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

A liquid crystal alignment agent, liquid crystal technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of liquid crystal alignment film defects, display defects, dust production, etc., and achieve the effect of improving sealing and good characteristics

Active Publication Date: 2020-07-10
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, as the liquid crystal alignment treatment, the surface treatment by brushing was mainly carried out, but the brushing treatment is usually difficult to perform an alignment treatment with a uniform height, and sometimes poor alignment of liquid crystals or defects in the liquid crystal alignment film occur, and the resulting defects occur. Indicates problems such as defects or dust production
In recent years, due to the increase in size, high definition, and cost reduction of the substrate used in the panel, there is a tendency for the area of ​​the substrate to increase and the unevenness to increase. When forming an alignment film on this substrate, the brushing process still remains room for improvement

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0096]

[0097] A known method can be used for the method of obtaining the polyamic acid of this invention by reaction of a tetracarboxylic dianhydride component and a diamine component. Usually, it is the method of making a tetracarboxylic dianhydride component and a diamine component react in an organic solvent. The reaction between the tetracarboxylic dianhydride component and the diamine is relatively easy in an organic solvent and is advantageous in that a by-product is not formed.

[0098] The organic solvent used for the reaction of the tetracarboxylic dianhydride component and diamine is not limited as long as it can dissolve the polyamic acid produced. Specific examples thereof are given below.

[0099] N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-methylcaprolactam, dimethylmethylene Sulfone, Tetramethylurea, Pyridine, Dimethylsulfone, Hexamethylsulfoxide, γ-Butyrolactone, Isopropanol, Methoxymethylpentanol, Dipent...

Embodiment

[0136] Hereinafter, examples are given to describe the present invention in more detail, but the interpretation of the present invention is not limited to these examples. The abbreviations used in the Examples and the method of property evaluation are as follows.

[0137]

[0138]

[0139] NMP: N-methyl-2-pyrrolidone BCS: Butyl cellosolve

[0140]

[0141] LS-4668: 3-Glycidoxypropyltriethoxysilane

[0142]

[0143] Using an E-type viscometer TVE-22H (manufactured by Toki Sangyo Co., Ltd.), the viscosity of the solution was measured at a temperature of 25°C with a sample volume of 1.1 mL and a cone rotor TE-1 (1°34', R24).

[0144]

[0145]First, a substrate with electrodes is prepared. The substrate was a glass substrate having a rectangular shape of 30 mm in length×35 mm in width and a thickness of 0.7 mm. On the substrate, an ITO electrode having a solid pattern for constituting a counter electrode was formed as a first layer. On the counter electrode of the f...

Synthetic example 1

[0159] Make a 50mL four-necked flask with a stirring device into a nitrogen atmosphere, measure DA-1 1.56g (5.28mmol), DA-4 1.91g (7.82mmol) and DA-6 0.724g (1.30mmol), add NMP 46.5 g, stirring and dissolving while sending nitrogen gas. While stirring the diamine solution, 2.71 g (12.4 mmol) of CA-1 was added, stirred at room temperature for 2 hours, and then stirred at 50° C. for 24 hours to obtain a polyamic acid solution (viscosity: 485.1 mPa·s, PAA- 1).

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Abstract

Provide a kind of liquid crystal aligning agent, it can improve the sealing adhesiveness of the liquid crystal display element sealed with sealant, and the liquid crystal aligning property of the obtained liquid crystal aligning film, the characteristic such as pretilt angle is good and can not be colored as dark brown and does not lose transparency sex. A liquid crystal aligning agent containing at least one selected from the group consisting of a polyamic acid and a polyimide obtained by imidizing the polyamic acid, the polyamic acid being composed of a diamine component and The reaction of the tetracarboxylic dianhydride component which contains the diamine which has the structure of a formula [1], the diamine which has a structure of a formula [2], and the diamine which has a structure of a formula [3] is obtained. (The definitions of the symbols in the formula are as described in the specification.)

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film using the same, and a liquid crystal display element. Background technique [0002] The liquid crystal alignment film is a component of a liquid crystal display element widely used as a display device, and it is responsible for aligning liquid crystals in a certain direction. The main liquid crystal aligning film currently used industrially is formed using the liquid crystal aligning agent which consists of polyamic acid (also called polyamide acid) which is a polyimide precursor, or the solution of a polyimide. Specifically, it is obtained by applying a liquid crystal aligning agent on a substrate, heating and firing, and then performing a liquid crystal aligning treatment. [0003] In the past, as the liquid crystal alignment treatment, the surface treatment by brushing was mainly carried out, but the brushing treatment is usually difficult to perform an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10
CPCC08G73/10G02F1/1337C09K19/56C08L79/08C09D179/08G02F1/133723
Inventor 铁谷尚士林武重吴静如志田启文
Owner NISSAN CHEM IND LTD
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