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Liquid crystal alignment agent and liquid crystal display element

A technology of liquid crystal display element and liquid crystal aligning agent, which is applied in the direction of liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of increased 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 alignment agent and liquid crystal display element
  • Liquid crystal alignment agent and liquid crystal display element
  • Liquid crystal alignment agent and liquid crystal display element

Examples

Experimental program
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Effect test

Synthetic example 1

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

[0136] 125 g (0.50 moles) of 3,5,6-tricarboxy-2-carboxymethylnorbornane-2:3,5:6-dianhydride as tetracarboxylic dianhydride, p-phenylenediamine as diamine 53 g (0.49 mol) and 5.2 g (0.01 mol) of cholestanyl 3,5-diaminobenzoate were dissolved in 830 g of N-methyl-2-pyrrolidone and reacted at 60° C. for 6 hours. Take a small amount of the obtained polyamic acid solution and add N-methyl-2-pyrrolidone to form a solution with a polyamic acid concentration of 10% by weight. The measured solution viscosity is 50 mPa·s.

[0137] Then, 1900 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-closure reaction was performed at 110° C. for 4 hours. After the dehydration ring-closure reaction, the solvent in the system is replaced with new N-methyl-2-pyrrolidone (by this solvent replacement operation, the pyridine and aceti...

Synthetic example 2

[0138] Synthesis example 2 (synthesis of polyamic acid (A-2))

[0139] 188 g (0.75 moles) of 3,5,6-tricarboxy-2-carboxymethylnorbornane-2:3,5:6-dianhydride as tetracarboxylic dianhydride and 1,2,3,4- Cyclobutanetetracarboxylic dianhydride 49g (0.25 mole), as diamine 4,4'-diaminodiphenyl ether 190g (0.95 mole) and 3,5-diaminobenzoic acid cholestenyl ester 26g ( 0.05 mole) was dissolved in the mixed solvent that is made up of 410g N-methyl-2-pyrrolidone and 3730g gamma-butyrolactone, reacted 4 hours at 40 ℃, obtain about 4500g containing 10% by weight polyamic acid (A-2) The solution. The solution viscosity of this polyamic acid solution was 43 mPa·s.

Synthetic example 3

[0140] Synthesis example 3 (synthesis of imidized polymer (A-3))

[0141] 25 g (0.1 mol) of 3,5,6-tricarboxy-2-carboxymethylnorbornane-2:3,5:6-dianhydride as tetracarboxylic dianhydride and 2,3,5-tricarboxy Cyclopentyl acetic acid dianhydride 90g (0.4 mole), as diamine p-phenylenediamine 43g (0.40 mole) and 1-cholestalkoxy-2,4-diaminobenzene 49g (0.10 mole) is dissolved in 830g N -Methyl-2-pyrrolidone was reacted at 60° C. for 6 hours. Take a small amount of the obtained polyamic acid solution and add N-methyl-2-pyrrolidone to form a solution with a polyamic acid concentration of 10% by weight. The measured solution viscosity is 55 mPa·s.

[0142] Then, 1900 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 40 g of pyridine and 51 g of acetic anhydride were added, and a dehydration ring-closing reaction was performed at 110° C. for 4 hours. After the dehydration ring-closing reaction, the solvent in the system is replaced by a new N-methyl-2-p...

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Abstract

The invention relates to a liquid crystal alignment agent and a liquid crystal display element. The liquid crystal alignment agent has good printability even to a base plate with big gradient and can form a liquid crystal alignment film which can stably embody high tilt angle. The liquid crystal alignment agent comprises at least a polymer selected from the following group which is composed of polyamic acid and imide polymers made by dehydrating the polyamic acid and closing ring of the polyamic acid. The polyamic acid is made by reacting diamine containing special compounds with 3,5-diaminobenzylacid cholestalkyl ester as a representative and tetracarboxylicdianhydride containing 3,5,6-tricarboxyl-2-carboxymethyl norbornane-2:3,5:6-dianhydride.

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 STN (super twisted nematic) type liquid crystal cell in which a polyamic acid or imide polymer-containing liquid crystal is formed on the surface through a transparent conductive film. Between the two substrates of the liquid crystal alignment film, a layer of nematic liquid crystal with positive dielectric anisotropy is formed to form a sandwich structure. 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...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 中田正一林英治
Owner JSR CORPORATIOON
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