Liquid crystal alignment agents and liquid crystal display elements
A technology of liquid crystal display element and liquid crystal alignment agent, which can be used in liquid crystal materials, chemical instruments and methods, optics, etc., and can solve problems such as poor liquid crystal alignment
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[0089] The present invention will be further specifically described below through examples, but the present invention is not limited by these examples. In the following examples and comparative examples, the evaluation items and evaluation methods for the prepared liquid crystal aligning agent are as follows.
[0090] [Orientation of liquid crystal]
[0091] A liquid crystal display element using the obtained coating film as a liquid crystal aligning film was subjected to ON / OFF (applied / released) voltage, and observed with a polarizing microscope to see if there were any abnormal areas at this time. If there were no abnormal areas, it was judged as "good".
[0092] [Surface condition of coating film printed using liquid crystal aligning agent]
[0093] Prepare a 127 mm (D) × 127 mm (W) × 1.1 mm (H) glass substrate with an ITO film formed on the entire surface of one side, and use the liquid crystal aligning agent obtained in the above experiment in an environment of 25 ° C o...
Synthetic example 1
[0095] 112 g (0.50 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride, 1,3,3a, 4,5,9b-hexahydro-8-methyl-5- (Tetrahydro-2,5-dioxo-3-furyl)-naphtho[1,2-c]-furan-1,3-dione 157g (0.50mol), terephthalamide as a diamine compound Amine 95g (0.88mol), diaminopropyltetramethyldisiloxane 25g (0.10mol), 3,6-bis(4-aminobenzoyloxy)cholestane 6.4g (0.010mol), 4 - 4.0 g (0.030 mol) of aminophenyl octadecyl ether was dissolved in 4,500 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours. Then, 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23 g of pyridine and 18 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes the pyridine and acetic anhydride used in the imidation reaction from the system) to obtain the solid content concentration 15% by weig...
Synthetic example 2
[0097] 112g (0.50mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 1,3,3a,4,5,9b-hexahydro-8-methyl-5- (Tetrahydro-2,5-dioxo-3-furyl)naphtho[1,2-c]-furan-1,3-dione 157 g (0.50 mol), p-phenylenediamine as a diamine compound 90g (0.83mol), 25g (0.10mol) of diaminopropyl tetramethyldisiloxane and 4-(4'-trifluoromethoxybenzoyloxy)cyclohexyl-3,5-diaminobenzene 26 g (0.060 mol) of formate and 1.4 g (0.015 mol) of aniline as a monoamine were dissolved in 4,500 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours. Then, 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23 g of pyridine and 18 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes the pyridine and acetic anhydride used in the imidation reaction from the system) to obtain the so...
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