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Liquid crystal aligning agent

A liquid crystal alignment agent and polymer technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of difficult ionic charge detachment, image afterimage, etc., achieve low residual DC voltage, improve afterimage characteristics, high voltage Retention rate and effect of residual DC voltage

Active Publication Date: 2013-05-01
DAXIN MATERIALS
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Problems solved by technology

[0005] However, when a voltage is applied to the liquid crystal display, the generated ionic charges will be absorbed by the liquid crystal alignment film, and even after the applied voltage is released, it is difficult to detach the ionic charges from the liquid crystal alignment film, thus causing the screen Afterimage problem

Method used

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example

[0102] Synthesis methods of Synthesis Example Polymers A1-A7 will be described below.

[0103] Add the tetracarboxylic dianhydride compounds listed in Table 1 and the diamine compounds listed in Table 2 to N-methyl-2-pyrrolidone (the ratio is shown in Table 3) to prepare a solid content of 25% by weight solution, and react at 40°C for 5 to 6 hours to obtain polyamic acid. Next, add an appropriate proportion of acetic anhydride and pyridine to the obtained polyamic acid solution (the amount depends on the imidization ratio), and perform a dehydration / ring closure reaction at 100°C to 110°C for 3 to 4 hours.

[0104] The amount of acetic anhydride in the above appropriate proportion is preferably 0.01 to 20 moles of acetic anhydride per 1 mole of polyimide-polyamic acid reproducing units. It is preferable to use 0.01 to 10 moles of pyridine per 1 mole of acetic anhydride.

[0105] The resulting solution was precipitated with ethanol and purified with ethanol. Finally, they we...

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Abstract

The present invention provides a liquid crystal aligning agent which has the following advantages: low blur characteristic, low residual DC voltage and excellent voltage retention rate. The liquid crystal aligning agent comprises at least one polymer which comprises a polymer A and a polymer B. The polymer A is polyimide-polyamide acid which is represented by a formula A, and the polymer B is polyimide-polyamide acid which is represented by a formula 2.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent, and in particular to a liquid crystal alignment agent capable of improving performance of liquid crystal display elements. Background technique [0002] Liquid crystal display (liquid crystal display) is a display that utilizes the photoelectric changes of liquid crystals. It has attractive advantages such as small size, light weight, low power consumption, and good display quality. Therefore, it has become the mainstream of flat-panel displays in recent years. [0003] Among the liquid crystal displays, a twisted nematic (TN) electric field effect type liquid crystal display is typically used, which uses a nematic liquid crystal having a positive dielectric anisotropy. Generally speaking, liquid crystal molecules are placed between a pair of substrates containing electrodes, and the alignment directions of the two substrates are perpendicular to each other, and the arrangement of liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56
Inventor 李柏毅张立心林冠铭赖铭智
Owner DAXIN MATERIALS
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