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Liquid crystal sealant and liquid crystal display unit using same

A technology of liquid crystal display unit and liquid crystal sealant, which is applied in the direction of instruments, optics, nonlinear optics, etc. It can solve the problems of unrecorded moisture permeability, low Tg, and slow response speed, etc., and achieve low liquid crystal pollution and excellent low water absorption , good penetration resistance

Inactive Publication Date: 2019-07-26
NIPPON KAYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description about moisture permeability, and the acrylic acid used in this technology is a polymer, and high reliability of liquid crystal cells cannot be obtained due to high moisture permeability
[0007] Patent Document 4 discloses a technology of a sealant with low moisture permeability, but there is no description about a sealant with a low Tg or a high water absorption rate. In an accelerated test, the following malfunctions of the liquid crystal display unit will occur over time: Uneven display or reduced response speed, etc.
[0008] As described above, although liquid crystal sealing agents are being developed very actively, a liquid crystal sealing agent that has a high Tg and is excellent in low moisture permeability and low water absorption has not yet been completed

Method used

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  • Liquid crystal sealant and liquid crystal display unit using same
  • Liquid crystal sealant and liquid crystal display unit using same
  • Liquid crystal sealant and liquid crystal display unit using same

Examples

Experimental program
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Embodiment

[0181] Hereinafter, the present invention will be described in more detail through synthesis examples and examples, but the present invention is not limited by the examples. In addition, unless otherwise stated, "part" and "%" are based on mass here.

Synthetic example 1

[0182] [Synthesis Example 1: Synthesis of 1,1-bi-2-binaphthol polyethoxy acrylate]

[0183] In a flask equipped with a stirring device, a reflux tube, and a thermometer, 286.3 g (1.0 mol) of 1,1'-bi-2-naphthol, 264.2 g (3.0 mol) of ethylene carbonate, and 41.5 g of lithium carbonate ( 0.3mol), toluene 2000mL, and reacted at 110° C. for 12 hours.

[0184] After the reaction, the obtained reaction liquid was washed with water, washed with a 1% NaOH aqueous solution, and then washed with water until the washing water became neutral. Using a rotary evaporator, the solvent was distilled off from the solution washed with water under reduced pressure to obtain 300.0 g of a reaction product of 1,1'-bi-2-naphthol with 2 mol of ethylene oxide.

[0185] Then, in a flask equipped with a stirring device, a reflux tube, a thermometer and a water separator, 187.2 g (0.5 mol) of ethylene oxide 2 mol reactant of 1,1'-bi-2-naphthol, 86.5 mol of acrylic acid g (2.4mol), 0.95g of p-toluenesulfo...

Synthetic example 2

[0186] [Synthesis Example 2: Synthesis of 1,2-bis(trimethylsilyloxy)-1,1,2,2-tetraphenylethane]

[0187] In a flask equipped with a stirring device, a reflux tube, and a thermometer, 100 parts (0.28 mol) of commercially available benzopinacol (manufactured by Tokyo Chemical Industry Co., Ltd.) were dissolved in 350 parts of dimethylformaldehyde. 32 parts (0.4 mol) of pyridine as a base catalyst and 150 parts (0.58 mol) of BSTFA (manufactured by Shin-Etsu Chemical Co., Ltd.) as a silylating agent were added thereto, and after heating up to 70 degreeC, it stirred for 2 hours. The obtained reaction liquid was cooled, and 200 parts of water were added, stirring, and the product was precipitated, and the unreacted silylating agent was deactivated. After the precipitated product was separated by filtration, it was sufficiently washed with water. Then, the obtained product was dissolved in acetone, and water was added to recrystallize it for purification. 105.6 parts of target 1,2-...

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Abstract

Provided is a liquid crystal sealing agent for liquid crystal dropping methods, which exhibits excellent application workability, low water vapor permeability and low water absorption, while having high Tg. A liquid crystal sealing agent for liquid crystal dropping methods, which contains (A) a compound represented by general formula (1-1) and (B) a radical polymerization initiator and / or (C) a thermal curing agent. In formula (1-a), each of X1 and X2 independently represents a group represented by one of general formulae (1-a) to (1-c), wherein R1 represents a hydrogen atom or a hydrocarbon group having 1-4 carbon atoms, R2 represents a hydrocarbon group having 1-5 carbon atoms, R3 represents a hydroxyl group or a substituent obtained by reacting a hydroxyl group with an acid anhydride, and each of p and q represents an average repetition number that is a number of 0-6.

Description

technical field [0001] The present invention relates to a liquid crystal sealing compound used in a liquid crystal dropping method and a liquid crystal display unit using the liquid crystal sealing compound. More specifically, the present invention relates to a liquid crystal sealing agent used in a liquid crystal dropping method, which can manufacture highly reliable liquid crystal display units because of its excellent coating workability, especially its excellent water vapor permeability and water absorption rate. . Background technique [0002] With the increase in size of liquid crystal display units in recent years, a so-called liquid crystal dropping method with higher mass productivity has been proposed as a method for manufacturing liquid crystal display units (Patent Document 1, Patent Document 2). Specifically, this method is a method of manufacturing a liquid crystal display unit in which liquid crystal is dropped on the inner side of a bank formed by a liquid c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1339C08F2/44C08F20/30C08G59/18
CPCC08F2/44C08F20/30C08G59/18G02F1/1339
Inventor 内藤伸彦土方大地山本和义小渊香津美锷本麻衣
Owner NIPPON KAYAKU CO LTD
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