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

A technology of liquid crystal alignment agent and liquid crystal alignment film, which is applied in optics, liquid crystal materials, nonlinear optics, etc., and can solve the problems of unstable liquid crystal alignment ability and large amount of radiation exposure.

Active Publication Date: 2008-06-25
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional photo-alignment technology using photo-crosslinkable materials such as polyvinyl cinnamate, there are problems such as a large amount of radiation exposure necessary to obtain stable liquid crystal alignment ability.
That is, in this liquid crystal aligning film, since the anisotropy of the liquid crystal aligning film is maintained by the crosslinked structure generated by radiation irradiation, when the radiation dose is not sufficiently large, the liquid crystal aligning ability is unstable.

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element and optical components
  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element and optical components
  • Liquid crystal aligning agent, liquid crystal aligning film, liquid crystal display element and optical components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0096] Although the present invention will be specifically described below by way of examples, the present invention is not limited to these examples.

[0097] [Measuring method of imidization rate of imidized polymer]

[0098] After the imidized polymer was dried under reduced pressure at room temperature, it was dissolved in deuterated dimethyl sulfoxide, and measured at room temperature with tetramethylsilane as the standard substance 1 H-NMR is obtained by the formula represented by the following formula (i).

[0099] Imidization rate (%) = (1-A 1 / A 2 ×α)×100 (1)

[0100] A 1 : Peak area of ​​proton derived from NH group (10ppm)

[0101] A 2 : Peak area derived from other protons

[0102] α: In the precursor of the polymer (polyamic acid), the ratio of the number of other protons to one proton of the NH group.

[0103] [solution viscosity]

[0104] The solution viscosity (mPa·s) of the polymer is measured at 25° C. using an E-type rotational viscometer for a solu...

Synthetic example 1

[0106] Polymerization of polyamic acid

[0107] Dissolve 0.1 mole (22 g) of 2,3,5-tricarboxycyclopentylacetic dianhydride and 0.1 mole (27 g) of 3,5-diaminobenzyl cinnamate in 300 g of N-methyl-2-pyrrolidone, The reaction was carried out at 60°C for 6 hours to obtain about 340 g of a polyamic acid solution (hereinafter referred to as "polymer 1a") having a solution viscosity of 50 mPa·s at a solid content concentration of 10% by weight.

[0108] imidization reaction

[0109] 210 g of N-methyl-2-pyrrolidone, 7.9 g of pyridine, and 10.2 g of acetic anhydride were added to 175 g of polymer 1a, followed by dehydration and ring closure at 120° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new N-methyl-2-pyrrolidone (this operation removes pyridine and acetic anhydride used in the imidation reaction from the system) To obtain a solid content concentration of about 10% by weight, a solution viscosity of about 55 mPa·s (N-methyl-2-pyrroli...

Synthetic example 2

[0111] Polymerization of polyamic acid

[0112]Solid content was obtained in the same manner as in Synthesis Example 1, except that 0.1 mol (25 g) of 2,4-diaminophenylcinnamate was used instead of 0.1 mol (27 g) of 3,5-diaminobenzylcinnamate. About 340 g of a polyamic acid solution (hereinafter referred to as "polymer 2a") having a solution viscosity of 45 mPa·s at a concentration of 10% by weight.

[0113] imidization reaction

[0114] Except for using 176 g of polymer 2a instead of 175 g of polymer 1a, the same operation was performed as in Synthesis Example 1 to obtain a solid content concentration of about 10% by weight and a solid content concentration of 10% by weight (N-methyl-2- pyrrolidone solution) having a solution viscosity of about 50 mPa·s and an imidization rate of about 47% of an imidized polymer solution (hereinafter referred to as "polymer 2b") was about 210 g.

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Abstract

The present invention provides a liquid crystal oriented agent of the polyamide acid or its imide polymer made by diamine such as 3, 5-diamino phenmethyl cinnamylate ester etc. The present invention provides a liquid crystal oriented agent using in the form of the liquid crystal oriented film having liquid crystal oriented ability by polarized or unpolarized radiation rays without processing friction treatment.

Description

technical field [0001] This invention relates to a liquid crystal aligning agent, a liquid crystal aligning film, a liquid crystal display element, and an optical member. More specifically, it relates to a liquid crystal aligning agent used in the formation of a liquid crystal aligning film capable of imparting liquid crystal aligning ability by irradiating polarized radiation without rubbing treatment, the liquid crystal aligning film, a liquid crystal display element having the liquid crystal aligning film, and Optical components. Background technique [0002] In the past, nematic liquid crystals with positive dielectric anisotropy have a sandwich structure on a substrate with a transparent electrode with a liquid crystal alignment film, and the long axis of the liquid crystal molecules is continuously twisted between the substrates by 0 to 360 as required. TN (twisted nematic, Twisted Nematic) type, STN (super twisted nematic, Super Twisted Nematic) type, IPS (transverse...

Claims

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Application Information

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IPC IPC(8): C09K19/38G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 中田正一角谷宪一西川通则熊野厚司
Owner JSR CORPORATIOON
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