CN104098496B - Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof - Google Patents
Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof Download PDFInfo
- Publication number
- CN104098496B CN104098496B CN201310201267.2A CN201310201267A CN104098496B CN 104098496 B CN104098496 B CN 104098496B CN 201310201267 A CN201310201267 A CN 201310201267A CN 104098496 B CN104098496 B CN 104098496B
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- CN
- China
- Prior art keywords
- liquid crystal
- aligning agent
- polyamic acid
- crystal aligning
- solvent
- 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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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 100
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 32
- 239000013078 crystal Substances 0.000 claims description 51
- 239000000758 substrate Substances 0.000 claims description 45
- 229920005575 poly(amic acid) Polymers 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 41
- 229920000642 polymer Polymers 0.000 claims description 26
- 239000004642 Polyimide Substances 0.000 claims description 19
- 229920001721 polyimide Polymers 0.000 claims description 19
- 150000004040 pyrrolidinones Chemical class 0.000 claims description 15
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 8
- 229920001577 copolymer Polymers 0.000 claims description 5
- 125000001183 hydrocarbyl group Chemical group 0.000 abstract description 10
- HNJBEVLQSNELDL-UHFFFAOYSA-N pyrrolidin-2-one Chemical compound O=C1CCCN1 HNJBEVLQSNELDL-UHFFFAOYSA-N 0.000 abstract description 3
- 210000004027 cell Anatomy 0.000 description 25
- 239000000463 material Substances 0.000 description 16
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- 238000006243 chemical reaction Methods 0.000 description 15
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- 239000007787 solid Substances 0.000 description 9
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- 239000000243 solution Substances 0.000 description 6
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- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
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- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical class OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 150000003949 imides Chemical class 0.000 description 1
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- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/267—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3415—Five-membered rings
-
- 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
-
- 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
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133325—Assembling processes
Abstract
The invention provides a liquid crystal alignment agent, a liquid crystal alignment film, a liquid crystal display element and a manufacturing method thereof. The liquid crystal aligning agent includes: a solvent comprising pyrrolidone represented by formula 1Formula 1, wherein R is C3‑C12A branched hydrocarbon group.
Description
Technical field
The present invention relates to contain pyrrolidones in a kind of crystal aligning agent, more particularly to a kind of solvent（pyrrolidone）
Crystal aligning agent, the liquid crystal orienting film that is made using this crystal aligning agent, and the liquid crystal including the liquid crystal orienting film
Show element and its manufacture method.
Background technology
Liquid crystal display（liquid crystal display）It is the display using the photoelectric property of liquid crystal, it has
Small volume, lightweight, low power consumption and the attracting advantage such as display quality is good, have turned into the master of flat-panel screens in recent years
Stream.
With the expansion of picture dimension, the high saturation, high-contrast to color and the requirement to reaction speed high, liquid crystal
Display is by twisted nematic（Twisted Nematic,TN）It is developed to STN Super TN（Super Twisted Nematic,
STN）, membrane transistor is all housed in developing deeply to each picture element（Thin Filmed Tansistor,TFT）TFT types show
Show element.The type of drive persistently to TFT type display elements is improved in recent years, in terms of visual angle is improved, is developed vertical
Orientation（Vertical Alignment,VA）Mode or transverse electric field effect（In-Plane Switching,IPS）Mode, this
Outward, the optical compensation for also developing the reaction speed that can improve correspondence animation is curved（Optically Compensated Bend,OCB）
Mode.
In LCD element, typical liquid crystal cell is twisted nematic（TN）Field effect mode liquid crystal cell, its
Use the nematic liquid crystal with positive dielectric anisotropy.In general, between liquid crystal molecule inserts a pair substrates containing electrode, this two
The alignment direction of individual substrate is mutually perpendicular to, via the arrangement mode of the controllable liquid crystal molecule of control electric field.With regard to the liquid crystal of this type
For display device, it is quite heavy to allow the long axis direction of liquid crystal molecule and substrate surface to have the orientation of uniform pitch angle
Want, and Liquid Crystal Molecules Alignment into uniform tilt angle can be made（pre-tilt angle,PTA）The material of orientation is referred to as alignment film
（alignment film）.
Current industrial quarters has two kinds of typical orientation membrane preparation methods.First method is by inorganic matter by vapor deposition
Matter is made inoranic membrane.Second method is then that organic film is coated with the surface of the substrate, then using cotton, nylon or polyesters
Soft cloth friction is oriented to organic film so that liquid crystal molecule is able to along frictional direction orientation.Because the method is simpler
And the relatively easy uniform orientation of acquisition, therefore it is widely used in commercial scale.The polymer that organic alignment film can be formed for example gathers
Vinyl alcohol（polyvinyl alcohol,PVA）, polyoxyethylene（polyethylene oxide,PEO）, polyamic acid
（polyamide acid,PAA）Or polyimides（polyimide,PI）, wherein polyimides due to chemical stability and
The properties such as thermostability, are most often utilized as the material of alignment film.
Wherein, because polyimides and polyamic acid are to the solubility extreme difference of water, therefore usually using N- crassitudes
Ketone（NMP）As solvent, however, the hygroscopicity of 1-METHYLPYRROLIDONE is high, therefore in coating process, can because polyimides or
Polyamic acid solubility is not good in itself or orientation agent in open up that film is uneven even to be separated out containing excess moisture, and cannot obtain
Even good liquid crystal orienting film.
The content of the invention
The present invention provides a kind of crystal aligning agent, and it provides good printing, and with good electrical properties with
The characteristics such as resistance to water soak.
The present invention separately provides a kind of liquid crystal orienting film, and it is made by foregoing liquid crystal orientation agent, in different process conditions
Under can also maintain good pre-dumping angle stability.
The present invention provides a kind of liquid crystal display cells again, and it includes foregoing liquid crystal alignment film, therefore is kept with high voltage
The effects such as rate, and then reach the purpose for promoting liquid crystal display cells efficiency.
The present invention provides a kind of manufacture method of liquid crystal display cells again, can manufacture dynamical liquid crystal display cells.
The present invention proposes a kind of crystal aligning agent, including solvent, and the solvent includes the pyrrolidones represented by formula 1
（pyrrolidone）
Formula 1, wherein R are C3-C12Branched hydrocarbyl.
In one embodiment of this invention, R is C3-C8Branched hydrocarbyl.
In one embodiment of this invention, R is C3-C5Branched hydrocarbyl.
In one embodiment of this invention, R is alkyl.
In one embodiment of this invention, the pyrrolidones for being represented by formula 1 in a solvent proportion be 0.5 weight %~
90 weight %.
In one embodiment of this invention, the pyrrolidones for being represented by formula 1 in a solvent proportion be 0.5 weight %~
50 weight %.
In one embodiment of this invention, crystal aligning agent also includes polymer, and aforementioned polymer includes polyimides, gathers
The copolymer or polyimides and the mixture of polyamic acid of amic acid, polyimides and polyamic acid.
The present invention separately proposes a kind of liquid crystal orienting film, it is characterised in that：Base is applied to by by foregoing crystal aligning agent
It is obtained on plate.
The present invention proposes a kind of liquid crystal display cells, including foregoing liquid crystal orienting film again.
The present invention reintroduces a kind of manufacture method of liquid crystal display cells, including：Foregoing crystal aligning agent is applied to
Substrate, then forms liquid crystal orienting film to substrate heated baking.
Based on above-mentioned, crystal aligning agent of the invention, it is by including with C3-C12The pyrrolidinone compounds of branched hydrocarbyl are molten
Agent, not only can dissolve well the polymer such as polyimides, polyamic acid, polyamide and poly amic acid ester, while can also reduce
Hygroscopicity and lifting coating.Therefore, the liquid crystal orienting film of the invention being made up of foregoing liquid crystal orientation agent can remain good
Pre-dumping angle stability.Thus, the liquid crystal display cells of the invention with this liquid crystal orienting film be able to high voltage holding ratio,
Excellent display quality and short reaction time.
It is that features described above of the invention and advantage can be become apparent, special embodiment below, and it is detailed to coordinate accompanying drawing to make
Carefully it is described as follows.
Brief description of the drawings
Fig. 1 is that experimental example of the invention 2 becomes with the liquid crystal display cells of comparative example 1 in the tilt angle under different heating processing procedure
Change schematic diagram.
Specific embodiment
Embodiment will be below enumerated to further illustrate various aspects of the invention.In this manual, if without spy
Whether a certain group is not indicated by substitution, then the group can represent the group for being substituted or being unsubstituted.For example, " alkyl " can
The alkyl that expression is substituted or is unsubstituted.In addition, to a certain group titled with " CX" to describe when, represent the group main chain tool
There is X carbon atom.
Herein, the structure of compound is sometimes with key wire type（skeleton formula）Represent.This representation can
To omit carbon atom, hydrogen atom and C-H bond.Certainly, have in structural formula and clearly draw functional group, be then defined by shower.
In this manual, the scope for being represented by " numerical value to another numerical value ", is that one kind is avoided in the description one by one
The summary representation of all numerical value enumerated in the scope.Therefore, to the description of a certain special value scope, it is intended to cover
Any number in the number range and the relatively fractional value scope defined by any number in the number range, just as
Write out any number in plain text in the description and be somebody's turn to do as compared with fractional value scope.For example, the model of " temperature is 80 °C~300 °C "
Enclose, no matter whether enumerate other numerical value in specification, cover the scope of " temperature is 100 °C~250 °C ".
The first embodiment of the present invention provides a kind of crystal aligning agent, including：Comprising the pyrrolidinone compounds represented by formula 1
Solvent.Wherein, the poly- amine polymer such as the solvent of pyrrolidinone compounds polyimide/polyamide acid poor for solubility also has
There is good dissolubility.
Formula 1.
In the present embodiment, R is, for example, C3-C12Branched hydrocarbyl.In general, the carbon number of R is higher, then resistance to water soak is healed
It is good, but molecule contacts area and molecule and intermolecular Fan Dewali（Van der Waals force）Also it is bigger, thus
Boiling point（Boiling Point）Also it is higher.If R is alkyl of the carbon number more than 12, boiling point is too high, cause solvent not volatile or
Rate of volatilization is not suitable for low temperature process common at present relatively slowly；If R is alkyl of the carbon number less than 3, resistance to water soak is not good,
Coating is not also good.Additionally, inventor find, compared to straight-chain alkyl, branched hydrocarbyl have by carbon number improve and lifted
Contribute to the increased not expected property of solubility while resistance to water soak.Consider factors above, preferably R for example
It is C3-C8Branched hydrocarbyl, more preferably R are, for example, C3-C5Branched hydrocarbyl.
In the present embodiment, R can be alkyl.In due to the alkyl of same carbon number, the boiling point of alkyl is relatively low, thus can be preferable
Ground is in low temperature process.Specifically, R can for example enumerate isopropyl, new butyl, isobutyl group etc..That is, in the present embodiment
In, the solvent of the pyrrolidinone compounds represented by formula 1 for example can specifically enumerate the new butyl -2- pyrroles of N- isopropyls -2-Pyrrolidone, N-
Pyrrolidone, N- isobutyl groups -2-Pyrrolidone（Respectively such as following formula 1a, formula 1b, formula 1c）Deng.
In the present embodiment, from from the viewpoint of viscosity and volatility, the solids content of crystal aligning agent（It is non-in constituent
Ratio shared by volatile materials）Preferably 1 weight %~10 weight %.If the solids content of crystal aligning agent is less than 1 weight %,
The thickness of the liquid crystal orienting film for then being formed by coating of liquid crystalline orientation agent is too thin, reduces LCD alignment；If crystal aligning agent
Solids content is higher than 10 weight %, then can influence to be coated with quality.
In the present invention, the solid content of crystal aligning agent for example includes polymer, and the polymer can be with liquid
Any one polymer of brilliant orientation effect.In the present embodiment, the polymer is, for example, polyimides, polyamic acid, gathers
Mixture of copolymer or polyimides and polyamic acid of acid imide and polyamic acid etc..In the present embodiment, polyimides,
Polyamic acid is, for example, to be obtained by diamines and tetracarboxylic dianhydride's reaction, and the copolymer and mixture are, for example, sub- polyamides
The copolymer or mixture of the arbitrary proportion of both amine, polyamic acid.More specifically, e.g. by monoamine compound, four
Carboxylic acid dianhydride carries out polymerisation with diamine compound in organic solvent, and carries out part cyclization by dehydration, and
Obtain polyimides-polyamic acid product.To be below described in more detail.
＜ diamine compounds ＞
Diamine compound used in the present embodiment is not particularly limited, and one or more two aminations can be used
Compound.Instantiation as shown in Table 1, but is not limited.
Table one
Then also can be isomeric compound or its mixing of this little compound if can have isomeric compound person in above-claimed cpd
Thing.
＜ tetracarboxylic dianhydride's compounds ＞
Tetracarboxylic dianhydride's compound used in the present embodiment is not particularly limited, and one or more can be used
Tetracarboxylic dianhydride's compound.Specific example as shown in Table 2, but is not limited.
Table two
Then also can be isomeric compound or its mixing of this little compound if can have isomeric compound person in above-claimed cpd
Thing.
The synthesis ＞ of ＜ polyimides-polyamic acid
In the present embodiment, the tetracarboxylic dianhydride of the synthetic reaction of polyimides-polyamic acid and the ratio of diamines are used in
Example is, for example, and in terms of the amido of the 1 equivalent diamines, the anhydride group content of tetracarboxylic dianhydride is 0.5 equivalent~2 equivalent, more preferably
0.7 equivalent~1.5 equivalent.
In the present embodiment, the synthesis of polyimides-polyamic acid is completed all in organic solvent, and used it is organic
Solvent is divided into solubility preferably organic solvent and the poor organic solvent of solubility.
The pyrrolidinone compounds for including being represented by formula 1 for polyimides-polyamic acid solubility preferably organic solvent
Solvent, such solvent can be used in mixed way it is two or more, also can simultaneously with following solvent：METHYLPYRROLIDONE, N- second
Base -2-Pyrrolidone, N,N-dimethylformamide, DMAC N,N' dimethyl acetamide, N- methyl caprolactams, dimethyl sulfoxide (DMSO), four
Methyl urea, hexamethyl phosphoramide, gamma-butyrolacton etc..Additionally, in the present embodiment, the pyrrolidones represented by formula 1 is in solvent
Middle proportion is preferably 0.5 weight %~90 weight %, is more preferably 0.5 weight %~50 weight %.If the pyrroles that will be represented by formula 1
Proportion is set to 0.5 weight %~50 weight % to alkanone in a solvent, then Solvent Solubility more preferably, and can improve making for levelling agent
Consumption.
Can also mix with aforementioned organic solvents and make for polyimides-poor organic solvent of polyamic acid solubility
With, but the premise for using can be still homogeneously dispersed in solvent for polyimides-polyamic acid.The poor solvent bag of solubility
Include：Methyl alcohol, ethanol, isopropanol, n-butanol, cyclohexanol, ethylene glycol, ethylene glycol single methyl ether, ethylene glycol monomethyl ether, ethylene glycol
Single-butyl ether, ethylene glycol dimethyl ether, ethylene glycol Anaesthetie Ether, Anaesthetie Ether, acetone, methyl ethyl ketone, cyclohexanone, acetic acid first
Ester, ethyl acetate, tetrahydrofuran, dichloromethane, chloroform, 1,2- dichloroethanes, benzene,toluene,xylene, n-hexane, just
Heptane, normal octane etc..In view of the coating of crystal aligning agent, preferably using the solvent of low surface tension, for example：Ethylene glycol
Monomethyl ether, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether etc..Above solvent can also be used in mixed way two or more.
In the present embodiment, the formation of polyimides-polyamic acid is included through dehydration closed-loop reaction, and dehydration closed-loop reaction
For example can be by：
Method (1)：Directly heating carries out dehydration closed-loop reaction, and wherein reaction temperature is, for example, 50 °C~300 °C, and with
120 °C~230 °C more preferably.When reaction temperature is less than 50 °C, dehydration closed-loop reaction will not be carried out.
Method (2)：Add dehydrating agent and catalyst to carry out dehydration closed-loop reaction, wherein reaction temperature is, for example, -20 °C
~150 °C, and with 0 °C~120 °C more preferably.Dehydrating agent for example can be used the acid anhydrides such as acetic anhydride, propionic andydride, TFAA, take off
Depending on aqua consumption closed loop rate needed for, preferably relative to the reproducing unit of every 1 mole of polyimide-polyamic acid（I.e. one
The repeat unit of acid anhydrides and a diamine reactant）And use 0.01 mole~20 moles of dehydrating agent.Catalyst can for example make
With tertiary amines such as triethylamine, pyridine, lutidines, dehydrating agent consumption preferably relative to every 1 mole and use 0.01
Mole~10 moles of catalyst.
In the present embodiment, the way of purification of polyimides-polyamic acid is, for example,：By polyimides-polyamic acid
Reaction dissolvent is largely poured into the poor solvent of solubility and is precipitated thing, is then carried out drying under reduced pressure and can be obtained polyamides Asia
, then be dissolved in polyimides-polyamic acid in the poor organic solvent of solubility and precipitated again by amine-polyamic acid,
Multiple this step is carried out once or repeats to purify polyimides-polyamic acid.Finally, it is molten with solubility preferably solvent
Solution polyimides-polyamic acid.
Furthermore, in the present embodiment, optionally, crystal aligning agent for example can also include additive, such as organosilicon (oxygen)
Hydride compounds, epoxide etc..
In the present embodiment, organosilicon (oxygen) hydride compounds are not particularly limited, for example, can enumerate：Aminocarbonyl propyl three
Methoxy silane, aminocarbonyl propyl triethyl silicane, vinyl methyl silane, N- (2- amidos ethyl) -3- aminocarbonyl propyls methyl two
Methoxy silane, N- (2- amidos ethyl) -3- aminocarbonyl propyl trimethoxy silanes, VTES, 3- methyl-props
Alkene acryloxypropylethoxysilane trimethoxy silane, 3- glycidoxypropyltrime,hoxysilanes, 3- glycidoxypropyls two
Methoxy silane, 2- (3,4- epoxycyclohexyls) ethyl trimethoxy silane, 3- ureido-propyl trimethoxy silanes, 3- urea groups third
Ethyl triethoxy silicane alkane, N- carbethoxyl group -3- aminocarbonyl propyl trimethoxy silanes, the ethoxy of N- carbethoxyl group -3- aminocarbonyl propyls three
Base amine silane, N- triethoxysilylpropyltetrasulfides diethylenetriamine, N- trimethoxy-silylpropyls triethylene three
Double (epoxide the ethylidene) -3- aminocarbonyl propyl trimethoxy silanes of amine, N-, double (epoxide the ethylidene) -3- aminocarbonyl propyl triethyl groups of N-
Silane etc..
Content that can be by suitable control organosilicon (oxygen) hydride compounds in crystal aligning agent, and in not influenceing liquid crystal to match somebody with somebody
In the case of demand characteristics to film, and then improve adherence of the liquid crystal orienting film to substrate surface.If in crystal aligning agent
The content of organosilicon (oxygen) hydride compounds is excessive, and the liquid crystal orienting film for being formed is also easy to produce the bad phenomenon of orientation；If liquid crystal is matched somebody with somebody
Content to organosilicon (oxygen) hydride compounds in agent is very few, and the liquid crystal orienting film for being formed easily produces brush film bad and break flour
Excessive phenomenon.Therefore, in the present embodiment, relative to the gross weight of the polymer contained by crystal aligning agent, organosilicon (oxygen)
Hydride compounds concentration is preferably 0.01 weight %~5 weight %, more preferably 0.1 weight %~3 weight %.
In the present embodiment, epoxide is not particularly limited, for example, can enumerate：Ethylene glycol diglycidyl
Ether, propylene glycol diglycidylether, tripropyleneglycol diglycidyl ether, neopentylglycol diglycidyl ether, 1,6- hexane diols
Diglycidyl ether, glycerin diglycidyl ether, 2,2- dibromoneopentyl glycols diglycidyl ether, 1,3,5,6- tetra- shrink sweet
Oil -2,4- hexane diols, N, N, double (N, N- the 2-glycidyl amidos of N ', N '-four glycidyl group-m- benzene dimethylbenzene, 1,3-
Methyl) hexamethylene, N, N, N ', N '-four glycidyl group -4,4 '-two aminodiphenylmethane, 3- (N- pi-allyls-N- shrink it is sweet
Oil base) aminocarbonyl propyl trimethoxy silane, 3- (N, N- diglycidyl) aminocarbonyl propyl trimethoxy silane.
Content that can be by suitable control epoxide in crystal aligning agent, and in not influenceing the need of liquid crystal orienting film
In the case of seeking characteristic, and then improve adherence of the liquid crystal orienting film to substrate surface.If the epoxy compound in crystal aligning agent
The content of thing is excessive, and the liquid crystal orienting film for being formed is also easy to produce the bad phenomenon of orientation；If the epoxy compound in crystal aligning agent
The content of thing is very few, and the liquid crystal orienting film for being formed easily produces brush film bad and the excessive phenomenon of break flour.Therefore, in this implementation
In example, relative to crystal aligning agent gross weight, epoxide concentration is preferably 0.01 weight %~3 weight %, is more preferably 0.1 weight
Amount %~2 weight %.
The second embodiment of the present invention provides a kind of liquid crystal orienting film, it is characterised in that the liquid crystal orienting film is to pass through
Crystal aligning agent described in the first embodiment of the present invention is coated on substrate and firing is formed.
In general, the thickness of the liquid crystal orienting film formed by preceding method is preferably 0.005 μm~0.5 μm.Liquid crystal is matched somebody with somebody
To the thickness of film, it will usually the coating method of viscosity and crystal aligning agent according to crystal aligning agent and be adjusted.In addition, liquid
The thickness of brilliant alignment film, using segment difference meter and elliptical polarized light meter（ellipsometer）Carried out etc. common film thickness measuring device
Determine.
In the present embodiment, substrate can be used existing known any substrate, can preferably bear treatment conditions described later
Person.Can for example enumerate：Plastic substrate, glass epoxy substrate, glass substrate, ceramic substrate, metal substrate etc..
The material of plastic substrate can for example be enumerated：Thermosetting resin（Such as epoxy resin, phenol resin, polyimides tree
Fat, polyester resin etc.）, thermoplastic resin（Such as phenoxy resin, polyether sulfone, polysulfones, PPSU（Polyphenylene
sulfone）Deng）.
The material of ceramic substrate can for example be enumerated：Aluminum oxide, aluminium nitride, zirconium oxide, silicon, silicon nitride, carborundum etc..
The material of glass substrate can for example be enumerated：Soda-lime glass, potash glass, pyrex, quartz glass, manosil AS glass
Glass, lead glass etc..
The material of metal substrate can for example be enumerated：Aluminium, zinc, copper etc..
Additionally, substrate also can be the laminations such as above-mentioned plastic substrate, glass substrate, ceramic substrate, metal substrate
（laminate）More than 2 layers of structure.Certainly, also can be the substrate with patterned transparent conducting film.
Then, in the present embodiment, the method for coating can for example be enumerated：Roller rubbing method, method of spin coating, print process
Deng crystal aligning agent can be coated on substrate by these methods.
Furthermore, in the present embodiment, the mode of firing is, for example, heated baking, and the method for heated baking can for example be arranged
Lift：The method that is heated in baking oven or infrared heating heating furnace, in method heated on hot plate etc..By plus
Heat baking, can remove the organic solvent in crystal aligning agent, and promote the polyamic acid to carry out dehydration closed-loop reaction.In this reality
Apply in example, heated baking temperature is preferably 80 °C~300 °C, be more preferably 100 °C~240 °C, be most preferably 120 °C~220 °C.
The third embodiment of the present invention provides a kind of manufacture method of liquid crystal display cells, including：By of the invention first
Crystal aligning agent described in embodiment is applied to substrate, then forms liquid crystal orienting film to substrate heated baking.
First, in the present embodiment, substrate is, for example, substrate used for liquid crystal display element, and its material for example can be used this to send out
Cited material in bright second embodiment.Additionally, coating method and heated baking method can be used it is of the invention
Cited method in second embodiment, also can be used other common any methods.
Then, in the present embodiment, after heated baking forms liquid crystal orienting film, for example can be by being wound with nylon or cotton
The roller of fiber cloth is oriented friction（rubbing）, this liquid crystal orienting film is provided liquid crystal molecule distributing tropism.
Then, in the present embodiment, having in one be coated with frame glue on the substrate of foregoing liquid crystal alignment film, has in another
Separation material is sprayed on the substrate of foregoing liquid crystal alignment film, then two LCD alignment ilm substrates are hung down mutually with brush film direction each other
Straight or parallel to each other mode is combined, and liquid crystal, then sealing injection hole are therebetween injected in gap, and preliminarily forms liquid crystal display
Element.As for the follow-up processing procedure for completing liquid crystal display cells well known to those skilled in the art, repeated no more in this.
The fourth embodiment of the present invention provides a kind of liquid crystal display cells, and it is included described in the second embodiment of the present invention
Liquid crystal orienting film.In the present embodiment, the manufacture method of liquid crystal display cells for example can be used third embodiment of the present invention institute
The manufacture method of the liquid crystal display cells stated.
＜ tests ＞
More specific description is carried out to the present invention by comparative example and experimental example below, but the present invention is not limited to these
Experimental example.
The synthesis ＞ of ＜ polyamic acids
Synthesis example 1 and synthesis example 2
During diamines and tetracarboxylic dianhydride sequentially made an addition into METHYLPYRROLIDONE（Its chemical constitution and deal such as table
One and table three shown in）, the solution that solid constituent is 20 weight % is prepared, and in reaction 4 hours~6 hours under 40 °C~60 °C, and
Polyamic acid polymer is obtained, then again with to the poor solvent of polyamic acid polymer solubility（Such as methyl alcohol or water）Carry out pure
Change, and polymer A1 and polymer A2 are obtained by drying under reduced pressure.
Synthesis example 3 and synthesis example 4
During diamines and tetracarboxylic dianhydride sequentially made an addition into N- isopropyls -2-Pyrrolidone（Its chemical constitution is with deal such as
Shown in table one and table three）, the solution that solid constituent is 20 weight % is prepared, and in reaction 4 hours~6 hours under 40 °C~60 °C,
And polyamic acid polymer is obtained, then again with the solvent to polyamic acid polymer poor solubility（Such as methyl alcohol or water）Carry out pure
Change, and polymer A3 and polymer A4 are obtained by drying under reduced pressure.
Synthesis example 5
During diamines and tetracarboxylic dianhydride sequentially made an addition into METHYLPYRROLIDONE（As shown in Table 3）, prepare solid
Composition is the solution of 20 weight %, and in reaction 4 hours~6 hours under 40 °C~60 °C, and polyamic acid polymer is obtained, after
And add pyridine and acetic anhydride in the polyamic acid polymer of gained（Addition depends on polyimides ratio）, in 100 °
Carry out being dehydrated/ring-closure reaction 3 hours~4 hours under C~110 °C, the solution to gained is precipitated with methyl alcohol, and is entered with methyl alcohol
Row purifying, finally collects and obtains polymer B 1 by drying under reduced pressure.
Synthesis example 6
In synthesis example 6, in addition to N- isopropyls -2-Pyrrolidone substitution METHYLPYRROLIDONE（Such as the institute of table three
Show）, to be same as synthesis example 5 in the way of carry out, obtain polymer B 2.
Table three
It is dissolved in solvent by by polymer solids, prepares the solution that solids content is 6 weight %, and with 0.2 μm of diameter
Filter filtering, and collected filtrate is as crystal aligning agent.In crystal aligning agent, the composition of polymer solids with it is molten
The composition difference of agent is as shown in Table 4.It should be noted that in ＜ experiments ＞ parts, using polyamic acid as alignment film high score
Sub- material, first because polyamic acid is a kind of conventional alignment film material, second also in that the solubility of polyamic acid
It is poor.The solvent prepared in each experimental example was both verified suitable for polyamic acid, then be also applicable to other conventional alignment films
Material.
Crystal aligning agent is coated on glass substrate by roller printing machine, and is dried with 220 °C of heating plate
12 minutes, form the film that thickness is about 0.05 micron（That is liquid crystal orienting film）.Then there is foregoing liquid crystal alignment film in one
Substrate on be coated with frame glue, in separation material is sprayed on another substrate with foregoing liquid crystal alignment film, then by two LCD alignments
The substrate of film is combined in the mutually perpendicular mode in brush film direction each other, and therebetween in gap injects liquid crystal material（Merck companies
The ZLI-4792 of production）, then sealing injection hole, and form liquid crystal display cells.
It is estimated to stating evaluation method below the crystal aligning agent and liquid crystal display cells of gained.
＜ evaluation methods ＞
(1) coating of crystal aligning agent
(A) crystal aligning agent is applied to indium tin oxide with print process（Indium Tin Oxide, ITO）On substrate and pass through
Toasted by baking oven, whether observation face is smooth or whether there is color spot.It is judged as if without color spot good；Judge if having color spot
For bad.
(B) face edge membrane thickness unevenness area is measured（Hollow area）.It is excellent if less than 100 μm；If 100 μ
M~150 μm are then can；It is poor if higher than 150 μm.
(2) albinism of crystal aligning agent
Crystal aligning agent is applied on ito substrate with print process, is toasted after standing 10 minutes, seen with light microscope
Examine the phenomenon for whether having precipitation.It is zero if without separating out；It is X if having precipitation.
(3) tilt angle is in the stability of different process conditions
Crystal aligning agent is applied on ito substrate with print process, and baking 12 is carried out with 200 °C or 220 °C via baking oven
Minute or 25 minutes, constitute liquid crystal display cells（Liquid crystal material：The ZLI-4792 of Merck companies production）, rotated by crystallization
The tilt angle at method measuring element center.Result is as shown in Figure 1.
(4) the brush film of alignment film
Crystal aligning agent is applied on ito substrate with print process, and is toasted via baking oven, continued with rotating speed 1000（Turn/
Point）, platform translational speed 60（Mm/second）, give as security into amount 0.6mm to be oriented brush film, and visually seen by petrographic microscope
Examine whether the surface after brush film has scratch or chip.
(5) voltage retention
Measuring condition：Under 60 °C of environment temperatures, by alternating current（5V, 60Hz, pulse 60 μ sec wide）Put on liquid crystal
Show element, and measure the voltage retention of liquid crystal display cells.If more than 90% is then good；If less than 90% then for not
It is good.
Above evaluation result is embedded in table four.
Table four
In table four, a is gamma-butyrolacton, b is butyl cellosolve, c is METHYLPYRROLIDONE, d is N- ethyls -2-
Pyrrolidones, e are N- isopropyls -2-Pyrrolidone, f is the new butyl -2-Pyrrolidones of N-.
By table four as can be seen that crystal aligning agent coating of the invention is splendid, and the liquid crystal orienting film for being formed is not
Only face it is smooth, without color spot, face edge is also excellent.Additionally, albinism will not also occur after baking.Furthermore, it is of the invention
Liquid crystal display cells are not only maintaining good voltage retention, while also having excellent brush film.
Liquid crystal display cells to embodiment 2 and comparative example 1 measure the tilt angle of different heating processing procedure, the results are shown in
Fig. 1.The change of the tilt angle of liquid crystal display cells of the invention is within 0.5 degree as shown in Figure 1, that is, understands liquid of the invention
Crystal display element has quite good pre-dumping angle stability, the temperature conditionss operating range of heat treatment（working window）
It is larger, therefore suitable for the processing procedure of various liquid crystal display cells.
In sum, the present invention discloses a kind of crystal aligning agent and its liquid crystal orienting film and including this liquid crystal orienting film
Liquid crystal display cells and its manufacture method.This crystal aligning agent is due to including comprising pyrrolidones（This pyrrolidones has C3-
C12Branched hydrocarbyl）Solvent, it is therefore not only good to the solubility and hold capacity of polyimides, polyamic acid etc., also have
Relatively low hygroscopicity and boiling point, thus can lift coating and cause that printing non-uniform areas reduce, and be easy to compared with
Good face is still can obtain under low temperature process.So as to thus the liquid crystal orienting film manufactured by crystal aligning agent is in different processing procedures
Condition（Such as temperature, time）There is down good pre-dumping angle stability, and splendid brush film is also provided.Thus, including
The liquid crystal display cells of this liquid crystal orienting film have can maintain good voltage retention, the short reaction time, big contrast,
The characteristics such as longer life.Sum it up, present invention can apply to liquid crystal display cells such as TN, STN, VA, IPS.More generally,
Present invention can apply to the display such as wrist-watch, mobile phone, industrial liquid crystal panel, computer screen, notebook computer, LCD TV
Device.
Although the present invention is disclosed as above with embodiment, it is not limited to the present invention, any art
In technical staff, without departing from the spirit and scope of the present invention, when appropriate change and equal replacement can be made, therefore of the invention
The scope that should be defined by claim of protection domain be defined.
Claims (7)
1. a kind of crystal aligning agent, it is characterised in that including：
Solvent, the solvent includes the pyrrolidones represented by formula 1；And
Polymer, the polymer is the copolymer or polyimides of polyimides, polyamic acid, polyimides and polyamic acid
With the mixture of polyamic acid,
Wherein R is C3-C12Branched alkyl,
The pyrrolidones for wherein being represented by formula 1 proportion in the solvent is 0.5 weight %~90 weight %.
2. crystal aligning agent according to claim 1, it is characterised in that R is C3-C8Branched alkyl.
3. crystal aligning agent according to claim 1, it is characterised in that R is C3-C5Branched alkyl.
4. crystal aligning agent according to claim 1, it is characterised in that the pyrrolidones represented by formula 1 is described
Proportion is 0.5 weight %~50 weight % in solvent.
5. a kind of liquid crystal orienting film, it is characterised in that the liquid crystal orienting film is by will be such as any one of claim 1-4 institutes
The crystal aligning agent stated is applied on substrate and is obtained.
6. a kind of liquid crystal display cells, it is characterised in that including liquid crystal orienting film as claimed in claim 5.
7. a kind of manufacture method of liquid crystal display cells, it is characterised in that including：Will be as any one of claim 1-4
Crystal aligning agent be applied to substrate, liquid crystal orienting film then is formed to the substrate heated baking.
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| TW102113071A TWI480264B (en) | 2013-04-12 | 2013-04-12 | Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element and method of manufacturing the same |
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| TWI522421B (en) * | 2014-03-18 | 2016-02-21 | Daxin Materials Corp | Liquid crystal alignment composition |
| KR20160124364A (en) | 2015-04-17 | 2016-10-27 | 삼성디스플레이 주식회사 | Method of manufacturing photo alignment film and liquid crystal display |
| KR102431140B1 (en) | 2015-11-02 | 2022-08-12 | 티씨엘 차이나 스타 옵토일렉트로닉스 테크놀로지 컴퍼니 리미티드 | Liquid crystal photo alinement agent and method of manufacturing liquid crystal display device using the same |
| CN106353925A (en) * | 2016-11-01 | 2017-01-25 | 深圳市瑞福达液晶显示技术股份有限公司 | Method for manufacturing high-duty cycle vertical orientation liquid crystal display device |
| KR102188725B1 (en) * | 2017-09-26 | 2020-12-09 | 주식회사 엘지화학 | Novel compound and modified diene polymer comprising fuctional group derived by the same |
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| TWI499656B (en) * | 2011-07-14 | 2015-09-11 | Nissan Chemical Ind Ltd | Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element |
| JP5866897B2 (en) * | 2011-09-08 | 2016-02-24 | Jsr株式会社 | Liquid crystal aligning agent, liquid crystal alignment film, liquid crystal display element, and method for manufacturing liquid crystal display element |
| JP5990928B2 (en) * | 2012-02-24 | 2016-09-14 | Jsr株式会社 | Liquid crystal alignment agent |
| JP6146077B2 (en) * | 2012-06-29 | 2017-06-14 | Jsr株式会社 | Method for producing liquid crystal alignment film |
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| JP6146135B2 (en) * | 2012-08-30 | 2017-06-14 | Jsr株式会社 | Liquid crystal aligning agent, liquid crystal aligning film, method for producing liquid crystal aligning film, and liquid crystal display element |
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| JP2007011221A (en) * | 2005-07-04 | 2007-01-18 | Hitachi Cable Ltd | Liquid crystal aligning agent |
| JP2009193048A (en) * | 2008-01-17 | 2009-08-27 | Jsr Corp | Liquid crystal aligning agent, method of forming liquid crystal alignment film and liquid crystal display element |
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| KR102237883B1 (en) | 2021-04-08 |
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