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

A liquid crystal alignment agent and liquid crystal alignment technology, applied in liquid crystal materials, instruments, optics, etc., can solve problems such as unsatisfactory and deterioration, and achieve rigidity improvement, low voltage retention rate reduction, and high voltage retention rate. Effect

Inactive Publication Date: 2013-01-09
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] As a liquid crystal display element, considering its use form, it is not satisfactory to show high display quality (voltage retention) only in a temporary high-temperature environment, and it is also required to display a stable display for a long time in a high-temperature environment. Display quality, and less degradation due to heat
However, in the liquid crystal alignment agent of the above-mentioned Patent Document 1, although the voltage retention rate in a temporary high-temperature environment has been studied, it cannot necessarily be said that a high display quality can be stably exhibited even due to a long-term thermal stress.

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

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Embodiment

[0155] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited by these examples.

[0156] Polymer Synthesis

[0157] Synthesis Example 1 to Synthesis Example 4 and Comparative Synthesis Example 1 to Comparative Synthesis Example 3

[0158] To N-methyl-2-pyrrolidone, diamine and tetracarboxylic dianhydride of the types and proportions shown in the following Table 1 were sequentially added to prepare a solution with a monomer concentration of 15 wt%. Thereafter, the reaction was carried out at room temperature for 6 hours to obtain polyamic acid (PA-1) ~ polyamic acid (PA-4) and polyamic acid (PAR-1) ~ polyamic acid (PAR-3) respectively. The solution. A small amount of each solution was collected, and N-methyl-2-pyrrolidone was added to prepare a solution with a polyamic acid concentration of 10 wt%. The results of measuring the viscosity of this solution are shown in Table 1 below. In addition, the...

example 1

[0175] Add gamma-butyrolactone (BL), N-methyl-2-pyrrolidone (NMP) and butyl cellosolve (BC) to the solution containing the polyamic acid (PA-1) obtained in the above synthesis example 1, further Adding 10 parts by weight of N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane as an epoxy compound with respect to a total of 100 parts by weight of the polymer Stir to prepare a solution with a solvent ratio of BL:NMP:BC=40:40:20 (weight ratio) and a solids concentration of 4.0 wt%.

[0176]This solution was filtered using a filter with a pore size of 1 μm. The solution thus obtained was used as a liquid crystal alignment agent (S-1).

example 2～ example 4 and comparative example 1～ comparative example 3

[0178] The polyamic acid used was changed to (PA-2)~(PA-4) or (PAR-1)~(PAR-3), and the liquid crystal aligning agent was prepared by using the same method as the above-mentioned example 1 ( S-2) ~ liquid crystal alignment agent (S-4) and liquid crystal alignment agent (SR-1) ~ liquid crystal alignment agent (SR-3).

[0179] Manufacture of liquid crystal display elements

[0180] Example 1

[0181] On a glass substrate with a thickness of 1 mm having a chromium electrode (the chromium electrode is set as a comb shape) on one side, the liquid crystal alignment agent (S-1) of Example 1 prepared above is coated with a spinner, and the After prebaking for 1 minute on a heating plate at 80°C, perform post-baking on a heating plate at 230°C for 10 minutes to form a film with a thickness of about coating film. Using a rubbing machine with a roller (the roller is wound with nylon cloth), the formed roller is subjected to the condition that the rotation speed of the roller is 1,000 ...

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Abstract

The invention provides a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. The liquid crystal aligning agent is used for obtaining a liquid crystal aligning film with a high voltage retention rate and less thermal degradation when used at high temperature. The liquid crystal aligning agent comprises at least one polymer selected from a group formed by polyamide acid and its imidized polymer obtained by reaction of tetracarboxylic dianhydride and diamine; the tetracarboxylic dianhydride comprises at leasy any one of aliphatic tetracarboxylic dianhydride and alicyclic tetracarboxylic dianhydride (except 2,3,5-tricarboxycyclopentane-1-acetic acid); the diamine comprises compounds (D) shown in formula (1). In the formula (1), AIII is a monovalent group with an aromatic ring or a cyclohexylene ring as a ring structure.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. Background technique [0002] In the past, liquid crystal display elements were known as TN (Twisted Nematic, twisted nematic) mode or IPS (In-Plane Switching, in-plane switching) mode, FFS (Fringe Field Switching, fringe field switching) mode and other horizontal alignment liquid crystal displays. device, or a vertical alignment type liquid crystal display device such as a VA (Vertical Alignment, vertical alignment) mode. These liquid crystal display elements include a liquid crystal alignment film for aligning liquid crystal molecules. In addition, polyamic acid or polyimide is generally used as a material of a liquid crystal alignment film because various properties such as heat resistance, mechanical strength, and affinity with liquid crystals are good. [0003] In addition, in recent years, liquid crystal display eleme...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/1078C08L79/08C09K19/56G02F1/133723
Inventor 泉谦一
Owner JSR CORPORATIOON
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