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Liquid crystal aligning agent, and liquid crystal alignment film produced using same

A technology of liquid crystal aligning agent and liquid crystal aligning film, applied in coating, instrument, optics and other directions, can solve the problems of rising manufacturing cost of liquid crystal display panel, complicated and complicated plate exchange, etc., and achieve excellent linearity and dimensional stability, excellent characteristics , Excellent uniformity of film thickness

Active Publication Date: 2015-06-03
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are the following problems in flexographic printing: various resin plates are required depending on the type of liquid crystal panel; in the manufacturing process, the plate exchange is cumbersome and complicated; in order to stabilize the film formation process, it is necessary film formation on the screen; the production of the plate becomes one of the reasons for the increase in the manufacturing cost of the liquid crystal display panel
[0009] However, these methods have the disadvantage of requiring additional structures

Method used

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  • Liquid crystal aligning agent, and liquid crystal alignment film produced using same
  • Liquid crystal aligning agent, and liquid crystal alignment film produced using same
  • Liquid crystal aligning agent, and liquid crystal alignment film produced using same

Examples

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Embodiment

[0203] The following examples are given to further describe the present invention in detail. In addition, this invention is not limited and interpreted by these Examples.

[0204] Abbreviations of compounds used in Examples and Comparative Examples are as follows.

[0205] 1,3DMCBDE-Cl: Dimethyl 1,3-bis(chlorocarbonyl)-1,3-dimethylcyclobutane-2,4-dicarboxylate

[0206] BDA: 1,2,3,4-butanetetracarboxylic dianhydride

[0207] PMDA: pyromellitic dianhydride

[0208] DADPA: 4,4’-Diaminodiphenylamine

[0209] DBA: 3,5-diaminobenzoic acid

[0210] p-PDA: p-phenylenediamine

[0211] DA-A: the diamine of the following formula DA-A

[0212] [chem 25]

[0213]

[0214] (solvent)

[0215] NMP: N-methyl-2-pyrrolidone

[0216] GBL: gamma-butyrolactone

[0217] BCA: Butyl Cellosolve Acetate

[0218] BCS: Butyl Cellosolve

[0219] DPM: Dipropylene Glycol Monomethyl Ether

[0220] [viscosity]

[0221] For the viscosity of the solution of polyamic acid ester and polyamic acid, u...

Synthetic example 1

[0237] P-PDA (114.59g, 1.06mol) and DA-A (44.68g, 0.12mol) were added in a 300mL four-necked flask, NMP (1814mL), GBL (5175mL) and pyridine (210.1g, 2.66mol) were added, to dissolve. Next, stirring this solution, 1,3DMCBDE-Cl (359.85 g, 1.11 mol) was added, and it was made to react under water cooling for 4 hours. 500 mL of GBL was added and diluted to the obtained polyamic acid solution. 47300 g of IPA was poured in, stirring this solution, and the precipitated white deposit was filtered, and then, 23649 g of IPA wash|cleaned and dried 5 times, and obtained 428.0 g of white polyamic acid ester resin powders. The yield was 96%. Moreover, the molecular weight of this polyamic acid ester was Mn=15182, Mw=30115.

Synthetic example 2

[0239] Using BDA (175.94g, 0.74mol) and PMDA (52.34g, 0.20mol) as a tetracarboxylic dianhydride component, DADPA (191.28g, 0.80mol) and DBA (36.52g, 0.20mol) as a diamine component, In NMP516.9g and GBL 2068g, it was made to react at room temperature for 4 hours, and obtained the polyamic-acid solution. The molecular weight of this polyamic acid solution was Mn=15058, Mw=35072.

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Abstract

Provided is a liquid crystal aligning agent, from which a coating film having excellent thickness uniformity in a coating surface and excellent linearity and dimensional stability in a periphery of a coated part can be produced, and which is suitable particularly for the coating by an ink-jet method. A liquid crystal aligning agent characterized by comprising at least one polymer selected from the group consisting of polyimide and a polyimide precursor and a solvent comprising an alkyl cellosolve acetate compound represented by formula (1) and dipropylene glycol monomethyl ether. (In the formula, R1 represents an alkyl group having 1 to 8 carbon atoms.)

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent suitable for coating by an inkjet method and having high dimensional stability when coating, and a liquid crystal aligning film obtained from the liquid crystal aligning agent. Background technique [0002] As a liquid crystal aligning film, a so-called polyimide-based liquid crystal aligning film is widely used. Or a liquid crystal aligning agent mainly composed of a solution of a soluble polyimide is applied and fired. [0003] Spin coating, dip coating, flexographic printing, etc. are generally known as a film-forming method of the said liquid crystal aligning film. Actually, it is mostly coating by flexographic printing. [0004] However, there are the following problems in flexographic printing: various resin plates are required depending on the type of liquid crystal panel; in the manufacturing process, the plate exchange is cumbersome and complicated; in order to stabilize the fi...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08L79/08
CPCC08G73/1042C08G73/1075C08G73/1078C09D179/08G02F1/133711G02F1/133723
Inventor 野口勇步
Owner NISSAN CHEM IND LTD
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