Liquid crystal aligning agent and in-plane switching mode liquid crystal display
A technology of liquid crystal display element and liquid crystal alignment agent, which is applied in the direction of instruments, optics, nonlinear optics, etc., and can solve problems such as poor printing and poor orientation
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[0074] Hereinafter, although an Example demonstrates more concretely, this invention is not limited to these Examples.
[0075] In addition, various measurements of Examples and Comparative Examples were performed by the following methods.
[0076] (1) Liquid crystal orientation
[0077] When voltage was applied and released to the liquid crystal display element which used the obtained coating film as a liquid crystal aligning film, it observed whether there was an abnormal area with a polarizing microscope, and it judged as "good" when there was no abnormal area.
[0078] (2) Printability evaluation
[0079] A glass substrate of 127 mm (D) x 127 mm (W) x 1.1 mm (H) in which an ITO film was formed on the entire surface was prepared. After filtering the liquid crystal alignment agent obtained in the above experiment with a microporous filter with a pore size of 0.2 μm, in an environment of 25° C. or 35° C., use a printing machine for coating liquid crystal alignment film (man...
Synthetic example 1
[0081] 196g (0.90 mole) pyromellitic anhydride and 20g (0.10 mole) 1,2,3,4-cyclobutane tetracarboxylic dianhydride as tetracarboxylic dianhydride, 108g (1.0 mole) as diamine compound Phenylenediamine was dissolved in 1,680g of N-methyl-2-pyrrolidone, and reacted for 4 hours at 40°C to obtain 2,000g of a polyamic acid solution with a solid content concentration of 16% by weight (referred to as "polyamic acid (A) -1)"). A small amount of the obtained polyamic acid was fractionated and N-methyl-2-pyrrolidone was added to obtain a solution having a solid content concentration of 10% by weight. When the viscosity was measured, the viscosity was 60 mPa·s.
Synthetic example 2
[0083] 224g (1.0 moles) of 2,3,5-tricarboxycyclopentylacetic dianhydride and 108g (1.0 moles) of p-phenylenediamine were dissolved in 1,300g of N-methyl-2-pyrrolidone and reacted at room temperature for 6 hours . A small amount of the obtained polyamic acid solution was fractionated and NMP was added to obtain a solution having a solid content concentration of 10% by weight. When the viscosity was measured, the viscosity was 76 mPa·s. Then, 2,000 g of N-methyl-2-pyrrolidone was added and diluted to the obtained polyamic-acid solution. 160 g of pyridine and 210 g of acetic anhydride were added to this solution, followed by dehydration and ring closure at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes pyridine and acetic anhydride used in the imidation reaction from the system), and obtains about 2,000 g of solid content An imidized polymer (referred to as "Imidated polymer (B-1)") soluti...
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Abstract
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