Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element, phase difference film, and methods for producing these

A technology of liquid crystal alignment agent and liquid crystal alignment film, which is applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of insufficient yield rate of liquid crystal alignment film products, limit of product yield rate, insufficient tolerance, etc., and achieve liquid crystal alignment Excellent adhesion and adhesion, high product yield, and excellent afterimage characteristics

Active Publication Date: 2017-04-26
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional liquid crystal aligning films were not sufficiently resistant to such harsh environments
[0009] However, conventionally known liquid crystal aligning agents have been pointed out that printing defects such as printing unevenness and pinholes may occur at a certain rate on the coating film formed by using them, and the product yield rate at the time of liquid crystal aligning film production is insufficient.
Regarding the liquid crystal aligning agent, in order to ensure both the performance of the formed liquid crystal aligning film and the solubility of the printability, the industry has continued to study for many years, but there is still a certain limit to the product yield when the liquid crystal aligning film is manufactured.

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element, phase difference film, and methods for producing these
  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element, phase difference film, and methods for producing these
  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element, phase difference film, and methods for producing these

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0229] (1) Preparation of liquid crystal aligning agent

[0230] The polymer (PA-1) obtained in the synthesis example PA-1 is dissolved in a mixed solvent comprising N-methyl-2-pyrrolidone (NMP) and butyl cellosolve (BC) (the solvent composition is NMP; BC = 50:50 (weight ratio)) to prepare a solution having a polymer concentration of 6.0% by weight. The liquid crystal aligning agent was obtained by filtering this solution with the filter of 1 micrometer of pore diameters.

[0231] (2) Evaluation of printability

[0232] The printability of the liquid crystal aligning agent prepared above was evaluated.

[0233] First, using an offset-type liquid crystal alignment film printer (manufactured by Nippon Photo Printing Co., Ltd.), the liquid crystal alignment agent was coated on the transparent electrode surface of a glass substrate with a transparent electrode comprising an ITO film, and the After heating (pre-baking) on ​​a hot plate for 1 minute to remove the solvent, heat (...

Embodiment 2～ Embodiment 6 and comparative example 1

[0257] Except having made the kind and quantity of the polymer used for preparing a liquid crystal aligning agent into Table 2, respectively, the liquid crystal aligning agent was prepared similarly to the said Example 1, and the liquid crystal display element was manufactured and evaluated.

[0258] The evaluation results are shown in Table 2.

[0259] [Table 2] Preparation and evaluation of liquid crystal aligning agent

[0260]

[0261] Furthermore, in addition to changing the patterns of the ITO electrodes on the glass substrate as figure 2 as well as image 3 Except for the herringbone electrode pattern shown, the liquid crystal display element was manufactured similarly to the said Example 1 using the liquid crystal aligning agent in said Example 1 - Example 6, respectively, and it evaluated. Also in this case, it was confirmed that the same effects as those of Examples 1 to 6 were exhibited.

Embodiment 7

[0263] (1) Preparation of liquid crystal aligning agent

[0264] The polymer (PA-6) obtained in the synthesis example PA-6 was dissolved in a mixture containing N-methyl-2-pyrrolidone (NMP), γ-butyrolactone (GBL) and butyl cellosolve (BC). In a solvent (solvent composition: NMP:GBL:BC=40:40:20 (weight ratio)), a solution having a polymer concentration of 3.0% by weight was prepared. The liquid crystal aligning agent was obtained by filtering this solution with the filter of 1 micrometer of pore diameters.

[0265] (2) Manufacture of FFS type liquid crystal display element 1

[0266] Made as Figure 4 The FFS type liquid crystal display element shown.

[0267] Firstly, a glass substrate having an electrode pair on which a bottom electrode without a pattern, a silicon nitride film as an insulating layer, and an upper electrode patterned into a comb-like shape is sequentially formed on one side, and the opposite side without an electrode The glass substrate was used as a pair...

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Abstract

The present invention provides a liquid crystal aligning agent and a forming method thereof, a liquid crystal alignment film and a forming method thereof, a phase difference film and a manufacturing method thereof, and a liquid crystal display device and a manufacturing method thereof. The liquid crystal aligning agent contains at least one polymer selected from the group consisting of a polyamide acid obtained by reacting the tetracarboxylic dianhydride and the diamine, an imidize polymer of the polyamide acid and the esterification polymer of the polyamide acid, and the tetracarboxylic dianhydride comprises a trans-cyclopentane tetracarboxylic acid dianhydride. The liquid crystal aligning agent provides the liquid crystal alignment film which has an excellent liquid crystal aligning performance, does not cause the degradation of an electric characteristic even by radiating the light and applying the thermal stress, and also does not generate an incidental image on the condition of long time driving, and also has an excellent printing performance.

Description

technical field [0001] The invention relates to a liquid crystal aligning agent. Specifically, the present invention relates to a liquid crystal aligning agent excellent in printability in addition to providing a liquid crystal display element excellent in liquid crystal orientation, light resistance, heat resistance, and afterimage characteristics. Background technique [0002] Liquid crystal display elements can be classified into: Twisted Nematic (TN) type, Super Twisted Nematic (STN) type, Vertical Alignment (Vertical Alignment, VA) type, Multidomain Vertical Alignment (MVA) type, In-Plane Switching (IPS) type, Fringe Field Switching (FFS) type, Polymer Sustained Alignment (Polymer Sustained Alignment) , PSA) and other models. [0003] The material of the liquid crystal aligning film in these various liquid crystal display elements is known to have resin materials such as polyamic acid, polyimide, polyamide, polyester, especially the liquid crystal aligning film compri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1333G02F1/1337C08G73/10
Inventor 樫下幸志林英治
Owner JSR CORPORATIOON
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