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Liquid crystal aligning agent, and liquid crystal display element using same

A technology of liquid crystal aligning agent and liquid crystal aligning film, which is applied in coatings, instruments, optics, etc. It can solve the problems of insufficient substrate bonding and no covalent bond formation, so as to improve adhesion without reducing liquid crystal orientation Effect

Active Publication Date: 2016-06-29
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the panel becomes narrower, the coating position of the sealant used in the production of liquid crystal display elements will be the position in contact with the end of the liquid crystal alignment film, or it will be coated on the upper part of the liquid crystal alignment film. Polyimide There is no polar group or there are few polar groups, so there is a problem that the sealant does not form a covalent bond with the surface of the liquid crystal alignment film, and the adhesion between the substrates becomes insufficient.

Method used

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  • Liquid crystal aligning agent, and liquid crystal display element using same
  • Liquid crystal aligning agent, and liquid crystal display element using same
  • Liquid crystal aligning agent, and liquid crystal display element using same

Examples

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Embodiment

[0202] Examples are given below to further describe the present invention in detail. However, the present invention is not limitedly interpreted by these Examples. The abbreviations of the compounds used are shown below.

[0203] NMP: N-methyl-2-pyrrolidone GBL: γ-butyrolactone

[0204] BCS: Butyl Cellosolve IPA: 2-Propanol

[0205] NEP: N-ethyl-2-pyrrolidone PB: Propylene glycol monobutyl ether

[0206] DA-2: a compound represented by the following formula (DA-2)

[0207] DA-3: a compound represented by the following formula (DA-3)

[0208] DA-4: a compound represented by the following formula (DA-4)

[0209] DA-5: p-phenylenediamine

[0210] DA-6: 3,5-Diaminobenzoic acid

[0211] DA-7: 4,4’-Diaminodiphenylmethane

[0212] DA-8: 4,4’-Diaminodiphenylamine

[0213] DA-9: 1,3-bis(4-aminophenoxy)propane

[0214] DA-10: 1,5-bis(4-aminophenoxy)pentane

[0215] DA-11: a compound represented by the following formula (DA-11)

[0216] DA-12: a compound represented by the fo...

Synthetic example 1

[0262] Measure 2.92 g (27.0 mmol) of diamine DA-5 and 20.71 g (3.0 mmol) of diamine DA-20.71 g (3.0 mmol) into a 100 mL four-necked flask equipped with a stirring device and a nitrogen gas inlet tube, add 81.76 g of NMP, and stir while feeding nitrogen gas to make It dissolves. While stirring this diamine solution, carboxylic acid dianhydride DC-16.46 g (28.8 mmol) was added, and further, NMP was added so that the solid content concentration became 10% by mass, and stirred at room temperature for 4 hours to obtain a polyamic acid solution (PAA-1). The viscosity of this polyamic acid solution at a temperature of 25° C. was 230 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=11,131, Mw=30,009.

Synthetic example 2

[0264] Diamine DA-52.27g (21.0mmol) and diamine DA-42.69g (9.0mmol) were weighed into a 100mL four-neck flask equipped with a stirring device and a nitrogen gas inlet tube, NMP61.87g was added, and nitrogen gas was sent while stirring to make It dissolves. While stirring this diamine solution, carboxylic acid dianhydride DC-25.59 g (28.5 mmol) was added, and further, NMP was added so that the solid content concentration became 12 mass %, and it stirred at room temperature for 4 hours, thereby obtaining a polyamic acid solution (PAA-2) solution. The viscosity of the polyamic acid solution at a temperature of 25° C. was 410 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=9,042, Mw=19,958.

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Abstract

Provided is a liquid crystal aligning agent that can increase adhesiveness between a sealing agent and a liquid crystal alignment film, and can suppress display anomalies that may occur under high temperature and high humidity conditions in liquid crystal display elements near the frame. The liquid crystal alignment agent contains a component (A), a component (B), and an organic solvent. Component (A): at least one polymer selected from the group consisting of a polyimide precursor having a structural unit represented by formula (1), and an imidized polymer of said polyimide precursor. Component (B): a compound having a hydroxyalkylamide group. (X1 independently represents a tetravalent organic group; Y1 represents a divalent organic group; R1 represents a hydrogen atom or a C1-5 alkyl group; and A1 and A2 independently represent a hydrogen atom, a C1-10 alkyl group, a C2-10 alkenyl group, or a C2-10 alkynyl group, and said groups may have a substituent.)

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used for manufacture of a liquid crystal display element, the liquid crystal aligning film obtained from this liquid crystal aligning agent, and the liquid crystal display element using this liquid crystal aligning film. Background technique [0002] Liquid crystal display elements are known as light-weight, thin-volume and low-power display devices. In recent years, high-definition liquid crystal display devices for mobile phones and tablet-type terminals, which are rapidly expanding in market share, have achieved remarkable development to the extent that high display quality is required. [0003] The liquid crystal display element is constituted by sandwiching a liquid crystal layer between a pair of transparent substrates equipped with electrodes. In a liquid crystal display element, an organic film formed of an organic material is used as a liquid crystal alignment film to form a desired ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08L79/08
CPCG02F1/133723C09D179/08C08G73/1042C08G73/105C08G73/1078
Inventor 万代淳彦野口勇步
Owner NISSAN CHEM IND LTD
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