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Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element, and method for manufacturing liquid crystal display element

A technology of liquid crystal aligning agent and structural unit, used in instruments, optics, nonlinear optics, etc., can solve problems such as the reduction of voltage retention rate, and achieve the effect of high voltage retention rate and high durability

Pending Publication Date: 2022-07-15
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These liquid crystal display elements use a backlight that generates a lot of heat to obtain high brightness. In automotive applications such as car navigation systems and measuring instrument panels, they may be used or left in a high-temperature environment for a long time, so the drop in voltage retention is more significant.

Method used

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  • Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element, and method for manufacturing liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element, and method for manufacturing liquid crystal display element
  • Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element, and method for manufacturing liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0179] Although an Example is given and this invention is demonstrated in detail below, this invention is not limited to these. The meanings of the abbreviations of the compounds used in the examples are shown below.

[0180]

[0181] ISOBAM: poly(isobutylene-o-maleic anhydride) Mn (number average molecular weight): 160,000 to 170,000 (manufactured by KURARAY, ISOBAM-10) (corresponding to polymer (A)).

[0182]

[0183] (diamine)

[0184] DBA: 3,5-diaminobenzoic acid.

[0185] 3AMPDA: 3,5-diamino-N-(pyridin-3-ylmethyl)benzamide.

[0186]

[0187] (tetracarboxylic acid component)

[0188] PMDA: pyromellitic anhydride.

[0189] D1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride.

[0190] D2: Bicyclo[3,3,0]octane-2,4,6,8-tetracarboxylic dianhydride.

[0191] D3: 2,3,5-tricarboxycyclopentylacetic dianhydride.

[0192] (specific crosslinking agent)

[0193] AD-1: N,N,N',N'-tetrakis(2-hydroxyethyl) adipamide.

[0194] PEA: hexadecylamide ethanol.

[0195]

[0196...

Synthetic example 2～6

[0215] The mixed solutions (IP-2) to (IP-3) or mixed solutions (IP-2) to (IP-3) or mixed solutions ( IT-1) to (IT-3). At this time, the type and addition amount of the crosslinking agent used for the preparation are shown in Table 1 below.

[0216]

[0217] ISOBAM (3.50 g) was added to NMP (17.5 g) and fully dissolved over 60 minutes with vigorous stirring. After confirming dissolution, stirring was continued for further 18 hours, and a solution (IB-1) was obtained.

[0218]

[0219] ISOBAM (3.50g) was added to NMP (13.06g), and it was made to melt|dissolve fully over 60 minutes under strong stirring and 25 degreeC environment. After confirming the dissolution, a 10% NMP solution (1.05 g) of PEA prepared in advance was added to the system, and the mixture was reacted for 18 hours to obtain a mixed solution (IB-2).

[0220] [Table 1]

[0221]

[0222]

[0223]

[0224] D3 (384.45 g, 1715 mmol) as tetracarboxylic dianhydride, DA-5 (144.54 g, 437.5 mmol) as diamine...

example 1

[0239] The solution (IP-1) (3.00 g) obtained in Synthesis Example 1 was weighed into a 20 mL sample tube to which a stirring bar was added, NMP (3.00 g) and BCS (6.00 g) were added, and the solution was stirred with a magnetic stirrer for 30 minutes. , and obtained a liquid crystal aligning agent (A-1) as a solution. As a result of storing A-1 at -20°C for 1 week, precipitation of solid matter was not observed, and it was a homogeneous solution.

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PUM

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Abstract

The invention provides a liquid crystal aligning agent which can obtain a liquid crystal alignment film which is not easy to peel off a substrate and can obtain a liquid crystal display element with high durability to external pressure. The liquid crystal aligning agent is characterized by containing the following component (A) and component (B). Component (A): a polymer (A) having a structural unit represented by formula (m). (R1 and R2 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1-3 carbon atoms) component (B): at least one compound (B) selected from the following compounds: a compound having two or more partial structures selected from the group consisting of partial structures represented by formula (b-1) and formula (b-2), and a compound having two or more epoxy groups; a compound having two or more oxetane rings; and a compound having two or more oxazoline rings. (R2 and R2'each independently represent a hydrogen atom, an alkyl group having 1-3 carbon atoms, or a group "* 3-CH2-O-R11" (wherein R11 represents a hydrogen atom or an alkyl group having 1-3 carbon atoms). (In the formula, * 1 represents a hydrogen atom or an alkyl group having 1-3 carbon atoms, * 3 represents a bonding bond of a carbon atom to which R2 and R2 'are bonded), R3 and R3' each independently represent a hydrogen atom or an alkyl group having 1-3 carbon atoms, Y represents an aromatic ring having a valence of (n2a + n2b + 1), R represents a hydrogen atom or an alkyl group having 1-3 carbon atoms, at least one of R represents a hydrogen atom when n2b is 0, n1 represents 0 or 1, n2a represents an integer of 1-6, n2b represents an integer of 0-6, * 1 and * 2 represent bonding bonds, and * represents a bonding bond.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film, a liquid crystal display element, and a manufacturing method of the liquid crystal display element. Background technique [0002] Liquid crystal display elements are widely used in personal computers, cellular phones, smart phones, televisions, and the like. In recent years, there are many opportunities to use liquid crystal display elements under high temperature and high humidity, such as in-vehicle navigation and measuring instruments mounted on vehicles, and display units of industrial equipment and measuring equipment installed outdoors. [0003] This liquid crystal display element usually includes: a liquid crystal layer, which is sandwiched between the element substrate and the color filter substrate; a pixel electrode and a common electrode, which apply an electric field to the liquid crystal layer; a liquid crystal alignment film, which controls t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08K5/053C08L35/00C08L79/08
CPCC08L79/08C08K5/053C08L35/00G02F1/1337C08L35/02C08K5/20C08K5/34924C08K5/3445
Inventor 山极大辉
Owner NISSAN CHEM IND LTD
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