are commercialized and widely distributed today. The mainstream of the current liquid crystal display element is the display element using nematic liquid crystal. The display modes of nematic liquid crystal display elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/1007C08G73/106C08L79/08C09K19/56G02F1/133723
Inventor 片野裕子大木洋一郎松田智幸伊泽启介
Owner JNC CORP
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