Liquid crystal alignment agent, liquid crystal alignment 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 the problems of narrow viewing angle, general products without suitable structure, half-tone brightness inversion, etc.

Inactive Publication Date: 2011-04-20
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] These liquid crystal display elements have disadvantages in that the viewing angle at which an image can be viewed appropriately is narrow, and when viewed from an oblique direction, a reduction in brightness or contrast and brightness inversion of halftones occur.
[0014] It can be seen that the above-mentioned existing liquid crystal alignment agents obviously still have inconvenience and defects in structure and use, and need to be further improved urgently.
In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but for a long time no suitable design has been developed, and the general product has no suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. Urgent problem

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

Examples

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example

[0450] Hereinafter, the present invention will be described by way of examples, but the present invention is not limited to these examples. Compounds used in Examples are shown below.

[0451]

[0452] BPDA-H: Dicyclohexanetetracarboxylic dianhydride, formula (Q), manufactured by Iwatani Gas Co., Ltd.

[0453] H-PMDA: cyclohexanetetracarboxylic dianhydride, formula (25)

[0454] CBDA: cyclobutane tetracarboxylic dianhydride, formula (19)

[0455] BTDA: butane tetracarboxylic dianhydride, formula (23)

[0456] PSQ1: 18,21-bis(3-(2,5-dioxotetrahydrofuran-3-yl)propyl)-18,21-dimethyl-1,3,5,7,9,11,13, 15-Octaphenyl-pentacyclo[10.5.1.25, 13.17, 11.19, 15] decasiloxane, formula (S-1)

[0457]

[0458] MBMA: 4,4'-methylenebis(3-methylaniline), formula (VI-1-5)

[0459] DDM: 4,4'-diaminodiphenylmethane, formula (VI-1-1)

[0460] 5ChCh: 5-{4-[4-(4-n-pentylcyclohexyl)]cyclohexyl}phenylmethyl-1,3-diaminobenzene, Y in formula (V-2-7) 2 Diamines that are alkyl groups of chain len...

Synthetic example 1

[0475] 0.285 g of 5ChCh, 1.341 g of MBMA, and 30.0 g of dehydrated NMP were placed in a 100 ml four-neck flask equipped with a thermometer, a stirrer, a raw material inlet, and a nitrogen inlet, and stirred under a dry nitrogen stream. Next, after adding 1.613 g of BPDA-H and 0.2610 g of BTDA and making it react for 30 hours, 16.5 g of BC was added, and the polyamic-acid solution PA1 whose polymer solid content concentration was 7 wt% was synthesized. When the temperature rises due to the reaction temperature during the reaction of the raw materials, the reaction is carried out while suppressing the reaction temperature to about 70° C. or lower.

[0476] The weight-average molecular weight of polyamic acid is obtained by the following method: the obtained polyamic acid is diluted with phosphoric acid-DMF mixed solution (phosphoric acid / DMF=0.6 / 100, weight ratio) so that the polyamic acid concentration becomes about 1 wt% was measured by the GPC method using a 2695 separation m...

Synthetic example 2

[0480] In addition to changing the tetracarboxylic dianhydride and diamine as shown in Table 1, based on Synthesis Example 1, the solid content concentration of the polymer in which an acid anhydride having a silsesquioxane skeleton was further used in the monomer was prepared as follows: 7wt% polyamic acid solution PA2. Table 1 summarizes the monomer compositions of the polyamic acid solutions of Synthesis Example 1, Synthesis Example 2, and Comparative Example 1 and Comparative Example 2, and the weight average molecular weight of the obtained polymer.

[0481] Table 1

[0482]

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Abstract

The invention discloses a liquid crystal alignment agent, containing polyamic acid prepared by reaction of tetracarboxylic dianhydride represented by a formula (Q) and specific side chain type diamine, and derivative thereof. The liquid crystal alignment agent can form a liquid crystal alignment film for vertical alignment. A liquid crystal element using the liquid crystal alignment film can keep high voltage ratio for long time in a heating test, and has effects of reducing residual DC.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent containing polyamic acid or its derivatives obtained by reacting tetracarboxylic dianhydride with diamine, a liquid crystal alignment film obtained from the liquid crystal alignment agent, and a liquid crystal alignment film with the liquid crystal alignment film Liquid crystal display element, in particular to a liquid crystal alignment agent that can be suitably used in liquid crystal display elements without physical rubbing treatment, a liquid crystal alignment film obtained from the liquid crystal alignment agent, and a liquid crystal display with the liquid crystal alignment film element. Background technique [0002] Liquid crystal display elements are used in various liquid crystals such as viewfinders of video cameras and projection displays, including monitors of note personal computers and desktop computers. Among display devices, it has recently begun to be used as a televis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56C08G73/10G02F1/1337
CPCC08G73/10C08L79/08C09K19/56G02F1/133723
Inventor 藤田幸宏近藤史尚藤原武
Owner JNC CORP
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