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

A liquid crystal alignment agent, liquid crystal technology, applied in the direction of instruments, optics, nonlinear optics, etc., to achieve the effect of excellent display characteristics, not easy to flicker, and promote movement

Active Publication Date: 2019-04-02
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the performance of liquid crystal display elements increases, the performance required for liquid crystal alignment films becomes more stringent, and it is difficult for these existing technologies to fully meet all performance requirements.

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

[0163] Hereinafter, examples and the like are given and the present invention will be specifically described, but the present invention is not limited to these examples. In addition, the abbreviation of a compound and a solvent is as follows.

[0164] NMP: N-methyl-2-pyrrolidone GBL: γ-butyrolactone

[0165] BCS: Butyl Cellosolve

[0166]

[0167]

[0168] The viscosity of the polymer solution was measured using an E-type viscometer TVE-22H (manufactured by Toki Sangyo Co., Ltd.), with a sample volume of 1.1 mL, a cone rotor TE-1 (1°34', R24), and a temperature of 25°C.

[0169]

[0170] The imidization rate of polyimide was measured as follows. 30 mg of polyimide powder was added to NMR (nuclear magnetic resonance) sample tube (NMR standard sampling tube, φ 5 (manufactured by Kusano Science Co., Ltd.)), and deuterated dimethyl sulfoxide (DMSO-d6, 0.05 mass % TMS (four Methylsilane) mixture) (0.53ml) was dissolved completely by applying ultrasonic waves. Proton NMR ...

Synthetic example 1

[0174] Measure DA-1 54.7g (224mmol) and DA-2 53.4g (95.9mmol) in a 1L four-necked flask equipped with a stirring device and a nitrogen gas inlet tube, add 613g of NMP, and stir while feeding nitrogen gas. dissolve. While stirring this diamine solution under water cooling, 89.5 g (298 mmol) of CA-1 was added, and 175 g of NMP was further added, and stirred at 23° C. for 12 hours under a nitrogen atmosphere to obtain a polyamic acid (viscosity: 890 mPa·s) The solution.

[0175] 900 g of this polyamic acid solution was fractionated into a 3 L Erlenmeyer flask equipped with a stirrer, 1350 g of NMP, 74.3 g of acetic anhydride, and 34.6 g of pyridine were added, stirred at room temperature for 30 minutes, and then reacted at 40° C. for 2 hours. This reaction solution was poured into 8300 g of methanol, and the obtained precipitate was filtered off. After washing this deposit with methanol, it dried under reduced pressure at a temperature of 60 degreeC, and obtained the powder of ...

Synthetic example 2

[0178] Measure 86.0 g (352 mmol) of DA-1, 53.4 g (95.9 mmol) of DA-2 and 76.5 g (191 mmol) of DA-3 in a 1 L four-necked flask with a stirring device and a nitrogen inlet tube, 1580 g of NMP was added, stirred and dissolved while sending nitrogen gas. While stirring this diamine solution under water cooling, CA-2 93.2 g (416 mmol) was added, and NMP168g was added further, and it stirred at 40 degreeC in nitrogen atmosphere for 3 hours. Furthermore, CA-3 28.2g (143 mmol) was added, and NMP160g was added further, and it stirred at 23 degreeC for 4 hours under nitrogen atmosphere, and obtained the solution (viscosity: 200mPa*s) of a polyamic acid.

[0179] 800 g of this polyamic acid solution was fractionated into a 3 L Erlenmeyer flask equipped with a stirring bar, 700 g of NMP, 69.7 g of acetic anhydride, and 18.0 g of pyridine were added, stirred at room temperature for 30 minutes, and reacted at 55° C. for 3 hours. This reaction solution was poured into 5600 g of methanol, an...

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Abstract

Provided are: a liquid crystal aligning agent which enables the achievement of a liquid crystal alignment film that exhibits excellent voltage holding ratio and quick reduction of accumulated charge,while being not susceptible to the occurrence of flicker during driving; a liquid crystal alignment film; and a liquid crystal display element. A liquid crystal aligning agent which contains a polymer(A) having a structure represented by formula (1) and a polymer (B) having a structure represented by formula (2). In formula (1), R1 represents a hydrogen atom or an alkyl group having 1-3 carbon atoms. In formula (2), R2 represents a single bond or a divalent organic group; R3 represents a structure represented by -(CH2)n- (wherein n represents an integer of 2-20; an arbitrary -CH2- may be substituted by a bond selected from among an ether bond, an ester bond, an amide bond, a urea bond and a carbamate bond under such conditions that the substituents are not next to each other; and a hydrogen atom in the amide bond or the urea bond may be substituted by a methyl group or a tert-butoxycarbonyl group); R4 represents a single bond or a divalent organic group; and an arbitrary hydrogen atomon the benzene ring may be substituted by a monovalent organic group.

Description

technical field [0001] The invention relates to a novel liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element using the liquid crystal aligning film. Background technique [0002] Liquid crystal display devices are widely used as display parts of computers, mobile phones, smartphones, and televisions. The liquid crystal display element includes, for example, a liquid crystal layer sandwiched between an element substrate and a color filter substrate, a pixel electrode and a common electrode that apply an electric field to the liquid crystal layer, an alignment film that controls the orientation of liquid crystal molecules of the liquid crystal layer, a switching supply to The thin film transistor (TFT) of the electrical signal of the pixel electrode, etc. As a method for driving liquid crystal molecules, longitudinal electric field methods such as the TN method and the VA method, and transverse electric field methods such as the I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/10G02F1/1337
Inventor 巴幸司森本佳道石井秀则
Owner NISSAN CHEM IND LTD
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