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

A technology of liquid crystal alignment agent and compound, which is applied in the field of liquid crystal alignment film and liquid crystal display elements, liquid crystal display elements, and liquid crystal alignment agents, and can solve problems such as impact, liquid crystal layer impurity pollution, and restriction

Inactive Publication Date: 2019-01-11
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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0185] The preparation method of polysiloxane (B)

[0186] step (i)

[0187] The polycondensation reaction of the polysiloxane compound can use a general method, for example, adding an organic solvent, water, or optionally a catalyst to the above-mentioned silane compound or a mixture thereof, and then using an oil bath or the like to perform condensation at 50°C to 150°C. Heating, the preferred heating time is 0.5 hours to 120 hours. During heating, the mixture can be stirred or placed under reflux conditions.

[0188] The above-mentioned organic solvent is not particularly limited, and may be the same as or different from the solvent (D) contained in the liquid crystal alignment agent of the present invention.

[0189] Specific examples of the organic solvent include hydrocarbon compounds such as toluene and xylene; ketones such as methyl ethyl ketone, methyl isobutyl ketone, methyl n-amyl ketone, diethyl ketone, cyclohexanone, etc. Compounds; ester compounds of ethyl ace...

Synthetic example

[0281] Synthesis Example A-1-1 to Synthesis Example A-1-6 of the polymer (A) are described below:

Synthetic example A-1-1

[0283] 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 1.16 grams (0.0025 moles) of the diamine compound (abbreviated as a2-1-1) represented by formula (II-10), 4.86 grams (0.045 moles) of p-diaminobenzene (referred to as a2-2-1), 0.49 grams (0.0025 moles) of 4,4'-diaminodicyclohexylmethane (referred to as a2-2-4) and 80 grams of N-methyl-2-pyrrolidone ( 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 o...

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Abstract

The invnetion provides a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. A 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 diamine component (a2) includes at least one of diamine compound (a2-1) represented by formula (II). The polysiloxane (B) contains at least one functional group selected from a group consisting of ethylenically unsaturated group. The liquid crystal alignment agent can form a liquid crystal display element having excellent ultraviolet recession-resistance and colorless unevenness.

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 color unevenness, 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 type liquid crystal d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/133711
Inventor 黄菀婷
Owner CHI MEI CORP
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