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

A liquid crystal alignment agent and component technology, applied in liquid crystal materials, coatings, instruments, etc., can solve problems such as impurity pollution, liquid crystal layer impurity pollution, and poor electrical characteristics

Inactive Publication Date: 2016-05-11
CHI MEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in order to polymerize the polymerizable compound, it is necessary to irradiate a large amount of ultraviolet light such as 100000J / m2. Therefore, in addition to the risk of decomposition of liquid crystal molecules, unreacted compounds that are not polymerized by ultraviolet irradiation also remain in the liquid crystal layer at the same time, forming impurity contamination ( contamination), which causes the problem of uneven hue (mura) of the liquid crystal display component, especially has a bad influence on the 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 above-mentioned problem of impurity contamination in the liquid crystal layer, and provide a liquid crystal display component with good resistance to ultraviolet decay and no uneven hue, is actually 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

Experimental program
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preparation example Construction

[0261]

[0262] 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), polysiloxane (B), and photopolymerizable compound (C) prepared in the above manner are firstly mixed uniformly to form a mixture. Then, the solvent (D) is added under the condition of temperature ranging from 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.

[0263] 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.

[0264]

[0265] After the liquid crystal alignment agent of the present invention is coated on the substrate, if necessary, the coating film obtained b...

Synthetic example

[0289] Synthesis Example A-1-1 to Synthesis Example A-1-5 of the polymer (A) are described below:

Synthetic example A-1-1

[0291] 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 the diamine compound ( a2-2-4 for short) and 80 grams of N-methyl-2-pyrolidone (NMP for short), 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).

[0292] Synthesis Example A-1-2 to Synthesis Example A-1-5

[0293] Synthesis Example A-1-2 to Synthesis Example A-1-5 are the same steps as Synthesis E...

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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 photopolymerizable compound (C), 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 component, in particular to a liquid crystal alignment agent capable of forming a liquid crystal display component with good ultraviolet decay resistance and no color unevenness, formed by the above liquid crystal alignment agent A liquid crystal alignment film and a liquid crystal display assembly 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 d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/133723C09K19/32C09K2019/0448C09K2019/122C09K2019/2035C09K2019/2078C09D179/08C08G73/1042C08G73/1067C08G73/1078C08G77/14C08G77/20G02F1/133788C08G77/80G02F1/133711G02F1/139C08K5/09C08L83/04
Inventor 黄菀婷
Owner CHI MEI CORP
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