Liquid crystal directing agent, and production method of liquid crystal oriented film formed by same
A technology of liquid crystal alignment and alignment agent, which is applied in the field of manufacture of liquid crystal alignment agent and its formed liquid crystal alignment film
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Synthetic example 1
[0137] A nitrogen inlet, stirrer, heater, condenser and thermometer are arranged on a four-necked conical flask with a volume of 500 milliliters, and nitrogen is introduced and the feed composition is added in the amount shown in Table 1. The above feed composition includes: 1 - Octadecyloxy-2,4-diaminobenzene (hereinafter referred to as C18DA) 3.76g (0.01mole), and solvent tetrahydrofuran (hereinafter referred to as THF) 50g, stirred at room temperature until dissolved. Then add 2.45 g (0.025 mole) of maleic anhydride (hereinafter referred to as MAn) and react at room temperature for 3 hours. After the reaction, the reaction solution is filtered, and the filtered solid is repeatedly washed and filtered with THF three times, and placed in a vacuum After drying in an oven at a temperature of 60° C., the compound (A-1-1) containing two maleamic acid groups can be obtained.
Synthetic example 2～4
[0139] The operation method is the same as in Synthesis Example 1, except that the type of polyamine-based compound and the amount of maleic anhydride are changed. The detailed information is shown in Table 1.
[0140] [Examples and Comparative Examples of Liquid Crystal Aligning Agents]
Embodiment 1
[0142] 100 parts by weight of the compound (A-1-1) of the maleamic acid group obtained in Synthesis Example 1 is dissolved in 1200 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as NMP) / ethylene glycol n-butyl ether (hereinafter referred to as BC) in 300 parts by weight of co-solvent, completely dissolved at room temperature, and the resulting alignment agent solution was coated on a glass substrate with an ITO (indium-tin-oxide) film with a spin coater. Then pre-bake at 80° C. for 2 minutes on a heating plate, and post-bake at 235° C. for 15 minutes in a circulating oven. Measure the film thickness with a film thickness tester (manufactured by KLA-Tencor, model Alpha-step 500) to about 750 For the two liquid crystal alignment film glass substrates prepared by the above steps, one glass substrate is coated with hot pressing glue, and the other glass substrate is sprinkled with a 4 μm spacer, and the two glass substrates are laminated. After the nematic li...
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