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Liquid crystal aligning agent for photoalignment and liquid crystal display device utilizing the same

A technology of liquid crystal alignment agent and optical alignment, which is applied in liquid crystal materials, optics, nonlinear optics, etc. It can solve the problems that the electrical characteristics do not propose the structure of the liquid crystal alignment film, and the selection of alignment film materials is not too many, so as to achieve good voltage retention characteristics. , It is not easy to display unevenness, and the effect of accumulating less charge

Active Publication Date: 2008-11-26
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, compared with the liquid crystal alignment film using the rubbing treatment, the choice of alignment film material is not much.
Especially for the alignment film of the polyimide material that is currently used as the liquid crystal alignment film that adopts the rubbing treatment to have practical effects, there is no structure suitable for the liquid crystal alignment film that adopts the photo-alignment method from the perspective of electrical characteristics.

Method used

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  • Liquid crystal aligning agent for photoalignment and liquid crystal display device utilizing the same
  • Liquid crystal aligning agent for photoalignment and liquid crystal display device utilizing the same
  • Liquid crystal aligning agent for photoalignment and liquid crystal display device utilizing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0078] Explanation of abbreviations used in this example

[0079] (tetracarboxylic dianhydride)

[0080] CBDA: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0081] 1,3DM-CBDA: 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride (diamine)

[0082] 4,4'DADPA: 4,4'-Diaminodiphenylamine

[0083] p-PDA: p-phenylenediamine

[0084] DDE: 4,4'-diaminodiphenyl ether

[0085] (Organic solvents)

[0086] NMP: N-methyl-2-pyrrolidone

[0087] BCS: Butyl Cellosolve

Synthetic example 1

[0088] (Synthesis Example 1) CBDA / 4,4'DADPA

[0089] Mix 19.61 g (0.1 mol) of CBDA as a tetracarboxylic dianhydride component and 19.13 g (0.096 mol) of 4,4'DADPA as a diamine component in 348.6 g of NMP, and react at room temperature for 5 hours to obtain a polyamide acid solution A. The polymerization reaction proceeded easily and uniformly, and when the weight average molecular weight of the obtained polyamic acid was measured with GPC-101 (manufactured by Shodex), it was 50000 (in terms of polyethylene glycol and polyethylene oxide). Further, NMP and BCS were added to make the solution 4% by weight of polyamic acid, 76% by weight of NMP, and 20% by weight of BCS, thereby obtaining the liquid crystal aligning agent of the present invention.

Synthetic example 2

[0090] (Synthesis Example 2) CBDA / 4,4'DADPA, CBDA / p-PDA

[0091] Mix 19.61g (0.1mol) of CBDA as a tetracarboxylic dianhydride component and 10.38g (0.096mol) of p-PDA as a diamine component in 269.9g of NMP, and react at room temperature for 5 hours to obtain a polyamic acid solution b. The polymerization reaction proceeded easily and uniformly, and it was 47,000 when the weight average molecular weight of the obtained polyamic acid was measured in the same manner as in Synthesis Example 1. The polyamic acid solution A and polyamic acid solution B obtained in Synthesis Example 1 were mixed at a solid content ratio of 1:1 to obtain a uniform solution. Further, NMP and BCS were added to make the solution 4% by weight of polyamic acid, 76% by weight of NMP, and 20% by weight of BCS, thereby obtaining the liquid crystal aligning agent of the present invention.

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Abstract

A liquid crystal aligning agent for obtaining a liquid crystal alignment film excelling in not only liquid crystal alignment performance but also electrical properties through photoalignment procedure; and a liquid crystal display device making use of this liquid crystal aligning agent, which can resolve problems invited by rubbing treatment of liquid crystal alignment film, exhibiting high reliability and which can minimize display unevenness and exudation around sealing material. There is provided a liquid crystal aligning agent for photoalignment, characterized by containing at least one of a polyamic acid, the polyamic acid obtained by reacting a diamine component containing a diamine of the following formula (1) with a tetracarboxylic acid dianhydride component containing a tetracarboxylic acid dianhydride with alicyclic structure into a polymer, and a polyimide obtained from the polyamic acid. There is further provided a liquid crystal display device having a liquid crystal alignment film obtained from the above liquid crystal aligning agent through photoalignment procedure. (wherein two of R<1> to R<10> are primary amino, and each of the rest is a hydrogen atom or a monovalent organic group other than primary amino, provided that they may be identical with or different from each other).

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent for photo-alignment for forming a liquid crystal aligning film by a photo-alignment method, and a liquid crystal display element using the same. Background technique [0002] Liquid crystal display elements are currently widely used as thin and lightweight display devices. It is known that the display characteristics of a liquid crystal display element are largely influenced by the orientation of liquid crystals, the size of a pretilt angle of liquid crystals, the stability of a pretilt angle, electrical characteristics, and the like. In order to improve the display characteristics of such a liquid crystal display element, not only the liquid crystal material to be used but also a liquid crystal aligning film that directly contacts the liquid crystal and determines its orientation state is important. [0003] At present, the resin solution of polyamic acid or polyimide is mainly used as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCG02F1/1337C08G73/10C09K19/56
Inventor 筒井皇晶军司里枝酒井隆宏
Owner NISSAN CHEM IND LTD
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