Liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element using same
A technology of liquid crystal alignment agent and repeating unit, which is applied in liquid crystal materials, optics, instruments, etc., can solve problems such as display influence, disturbed liquid crystal orientation, and reduced contrast, and achieve high transmittance and voltage retention characteristics, good reworkability, Excellent contrast effect
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[0199] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. The abbreviations of the following compounds and the measurement methods of each characteristic are as follows. In addition, unless otherwise indicated, "%" means "mass %".
[0200] (diamine)
[0201] l-1: a compound represented by the following formula (l-1).
[0202] m-1: a compound represented by the following formula (m-1).
[0203] n-1: a compound represented by the following formula (n-1).
[0204] DA-1 to DA-7: compounds represented by the following formulae (DA-1) to (DA-7), respectively.
[0205] (tetracarboxylic dianhydride)
[0206] CA-1 to CA-4: compounds represented by the following formulae (CA-1) to (CA-4), respectively.
[0207] (Compound C)
[0208] C-1: a compound represented by the following formula (C-1).
[0209] (Compound D)
[0210] D-1: a compound represented by the following formula (D-1).
[0211] (...
Synthetic example 1
[0225] DA-2 (8.60 g, 35.2 mmol), DA-4 (5.34 g, 9.59 mmol), and DA-3 (7.65 g, 19.1 mmol) were weighed into a 1 L four-necked flask equipped with a stirring device and a nitrogen introduction tube. , NMP was added so that the solid content concentration would be 12%, and nitrogen was transported to dissolve it with stirring. While stirring this diamine solution under water cooling, CA-1 (9.32 g, 41.6 mmol) was added, and NMP was further added so that the solid content concentration would be 15%, and the mixture was stirred at 40° C. for 3 hours under a nitrogen atmosphere. Furthermore, CA-2 (2.82 g, 14.3 mmol) was added, NMP was added so that solid content concentration might become 15%, and it stirred at 23 degreeC in nitrogen atmosphere for 4 hours, and obtained the polyamic acid solution.
[0226] The above-obtained polyamic acid solution (80.0 g) was collected into a 3 L Erlenmeyer flask with a stirring bar, NMP (70.0 g), acetic anhydride (6.97 g) and pyridine (1.80 g) were ...
Synthetic example 2
[0229] Using the diamine, the tetracarboxylic acid derivative, and the organic solvent shown in the following Table 1, it carried out by the same procedure as Synthesis Example 1, respectively, and obtained the polyamic acid of the composition shown in the following Table 1. The obtained polyamic acid solution (1000.0 g) was fractionated, compound E-1 (45.32 g, 207.63 mmol) was added, and after further stirring for 12 hours, NMP, acetic anhydride and pyridine were used in the same manner as in Synthesis Example 1 to obtain A solution of polyimide (PI-A-2). In Table 1, the numerical values in parentheses indicate the compounding ratio (part by mole) of each compound with respect to 100 parts by mole of the total amount of diamines used for synthesis for the tetracarboxylic acid component, and indicate each compound for the diamine component. The compounding ratio (molar part) of a compound with respect to the total amount of diamines used for synthesis of 100 mol parts. For ...
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