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Method for evaluating polymer for liquid crystal directional agent and the directional agent thereof

A liquid crystal orientation and evaluation method technology, which is applied to liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of poor coating, narrowing the range of material selection, and increasing the manufacturing cost of liquid crystal panels, so as to increase production and improve pinpoints. Pore ​​defects, easy screening effect

Inactive Publication Date: 2005-10-05
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, as described in Patent Document 6 and Patent Document 7, in the design of an alignment film whose main purpose is to prevent poor coating, it is difficult to take into account the discovery of the display characteristics of the liquid crystal panel as the original purpose of the alignment film, which may be used The choice of materials is narrowed
[0006] Moreover, as described in Patent Document 8, Patent Document 9, Patent Document 10, Patent Document 11 and Patent Document 12, the bottom plate treatment through the liquid crystal panel manufacturing process increases the necessary steps, and as a result, the manufacturing cost of the liquid crystal panel is increased. Expected

Method used

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  • Method for evaluating polymer for liquid crystal directional agent and the directional agent thereof
  • Method for evaluating polymer for liquid crystal directional agent and the directional agent thereof
  • Method for evaluating polymer for liquid crystal directional agent and the directional agent thereof

Examples

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Embodiment

[0100] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples. The method of each measurement and evaluation of an Example and a comparative example was performed as follows.

[0101] [The hydrodynamic radius of the condensate (R H )]

[0102] The polymers obtained in the following Synthesis Examples 1 to 2 and Comparative Synthesis Example 1 were formulated into a solution at a predetermined concentration of 7.3% by weight, and then sufficiently stirred to obtain a uniform solution. The mixing ratio of the solvent used here was γ-butyrolactone / N-methyl-2-pyrrolidone=81.3 / 11.4 (% by weight). This resin solution was filtered through a filter (for polar solvents) with a pore diameter of 0.45 μm, washed in a methanol reflux cleaner for 2 hours or more, and placed in a quartz glass cell with a diameter of 20 mm. Since solution viscosity is temperature dependent, dynamic light scatteri...

Synthetic example 1

[0108] 219.69 g (0.98 mol) of 2,3,5-tricarboxycyclopentyl acetic acid dianhydride as tetracarboxylic dianhydride, 106.52 g (0.985 mol) of p-phenylene diamine as diamine compound, and the above formula 7.81 g (0.015 mol) of the diamine represented by (9) was dissolved in 4500 g of N-methyl-2-pyrrolidone, and it was made to react at 60 degreeC for 6 hours. Next, the reaction solution was added to a large excess of methanol to precipitate the reaction product. Then, it wash|cleaned with methanol, and dried under reduced pressure at 40 degreeC for 15 hours, and obtained 280 g of polyamic acids with the shear viscosity of 13 mPa*s of 4 weight% of solid content. 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23.4 g of pyridine and 18.1 g of acetic anhydride were added, dehydration and ring closure were carried out at 110° C. for 4 hours, and precipitation, cleaning, and reduction were carried out in the same manner as above. 17.8 g of polyimide...

Synthetic example 2

[0110] 221.93 g (0.99 mol) of 2,3,5-tricarboxycyclopentyl acetic acid dianhydride as tetracarboxylic dianhydride, 106.52 g (0.985 mol) of p-phenylenediamine as diamine compound, and the above formula 7.81 g (0.015 mol) of the diamine represented by (9) was dissolved in 4500 g of N-methyl-2-pyrrolidone, and it was made to react at 60 degreeC for 6 hours. Next, the reaction solution was added to a large excess of methanol to precipitate the reaction product. Then, it wash|cleaned with methanol, and dried under reduced pressure at 40 degreeC for 15 hours, and obtained 290 g of the polyamic acids of 4 weight% of solid content and the shear viscosity of 34 mPa*s. 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23.4 g of pyridine and 18.1 g of acetic anhydride were added, dehydration and ring closure were carried out at 110° C. for 4 hours, and precipitation, cleaning, and reduction were carried out in the same manner as above. 18.3 g of polyimi...

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Abstract

This invention provides a method for discriminating a liquid crystal alignment agent having coating defect generating possibility before the liquid crystal alignment agent is applied and to provide the liquid crystal alignment agent causing no coating defect using the same. In an evaluation method of an organic macromolecular polymer solution, printing properties when the organic macromolecular polymer solution is used as a liquid crystal alignment agent are evaluated by measuring dynamic light scattering of the organic macromolecular polymer solution and obtaining the maximum size or the position of a peak top of a flocculation body originating from an organic macromolecular polymer component from the measured dynamic light scattering. The liquid crystal alignment agent has <=20 [mu]m peak top hydrodynamic radius (RH) of the maximum peak or an average value thereof of a flocculation body originating from the organic macromolecular polymer component.

Description

technical field [0001] The present invention relates to an evaluation method of a liquid crystal aligning agent and a liquid crystal aligning agent that is less likely to cause poor coating during flexographic printing coating, evaluated using the evaluation method. Background technique [0002] Currently, a liquid crystal alignment film made of an organic polymer or the like is formed on the surface of a base plate on which a transparent conductive film is mounted, and it is used as a base plate for a liquid crystal display element. Such two base plates are placed facing each other and formed in the gap between them. A so-called TFT liquid crystal panel, in which a liquid crystal layer is obtained with a cell having a sandwich structure, and the liquid crystal display element is operated by TFT driving, is generally replacing the current cathode ray tube monitor. As a liquid crystal display element, it is known to use a nematic liquid crystal having positive dielectric anis...

Claims

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Application Information

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IPC IPC(8): G02F1/13C08G73/10G02F1/1337
CPCC08G73/10C09K19/56G02F1/133723
Inventor 小池晃广清水成夫木村慎一
Owner JSR CORPORATIOON
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