CN113168054A - Liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element using same - Google Patents
Liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element using same Download PDFInfo
- Publication number
- CN113168054A CN113168054A CN201980080517.7A CN201980080517A CN113168054A CN 113168054 A CN113168054 A CN 113168054A CN 201980080517 A CN201980080517 A CN 201980080517A CN 113168054 A CN113168054 A CN 113168054A
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- CN
- China
- Prior art keywords
- liquid crystal
- polymer
- diamine
- aligning agent
- crystal aligning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 46
- 229920000642 polymer Polymers 0.000 claims abstract description 101
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- 150000000000 tetracarboxylic acids Chemical class 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 125000000962 organic group Chemical group 0.000 claims abstract description 7
- 125000003118 aryl group Chemical group 0.000 claims abstract description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 26
- 125000004427 diamine group Chemical group 0.000 claims description 21
- 230000005684 electric field Effects 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 125000006239 protecting group Chemical group 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- BMRWNKZVCUKKSR-UHFFFAOYSA-N butane-1,2-diol Chemical compound CCC(O)CO BMRWNKZVCUKKSR-UHFFFAOYSA-N 0.000 description 1
- 235000019437 butane-1,3-diol Nutrition 0.000 description 1
- OWBTYPJTUOEWEK-UHFFFAOYSA-N butane-2,3-diol Chemical compound CC(O)C(C)O OWBTYPJTUOEWEK-UHFFFAOYSA-N 0.000 description 1
- RRIRSNXZGJWTQM-UHFFFAOYSA-N butyl 3-methoxypropanoate Chemical compound CCCCOC(=O)CCOC RRIRSNXZGJWTQM-UHFFFAOYSA-N 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 229920002678 cellulose Chemical class 0.000 description 1
- 239000001913 cellulose Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- POLCUAVZOMRGSN-UHFFFAOYSA-N dipropyl ether Chemical compound CCCOCCC POLCUAVZOMRGSN-UHFFFAOYSA-N 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical compound [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- IJUHLFUALMUWOM-UHFFFAOYSA-N ethyl 3-methoxypropanoate Chemical compound CCOC(=O)CCOC IJUHLFUALMUWOM-UHFFFAOYSA-N 0.000 description 1
- 229940117360 ethyl pyruvate Drugs 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- RXTNIJMLAQNTEG-UHFFFAOYSA-N hexan-2-yl acetate Chemical compound CCCCC(C)OC(C)=O RXTNIJMLAQNTEG-UHFFFAOYSA-N 0.000 description 1
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 description 1
- HSDFKDZBJMDHFF-UHFFFAOYSA-N methyl 3-ethoxypropanoate Chemical compound CCOCCC(=O)OC HSDFKDZBJMDHFF-UHFFFAOYSA-N 0.000 description 1
- BDJSOPWXYLFTNW-UHFFFAOYSA-N methyl 3-methoxypropanoate Chemical compound COCCC(=O)OC BDJSOPWXYLFTNW-UHFFFAOYSA-N 0.000 description 1
- CWKLZLBVOJRSOM-UHFFFAOYSA-N methyl pyruvate Chemical compound COC(=O)C(C)=O CWKLZLBVOJRSOM-UHFFFAOYSA-N 0.000 description 1
- 229940017144 n-butyl lactate Drugs 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000728 polyester Chemical class 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920001296 polysiloxane Chemical class 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- ILVGAIQLOCKNQA-UHFFFAOYSA-N propyl 2-hydroxypropanoate Chemical compound CCCOC(=O)C(C)O ILVGAIQLOCKNQA-UHFFFAOYSA-N 0.000 description 1
- JCMFJIHDWDKYIL-UHFFFAOYSA-N propyl 3-methoxypropanoate Chemical compound CCCOC(=O)CCOC JCMFJIHDWDKYIL-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/56—Aligning agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
Abstract
The invention provides a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element, wherein the liquid crystal aligning agent can obtain a liquid crystal aligning film with fast relaxation of accumulated charges and small accumulation amount of charges. The liquid crystal aligning agent of the present invention contains the following polymer (A) and polymer (B). Polymer (a): a polymer obtained by reacting a tetracarboxylic acid derivative component with a diamine component comprising a diamine represented by the following formula (1) and a diamine represented by the following formula (2). Polymer (B): by mixing a tetracarboxylic acid derivative component with at least one diamine represented by the following formula (3)A polymer obtained by reacting the diamine component (b). Wherein, Y2Is a divalent organic group having a nitrogen atom or a nitrogen-containing aromatic heterocyclic ring bonded to an aromatic group.
H2N‑Y2‑NH2 (3)。
Description
Technical Field
The present invention relates to a liquid crystal aligning agent, a liquid crystal alignment film obtained from the liquid crystal aligning agent, and a liquid crystal display element provided with the liquid crystal alignment film obtained.
Background
Liquid crystal display elements are widely used as display portions of personal computers, cellular phones, smart phones, televisions, and the like. The liquid crystal display element includes, for example: a liquid crystal layer sandwiched between the element substrate and the color filter substrate; a pixel electrode and a common electrode for applying an electric field to the liquid crystal layer; a liquid crystal alignment film that controls alignment of liquid crystal molecules of the liquid crystal layer; and a Thin Film Transistor (TFT) for converting (switching) an electric signal supplied to the pixel electrode. As a driving method of liquid crystal molecules, there are known: a Vertical electric field system such as a TN (Twisted Nematic) system and a VA (Vertical Alignment) system; In-Plane Switching (IPS) mode, Fringe Field Switching (FFS) mode, and other horizontal electric Field modes. Among them, a lateral electric field system in which liquid crystal molecules are switched in parallel with a substrate has a wider viewing angle characteristic than a longitudinal electric field system, and is known as a liquid crystal display element capable of performing high-quality gradation display.
As factors that affect the display quality level of the liquid crystal device, uniformity of liquid crystal alignment, and voltage holding ratio, charge storage characteristics, and the like of the liquid crystal cell are known. For example, when the voltage holding ratio is low, a sufficient voltage cannot be applied to the liquid crystal, and the display contrast is lowered. In addition, when electric charges are accumulated in the liquid crystal cell, the alignment of the liquid crystal is disturbed, or phenomena such as image sticking and image sticking are caused, which significantly degrades the display quality level of the liquid crystal element.
In particular, in the lateral electric field system, as compared with the vertical electric field system, since the number of electrode portions formed in the substrate is small, the voltage holding ratio is liable to be lowered, or since a strong electric field acts on the alignment film or the liquid crystal layer due to the close distance between the pixel electrode and the common electrode, charge is liable to be accumulated, and the like, and defects due to the insufficiency of the voltage holding ratio and the charge accumulation characteristic are liable to become remarkable. In addition, in the transverse electric field system, if the alignment regulating force of the liquid crystal is weak, the liquid crystal cannot return to the initial alignment state when the liquid crystal is driven for a long time, which causes a decrease in contrast or an afterimage, and therefore, the alignment regulating force of the liquid crystal alignment film is also important.
In order to solve the above-described problems of the transverse electric field system, a method of using a liquid crystal alignment film obtained from a liquid crystal alignment agent in which a high-alignment polymer and a low-resistance polymer are mixed has been proposed (patent document 1).
Documents of the prior art
Patent document
Patent document 1: international laid-open publication WO2004/53583 pamphlet
Disclosure of Invention
Problems to be solved by the invention
The properties required for the liquid crystal alignment film are becoming more stringent as the performance of the liquid crystal display device is increased. In particular, the FFS mode is a structure in which charges are easily accumulated in the liquid crystal cell and the accumulated charges are not easily removed, compared to the IPS mode which is the same as the lateral electric field mode, and therefore, characteristics such as not only suppressing the accumulation of charges but also rapidly relaxing the accumulated charges are important. Further, since the FFS mode has a higher electric field strength than the IPS mode, the requirement for the alignment regulating force of the liquid crystal is also strict.
In view of the above, an object of the present invention is to provide a liquid crystal aligning agent that can obtain a liquid crystal alignment film suitable for a liquid crystal display element of a lateral electric field system, particularly an FFS system, and further can obtain a liquid crystal alignment film that has a small amount of accumulated charges and a rapid relaxation of the accumulated charges even in the FFS system.
Means for solving the problems
The present inventors have made extensive studies to achieve the above object, and as a result, have found that the above object can be achieved by the following invention.
A liquid crystal aligning agent comprising the following polymer (A) and polymer (B).
Polymer (a): a polymer obtained by reacting a tetracarboxylic acid derivative component with a diamine component comprising a diamine represented by the following formula (1) and a diamine represented by the following formula (2).
Polymer (B): a polymer obtained by the reaction of a tetracarboxylic acid derivative component with a diamine component containing at least one of the diamines represented by the following formula (3).
H2N-Y2-NH2 (3)
(Y2Is a divalent organic group having a nitrogen atom or a nitrogen-containing aromatic heterocyclic ring bonded to an aromatic group. )
Effects of the invention
According to the present invention, it is possible to improve the display performance of the liquid crystal display element of the lateral electric field system, and in particular, to improve the display performance such that the amount of accumulated electric charges is small and the accumulated electric charges are relaxed quickly in the liquid crystal display element of the FFS system.
Detailed Description
The polymer (a) and the polymer (B) used in the present invention are both polymers obtained by the reaction of a tetracarboxylic acid derivative component and a diamine component.
Examples of tetracarboxylic acid derivatives include: tetracarboxylic dianhydride, tetracarboxylic disiloxane, tetracarboxylic dichloride, tetracarboxylic dialkyl ester, tetracarboxylic dialkenyl ester, tetracarboxylic dialkyl dichloride, and the like.
Examples of the polymer obtained by the reaction of the tetracarboxylic acid derivative component and the diamine component include: polyamic acid, polyamic acid ester, polyimide which is an imidized polymer of the polyamic acid or polyamic acid ester, and the like. The reaction conditions and the like for producing these polymers are not particularly limited, and known methods can be used.
The polymer used in the present invention may be a polymer in which the main chain end is modified with a compound that is monofunctional with respect to the tetracarboxylic acid derivative component and/or the diamine component. Examples of the monofunctional compound include: monoamines, monoisocyanates, compounds having one acid anhydride group, compounds having one acid chloride group, and the like.
In the present invention, the "tetracarboxylic acid residue" refers to a structure derived from the above-mentioned tetracarboxylic acid derivative component, and refers to a tetravalent structure obtained by removing four carboxyl groups or groups derived from the carboxyl groups of the tetracarboxylic acid derivative component. The "diamine residue" refers to a structure derived from the diamine component, and refers to a divalent structure obtained by removing two amino groups of a diamine.
< Polymer A >
The polymer (a) is a polymer obtained by (polycondensation) reaction of a tetracarboxylic acid derivative component with a diamine component containing a diamine represented by the following formula (1) and a diamine represented by the following formula (2).
The diamine residue in the polymer (A) has at least two structures of a diamine residue derived from a diamine of formula (1) and a diamine residue derived from a diamine of formula (2).
In the polymer (a), the diamine residue derived from the diamine of formula (1) is preferably 10 mol% or more, more preferably 20 mol% or more of all diamine residues of the polymer (a). In the polymer (a), the diamine residue derived from the diamine of the formula (2) is preferably 30 mol% or more, more preferably 40 mol% or more of all the diamine residues of the polymer (a).
The polymer (A) may have diamine residues derived from diamines other than the diamines of the formulae (1) and (2). Examples of the other diamine include diamines represented by the following formula (4) (except diamines of the formulae (1) and (2)).
In the formula (4), Y1Represents a divalent organic group, and each of the two R's independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
Y in the formula (4) is shown below1The preferable specific examples of (A) include (Y1-1) to (Y1-18), but the present invention is not limited thereto.
When the polymer (a) has a diamine residue derived from a diamine other than the diamines of the formulae (1) and (2), the total of the diamine residue derived from the diamine of the formula (1) and the diamine residue derived from the diamine of the formula (2) is preferably 50 mol% or more, more preferably 60 mol% or more of all the diamine residues of the polymer (a).
In addition, from the viewpoint that the polymer (a) is likely to be biased in the vicinity of the surface layer of the liquid crystal alignment film when the liquid crystal alignment agent of the present invention is applied to a substrate, thereby improving the liquid crystal alignment property, it is preferable to use Y in the formula (4) as the other diamine1Is at least one diamine having a structure represented by the following formula (5).
In the formula (5), D represents a protecting group which is released by heating at preferably 80 to 250 ℃ and particularly preferably 80 to 230 ℃ and is substituted with a hydrogen atom, and represents a bonding site with another structure. A preferred example of D is tert-butoxycarbonyl.
Y having the structure of formula (5) is listed below1The preferable specific examples of (5-1) to (5-9) of (4) are not intended to limit the scope of the present invention. In the following structure, Boc represents a tert-butoxycarbonyl group.
In the polymer (a), the residue of the diamine represented by the formula (4) is preferably 1 to 40 mol%, more preferably 5 to 30 mol% of all the diamine residues of the polymer (a).
The structure of the tetracarboxylic acid residue in the polymer (a) is not particularly limited. The tetracarboxylic acid residue of the polymer (a) may have one structure, or two or more kinds may be mixed.
Preferred structures of the tetracarboxylic acid residue in the polymer (A) are shown below as (A-1) to (A-21), but the present invention is not limited thereto.
The molecular weight of the polymer (A) is not particularly limited as long as a good coating film can be formed, and is, for example, preferably 2000 to 500000, more preferably 5000 to 300000, and further preferably 10000 to 100000 in terms of weight average molecular weight. The number average molecular weight is preferably 1000 to 250000, more preferably 2500 to 150000, and further preferably 5000 to 50000.
< Polymer B >
The polymer (B) is a polymer obtained by the reaction of a tetracarboxylic acid derivative component and a diamine component containing at least one of the diamines represented by the following formula (3).
H2N-Y2-NH2 (3)
In the formula (3), Y2Is a divalent organic group having a nitrogen atom or a nitrogen-containing aromatic heterocyclic ring bonded to an aromatic group.
Particularly preferred examples of Y are shown below2(Y2-1) to (Y2-14) in the above-mentioned manner, but the present invention is not limited thereto.
The diamine residue structure of the polymer (B) may be one type or two or more types may be present in combination, but at least one type is Y in the formula (3)2The structure of (1).
In the polymer (B), as Y2The diamine residue in the structure (B) is preferably 50 mol% or more, more preferably 60 mol% or more of all diamine residues in the polymer (B).
The polymer (B) may have a diamine residue derived from a diamine other than the diamine represented by the formula (3). As the other diamine, a compound represented by the above formula (4) may be used as the other diamine in the polymer (a) (except for the diamine represented by the formula (3)). The amount of the other diamine used in this case is also the same as that in the polymer (A).
The structure of the tetracarboxylic acid residue in the polymer (B) is not particularly limited. The tetracarboxylic acid residue of the polymer (B) may have one structure, or two or more kinds may be mixed.
The preferred structure of the tetracarboxylic acid residue in the polymer (B) is exemplified by the preferred structure shown in the polymer (a), but the present invention is not limited thereto.
The molecular weight of the polymer (B) is not particularly limited as long as a good coating film can be formed, and is, for example, preferably 2000 to 500000, more preferably 5000 to 300000, and further preferably 10000 to 100000 in terms of weight average molecular weight. The number average molecular weight is preferably 1000 to 250000, more preferably 2500 to 150000, and further preferably 5000 to 50000.
< liquid Crystal Aligning agent >
The content ratio of the polymer (a) to the polymer (B) in the liquid crystal aligning agent of the present invention is not particularly limited, and the content of the polymer (a) is preferably 10 to 50% by mass, and more preferably 20 to 40% by mass, based on the total amount of the polymer (a) and the polymer (B). That is, the content of the polymer (B) is preferably 90 to 50% by mass, and more preferably 80 to 60% by mass, based on the total amount of the polymer (a) and the polymer (B).
The liquid crystal aligning agent of the present invention may contain other polymers than the polymer (a) and the polymer (B). The other polymer is not particularly limited, and examples thereof include: a polymer having a main skeleton such as polyamic acid, polyamic acid ester, polyimide, polysiloxane, polyester, cellulose derivative, polyacetal, polystyrene derivative, poly (styrene-maleimide) derivative, or poly (meth) acrylate.
The liquid crystal aligning agent of the present invention may contain components other than polymers. Examples of the components other than the polymer include: a dielectric or conductive material for changing electrical characteristics such as dielectric constant and conductivity of the liquid crystal alignment film; a silane coupling agent for the purpose of improving the adhesion between the liquid crystal alignment film and the substrate; a crosslinkable compound for the purpose of improving the hardness and density of the film when the liquid crystal alignment film is produced; and an imidization accelerator for efficiently imidizing the polyamic acid when the coating film is baked.
The liquid crystal aligning agent of the present invention is a liquid crystal aligning agent used for producing a liquid crystal alignment film, and is preferably a coating solution in which the above components are dissolved in an organic solvent from the viewpoint of forming a uniform thin film. The concentration of the coating liquid is appropriately changed depending on the coating apparatus used and the thickness of the liquid crystal alignment film to be obtained. The concentration of the polymer is preferably 1 mass% or more in terms of forming a uniform and defect-free coating film, and is preferably 10 mass% or less in terms of storage stability of the solution. The concentration of the polymer is particularly preferably 2 to 8 mass%.
The organic solvent used in the coating liquid is not particularly limited as long as the polymer component is uniformly dissolved. Specific examples thereof include: n, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl sulfoxide, γ -butyrolactone, 1, 3-dimethyl-imidazolidinone, methyl ethyl ketone, cyclohexanone, cyclopentanone, and the like. Among them, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ -butyrolactone is preferable. Two or more of these solvents may be used in combination.
In addition, in the composition intended to form a coating film, a mixed solvent containing a solvent for improving coatability and improving smoothness of the surface of the coating film is generally used in addition to the above-mentioned solvents, and such a mixed solvent is preferably used in the liquid crystal aligning agent of the present invention. Specific examples of the mixed organic solvent are listed below, but are not limited to these examples.
For example, there may be mentioned: ethanol, isopropanol, 1-butanol, 2-butanol, isobutanol, tert-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, isopentanol, tert-pentanol, 3-methyl-2-butanol, neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-ethyl-1-butanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-octanol, 2-ethyl-1-hexanol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclohexanol, 3-methylcyclohexanol, 1, 2-ethylene glycol, 1, 2-propylene glycol, 1, 3-propylene glycol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 1, 5-pentanediol, 2-methyl-2, 4-pentanediol, 2-ethyl-1, 3-hexanediol, Dipropyl ether, dibutyl ether, dihexyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, 1, 2-butoxyethane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, 4-hydroxy-4-methyl-2-pentanone, diethylene glycol methyl ethyl ether, diethylene glycol dibutyl ether, 2-pentanone, 3-pentanone, 2-hexanone, 2-heptanone, 4-heptanone, 3-ethoxybutyl acetate, 1-methylpentyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, ethylene glycol monoacetate, ethylene glycol diacetate, propylene carbonate, ethylene carbonate, 2- (methoxymethoxy) ethanol, ethylene glycol monobutyl ether, ethylene glycol monoisoamyl ether, ethylene glycol monohexyl ether, 2- (hexyloxy) ethanol, furfuryl alcohol, diethylene glycol, propylene glycol, diethylene glycol, ethylene glycol di-butyl ether, ethylene glycol monohexyl ether, 2- (hexyloxy) ethanol, furfuryl alcohol, diethylene glycol, propylene glycol, and mixtures thereof, Propylene glycol monobutyl ether, 1- (butoxyethoxy) propanol, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol dimethyl ether, tripropylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monoacetate, ethylene glycol diacetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, 2- (2-ethoxyethoxy) ethyl acetate, diethylene glycol acetate, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, n-butyl acetate, propylene glycol monoethyl ether acetate, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl 3-ethoxypropionate, methyl ethyl acetate, propylene glycol monoethyl ether, propylene glycol ether, propylene glycol ether, Ethyl 3-methoxypropionate, 3-ethoxypropionate, 3-methoxypropionate, propyl 3-methoxypropionate, butyl 3-methoxypropionate, methyl lactate, ethyl lactate, n-propyl lactate, n-butyl lactate, isoamyl lactate, and solvents represented by the following formulae [ D-1 ] to [ D-3 ].
(R in the formulae [ D-1 ] and [ D-2 ] represents an alkyl group having 1 to 3 carbon atoms, and R in the formula [ D-3 ] represents an alkyl group having 1 to 4 carbon atoms.)
Of the above, 1-hexanol, cyclohexanol, 1, 2-ethylene glycol, 1, 2-propylene glycol, propylene glycol monobutyl ether, diethylene glycol diethyl ether, 4-hydroxy-4-methyl-2-pentanone, ethylene glycol monobutyl ether, or dipropylene glycol dimethyl ether are preferable. The kind and content of such a solvent are appropriately selected depending on the coating apparatus, coating conditions, coating environment, and the like of the liquid crystal aligning agent. Two or more of these solvents may be used in combination.
< liquid Crystal alignment film >
The liquid crystal alignment film of the present invention is obtained from the liquid crystal aligning agent of the present invention. An example of a method for obtaining a liquid crystal alignment film from a liquid crystal alignment agent is: a method of applying a liquid crystal aligning agent in the form of a coating liquid to a substrate, drying the applied liquid crystal aligning agent, and baking the dried liquid crystal aligning agent to obtain a film, and performing an aligning treatment by a brushing treatment method or a photo-aligning treatment method.
The substrate to which the liquid crystal aligning agent is applied is not particularly limited, and a plastic substrate such as a glass substrate, a silicon nitride substrate, an acryl substrate, or a polycarbonate substrate may be used. In this case, it is preferable to use a substrate on which an ITO electrode or the like for driving liquid crystal is formed, from the viewpoint of simplification of the process. In the reflective liquid crystal display element, an opaque object such as a silicon wafer may be used as a single-sided substrate, and in this case, a material that reflects light such as aluminum may be used as an electrode.
The method of applying the liquid crystal aligning agent is not particularly limited, and the method is generally industrially screen printing, gravure printing, flexo printing, ink jet method, or the like. As other coating methods, there are a dipping method, a roll coating method, a slit coating method, a spin coating method, a spray coating method, and the like, and they can be used according to the purpose.
After coating the liquid crystal alignment agent on the substrate, the solvent is evaporated by a heating means such as a hot plate, a thermal cycle oven, or an IR (infrared ray) oven, and then fired. The drying and firing steps after the application of the liquid crystal aligning agent can be performed at any temperature and for any time. In order to sufficiently remove the solvent contained therein, the firing is usually carried out at 50 to 120 ℃ for 1 to 10 minutes and then at 150 to 300 ℃ for 5 to 120 minutes.
The thickness of the liquid crystal alignment film after firing is not particularly limited, but if it is too thin, the reliability of the liquid crystal display element may be lowered, and therefore, it is preferably 5 to 300nm, more preferably 10 to 200 nm.
The liquid crystal alignment film of the present invention is preferably used as a liquid crystal alignment film for a liquid crystal display device of a transverse electric field system such as an IPS system or an FFS system, and is particularly useful as a liquid crystal alignment film for a liquid crystal display device of an FFS system.
< liquid crystal display element >
In the liquid crystal display device of the present invention, after a substrate having a liquid crystal alignment film formed from the liquid crystal alignment agent is obtained, a liquid crystal cell is produced by a known method, and the liquid crystal cell is used to produce the device.
An example of a method for manufacturing a liquid crystal cell will be described below, but the present invention is not limited thereto.
First, a set of substrates on which electrodes for driving liquid crystal are formed is prepared. The electrode may be, for example, an ITO electrode, and may be patterned so as to display a desired image. In addition, a conversion element such as a TFT (Thin Film Transistor) may be provided in each pixel portion constituting image display. A liquid crystal alignment film is formed on the substrate as described above.
Next, for example, an ultraviolet-curable sealing material is disposed at a predetermined position on one of the two substrates on which the liquid crystal alignment film is formed, liquid crystal is further disposed at predetermined several positions on the liquid crystal alignment film surface, and then the other substrate is bonded and pressure-bonded so that the liquid crystal alignment film faces each other, whereby the liquid crystal is spread over the front surface of the liquid crystal alignment film, and then ultraviolet rays are irradiated onto the entire surface of the substrate to cure the sealing material, thereby obtaining a liquid crystal cell.
In addition, as a step after forming the liquid crystal alignment film on the substrate, when a sealing material is disposed at a predetermined position on one substrate, an opening portion capable of being filled with liquid crystal from the outside is provided in advance, and after the substrates are bonded without disposing the liquid crystal, a liquid crystal material is injected into the liquid crystal cell through the opening portion provided in the sealing material, and then the opening portion is sealed with an adhesive to obtain a liquid crystal cell. The liquid crystal material may be injected by a vacuum injection method or a method using a capillary phenomenon in the atmosphere.
In any of the above methods, in order to secure a space for filling the liquid crystal material in the liquid crystal cell, the following method is preferably used: a method of providing columnar protrusions on one substrate, a method of dispersing spacers on one substrate, a method of mixing spacers into a sealing material, or a method of combining these methods.
As the liquid crystal material, nematic liquid crystal (nematic liquid crystal) and smectic liquid crystal (smectic liquid crystal) can be cited, and among them, nematic liquid crystal is preferable, and either of positive type liquid crystal material and negative type liquid crystal material can be used. Next, the polarizing plate was disposed. Specifically, a pair of polarizing plates is preferably attached to the surfaces of the two substrates opposite to the liquid crystal layer.
[ examples ]
The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples. The following compounds and solvents are abbreviated as follows.
NMP: n-methyl-2-pyrrolidone, BCS: butyl cellosolve.
CA-1 to CA-4: compounds of the following structural formulae, DA-1 to DA-6, respectively: are respectively compounds of the following structural formula.
AD-1: 3-glycidoxypropyltriethoxysilane, AD-2: a compound of the following structural formula.
[ measurement of viscosity ]
The viscosity of the polymer solution was measured at 25 ℃ using an E-type viscometer TVE-22H (manufactured by Toyobo industries Co., Ltd.), a sample volume of 1.1mL, and a conical rotor TE-1 (1 ℃ C., 34', R24).
< Synthesis of Polymer >
(Synthesis example 1)
2.86g (10.0mmol) of DA-1, 1.47g (6.0mmol) of DA-2 and 1.59g (4.0mmol) of DA-3 were weighed into a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen introduction tube, 53.2g of NMP was added thereto, and the mixture was dissolved by stirring while feeding nitrogen. While this diamine solution was stirred under water cooling, 4.20g (19.3mmol) of CA-1 and 21.0g of NMP were added, and the mixture was stirred at 50 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution A-1 (concentration: 12.0 mass%, viscosity: 496 mPas).
(Synthesis example 2)
In a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen inlet tube, 3.19g (16.0mmol) of DA-4 and 0.79g (4.0mmol) of DA-5 were weighed, and 49.0g of NMP was added and dissolved with stirring while feeding nitrogen. While the diamine solution was stirred under water cooling, 2.59g (13.2mmol) of CA-2 was added, and 13.9g of NMP was further added, followed by stirring at 23 ℃ for two and half hours under a nitrogen atmosphere. Then, while stirring the solution under water cooling, 1.20g (4.0mmol) of CA-3 and further 7.0g of NMP were added, and the mixture was stirred at 23 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution B-1 (concentration: 10.0 mass%, viscosity: 165 mPas).
(Synthesis example 3)
In a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen inlet tube, 3.67g (18.4mmol) of DA-4 and 0.70g (4.6mmol) of DA-6 were weighed, 26.8g of NMP was added, and the mixture was dissolved by stirring while feeding nitrogen. While the diamine solution was stirred under water cooling, 2.94g (15.0mmol) of CA-2 and further 14.5g of NMP were added, and the mixture was stirred at 23 ℃ for 30 minutes under a nitrogen atmosphere. Then, while stirring the solution under water cooling, 1.44g (5.8mmol) of CA-4 and further 8.2g of NMP were added, and the mixture was stirred at 50 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution B-2 (concentration: 15.0 mass%, viscosity: 352 mPas).
(Synthesis example 4)
In a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen inlet tube, 3.19g (16mmol) of DA-4 and 0.79g (4mmol) of DA-5 were weighed, 54.4g of NMP was added, and the mixture was dissolved by stirring while feeding nitrogen. While the diamine solution was stirred under water cooling, 0.90g (4.6mmol) of CA-2 was added, and further 15.5g of NMP was added, followed by stirring at 23 ℃ for 30 minutes under a nitrogen atmosphere. Then, while stirring the solution under water cooling, 3.75g (15.0mmol) of CA-4 and further 7.8g of NMP were added, and the mixture was stirred at 50 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution B-3 (concentration: 10.0 mass%, viscosity: 218 mPas).
(Synthesis example 5)
5.73g (20.0mmol) of DA-1 was weighed into a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen inlet tube, 56.9g of NMP was added thereto, and the mixture was dissolved by stirring while feeding nitrogen. While the diamine solution was stirred under water cooling, 3.97g (18.2mmol) of CA-1 and 14.2g of NMP were added, and the mixture was stirred at 50 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution C-1 (concentration: 12.0 mass%, viscosity: 505 mPas).
(Synthesis example 6)
4.13g (14.4mmol) of DA-1 and 1.43g (3.6mmol) of DA-3 were weighed into a 100mL eggplant-shaped flask equipped with a stirrer and a nitrogen introduction tube, 53.3g of NMP was added, and the mixture was dissolved by stirring while feeding nitrogen. While the diamine solution was stirred under water cooling, 3.53g (16.2mmol) of CA-1 and 13.3g of NMP were added, and the mixture was stirred at 50 ℃ for 12 hours under a nitrogen atmosphere to obtain a polymer solution C-2 (concentration: 12.0 mass%, viscosity: 498 mPas).
< preparation of liquid Crystal Aligning agent >
Example 1
The polymer solution a-1 and the polymer solution B-1 were used in a mass ratio of two polymers of 30: 70, Polymer solution A-1 (7.5g) was mixed with polymer solution B-1 (21.0 g). NMP (5.1g), BCS (12.5g), an NMP solution (3.0g) containing 1 wt% AD-1, and an NMP solution (0.9g) containing 10 wt% AD-2 were added to the mixture while stirring, and the mixture was further stirred at room temperature for 2 hours to obtain a liquid crystal aligning agent of the present invention.
Examples 2 and 3 and comparative examples 1 to 4
Liquid crystal aligning agents of examples 2 and 3 of the present invention and liquid crystal aligning agents of comparative examples 1 to 4 were obtained in the same manner as in example 1, with the compositions shown in table 1 below.
[ Table 1]
< production of liquid Crystal cell >
Using the liquid crystal aligning agent obtained in the above manner, an FFS-driven liquid crystal cell shown below was produced.
[ constitution of FFS-driven liquid Crystal cell ]
In a liquid crystal cell for Fringe Field Switching (FFS) mode, a set of a first glass substrate having an fop (finger on plate) electrode layer formed on the front surface thereof and including a common electrode, an insulating layer, and a comb-teeth-shaped pixel electrode is formed on the front surface thereof, and a second glass substrate having a column spacer with a height of 4 μm on the front surface thereof and including an ITO film for preventing electrification on the back surface thereof. The pixel electrode has a comb-tooth shape in which a plurality of electrode elements each having a width of 3 μm and a central portion bent at an inner angle of 160 ° are arranged in parallel at intervals of 6 μm, and one pixel has a first region and a second region with a line connecting bent portions of the plurality of electrode elements as a boundary.
The liquid crystal alignment film formed on the first glass substrate is subjected to alignment treatment so that a direction bisecting the internal angle of the pixel flexure is orthogonal to the alignment direction of the liquid crystal, and the liquid crystal alignment film formed on the second glass substrate is subjected to alignment treatment so that the alignment direction of the liquid crystal on the first substrate coincides with the alignment direction of the liquid crystal on the second substrate when the liquid crystal cell is manufactured.
[ production sequence of liquid Crystal cell ]
The liquid crystal aligning agent filtered through a filter having a pore size of 1.0 μm was applied to the surfaces of the glass substrates of the above-mentioned group by spin coating, and dried on a hot plate at 80 ℃ for 2 minutes. Then, the resulting film was baked in a hot air circulating oven at 230 ℃ for 30 minutes to obtain a substrate with a liquid crystal alignment film having a film thickness of 100 nm. The surface of the substrate with the liquid crystal alignment film was brushed with rayon cloth (YA-20R, manufactured by Giken chemical Co., Ltd.), and then cleaned by ultrasonic wave irradiation in pure water for 1 minute (roll diameter: 120mm, roll rotation speed: 1000rpm, moving speed: 20mm/sec, pressing length: 0.4mm), and after removing water droplets by air blowing, the substrate was dried at 80 ℃ for 15 minutes to obtain a substrate with a liquid crystal alignment film.
Next, a sealant was printed on one of the substrates with the liquid crystal alignment film of the above-described group, and the substrates were bonded so that the other substrates were opposed to the liquid crystal alignment film surface and the brushing directions thereof were antiparallel to each other, and the sealant was cured to produce a void cell. Liquid crystal MLC-3019 (manufactured by MERCK) was injected into the empty cell by a reduced pressure injection method, and the injection port was sealed, thereby obtaining an FFS-driven liquid crystal cell. Then, the resulting liquid crystal cell was heated at 120 ℃ for 1 hour, and placed evening out for various evaluations.
< evaluation of characteristics of liquid Crystal cell >
The characteristics of the liquid crystal cells produced in the above were evaluated as follows.
[ amount of accumulated charge ]
In the FFS-driven liquid crystal cell manufactured as described above, the LED backlight was irradiated from below the two polarizing plates disposed so that the polarization axes were orthogonal to each other, in a state where the pixel electrode and the counter electrode were short-circuited and were at the same potential, and the angle of the liquid crystal cell was adjusted so that the luminance of the LED backlight transmitted light measured by the two polarizing plates was minimized. This evaluation was performed under a temperature condition in which the temperature of the liquid crystal cell was 23 ℃.
Next, while applying an ac voltage having a frequency of 30Hz to the liquid crystal cell, a V-T curve (voltage-transmittance curve) was measured, and ac voltage values at which the relative transmittances were 23% and 100% were calculated as the driving voltage. Next, in order to eliminate the influence of electrification, an alternating voltage having a frequency of 1kHz and 20mV for 30 minutes was applied to the liquid crystal cell at 23 ℃.
Then, an ac voltage having a relative transmittance of 100% was applied for 45 minutes, and the amount of change from the start of measurement to 45 minutes after was calculated as the charge accumulation amount while measuring the minimum offset voltage value every 3 minutes. The minimum offset voltage value is a dc voltage value at which flicker is minimum by measuring a V-F curve (voltage-flicker curve) when an ac voltage having a relative transmittance of 23% is applied. The reason why the ac voltage having a relative transmittance of 23% is used is that the ac voltage value corresponds to a region where the change in luminance with respect to voltage is large, and therefore it is suitable to evaluate the accumulated charge through the luminance.
The accumulated charge affects display as a disturbance or an afterimage of the liquid crystal alignment, and the display quality level of the liquid crystal element is significantly lowered, so that it can be said that the amount of accumulated charge generated during driving is preferably small. Specifically, when the charge accumulation amount is less than 100mV, the evaluation is "o", and when the charge accumulation amount is 100mV or more, the evaluation is "x".
[ relaxation characteristics of accumulated Charge ]
In the FFS-driven liquid crystal cell manufactured as described above, the LED backlight was irradiated from below the two polarizing plates disposed so that the polarization axes were orthogonal to each other, in a state where the pixel electrode and the counter electrode were short-circuited and were at the same potential, and the angle of the liquid crystal cell was adjusted so that the luminance of the LED backlight transmitted light measured by the two polarizing plates was minimized. This evaluation was performed under a temperature condition in which the temperature of the liquid crystal cell was 23 ℃. In order to eliminate the influence of electrification, the liquid crystal cell was evaluated after applying an alternating voltage of 1kHz and 20mV at a frequency of 30 minutes to the liquid crystal cell.
Then, while an ac voltage having a frequency of 30Hz was applied to the liquid crystal cell, a V-T curve (voltage-transmittance curve) was measured, and an ac voltage value at which the relative transmittance became 23% was calculated as a driving voltage. Since the ac voltage value corresponds to a region where the change in luminance with respect to voltage is large, it is suitable to evaluate the accumulated charge through the luminance.
Then, after applying an alternating voltage having a frequency of 30Hz at which the relative transmittance becomes 23% for 5 minutes, a direct voltage of +1.0V was superimposed thereon, and the resultant was driven for 30 minutes. Then, the dc voltage was cut off, and an ac voltage having a frequency of 30Hz and a relative transmittance of 23% was applied again for only 30 minutes.
Since the faster the relaxation of the accumulated charge is, the faster the charge is accumulated in the liquid crystal cell when the dc voltage is superimposed, the relaxation characteristics of the accumulated charge were evaluated in the time required for the relative transmittance immediately after the dc voltage is superimposed to decrease from a state of 30% or more to 23%. It can be said that the shorter the time, the better the relaxation property of the accumulated charge. Specifically, the time from the time point when the application of the dc voltage was started until 30 minutes elapsed was expressed as a numerical value in which the relative transmittance was reduced to 30% or less. When the relative transmittance was decreased to 30% or less in less than 20 minutes, the evaluation was "o", and when the relative transmittance was 20 minutes or more, the evaluation was "x".
[ residual image characteristics based on long-term AC drive ]
The FFS-driven liquid crystal cell fabricated as described above was applied with an ac voltage of 60Hz ± 5V at a frequency of 120 hours in a constant temperature environment of 60 ℃. Then, the pixel electrode and the counter electrode of the liquid crystal cell were short-circuited, and left as they were at room temperature for one day.
In the liquid crystal cell subjected to the above-described processing, the deviation between the alignment direction of the liquid crystal in the first region and the alignment direction of the liquid crystal in the second region of the pixel in the voltage-non-applied state is calculated as an angle.
Specifically, a liquid crystal cell is disposed between two polarizing plates arranged so that the polarization axes are orthogonal to each other, the backlight is turned on, the arrangement angle of the liquid crystal cell is adjusted so that the transmission light intensity in the first region of the pixel becomes minimum, and then the rotation angle required for rotating the liquid crystal cell so that the transmission light intensity in the second region of the pixel becomes minimum is obtained.
It can be said that the smaller the value of the rotation angle, the better the afterimage characteristics by the long-term ac drive. Specifically, the evaluation was "o" when the rotation angle was less than 0.5 degrees, and "x" when the rotation angle was 0.5 degrees or more.
[ Voltage holding ratio ]
In the FFS-driven liquid crystal cell produced as described above, the voltage holding ratio (%) from the start of application release to 1667 msec was measured at 60 ℃. Specifically, when the voltage holding ratio was 95% or more, the evaluation was "o", and when the voltage holding ratio was less than 95%, the evaluation was "x".
< evaluation result >
The evaluation results of the liquid crystal cells using the liquid crystal aligning agents of the examples and comparative examples are shown in table 2 below.
[ Table 2]
Therefore, the following steps are carried out: the liquid crystal display element using the liquid crystal aligning agent of the invention has a small charge accumulation amount and good relaxation characteristics of the accumulated charge.
All the contents of the specification, claims, drawings and abstract of japanese patent application No. 2018-229216, filed on 12/6/2018, are incorporated herein by reference as disclosure of the specification of the present invention.
Claims (11)
1. A liquid crystal aligning agent comprising a polymer A and a polymer B,
the polymer A is a polymer obtained by the reaction of a tetracarboxylic acid derivative component with a diamine component comprising a diamine represented by the following formula (1) and a diamine represented by the following formula (2),
the polymer B is a polymer obtained by the reaction of a tetracarboxylic acid derivative component and a diamine component containing at least one of the diamines represented by the following formula (3),
H2N-Y2-NH2 (3)
in the formula, Y2Is a divalent organic group having a nitrogen atom or a nitrogen-containing aromatic heterocyclic ring bonded to an aromatic group.
2. The liquid crystal aligning agent according to claim 1,
the diamine component in the polymer A and/or the polymer B further contains at least one diamine represented by the following formula (4),
in the formula, Y1Represents a divalent organic group, and each of the two R's independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.
3. The liquid crystal aligning agent according to claim 2,
the diamine component in the polymer A contains: y in the formula (4)1A diamine which is a divalent organic group having a structure represented by the following formula (5),
wherein D represents a protecting group which is released by heating and substituted with a hydrogen atom, and represents a bonding site to another structure.
4. The liquid crystal aligning agent according to any one of claims 1 to 3,
the diamine residue derived from the diamine of formula (1) in the polymer A is 10 mol% or more of all the diamine residues of the polymer A, and the diamine residue derived from the diamine of formula (2) is 30 mol% or more of all the diamine residues of the polymer A.
5. The liquid crystal aligning agent according to any one of claims 1 to 4,
the content of the polymer A is 10 to 50 mass% and the content of the polymer B is 90 to 50 mass% with respect to the total amount of the polymer A and the polymer B.
6. The liquid crystal aligning agent according to any one of claims 1 to 5,
the liquid crystal aligning agent is used for a liquid crystal display element of a transverse electric field driving mode.
7. The liquid crystal aligning agent according to any one of claims 1 to 6,
the horizontal electric field driving method is an FFS driving method.
8. A liquid crystal alignment film obtained from the liquid crystal aligning agent according to any one of claims 1 to 7.
9. A liquid crystal display element having the liquid crystal alignment film according to claim 8.
10. The liquid crystal display element according to claim 9,
the liquid crystal display element is in a transverse electric field driving mode.
11. The liquid crystal display element according to claim 9,
the liquid crystal display element adopts an FFS driving mode.
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| KR20240032874A (en) | 2021-07-12 | 2024-03-12 | 닛산 가가쿠 가부시키가이샤 | Liquid crystal alignment agent, liquid crystal alignment film, manufacturing method of liquid crystal display device, and liquid crystal display device |
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| JP2014044397A (en) * | 2012-08-03 | 2014-03-13 | Jsr Corp | Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element and method for manufacturing liquid crystal alignment film |
| JP2017146595A (en) * | 2016-02-15 | 2017-08-24 | 日産化学工業株式会社 | Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display |
| WO2018062440A1 (en) * | 2016-09-29 | 2018-04-05 | 日産化学工業株式会社 | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
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| KR102241791B1 (en) * | 2013-10-23 | 2021-04-16 | 닛산 가가쿠 가부시키가이샤 | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
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| JP2014044397A (en) * | 2012-08-03 | 2014-03-13 | Jsr Corp | Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element and method for manufacturing liquid crystal alignment film |
| JP2017146595A (en) * | 2016-02-15 | 2017-08-24 | 日産化学工業株式会社 | Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display |
| WO2018062440A1 (en) * | 2016-09-29 | 2018-04-05 | 日産化学工業株式会社 | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
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