Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element
A liquid crystal alignment agent and solvent technology, applied in liquid crystal materials, instruments, optics, etc., can solve problems such as poor printing of liquid crystal display components, and achieve good storage stability and good coating properties
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Examples
Embodiment 1
[0218] In a 50ml four-neck flask with a stirring device and a nitrogen introduction tube, add 0.60g (2.0mmol) of 1,3-bis(4-aminophenylethyl)urea (BAPU) as diamine, and p-phenylenediamine 1.95 g (18.0 mmol) of (p-PDA) was added, and 30 g of N-methyl-2-pyrrolidone (NMP) was added, stirred while feeding nitrogen, and dissolved. While stirring this diamine solution, 3.70 g (18.9 mmol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) was added as tetracarboxylic dianhydride, and the solid content concentration became 12 wt. %, NMP was added and stirred at room temperature for 4 hours under a nitrogen atmosphere to obtain a polyamic acid (PA-1) solution.
[0219] In this polyamic acid solution 16.24g, add NMP9.94g and diacetone alcohol (DAA) 6.54g (NMP:DAA=60:40 (weight ratio)) as specific solvent (B), obtain polyamic acid concentration: 6.0% by weight of liquid crystal alignment agent (S1).
Embodiment 2～ Embodiment 4 and comparative example 1
[0221] Except that the type of the second solvent used to prepare the liquid crystal alignment agent is changed to the aspects described in the following Table 1, the liquid crystal alignment agent (S2) to the liquid crystal alignment agent (S4) are obtained in the same manner as in Example 1 , Liquid crystal alignment agent (R1).
Embodiment 5
[0223] CBDA19.2g (0.098mol) as tetracarboxylic dianhydride, 1,5-bis(4-aminophenoxy)pentane 24.2g (0.1mol) as diamine were dissolved in NMP343.5g, at room temperature The reaction was carried out for 10 hours. The polymerization reaction proceeded easily and uniformly, and polyamic acid (PA-2) was obtained. To the NMP solution of the polyamic acid (PA-2), 336.4 g of diacetone alcohol (DAA) (NMP:DAA=50:50 (weight ratio)) was added as a specific solvent (B) to obtain the polyamic acid concentration It is 6.0% by weight of liquid crystal alignment agent (S5).
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Abstract
Description
Claims
Application Information
- IPC
- C09K19/56; G02F1/1337; C08G73/10
- CPC
- C08G73/10; C08L79/08; C09K19/56; G02F1/133723
- Inventors
- 角谷宪一; 徳久博昭