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Liquid crystal aligning agent and lateral field style liquid crystal display element

A technology of liquid crystal display element and liquid crystal aligning agent, which is applied in the direction of liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of unresolved, insufficient afterimage and afterimage countermeasures, etc., and achieve high display quality and afterimage mitigation performance excellent effect

Inactive Publication Date: 2007-12-12
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above-mentioned patents, the countermeasures for solving afterimages and afterimages are still insufficient, and in particular, there is no solution at all for the restoration of the generated afterimages (afterimage alleviation).

Method used

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  • Liquid crystal aligning agent and lateral field style liquid crystal display element
  • Liquid crystal aligning agent and lateral field style liquid crystal display element
  • Liquid crystal aligning agent and lateral field style liquid crystal display element

Examples

Experimental program
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preparation example Construction

[0022] At least 50 mole % of the tetracarboxylic dianhydride used in the preparation of the polyamic acid polymer is pyromellitic dianhydride. Other tetracarboxylic dianhydrides that may be contained at 50% by mole or less include, for example, butane tetracarboxylic dianhydride, 1,2,3,4-cyclobutane tetracarboxylic dianhydride, 1,2-dimethyl -1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,3-dichloro- 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride, 1,2, 3,4-cyclopentane tetracarboxylic dianhydride, 1,2,4,5-cyclohexane tetracarboxylic dianhydride, 3,3',4,4'-dicyclohexyl tetracarboxylic dianhydride, 2 , 3,5-tricarboxycyclopentyl acetic dianhydride, 3,5,6-tricarboxynorbornane-2-acetic dianhydride, 2,3,4,5-tetrahydrofuran tetracarboxylic dianhydride, 1,3 , 3a, 4, 5, 9b-hexahydro-5-(tetrahydro-2,5-dioxo-3-furyl)-naphthalene[1,2-c]-furan-1,3-dione, 1,3...

Synthetic example 1

[0096] Synthesis example 1 (synthesis of imidized polymer)

[0097] 22.1 g (0.1 mol) of 2,3,5-tricarboxycyclopentyl acetic acid dianhydride as tetracarboxylic dianhydride, 9.7 g (0.09 mol) of p-phenylenediamine as diamine compound, and 4,4' -Diamino-2,2'-bis(trifluoromethyl)biphenyl 3.2g (0.01mol) was dissolved in 315g of N-methyl-2-pyrrolidone and reacted at 60°C for 4 hours to obtain 350g of a solution A polyamic acid solution with a viscosity of 35mPa·s. Next, 350 g of N-methyl-2-pyrrolidone, 39.5 g of pyridine and 30.6 g of acetic anhydride were added to the obtained polyamic acid solution, and dehydration and ring closure were performed at 110° C. for 4 hours. After the imidization reaction, perform solvent replacement with N-methyl-2-pyrrolidone that does not use a solvent in the system (in this operation, pyridine and acetic anhydride used in the imidization reaction are removed from the system) 340 g of an imidized polymer (A-1) solution having a solid content concen...

Synthetic example 2

[0098] Synthesis example 2 (synthesis of imidized polymer)

[0099] In Synthesis Example 1, in addition to using 8.7 g (0.08 moles) of p-phenylenediamine, 2.0 g (0.01 moles) of 4,4'-diaminodiphenylmethane and 4,4'-diamino-2,2' - 3.2 g (0.01 mol) of bis(trifluoromethyl)biphenyl was used as a diamine compound, and a polyamic acid was obtained in the same manner as in Synthesis Example 1, which was further used for imidization reaction in the same manner as in Synthesis Example 1, 24.9 g of imidized polymers (A-2) whose solid content concentration was 10 wt%, solution viscosity 30 mPa·s, and imidization rate 93% were obtained.

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Abstract

The invention relates to a liquid crystal orienting agent and a transverse electric field system liquid crystal display element. The transverse electric field system liquid crystal display element is with excellent afterimage retentivity and high pressure consevation rate and the liquid crystal orienting agent for this end. The said liquid crystal orienting agent is composed of polyamic acid and polyimide, wherein the at least 50-mol% of tetracarboxylic acid dianhydride is a thing originating in a pyromellitic anhydride, At least 0.5-mol% of diamine is a thing originating in a diamine compound containing a fluorine atom, it contains 40-89mol% of polyamic acid, based on the sum of the polyamic acid and polyimide.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent for a transverse electric field type and a transverse electric field type liquid crystal display element. More specifically, it is related with the liquid crystal aligning agent for the liquid crystal aligning film for a transverse electric field type which is excellent in afterimage relaxation performance, and has a high voltage retention rate, and the transverse electric field type liquid crystal display element produced therefrom. Background technique [0002] In the transverse electric field method in which electrodes are formed on only one side of the substrate and an electric field is applied in a direction parallel to the substrate, it has a wider viewing angle than the conventional vertical electric field method in which voltage is applied to electrodes formed on the upper and lower substrates to drive liquid crystals characteristics, and is known as a liquid crystal display elem...

Claims

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Application Information

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IPC IPC(8): C09K19/38G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 川口贵之德久博昭高桥敦也西川通则
Owner JSR CORPORATIOON
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