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

A composition and optically active technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of dust production, inability to realize liquid crystal orientation, and static electricity generation.

Active Publication Date: 2020-11-17
NISSAN CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the brushing method of rubbing the surface of a liquid crystal alignment film made of polyimide or the like has problems of generating dust and static electricity.
In addition, due to the high-definition of liquid crystal display elements in recent years, the unevenness caused by the electrodes on the corresponding substrate or the switching active elements for liquid crystal driving, it is sometimes impossible to rub the surface of the liquid crystal alignment film evenly with a cloth, and it is impossible to achieve uniformity. Liquid crystal orientation

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0176] The abbreviations used in the examples are as follows.

[0177] (methacrylic monomer)

[0178]

[0179] (bipyridyl additive)

[0180]

[0181] (Organic solvents)

[0182] THF: Tetrahydrofuran

[0183] NMP: N-methyl-2-pyrrolidone

[0184] BC: Butyl cellosolve

[0185] (polymerization initiator)

[0186] AIBN: 2,2'-azobisisobutyronitrile

[0187] The conditions for measuring the molecular weight of the polymer are as follows.

[0188] Apparatus: Normal temperature gel permeation chromatography (GPC) apparatus (SSC-7200) manufactured by Senshu Science Co., Ltd.

[0189] Column: column manufactured by Shodex (KD-803, KD-805)

[0190] Column temperature: 50°C

[0191] Eluent: N,N'-dimethylformamide (as an additive, lithium bromide monohydrate (LiBr·H 2 O) is 30mmol / L, phosphoric acid anhydrous crystal (orthophosphoric acid) is 30mmol / L, tetrahydrofuran (THF) is 10ml / L)

[0192] Flow rate: 1.0ml / min

[0193] Standard samples for calibration curve preparation...

Embodiment 2

[0202]M6BA (15.32 g, 50.0 mmol) was dissolved in THF (141.6 g), and after degassing with a diaphragm pump, AIBN (0.411 g, 2.5 mmol) was added and degassed again. Then, it was made to react at 60 degreeC for 30 hours, and the polymer solution of the methacrylate was obtained. This polymer solution was added dropwise to diethyl ether (1500 ml), and the resulting precipitate was filtered. This deposit was wash|cleaned with diethyl ether, it dried under reduced pressure in 40 degreeC oven, and obtained the methacrylate polymer powder (B). The polymer had a number average molecular weight of 13,000 and a weight average molecular weight of 31,000.

[0203] NMP (29.29g) was added to the obtained methacrylate polymer powder (B) (6.0g), and it stirred and melt|dissolved at room temperature for 5 hours. NMP (14.75g) and BC (50.0g) were added to this solution, it stirred for 5 hours, and obtained the liquid crystal aligning agent (B1).

[0204] Moreover, 0.03 g (5 mass % with respect ...

Embodiment 3

[0206] A liquid crystal cell was produced using the liquid crystal aligning agent (A2) obtained in Example 1, and the orientation of a low molecular liquid crystal was confirmed. The irradiation amount of polarized UV in the orientation treatment and the conditions of the heating temperature after the polarized UV irradiation were changed, and the conditions for obtaining the optimum orientation were confirmed.

[0207] [Production of liquid crystal unit]

[0208] The substrate was a glass substrate with a size of 30 mm×40 mm and a thickness of 0.7 mm, and a substrate on which comb-shaped pixel electrodes formed by patterning an ITO film were arranged was used. The pixel electrode has a comb-tooth shape formed by arranging a plurality of "2 After irradiating the coating film surface with ultraviolet rays of 313 nm, it was heated for 10 minutes with a 140-170 degreeC hotplate, and the board|substrate with a liquid crystal aligning film was obtained. In addition, as a counter s...

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Abstract

This invention provides the liquid crystal aligning film and the liquid crystal aligning agent for which orientation control ability is provided efficiently, and the range of the optimum polarized ultraviolet-ray irradiation amount is wide. According to the present invention, the optically active composition is characterized in that it contains the following (A) component and (B) component, and either or both of the side chain of the (A) component and the (B) component contain a photoreactive group. Group, (A) component and (B) component form liquid crystal supermolecule through hydrogen bond: (A) possesses the polymer of the side chain that contains carboxylic acid group structure; And (B) is selected from following formula (1) and at least one compound among the compounds represented by the formula (2) [the definitions of the symbols in the formula are as described in the specification]. Py‑X‑Py(1)Py‑S‑X‑S‑Py(2)

Description

technical field [0001] The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element using the same, and is suitable for manufacturing a polymer film for optical elements such as a phase difference film and a polarized light diffraction element to control molecular orientation. Background technique [0002] It is known that liquid crystal display elements are light in weight, thin in cross-section, and low in power consumption, and have achieved remarkable development in recent years, such as being used for large-scale television applications. The liquid crystal display element is constituted by sandwiching a liquid crystal layer between a pair of transparent substrates provided with electrodes, for example. Also, in a liquid crystal display element, an organic film containing an organic material is used as a liquid crystal alignment film to make liquid crystals exhibit a desired alignment state between substrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/08C08F8/00C08F20/30C08K5/3432C08K5/378C08L33/10G02F1/1337
CPCC08F20/30C08F8/00C08K5/3432C08K5/378C08L33/10C08L101/08G02F1/1337C09K19/56C08K5/43C08F2/46
Inventor 南悟志芦泽亮一川月喜弘近藤瑞穂
Owner NISSAN CHEM CORP