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

A liquid crystal aligning agent and solvent technology, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of UV decay resistance, uneven hue, uneven hue of liquid crystal display elements, poor electrical properties, etc., and achieve UV decay resistance. good effect

Inactive Publication Date: 2016-05-25
CHI MEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, it is necessary to irradiate, for example, 100,000 J / m in order to polymerize the polymerizable compound 2 A large amount of ultraviolet rays, so in addition to the risk of decomposition of liquid crystal molecules, unreacted compounds that are not polymerized by irradiation with ultraviolet rays also remain in the liquid crystal layer, forming contamination by impurities, and causing the liquid crystal display element to have uneven hue (mura). problems, especially with adverse effects on electrical characteristics
In addition, the type of liquid crystal molecules used in the liquid crystal layer must also be limited in response to the added polymeric compound.
[0005] Therefore, how to solve the problem of impurity contamination in the above-mentioned liquid crystal layer, and provide a liquid crystal display element with good resistance to ultraviolet decay and no uneven hue, is currently an active research topic for those skilled in the art.

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

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preparation example Construction

[0232]

[0233] The preparation method of the liquid crystal alignment agent of the present invention is not particularly limited, and can be prepared by a general mixing method. For example, the polymer (A), the polysiloxane (B), and the polymerizable compound (C) containing a benzophenone structure prepared in the above manner are uniformly mixed to form a mixture. Then, the solvent (D) is added under the condition that the temperature is 0°C to 200°C, and the additive (E) is optionally added, and finally the stirring device is continuously stirred until dissolved. In addition, it is preferable to add the solvent (D) at a temperature of 20°C to 60°C.

[0234] At 25° C., the viscosity of the liquid crystal alignment agent of the present invention is generally 15 cps to 35 cps, preferably 17 cps to 33 cps, and more preferably 20 cps to 30 cps.

[0235]

[0236] After the liquid crystal alignment agent of the present invention is coated on the substrate, the coating film o...

Synthetic example

[0260] Synthesis Example A-1-1 to Synthesis Example A-1-5 of the polymer (A) are described below:

Synthetic example A-1-1

[0262] A nitrogen inlet, a stirrer, a condenser, and a thermometer were arranged on a four-necked flask with a capacity of 500 milliliters, and nitrogen was introduced. Then, in the four-necked flask, add 4.86 grams (0.045 moles) of p-diaminobenzene (abbreviated as a2-1), 1.91 grams (0.005 moles) of diamine compounds represented by formula (II-12) (abbreviated as a2-4) and 80 grams of N-methyl-2-pyrolidone (abbreviated as NMP), and stirred at room temperature until dissolved. Next, 9.80 g (0.05 mol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride (abbreviated as a1-1) and 20 g of NMP were added and reacted at room temperature for 2 hours. After the reaction was finished, the reaction solution was poured into 1500 milliliters of water, so that the polymer was precipitated. Then, the obtained polymer was filtered, washed with methanol and filtered three times, placed in a vacuum oven, and dried at a temperature of 60° C. to obtain the polymer (A-1-1).

[0263] Synthesis Exam...

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Abstract

A liquid crystal alignment agent capable of forming a liquid crystal display element having good resistance to ultraviolet decay and no mura effect, a liquid crystal alignment film, and a liquid crystal display element having the same are provided. The liquid crystal alignment agent includes a polymer (A), a polysiloxane (B), a polymerizable compound (C) containing a benzophenone structure, and a solvent (D). The polymer (A) is obtained by reacting a mixture. The mixture includes a tetracarboxylic dianhydride component (a1) and a diamine component (a2). The polysiloxane (B) contains a polymerizable unsaturated group, wherein the polymerizable unsaturated group includes a group represented by formula (1-1), a group represented by formula (1-2), or a combination of the two.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element, in particular to a liquid crystal alignment agent capable of forming a liquid crystal display element with good ultraviolet decay resistance and no uneven color phase, formed by the above liquid crystal alignment agent A liquid crystal alignment film and a liquid crystal display element having the above liquid crystal alignment film. Background technique [0002] With the development of liquid crystal displays towards large-size display specifications, in order to overcome the viewing angle problem under large-size displays, the wide viewing angle technology of liquid crystal display panels must also continuously improve and break through. A multi-domain vertical alignment (MVA for short) liquid crystal display panel is a common wide viewing angle technology. In the multi-domain vertical alignment liquid crystal disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56C08L79/08C09K19/20C09K19/2014C09K19/36
Inventor 黄菀婷
Owner CHI MEI CORP
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