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Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element

A technology of liquid crystal aligning agent and photo-alignment film, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of insufficient research, purification, and unknown panel characteristics.

Inactive Publication Date: 2015-10-14
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although the improvement of the solubility of this liquid crystal aligning agent, or the improvement of orientation and electrical characteristics are also disclosed, the manufacturing method of this liquid crystal aligning agent has the disadvantage of having to purify after the reaction due to the generation of by-products (refer to patent Document 9)
[0005] On the other hand, regarding the polyamic acid-based liquid crystal aligning film, as mentioned above, the method of improving rubbing debris has been studied, but the generation of foreign matter during the operation of the touch panel has not been sufficiently studied.
In addition, the method of controlling the generation of foreign matter and maintaining various panel characteristics (especially the orientation of liquid crystal and afterimage) is still unknown

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display element

Examples

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Embodiment

[0415] Hereinafter, the present invention will be explained through examples. In addition, the evaluation methods and compounds used in the examples are as follows.

[0416] The solvents and liquid crystal compositions used in the examples are as follows.

[0417]

[0418] NMP: N-methyl-2-pyrrolidone

[0419] DMI: 1,3-Dimethyl-2-imidazolinone

[0420] GBL: γ-butyrolactone

[0421] BC: Butyl cellosolve (ethylene glycol monobutyl ether)

[0422]

[0423] Positive liquid crystal composition:

[0424]

[0425] Property value: NI 100.1℃; Δε5.1; Δn 0.093; η25.6mPa·s.

[0426] Negative liquid crystal composition:

[0427]

[0428] Property value: NI 75.7℃; Δε-4.1; Δn 0.101; η14.5mPa·s.

[0429]

[0430] 1. Weight average molecular weight (Mw)

[0431] The weight average molecular weight of the polyamic acid was measured by the GPC method using a 2695 separation module·2414 differential refractometer (manufactured by Waters) and converted into polystyrene. The obtained polyamic acid is diluted with...

Synthetic example A-1

[0446] In a 100 mL brown four-necked flask equipped with a thermometer, a stirrer, a raw material input and a nitrogen introduction port, put 0.992 g of the diamine of formula (PDI-7-1) and the formula (DI-5-1) where m is 4 1.011 g of diamine, 0.199 g of aminosilane of formula (AS-5), and 24.0 g of dehydrated NMP were stirred and dissolved under a stream of dry nitrogen. Next, 3.798 g of tetracarboxylic dianhydride in which m is 8 in formula (AN-4-17) and 20.0 g of dehydrated NMP were added, and stirring was continued at room temperature for 24 hours. 30.0 g of dehydrated NMP and 20.0 g of BC were added to this reaction solution to obtain a polyamic acid solution having a polymer solid content concentration of 6% by weight. Let this polyamic acid solution be PA-1. The weight average molecular weight of the polyamic acid contained in PA-1 was 26,300.

[0447] [Synthesis Example A-2~Synthesis Example A-30 and Synthesis Example B-1~Synthesis Example B-14]

[0448] Except for changi...

Embodiment 1

[0470] To the polyamic acid solution (PA-1) with a polymer solid content concentration of 6% by weight prepared in Synthesis Example 1, a mixed solvent of NMP / BC=77 / 20 (weight ratio) was added and diluted into a polymer The solid content concentration was 4% by weight to prepare a liquid crystal aligning agent. The liquid crystal aligning agent was applied on the glass substrate with a spinner (manufactured by MIKASA Co., Ltd., spin coater (1H-DX2)). In addition, including the following Examples and Comparative Examples, the rotation speed of the spinner was adjusted according to the viscosity of the liquid crystal aligning agent so that the alignment film had the following film thickness. After coating, it was heated and dried on a hot plate (manufactured by AS ONE Co., Ltd., EC hot plate (EC-1200N)) at 70°C for 80 seconds. Next, using Multi-Light ML-501C / B manufactured by USHIO Electric Co., Ltd., the substrate was irradiated with linearly polarized light of ultraviolet rays...

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Abstract

The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. The subject of the invention is end capped polyamide acid or liquid crystal aligning agent for optical aligning film of the derivative of the end capped polyamide acid which is obtained by reaction of Tetracarboxylic acid dianhydride, diamine compounds and amino silane compounds. The liquid crystal display element for a liquid crystal aligning film formed through the liquid crystal aligning agent for the optical aligning film can control generation of the foreign matter in the liquid crystal layer in the element to maintain orientation, aligning stableness, contrast, AC after image and other characteristics.

Description

Technical field [0001] The present invention relates to a liquid crystal aligning agent for a photo-alignment film containing a polyamic acid whose terminal is blocked or a derivative thereof, a liquid crystal aligning film obtained from the liquid crystal aligning agent for a photo-alignment film, and a liquid crystal display element. In more detail, it relates to a photo-alignment film that can control foreign matter generated in a liquid crystal display element of a lateral electric field driving method of In-Plane Switching (IPS) or Fringe Field Switching (FFS) Liquid crystal aligning agent, the liquid crystal aligning film obtained from this liquid crystal aligning agent, and a liquid crystal display element. In addition, the term "liquid crystal aligning agent" in the present invention means a polymer-containing composition for forming a liquid crystal aligning film. In addition, the liquid crystal aligning agent for photo-alignment films may be described as "photo-aligni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/1007C08G73/106C08L79/08G02F1/133723
Inventor 片野裕子大木洋一郎伊泽启介
Owner JNC CORP
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