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

A liquid crystal alignment film and a technology of liquid crystal alignment, applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of poor residual charge characteristics, achieve excellent coating uniformity, less accumulated charge, and suppress whitening and aggregation.

Active Publication Date: 2016-08-31
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, such a liquid crystal aligning film composed only of soluble polyimide has poor residual charge characteristics.

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0458] Mix A-2 (48.9g, 19.5mmol), B-1 (31.0g, 6.89mmol), B-3 (17.4g, 16.0mmol) in NMP (290g) and make it react at 40°C After 5 hours, A-1 (5.77g, 2.94 mmol) and NMP (120g) were added, it was made to react at 40 degreeC for 15 hours, and the solution (concentration 20.0 mass %) of a polyamic acid was obtained. The polyamic acid had a number average molecular weight of 11,700 and a weight average molecular weight of 40,600.

[0459] After adding NMP to the solution (485 g) of this polyamic acid and diluting to 6 mass %, acetic anhydride (66.2 g) and pyridine (34.2 g) were added as an imidization catalyst, and it was made to react at 100 degreeC for 2.5 hours. This reaction solution was poured into methanol (6010 g), and the generated precipitate was separated by filtration. This deposit was washed with methanol, and dried under reduced pressure at 100°C to obtain a polyimide powder (corresponding to the specific polymer (A)). The imidization rate of this polyimide was 60%, the...

Embodiment 2

[0462] A-2 (236g, 94.0 mmol), B-2 (84.5g, 22.2 mmol), B-4 (53.7g, 22.1 mmol), B-5 ​​(101g, 66.3 mmol) in NMP (1510g ) and allowed to react at 80°C for 5 hours, A-1 (30.4g, 15.5mmol) and NMP (506g) were added and reacted at 40°C for 15 hours to obtain a solution of polyamic acid (concentration 20.0 quality%). The polyamic acid had a number average molecular weight of 12600 and a weight average molecular weight of 61400.

[0463] After adding NMP to the solution (600g) of this polyamic acid and diluting to 6 mass %, acetic anhydride (268g) and pyridine (41.6g) were added as an imidization catalyst, and it was made to react at 100 degreeC for 4 hours. This reaction solution was poured into methanol (8080 g), and the generated precipitate was separated by filtration. This deposit was wash|cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the powder (corresponding to the specific polymer (B)) of a polyimide. The imidization rate of this poly...

Embodiment 3

[0466] By the polyimide solution (A) obtained by embodiment 1 and the polyimide solution (B) obtained by embodiment 2 according to polyimide solution (A) and polyimide solution (B) with mass % The conditions calculated as 20:80 were mixed at room temperature, and D-1 was further added at 3% by mass relative to the polyimide, stirred, and pressure-filtered with a membrane filter with a pore diameter of 1 μm to obtain Example 3. Liquid crystal aligning agent.

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Abstract

Provided is a liquid crystal orientation treatment agent comprising the following specific polymer (A), specific polymer (B) and specific crosslinkable compound (C). Specific polymer (A) is at least one polymer selected from the group consisting of polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials. Specific polymer (B) is at least one polymer selected from polyimide and polyimide precursors wherein a diamine compound having a side chain represented by formula [1] is used in a portion of the starting materials and the ratio of the diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials is smaller than the ratio of diamine compound having a side chain represented by formula [1] in the total diamine component of the starting materials of specific polymer (A). Specific crosslinkable compound (C) is a crosslinkable compound having two or more crosslinking groups selected from epoxy groups, and the like. (In formula [1], X1 is a single bond or a bonding group such as -O-, X2 is a single bond or -(CH2)b- (where b is an integer between 1 and 15), X3 is a single bond or a bonding group such as -O-, X4 is a divalent cyclic group selected from a benzene ring and the like, X5 is a divalent cyclic group selected from a benzene ring, and the like, n is an integer between 0 and 4, and X6 is a C1-18 alkyl group, and the like.)

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used when producing a liquid crystal aligning film, and the liquid crystal aligning film and liquid crystal display element using this liquid crystal aligning agent. Background technique [0002] Liquid crystal display elements used in liquid crystal televisions, liquid crystal displays, and the like are widely used as thin and lightweight display devices. As a liquid crystal aligning film for aligning liquid crystals, a so-called polyimide-based liquid crystal aligning film is mainly used. This liquid crystal aligning film is coated with polyamic acid (also called polyamic acid (polyamic acid)) on a glass substrate or the like. A liquid crystal aligning agent such as a polyimide precursor or a solution of a soluble polyimide is obtained by firing as a main component. [0003] With the further enlargement and high-definition of liquid crystal display elements, considering the requirements of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08L79/08
CPCC08L79/08G02F1/133711
Inventor 巴幸司菊池奈穗片山雅章后藤耕平
Owner NISSAN CHEM IND LTD
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