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Alignment agent and liquid crystalline polyimide used therein

A technology of polyimide and alignment agent, which is applied in liquid crystal materials, nonlinear optics, instruments, etc., and can solve problems such as increasing light irradiation energy

Active Publication Date: 2013-04-10
长沙道安捷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain a photoalignment film with a large anchor energy, but in order to obtain a liquid crystal alignment film with sufficient anchor energy, the light irradiation energy has to be increased, and further improvement must be carried out.

Method used

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  • Alignment agent and liquid crystalline polyimide used therein
  • Alignment agent and liquid crystalline polyimide used therein
  • Alignment agent and liquid crystalline polyimide used therein

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0257] Hereinafter, although an Example and a comparative example demonstrate this invention, this invention is not limited to these Examples. Pyromellitic anhydride (PMDA, compound (A-1)), 1,2,3,4-cyclobutane tetracarboxylic acid (1,2,3,4-cyclobutanet racarboxylic acid, CBTA, compound (A-14)) and compound (2-13) were used in experiments after purification of commercially available compounds by recrystallization. 1,8-Diaminooctane (1,8-Diaminooctane, DAO, compound (VII-1-1)) was used after distilling a commercial product. Compound (II-1) and compound (A-21) were synthesized according to JP-A-5-65530 and JP-A-58-109479, respectively. The following compound (VII-2-1), compound (VII-2-2), and compound (VII-5-1) are based on Japanese Patent Application Laid-Open No. 11-160712 and Bulletin de la Societe Chimique de France, 9-10, Pr.2, the method disclosed in 2195 (1975) and synthesized. Compound (VIII-5) and Compound (VIII-6) were used in experiments without purification of comm...

Synthetic example 1

[0282]

[0283]

[0284] Synthesis was carried out in the same manner as the compound of (VII-2-2). Melting point: 98.0℃~99.2℃.

Synthetic example 2

[0286]

[0287]

[0288]Diethyl 4-bromophthalate (50g, 166mmol), 1,7-octadiyne (8.7g, 82mmol), triphenylphosphinepalladium(II) chloride (290mg, 0.41mmol), and A mixture of copper iodide (158 mmol, 0.83 mmol) was refluxed in triethylamine (200 mL) for 4 hours under nitrogen flow. After the reaction was completed, toluene (500 ml) and pure water (500 ml) were added for extraction. The organic layer was washed once with pure water (300 ml), and then dried over anhydrous magnesium sulfate. Filtration was performed, and the solvent was distilled off under reduced pressure to obtain the target 1,4-bis(3,4-dicarboxyphenyl)ethynylbutane tetraethyl ester. Yield 42 g, 95% yield. This compound was used directly in the next reaction without purification.

[0289] In 1,4-bis(3,4-dicarboxyphenyl)ethynylbutane tetraethyl ester (42g, 77mmol), add 5wt% palladium carbon catalyst (Pd / C) (2.1g), then in toluene / Hydrogenation was carried out at a hydrogen pressure of 720 MPa in an ethano...

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Abstract

PURPOSE: An alignment agent including liquid-crystalline polyamide, and the liquid-crystalline polyamide is provided to offer an alignment layer for rubbing with the high uniformity. CONSTITUTION: An alignment agent contains at least one polymer selected from the group consisting of polyamic acid and polyimide obtained from the dehydration reaction of the polyamic acid. The composition is capable of producing a film with a mesomorphic temperature range of 100~300 deg C. The polyamic acid has a photosensitive group at a main chain.

Description

technical field [0001] The present invention relates to an alignment agent mainly used in the manufacture of liquid crystal display elements. Background technique [0002] Liquid crystal display elements are used in viewfinders of video cameras, projection displays, etc., including monitors of notebook computers and desktop personal computers. Among various liquid crystal display devices, recently, they are also used in televisions. In addition, liquid crystal display elements are also used as optoelectronics-related elements such as optical printer heads, optical Fourier transform devices, and light valves. The mainstream of previous liquid crystal display elements is a display element using a nematic liquid crystal (nematic liquid crystal), and the alignment direction of the liquid crystal near one substrate and the alignment direction of the liquid crystal near the other substrate are set at 90 degrees. Liquid crystal display elements such as twisted nematic (TN) mode i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/1007C08G73/1078C08L79/08C08L2205/02C09K19/56G02F1/133723
Inventor 田村典央小口雄二郎
Owner 长沙道安捷新材料有限公司
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