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Liquid crystal orientating agent and liquid crystal display element

A technology of liquid crystal aligning agent and polyamic acid, which is applied in the directions of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of increasing the level difference, and achieve the effect of excellent printability and beautiful display.

Active Publication Date: 2009-09-23
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, due to the problem of electrical technology, there is a tendency that the level difference formed on the substrate will inevitably increase. The improvement of the printability of this large level difference part is becoming a new important issue for liquid crystal aligning agents.

Method used

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  • Liquid crystal orientating agent and liquid crystal display element
  • Liquid crystal orientating agent and liquid crystal display element
  • Liquid crystal orientating agent and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0135] Synthesis example 1 (synthesis of imidized polymer A1)

[0136] 135 g (0.24 mol) of the compound represented by the above-mentioned formula (B-5) as diamine, 26 g (0.24 mol) of p-phenylenediamine, and 10.5 g (0.02 mol) of cholestanyl 3,5-diaminobenzoate 125g (0.50mol) of 3,5,6-tricarboxynorbornane-2-acetic dianhydride as tetracarboxylic dianhydride was dissolved in 1200g of N-methyl-2-pyrrolidone and reacted at 60°C for 6 hours . A small amount of the obtained polyamic acid solution was taken, and N-methyl-2-pyrrolidone was added to form a solution with a polyamic acid concentration of 10% by weight. The measured solution viscosity was 65 mPa·s.

[0137] Then, 1500 g of γ-butyrolactone was added to the obtained polyamic acid solution, 80 g of pyridine and 100 g of acetic anhydride were added, and a dehydration ring-closing reaction was performed at 110° C. for 4 hours. After the dehydration ring-closure reaction, by replacing the solvent in the system with new N-methy...

Embodiment 1

[0157]

[0158] To the solution containing the imidized polymer A1 prepared in Synthesis Example 1 above, 10 parts by weight of N, N, N', N'-tetraglycidyl-4,4'-diaminodiphenylmethane is used as an epoxy compound, and N-methyl-2-pyrrolidone and butyl cellosolve are added to form a solvent composed of N- A solution of methyl-2-pyrrolidone: butyl cellosolve = 50:50 (weight ratio), and a solid content concentration of 4% by weight. This solution was filtered through a filter with a pore diameter of 1 μm to prepare a liquid crystal aligning agent.

[0159] Using this liquid crystal aligning agent, various evaluations were performed as follows.

[0160]

[0161] Using a liquid crystal alignment film printer (manufactured by Nippon Photo Printing Co., Ltd.), the liquid crystal alignment agent prepared above was coated on a transparent electrode with a strip-shaped ITO film with a thickness of 200 nm and a width of 20 μm at intervals of 100 μm. A coating film was formed on the t...

Embodiment 2～8 and comparative example 1～8

[0168] Except having shown in Table 2 respectively the polymer type and the usage-amount of an epoxy compound contained in the polymer solution used, it prepared similarly to Example 1, and evaluated the liquid crystal aligning agent. The evaluation results are listed in Table 2.

[0169] In addition, in the printability evaluation of Comparative Examples 1 to 4 in Table 2, liquid sinking occurred in all the level difference parts of the substrates, so there were parts where no coating film was formed, so the printability of each was judged as "failure". ".

[0170] Table 2

[0171]

[0172] As can be seen from the above examples, the liquid crystal aligning agent of the present invention, which comprises a polymer synthesized from a diamine containing the compound represented by the above formula (A) and the compound represented by the above formula (B), exhibits excellent printability, and the The formed liquid crystal aligning film showed favorable vertical alignment (...

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Abstract

The present invention relates to a liquid crystal orientating agent and a liquid crystal display element. The liquid crystal orientating agent has an excellent printing character even though for a substrate with a large gradation, and is capable of forming a liquid crystal orientating film capable of representing a high tilt angle stably. The liquid crystal orientating film includes at least one polymer selected from a group set composed of polyamic acid and imide polymer made by dewatering and closing loop the polyamic acid, the polyamic acid is made by a reaction of a diamine and a tetracarboxylic acid dianhydride, the diamine contains a specific compound representing by 3, 5-diamino benzenesulfoin acid cholestane group ester and a specific compound represented by a compound represented by formula (B-5).

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal display element. Background technique [0002] Currently, there is known a liquid crystal display element having a TN (twisted nematic) type or an STN (super twisted nematic) type liquid crystal cell in which polyamic acid-containing or imidized polymer is formed on the surface through a transparent conductive film. Between the two substrates of the liquid crystal alignment film, a nematic liquid crystal layer with positive dielectric anisotropy is formed to form a sandwich structure, and the long axes of the liquid crystal molecules are continuously twisted by more than 90° between the substrates. A so-called TFT liquid crystal display device in which the TN type liquid crystal display element is operated by TFT driving has been widely used in place of conventional cathode ray tubes. The alignment of liquid crystals in these liquid crystal display elements is usuall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 中田正一林英治
Owner JSR CORPORATIOON
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