Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
A technology of liquid crystal alignment agent and amine compound, which is applied in liquid crystal materials, instruments, optics, etc., and can solve problems such as poor printability for a long time
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Synthetic example A-1-1
[0143] A nitrogen inlet, a stirrer, a condenser, and a thermometer are arranged on a four-necked conical flask with a volume of 500 milliliters, and nitrogen is introduced. Then, add the diamine compound ( b-2-1), 4.05 grams (0.0375 moles) of p-phenylenediamine (b-3-1) and 80 grams of N-methyl-2-pyrrolidone (hereinafter referred to as NMP), and stirred at room temperature until dissolve. Next, 10.91 g (0.05 mol) of pyromellitic dianhydride (a-1) and 20 g of NMP were added, and reacted at room temperature for 2 hours. After the reaction, the reaction solution was poured into 1500 ml of water to precipitate the polymer, and the obtained polymer was filtered, and the steps of washing and filtering were repeated three times with methanol. Afterwards, the product was placed in a vacuum oven and dried at a temperature of 60° C. to obtain the polymer composition (A-1-1). Table 1 shows the results of evaluating the imidation rate of the obtained polymer composition (A-1-1) in the f...
Synthetic example A-2-1
[0147]A nitrogen inlet, a stirrer, a heater, a condenser tube and a thermometer are arranged on a four-neck conical flask with a capacity of 500 milliliters, and nitrogen is introduced. Then, add the diamine compound ( b-2-1), 4.05 g (0.0375 mol) of p-phenylenediamine (b-3-1) and 80 g of NMP, and stirred at room temperature until dissolved. Next, 10.91 g (0.05 mol) of pyromellitic dianhydride (a-1) and 20 g of NMP were added. After reacting at room temperature for 6 hours, 97 g of NMP, 2.55 g of acetic anhydride, and 19.75 g of pyridine were added, the temperature was raised to 60° C., and stirring was continued for 2 hours to carry out imidization reaction. After the reaction, the reaction solution was poured into 1500 ml of water to precipitate the polymer, and the obtained polymer was filtered, and the steps of washing and filtering were repeated three times with methanol. Afterwards, the product was placed in a vacuum oven and dried at a temperature of 60° C. to obtain t...
Embodiment 1
[0153] Add 100 parts by weight of polymer (A-1-1) to 1200 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as B-1) and 600 parts by weight of ethylene glycol n-butyl ether (hereinafter referred to as In B-2), at room temperature, the liquid crystal alignment agent of Example 1 can be obtained by continuously stirring with a stirring device until dissolved. The obtained liquid crystal alignment agent was evaluated by the following evaluation methods, and the results are shown in Table 3, and the detection method of long-term printability will be described later.
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