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Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element using the same

A liquid crystal alignment agent, the technology of making tetracarboxylic dianhydride, applied in the directions of instruments, optics, nonlinear optics, etc., can solve problems such as difficulty in meeting, and achieve the effect of maintaining the stability of liquid crystal alignment

Active Publication Date: 2019-01-15
NISSAN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, with the high performance of liquid crystal display elements, the characteristics required for liquid crystal alignment films are gradually becoming stricter, and it is difficult to meet all the required characteristics when only using existing technologies

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element using the same
  • Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element using the same
  • Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] Hereinafter, with regard to the specific details of the production method of the present invention, experimental methods and results thereof, as well as examples of typical production methods, etc., which were studied on the composition of raw materials and compounding ratios, will be described. In addition, this invention is not limited to these Examples.

[0085] Explanation of abbreviations used in this example

[0086] (tetracarboxylic dianhydride)

[0087] Tetracarboxylic dianhydrides of the following CA-1 to CA-7

[0088]

[0089]

[0090] (diamine)

[0091] Diamine compounds of the following DA-1 and DA-2

[0092]

[0093] (Organic solvents)

[0094] NMP: N-methyl-2-pyrrolidone

[0095] BCS: Butyl Cellosolve

[0096] (additive)

[0097] LS-3150: 3-Aminopropyltriethoxysilane

[0098] Each measurement method is shown below.

[0099]

[0100] After filtering the obtained liquid crystal aligning agent with a filter of 1.0 μm, it was spin-coated on...

Synthetic example 1

[0119] Add 7.64g (26.5mmol) of DA-1, 10.4g (26.5mmol) of DA-2, and 100g of N-methyl-2-pyrrolidone to a 200ml four-neck flask equipped with a stirring device and a nitrogen gas introduction tube, and feed nitrogen gas Stir to dissolve. 5.78 g (26.5 mmol) of CA-1 and 3.98 g (15.9 mmol) of CA-3 were added, stirring this diamine solution, and it stirred at 50 degreeC for 3 hours. Thereafter, the temperature of the reaction solution was lowered to 23° C., 1.66 g (8.48 mmol) of CA-2 and N-methyl-2-pyrrolidone were added so that the solid content concentration became 15% by mass, and the mixture was stirred at 23° C. for 20 hours to obtain A solution of polyamic acid (abbreviated as P1). When the viscosity at 25 degreeC of this polyamic-acid (P1) solution was confirmed with the E-type viscometer (made by Toki Sangyo Co., Ltd.), it was 481 mPa*s.

[0120] 87.4 g of N-methyl-2-pyrrolidones, 0.075 g of LS-3150, and 50 g of butyl cellosolves were added to 100 g of this polyamic acid (P...

Synthetic example 2

[0122] Add 7.79g (27.0mmol) of DA-1, 10.6g (27.0mmol) of DA-2 and 100g of N-methyl-2-pyrrolidone to a 200ml four-neck flask equipped with a stirring device and a nitrogen gas inlet tube, and feed nitrogen gas Stir to dissolve. 5.89 g (27.0 mmol) of CA-1 and 3.21 g (16.2 mmol) of CA-4 were added, stirring this diamine solution, and it stirred at 50 degreeC for 3 hours. Thereafter, the temperature of the reaction solution was lowered to 23° C., 1.70 g (8.64 mmol) of CA-2 and N-methyl-2-pyrrolidone were added so that the solid content concentration became 15% by mass, and the mixture was stirred at 23° C. for 20 hours to obtain The solution of polyamic acid (abbreviated as P2). When the viscosity in 25 degreeC of this polyamic-acid (P2) solution was confirmed with the E-type viscometer (made by Toki Sangyo Co., Ltd.), it was 512 mPa*s.

[0123] 87.4 g of N-methyl-2-pyrrolidones, 0.075 g of LS-3150, and 50 g of butyl cellosolves were added to 100 g of this polyamic acid (P2) sol...

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Abstract

A liquid crystal alignment agent containing at least one of: a polyamic acid obtained by reacting a tetracarboxylic acid dianhydride component including at least one tetracarboxylic acid dianhydride selected from an aromatic tetracarboxylic acid dianhydride and an aliphatic tetracarboxylic acid dianhydride, and a diamine component including at least one diamine selected from a diamine having a tertiary nitrogen atom and a diamine having the structure of formula (1); and a polyimide obtained by imidization of the polyamic acid. In formula (1), R1 and R2 are each independently a C1-5 alkylene group.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal aligning film used in a liquid crystal display element driven by applying a parallel electric field to a substrate, and a liquid crystal display element using the same. Background technique [0002] Conventionally, liquid crystal devices have been widely used as display units of personal computers, mobile phones, and television display units. A liquid crystal device includes, for example, a liquid crystal layer sandwiched between an element substrate and a color filter substrate, a pixel electrode and a common electrode for applying an electric field to the liquid crystal layer, an alignment film for controlling the orientation of liquid crystal molecules in the liquid crystal layer, and Thin film transistors (TFTs) for switching electrical signals supplied to pixel electrodes and the like. As methods for driving liquid crystal molecules, there are known longitudinal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/105G02F1/133711
Inventor 石井秀则
Owner NISSAN CHEM CORP
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