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

A technology of liquid crystal aligning agent and dicarboxyl, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of liquid crystals with sufficient voltage, contrast reduction, and image retention (热き负き) to achieve high voltage retention and small charge accumulation Effect

Active Publication Date: 2015-10-07
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the voltage holding ratio (VHR) of the liquid crystal aligning film is low, a sufficient voltage cannot be applied to the liquid crystal, and the contrast of the display decreases.
In addition, when it takes a long time to accumulate charges in the liquid crystal alignment film by driving the voltage of the liquid crystal, or to detach the accumulated charges, phenomena such as afterimages and image sticking (焼き复き) will occur.

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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Embodiment

[0172] Examples are given below and the present invention will be described in more detail. However, the present invention is of course not limitedly interpreted by these Examples. In addition, the abbreviations used below and the measuring method of each characteristic are as follows.

[0173] (tetracarboxylic dianhydride)

[0174] CBDA: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0175] TDA: 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride

[0176] PPHT: N,N'-bis(1,2-cyclohexanedicarboxylic anhydride-4-ylcarbonyl)-1,4-phenylenediamine

[0177] (diamine)

[0178] DBA: 3,5-diaminobenzoic acid

[0179] p-PDA: p-phenylenediamine

[0180] DDM: 4,4'-Diaminodiphenylmethane

[0181] BAPU: 1,3-bis(4-aminophenethyl)urea

[0182] APC16: 1,3-diamino-4-hexadecyloxybenzene

[0183] APC18: 1,3-Diamino-4-octadecyloxybenzene

[0184] DADPA: 4,4’-Diaminodiphenylamine

[0185] DA-5MG: 1,5-bis(4-aminophenoxy)pentane

[0186] (Organic solvents)

[0187] NMP: ...

Synthetic example

[0231] The numerical value in parentheses described after the tetracarboxylic acid component, diamine component, etc. shows the mole fraction of the raw material monomer at the time of polymer synthesis.

Synthetic example 1

[0233] Polymerization of polyamic acid [PAA-1: TDA(50)CBDA(50) / DDM(100)] and preparation of composition [AL-1: TDA(50)CBDA(50) / DDM(100)]

[0234] Weigh 2.78g (14.01mmol) of DDM in a 50ml four-neck flask equipped with a nitrogen inlet tube and a mechanical stirrer, add 17.40g of GBL and dissolve it, cool to about 10°C under a nitrogen atmosphere, and add it little by little TDA 2.10g (6.99mmol), returned to room temperature, and reacted for 2 hours. Then, CBDA1.26g (6.42mmol) and NMP17.40g were added, it returned to room temperature, it was made to react for 4 hours, and the solution of the polyamic acid [PAA-1] of 15 mass % was obtained. The number average molecular weight of the obtained polyamic acid [PAA-1] was 15,200, and the weight average molecular weight was 47,500.

[0235] Weigh 15.02 g of the obtained 15% by mass polyamic acid [PAA-1] solution in a 50 ml Erlenmeyer flask equipped with a stirrer, add 16.89 g of GBL and 5.64 g of BCS, and stir at room temperature for ...

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Abstract

The present invention pertains to a liquid crystal alignment agent containing component (A) and component (B) below, said liquid crystal alignment agent being at least one type of polymer selected from polyimides and polyimide precursors obtained through a polymerization reaction between a tetracarboxylic acid component and a diamine component. Component (A): A polymer containing at least one type of tetracarboxylic acid component selected from 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride or the like, and a diamine component having a side chain represented by formula (1). (In formula (1): P1 represents a single bond or the like; Q1, Q2 and Q3 each represent a divalent benzene ring or the like; p, q and r each represent 0 or 1; and P2 represents a hydrogen atom or the like.) Component (B): A polymer comprising only the aforementioned tetracarboxylic acid component, and a diamine component having a -CR21 2- group (here, each of the two R21s represents a hydrogen atom or the like) in the main chain.

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used when producing a liquid crystal aligning film, the liquid crystal aligning film and the liquid crystal display element using this liquid crystal aligning agent. Background technique [0002] Liquid crystal display elements are currently widely used as display devices. The liquid crystal aligning film which is a constituent member of a liquid crystal display element is a film for aligning liquid crystals uniformly, and not only the orientation uniformity of liquid crystals but also various characteristics are required. [0003] For example, in the manufacturing process of a liquid crystal aligning film, the orientation process of rubbing which wipes the surface of a polymer film with a cloth is performed normally. However, when the rubbing resistance of a liquid crystal aligning film is insufficient, a film will be abraded, a scratch or dust will generate|occur|produce, or a film itself w...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/10C08L79/08
CPCC08G73/1078C08G73/1042C08G73/106C08G73/1075C08L79/08G02F1/133723
Inventor 金尔润
Owner NISSAN CHEM IND LTD
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