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Polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element provided therewith

A technology of polyamic acid and derivatives, applied in liquid crystal materials, instruments, optics, etc., can solve problems such as defects, display defects, afterimages, etc.

Inactive Publication Date: 2013-10-30
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubbing method has the following problems: the removal of the alignment film that occurs in the step, or the display defect caused by the adhesion of fiber dust, etc., or the thin-film transistor (Thin-Film-Transistor, TFT) element is due to the generation of static electricity. Defective display caused by damage
[0007] On the other hand, compared with the rubbing method, the photo-alignment method has poor alignment of liquid crystal molecules, so it has been pointed out that the anchoring energy is small, causing a decrease in the response speed of the liquid crystal display element or an afterimage.

Method used

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  • Polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element provided therewith
  • Polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element provided therewith
  • Polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element provided therewith

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0642] Hereinafter, although an Example demonstrates this invention, this invention is not limited to these Examples. The evaluation method of the liquid crystal display element in an Example is as follows.

[0643]

[0644] The weight average molecular weight of a polyamic acid was calculated|required by the GPC method using 2695 separation module · 2414 differential refractometers (made by Waters), and performed polystyrene conversion. The obtained polyamic acid was diluted with a phosphoric acid-dimethylformamide (DMF) mixed solution (phosphoric acid / DMF=0.6 / 100: weight ratio) so that the polyamic acid concentration became about 2 wt%. HSPgel RT MB-M (manufactured by Waters) was used as a column, and the mixed solution was used as a developing solvent, and the measurement was performed under the conditions of a column temperature of 50° C. and a flow rate of 0.40 mL / min. As the standard polystyrene, TSK standard polystyrene manufactured by Tosoh Co., Ltd. was used.

[0...

Synthetic example 1

[0661] Add 0.446 g of diamine in formula (DI-5-1) where m is 1, and 13.5 g of dehydrated NMP into a 50 mL brown four-neck flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen gas inlet port, and dry ammonia Stir to dissolve under air flow. Then, 1.054 g of acid dianhydrides (1-a) (manufactured by Nippon Seika Co., Ltd.) and dehydrated NMP5.0g were added, and stirring was continued at room temperature for 24 hours. BC5.0g was added to this reaction solution, and the polyamic-acid solution whose polymer solid content concentration was 6 wt% was obtained. Let this polyamic-acid solution be PA1. The weight average molecular weight of the polyamic acid contained in PA1 was 74,000.

[0662] [Synthesis Example 2~Synthesis Example 37]

[0663] Except for changing the tetracarboxylic dianhydride and diamine as shown in Table 1-1 and Table 1-2, prepare a polyamic acid solution (PA2)~polyamic acid with a polymer solid content concentration of 6wt% ac...

Embodiment 1

[0675] Add the mixed solvent of NMP / BC=4 / 1 (weight ratio) in the polyamic acid solution (PA1) that the polymer solid content concentration prepared in Synthetic Example 1 is 1wt%, and be diluted to the polymer solid content concentration of 4wt% to make liquid crystal alignment agent. The liquid crystal alignment agent was coated on the glass substrate using a spinner (manufactured by Mikasa Co., Ltd., spin coater (1H-DX2)). In addition, including the following examples and comparative examples, the rotational speed of the spinner was adjusted according to the viscosity of the liquid crystal alignment agent, so that the alignment film had the following film thickness. After coating, heat and dry on a heating plate (manufactured by ASONE Co., Ltd., EC heating plate (EC-1200N)) at 70°C for 80 seconds, and then dry it in a clean oven (Espec) Co., Ltd., in a clean oven (PVHC-231), heat treatment was performed at 230° C. for 15 minutes to form an alignment film with a film thickne...

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Abstract

The invention provides a polyamic acid or a derivative thereof, a liquid crystal alignment agent, a liquid crystal alignment film provided with the liquid crystal alignment agent, and a liquid crystal display element provided with the liquid crystal alignment film, wherein liquid crystal molecules are excellent in alignment property and high in transmittance. The invention provides the liquid crystal alignment agent at least comprising polyamide acid obtained through the reaction of diamine with tetracarboxylic acid bi-anhydride (represented in the formula 1) or the derivative thereof, the liquid crystal alignment film, and the liquid crystal display element provided with the liquid crystal alignment film (chemical formula 1).

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, an alignment film using the liquid crystal alignment agent, and a liquid crystal display element having the liquid crystal alignment film. The liquid crystal alignment agent contains specific alicyclic tetracarboxylic dianhydride and diamine to react The obtained polyamic acid or its derivatives. Background technique [0002] Various display devices such as personal computer monitors, liquid crystal televisions, video camera viewfinders, and projection displays, as well as optoelectronic-related components such as optical print heads, optical Fourier transform elements, and light valves, are commercialized and widely distributed today. The mainstream of the current liquid crystal display element is the display element using nematic liquid crystal. The display modes of nematic liquid crystal display elements are widely known as twisted nematic (Twisted Nematic, TN) mode and super twisted nemati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G73/12C09K19/56G02F1/1337
CPCC08G73/10C08G73/1007C08G73/106C08L79/08C09K19/56G02F1/1337
Inventor 大木洋一郎片野裕子松田智幸伊泽启介
Owner JNC CORP
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