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Liquid crystal aligning agent, liquid crystal alignment film produced using same, and liquid crystal display element

A technology of liquid crystal alignment agent and polyol compound, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of rough surface of coating film, poor adhesion, whitening of varnish, etc., and achieve improved solubility, improved adhesion, Effect of gap uneven suppression

Active Publication Date: 2013-01-02
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, if a liquid crystal aligning agent containing polyimide is used, when printing on a substrate, the polyimide will precipitate due to moisture absorption, and the varnish will whiten, causing the resulting coating film to have a rough surface.
[0007] Furthermore, in the case of a liquid crystal aligning agent containing polyimide, the adhesion between polyimide and printing plates such as APR (Asahi Photosensitive Resin) is poor, and the coating film will be removed from the printing plate during the printing process. Peeling, since it is transferred to the substrate in this state, it is easy to cause the problem that the peeled polyimide remains on the substrate as foreign matter, and it aggregates to cause gap unevenness

Method used

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  • Liquid crystal aligning agent, liquid crystal alignment film produced using same, and liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal alignment film produced using same, and liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal alignment film produced using same, and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] With 13.53g (0.069mol) A-1, 6.54g (0.030mol) A-2 as tetracarboxylic dianhydride components, with 6.10g (0.030mol) B-1, 4.89g (0.040mol) B-2, 9.62 As a diamine component, g (0.030 mol) of B-4 was reacted at room temperature in 162.7 g of NMP for 24 hours to obtain a polyamic acid solution.

[0171] 255.64 g of NMP was added and diluted to 142.8 g of this polyamic acid solution, 20.64 g of acetic anhydride and 8.8 g of pyridine were added, and it was made to react at the temperature of 50 degreeC for 3 hours and imidate.

[0172] After cooling this reaction solution to about room temperature, it poured into 1498.8 ml of methanol, and the precipitated solid substance was recovered. Next, after wash|cleaning this solid substance several times with methanol, it dried under reduced pressure at the temperature of 100 degreeC, and obtained the white powder of polyimide (SPI-1). The polyimide had a number average molecular weight of 13653 and a weight average molecular weight o...

Embodiment 2

[0175] 65 g of NMP was added to 5 g of polyimide SPI-1 powder to dissolve it completely, then 30 g of BS was added, and stirred at a temperature of 50° C. for 24 hours. The polyimide was completely dissolved at the end of stirring. After cooling this back to room temperature, 0.25 g of compound-1 was added and stirred for 3 hours to obtain a liquid crystal aligning agent.

Embodiment 3

[0177] 65g of NEP was added to 5g of polyimide SPI-1 powder to dissolve it completely, then 30g of BS was added, and stirred at a temperature of 50°C for 24 hours. The polyimide was completely dissolved at the end of stirring. After cooling this back to room temperature, 0.25 g of compound-1 was added and stirred for 3 hours to obtain a liquid crystal aligning agent.

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PUM

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Abstract

Disclosed is a liquid crystal aligning agent which can prevent the occurrence of a whitening phenomenon and a phenomenon of generating a foreign matter on a substrate, enables the production of a liquid crystal alignment film prevented from the reduction in a pretilt angle, and has a good aligning property. Specifically disclosed are: a liquid crystal aligning agent which is characterized by comprising a polyimide that is produced by imidizing a polyamic acid produced by reacting a diamine component with a tetracarboxylic acid dianhydride and a polyol compound that has a tertiary nitrogen atom and a quaternary carbon atom and contains 3 to 15 carbon atoms; a liquid crystal alignment film produced using the composition; and a liquid crystal display element.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent that suppresses whitening and generation of foreign matter without reducing a pretilt angle, and relates to a liquid crystal aligning film and a liquid crystal display element using the liquid crystal aligning agent. Background technique [0002] A liquid crystal display element is a display element in which liquid crystal molecules are sandwiched between liquid crystal alignment films formed on a substrate, and liquid crystal molecules aligned in a certain direction through the liquid crystal alignment film utilize a response by voltage. Usually, the liquid crystal aligning agent (it is also called a liquid crystal aligning agent) which forms the polyimide film which has high reliability is used for this liquid crystal aligning film. [0003] As a method of forming a polyimide film on a substrate with electrodes, there is a method of preparing a coating film of a liquid crystal aligning ...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/10
CPCC08L79/08G02F1/133723C08G73/10C08K5/17
Inventor 松本欣也后藤耕平裴鸿基筒井皇晶
Owner NISSAN CHEM IND LTD
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