Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element
A technology of liquid crystal aligning agent and photo-alignment film, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of insufficient research, purification, and unknown panel characteristics.
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[0415] Hereinafter, the present invention will be explained through examples. In addition, the evaluation methods and compounds used in the examples are as follows.
[0416] The solvents and liquid crystal compositions used in the examples are as follows.
[0417]
[0418] NMP: N-methyl-2-pyrrolidone
[0419] DMI: 1,3-Dimethyl-2-imidazolinone
[0420] GBL: γ-butyrolactone
[0421] BC: Butyl cellosolve (ethylene glycol monobutyl ether)
[0422]
[0423] Positive liquid crystal composition:
[0424]
[0425] Property value: NI 100.1℃; Δε5.1; Δn 0.093; η25.6mPa·s.
[0426] Negative liquid crystal composition:
[0427]
[0428] Property value: NI 75.7℃; Δε-4.1; Δn 0.101; η14.5mPa·s.
[0429]
[0430] 1. Weight average molecular weight (Mw)
[0431] The weight average molecular weight of the polyamic acid was measured by the GPC method using a 2695 separation module·2414 differential refractometer (manufactured by Waters) and converted into polystyrene. The obtained polyamic acid is diluted with...
Synthetic example A-1
[0446] In a 100 mL brown four-necked flask equipped with a thermometer, a stirrer, a raw material input and a nitrogen introduction port, put 0.992 g of the diamine of formula (PDI-7-1) and the formula (DI-5-1) where m is 4 1.011 g of diamine, 0.199 g of aminosilane of formula (AS-5), and 24.0 g of dehydrated NMP were stirred and dissolved under a stream of dry nitrogen. Next, 3.798 g of tetracarboxylic dianhydride in which m is 8 in formula (AN-4-17) and 20.0 g of dehydrated NMP were added, and stirring was continued at room temperature for 24 hours. 30.0 g of dehydrated NMP and 20.0 g of BC were added to this reaction solution to obtain a polyamic acid solution having a polymer solid content concentration of 6% by weight. Let this polyamic acid solution be PA-1. The weight average molecular weight of the polyamic acid contained in PA-1 was 26,300.
[0447] [Synthesis Example A-2~Synthesis Example A-30 and Synthesis Example B-1~Synthesis Example B-14]
[0448] Except for changi...
Embodiment 1
[0470] To the polyamic acid solution (PA-1) with a polymer solid content concentration of 6% by weight prepared in Synthesis Example 1, a mixed solvent of NMP / BC=77 / 20 (weight ratio) was added and diluted into a polymer The solid content concentration was 4% by weight to prepare a liquid crystal aligning agent. The liquid crystal aligning agent was applied on the glass substrate with a spinner (manufactured by MIKASA Co., Ltd., spin coater (1H-DX2)). In addition, including the following Examples and Comparative Examples, the rotation speed of the spinner was adjusted according to the viscosity of the liquid crystal aligning agent so that the alignment film had the following film thickness. After coating, it was heated and dried on a hot plate (manufactured by AS ONE Co., Ltd., EC hot plate (EC-1200N)) at 70°C for 80 seconds. Next, using Multi-Light ML-501C / B manufactured by USHIO Electric Co., Ltd., the substrate was irradiated with linearly polarized light of ultraviolet rays...
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