Liquid crystal orientation agent, liquid crystal orientation film, liquid crystal orientation display element, polyamic acid and polyimide
A technology of liquid crystal alignment agent and polyamic acid, which is applied in liquid crystal materials, instruments, optics, etc., can solve the problems of high uniaxial orientation and good liquid crystal orientation, and achieve the effect of good balance and high voltage retention
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Embodiment 1
[0148]
[0149] In the solution that contains the polyamic acid (PA-1) that above-mentioned synthesis example 1 obtains, add gamma-butyrolactone (BL), N-methyl-2-pyrrolidone (NMP) and butyl cellosolve (BC), then Add 10 parts by weight of N, N, N', N'-tetraglycidyl-4,4'-diaminodiphenylmethane as an epoxy compound as a crosslinking agent (tackifier), forming a solvent ratio of BL :NMP:BC=40:40:20 (weight ratio), a solution having a solid content concentration of 4.0% by weight. After fully stirring this solution, it filtered using the filter of 1 micrometer of pore diameters, and prepared a liquid crystal aligning agent. The alignment agent at this time is regarded as "crosslinking agent", and N, N, N', N'-tetraglycidyl-4,4'-diaminodiphenyl will not be added in the preparation of the above liquid crystal alignment agent Methane acts as "no crosslinker".
[0150]
[0151] A liquid crystal cell was manufactured using this liquid crystal aligning agent, and it evaluated as fo...
Embodiment 2～12 and comparative example 1～14
[0162] Except having used the solution containing the polymer shown in said Table 1 as a polymer solution in said Example 1, the liquid crystal aligning agent was prepared similarly to Example 1, the liquid crystal cell was manufactured, and the liquid crystal orientation and voltage retention property were evaluated. The evaluation results are shown in Table 2 below.
[0163] 【Table 2】
[0164]
[0165] About the liquid crystal orientation, when there was no crosslinking agent, almost none of Examples 1-12 showed light transmission. Among them, in Examples 1, 3, 4, 8, and 10 to 12, almost no light transmission was observed in the presence of a crosslinking agent, and flow orientation caused by the addition of a crosslinking agent was hardly produced. In addition, Examples 1, 2, 5, 6, and 10 showed particularly high values for the voltage retention in the presence of a crosslinking agent.
[0166] Among them, Examples 1 and 10 in which CB was used alone as the tetracarb...
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