Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
A liquid crystal alignment agent and a technology for liquid crystal alignment, which are applied in the fields of liquid crystal alignment films and liquid crystal display elements, liquid crystal display elements, and liquid crystal alignment agents, can solve the problems of poor pretilt angle uniformity, etc., and improve the problem of poor pretilt angle uniformity. Effect
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[0181] Preparation method of liquid crystal alignment agent
[0182] The preparation method of the liquid crystal alignment agent of the present invention is not particularly limited, and it can be prepared by a general mixing method. For example: the tetracarboxylic dianhydride compound (a) and the diamine compound (b) are uniformly mixed first to react to form the polymer composition (A-1). Next, add the polymer composition (A-1) into the solvent (B) at a temperature of 0°C to 200°C, and optionally add the additive (C), and continue stirring with a stirring device until dissolved. Preferably, the solvent (B) is added to the polymer composition at a temperature of 20°C to 60°C.
[0183] Preferably, at 25° C., the viscosity of the liquid crystal alignment agent of the present invention is usually 15 cps to 35 cps, preferably 17 cps to 33 cps, more preferably 20 cps to 30 cps.
[0184] Preparation method of liquid crystal alignment film
[0185] The liquid crystal alignment ...
preparation example 1
[0215] The compound represented by formula (b-1-1) (hereinafter referred to as "compound (b-1-1)", the same as formula (I-10)) was synthesized according to the following synthetic scheme 1.
[0216]
[0217] Synthesis of Compound (b-1-1a)
[0218] In a 5L three-necked flask equipped with a stirrer, a nitrogen inlet tube and a thermometer, add 389g of β-cholestanol, 201g of maleic anhydride, 15g of N,N-dimethylaminopyridine, 170ml of triethylamine and 2L of acetic acid ethyl ester. Next, reaction was performed at 90° C. for 8 hours. After the reaction, distillation under reduced pressure was performed to remove ethyl acetate. Then, 2 L of chloroform was added, and the organic layer was successively washed 3 times with dilute hydrochloric acid and 4 times with water. Thereafter, the organic layer was dried over magnesium sulfate and concentrated. Next, the generated precipitate was filtered off, and the solvent was removed to obtain 223 g of a white powder of compound (b-...
preparation example 2
[0224] The compound represented by formula (b-1-2) (hereinafter referred to as "compound (b-1-2)", the same as formula (I-11)) was synthesized according to the following synthesis scheme 2.
[0225]
[0226] (1) Synthesis of formula (b-1-2a)
[0227] In a 1L three-necked flask equipped with a dropping funnel, a thermometer, and a nitrogen inlet tube, add 117g of β-cholestanol, 3.7g of N,N-dimethylaminopyridine, 400ml of tetrahydrofuran, and 55ml of triethylamine. cool down. Here, a solution consisting of 31 ml of methanesulfonyl chloride (MsCl) and 100 ml of tetrahydrofuran added to the dropping funnel was dropped over 1 hour. Next, the reaction was carried out by stirring at room temperature for 3 hours. After the reaction was completed, 500 ml of ethyl acetate was added to the reaction mixture, and the obtained organic layer was washed with water three times, and then dried with magnesium sulfate. Then, after the organic layer was concentrated to about 300 ml, it was d...
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