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

A technology of liquid crystal display elements and liquid crystal alignment agents, applied in liquid crystal materials, instruments, optics, etc., can solve problems such as uneven printing, insufficient suppression, and insufficient yield of liquid crystal alignment film products, and achieve excellent performance and printability excellent effect

Inactive Publication Date: 2011-08-03
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even according to the technology in this document, the degree of suppression of deterioration in display quality during continuous driving for a long time is insufficient.
[0007] In addition, it is also pointed out that if a conventionally known liquid crystal aligning agent is used in the manufacture of a liquid crystal aligning film, printing defects such as uneven printing or pores will occur with a certain probability on the formed coating film, and the products in the manufacture of the liquid crystal aligning film Insufficient yield

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

[0125] Hereafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

[0126] The solution viscosity of the polymer and the imidation rate of the polyimide in the following synthesis examples were evaluated by the following methods, respectively.

[0127] [Solution Viscosity of Polymer]

[0128] The solution viscosity (mPa·s) of the polymer is a value measured at 25° C. for each polymer solution using an E-type rotational viscometer.

[0129] [Imidation rate of polyimide]

[0130] A small amount of the polyimide-containing solution obtained in each synthesis example was taken and poured into pure water, and the obtained precipitate was collected by filtration to isolate polyimide. After the polyimide was fully dried under reduced pressure at room temperature, it was dissolved in deuterated dimethyl sulfoxide, and tetramethylsilane was used as a reference, and the 1 In H-NMR, the imidation ratio was obtained from...

Synthetic example 1～31

[0136] In 135g of N-methyl-2-pyrrolidone, sequentially add diamine and tetracarboxylic dianhydride of the type and amount shown in Table 1 to make it dissolve, forming the total weight of diamine and tetracarboxylic dianhydride relative to the reaction The total weight of the solution was 10% by weight of the solution, and it was reacted at 60°C for 6 hours to obtain 150 g of solutions containing 10% by weight of polyamic acids (PA-1) to (PA-31). Table 1 shows the viscosities of the respective solutions obtained here together.

[0137] [Synthesis of polyimide]

Synthetic example OPA-1

[0172] 98g (0.50 mole) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride and 110g (0.50 mole) of pyromellitic dianhydride were mixed with 200g (1.0 mole) of diamine as tetracarboxylic dianhydride. ) 4,4'-diaminodiphenylmethane, dissolved in a mixed solvent of 230g N-methyl-2-pyrrolidone and 2100g γ-butyrolactone, reacted for 3 hours at 40°C, and then added 1350g γ-butyrolactone to obtain a solution containing 10% by weight of polyamic acid (OPA-1). The solution viscosity of this polyamic acid solution was 125 mPa·s.

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Abstract

The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. The invention provides a liquid crystal aligning agent which is provided with an excellent pretilt angle property by an optical alignment method, and can form a liquit crystal aligning film which does not result in poor display performance even when drived continuously for a long time. The liquit crystal aligning agent contains: (A) polyamide acid A, which is obtained by allowing tetracarboxylic dianhydride to react with diamines containing a diamine with a photoreactive structure; (B) polyamide acid B, which is obtained by allowing at least one tetracarboxylic dianhydride selected from a group composed of 1, 2, 3, 4-cyclobutane tetracarboxylic dianhydride, pyromellitic dianhydride to react with at least one diamine selected from a group composed of 2, 2'-dimethyl-4, 4'-diaminobiphenyl, p-phenylenediamine, 4, 4'-diaminodiphenylmethane, 4, 4'-diaminodiphenyl ether (with the polyamide acid A excluded).

Description

technical field [0001] The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. More specifically, this invention relates to the liquid crystal aligning agent which is excellent in printability and can form the liquid crystal aligning film which does not cause display performance to deteriorate even when it drives continuously for a long time. Background technique [0002] Conventionally, as the operation method of liquid crystal display elements, TN (twisted nematic) type and STN (super twisted nematic) type using liquid crystal molecules with positive dielectric anisotropy, etc., and using liquid crystal molecules with negative dielectric anisotropy are known. VA (Vertical Alignment) type of anisotropic liquid crystal molecules, etc., and in order to control the alignment of each liquid crystal molecule, a liquid crystal alignment film formed of an organic film is mainly used (Patent Documents 1 to 4). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/10C08G2261/53C08L79/08C09K19/56G02F1/1337G02F1/133723
Inventor 中田正一林英治西川通则
Owner JSR CORPORATIOON
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