Liquid crystal photo-alignment agent and liquid crystal photo-alignment film and liquid crystal display
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一种光取向、液晶的技术，应用在LCD。领域，能够解决集聚、不能形成均匀膜等问题
Inactive Publication Date: 2009-06-10
CHEIL IND INC
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[0012] Therefore, the liquid crystal photoalignment agent prepared by using the above solvents has improved printability due to rapid spreading on the substrate, but there is a problem of accumulation at the end of the substrate after printing, so that a uniform film cannot be formed
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preparation example 1
[0211] Preparation Example 1: Preparation of Polyamic Acid Copolymer (PAA-1)
[0212] 0.7 mol of phenylenediamine, 0.15 mol of functional diamine 3,5-diaminophenyldecylsuccinimide of following chemical formula 24 and 0.15 mol of the following chemical formula 25 of diaminobenzoic acid 4-(2-ethoxycarbonyl-vinyl)-phenyl ester was added to a four-necked flask equipped with a stirrer, a temperature controller, a nitrogen injector and a cooler, and nitrogen was fed from beginning to end, and N-methyl -2-pyrrolidone (NMP) was added thereto to obtain a mixed solution.
[0213] [Chemical formula 24]
[0214]
[0215] [Chemical formula 25]
[0216]
[0217] In the above general formula 25, n=2.
[0218] 1.0 mol of solid 1,2,3,4-cyclobutyltetracarboxylic dianhydride was added to the above mixed solution and vigorously stirred. The amount of solids is 20% by weight. The reaction was carried out for 10 hours while the temperature was kept at 30° C. to 50° C. to obtain a polyami...
preparation example 2
[0219] Preparation Example 2: Preparation of Polyamic Acid Copolymer (PAA-2)
[0220] The polyamic acid solution (PAA-2) was prepared according to the same process as Preparation Example 1, except that the functional diamine shown in the following chemical formula 26 was used instead of the functional diamine shown in chemical formula 24.
[0221] [Chemical formula 26]
[0222]
preparation example 3
[0223] Preparation Example 3: Preparation of Polyamic Acid Copolymer (PAA-3)
[0224] The polyamic acid solution (PAA-3) was prepared according to the same process as Preparation Example 1, except that the functional diamine shown in the following chemical formula 27 was used instead of the functional diamine shown in chemical formula 24.
[0225] [Chemical formula 27]
[0226]
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Abstract
One embodiment of the present invention provides a liquid crystal photo-alignment agent that includes a polyamic acid copolymer including a repeating unit having the following Formula 1 and a repeating unit having the following Formula 2; a polyimide copolymer including a repeating unit having the following Formula 3 and a repeating unit having the following Formula 4; or a combination thereof: wherein the definition of R1 to R8 are the same as in the specification. The liquid crystal photo-alignment agent can have improved liquid crystal alignment properties, electrical characteristics such as voltage holding ratio, pretilt angle, residual DC, and the like, printability, cleaning stability, and spot stability, and is capable of unidirectionally aligning liquid crystals by ultraviolet (UV) exposure.
Description
technical field [0001] The present invention relates to a liquid crystal photo-alignment agent and a liquid crystal photo-alignment film for a liquid crystal display (LCD) and an LCD comprising the film. Background technique [0002] A liquid crystal display (LCD) includes a liquid crystal alignment film. The liquid crystal alignment film is mainly made of polymer materials. The liquid crystal alignment film functions as an orienter in the alignment of liquid crystal molecules. When liquid crystal molecules move under the influence of an electric field to display images, the liquid crystal alignment film aligns the liquid crystal molecules in a predetermined direction. In general, in order to provide uniform brightness and high contrast ratio to a liquid crystal device, it is necessary to uniformly align liquid crystal molecules. [0003] A conventional method of aligning liquid crystals involves coating a polymer film such as polyimide on a substrate made of a material s...
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