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Polymer and liquid crystal alignment agent using same

A technology of polymer and polyimide, applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of lack of uniform liquid crystal alignment film, polymer precipitation, poor substrate coating, etc.

Active Publication Date: 2019-11-19
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the liquid crystal aligning agent is stored at low temperature, there is a problem of polymer precipitation.
In addition, the coatability to the substrate is poor, and a uniform liquid crystal aligning film cannot be obtained, and as a result, there is also a problem that it adversely affects the characteristics of the liquid crystal display element.

Method used

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  • Polymer and liquid crystal alignment agent using same
  • Polymer and liquid crystal alignment agent using same
  • Polymer and liquid crystal alignment agent using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] BODA (2.50g, 10mmol), PCH7DAB (3.81g, 10mmol), 3-AMPDA (4.85g, 20mmol), p-PDA (2.16g, 20mmol) in NMP (75.46g) After mixing at 80° C. for 5 hours, CBDA (7.75 g, 39.5 mmol) and NMP (8.79 g) were added and reacted at 40° C. for 6 hours to obtain a polyamic acid solution.

[0160] After adding NMP to this polyamic acid solution (20.0 g) so that the content of the polyamic acid was diluted to 10% by mass, acetic anhydride (2.42 g) and pyridine (0.62 g) were added as an imidization catalyst, and 60 °C for 3.5 hours. This reaction solution was poured into methanol (300 ml), and the obtained precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 100° C. to obtain a polyimide powder. The imidization rate of this polyimide was 75%, the number average molecular weight was 9651, and the weight average molecular weight was 23793.

[0161] The obtained polyimide powder was reprecipitated in methanol, and it stirred at 60 degreeC fo...

Embodiment 2

[0163] The polyimide powder obtained in Example 1 was reprecipitated in methanol, and stirred at 60° C. for 40 hours. The precipitate was obtained by filtration, and dried under reduced pressure at 100° C. to obtain a specific polymer powder. The imidization rate of this specific polymer was 27%, the esterification rate was 48%, the amide rate was 25%, the number average molecular weight was 9171, and the weight average molecular weight was 24207.

Embodiment 3

[0165]The polyimide powder obtained in Example 1 was reprecipitated in methanol, and stirred at 60° C. for 70 hours. The precipitate was obtained by filtration, and dried under reduced pressure at 100° C. to obtain a specific polymer powder. The imidization rate of this specific polymer was 19%, the esterification rate was 56%, the amide rate was 25%, the number average molecular weight was 8366, and the weight average molecular weight was 20488.

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Abstract

The present invention provides a polymer which is highly soluble in organic solvents so that various solvents can be selected therefor and from which a filmy substance having excellent characteristicsas a liquid crystal alignment agent, etc. can be obtained. The polymer comprises a repeating unit of a polyamic acid ester, a repeating unit of a polyimide and a repeating unit of a polyamic acid andhas a basic group in any of the repeating units. [In formulae: X1 to X3 independently represent a tetravalent organic group derived from a tetracarboxylic acid; Y1 to Y3 independently represent a divalent organic group derived from a diamine, provided that at least one of Y to Y3 has a basic group; and R1 represents an alkyl group having 1-5 carbon atoms.]

Description

technical field [0001] This invention relates to the novel polymer suitable for a liquid crystal aligning agent, and the liquid crystal aligning agent using it, for example. Background technique [0002] In liquid crystal display elements used in liquid crystal televisions, liquid crystal displays, etc., a liquid crystal aligning film for controlling the alignment state of liquid crystals is generally provided in the element. [0003] At present, in the liquid crystal aligning film most popular in industry, at least one polymer selected from the group consisting of polyamic acid, polyamic acid ester, and polyimide is used from the viewpoints of its high reliability and liquid crystal orientation. [0004] A liquid crystal aligning film can be formed by apply|coating and baking the liquid crystal aligning agent which melt|dissolved the said polymer in an organic solvent on a board|substrate. [0005] However, there are few solvents that sufficiently dissolve these polymers. ...

Claims

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Application Information

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IPC IPC(8): C08G73/10G02F1/1337
CPCC08G73/10C08G73/16C08L79/08G02F1/133723
Inventor 矢田研造须贺贵裕
Owner NISSAN CHEM IND LTD
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