WO2013008884A1 - 液晶シール剤及びそれを用いた液晶表示セル - Google Patents
液晶シール剤及びそれを用いた液晶表示セル Download PDFInfo
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- WO2013008884A1 WO2013008884A1 PCT/JP2012/067826 JP2012067826W WO2013008884A1 WO 2013008884 A1 WO2013008884 A1 WO 2013008884A1 JP 2012067826 W JP2012067826 W JP 2012067826W WO 2013008884 A1 WO2013008884 A1 WO 2013008884A1
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- Prior art keywords
- liquid crystal
- group
- component
- crystal dropping
- sealant
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- 0 *C(C(c1ccccc11)=O)=CC1=O Chemical compound *C(C(c1ccccc11)=O)=CC1=O 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F299/00—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F299/02—Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers from unsaturated polycondensates
-
- 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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
- C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
- C08G59/1461—Unsaturated monoacids
- C08G59/1466—Acrylic or methacrylic acids
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- 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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
Definitions
- the present invention relates to a liquid crystal sealant for a liquid crystal dropping method that can be cured by heat. More specifically, the present invention relates to a liquid crystal sealant for a liquid crystal dropping method which has a good curability by heat and is excellent in properties of a cured product such as handling property, storage stability and adhesive strength, and a production method thereof and a cured product thereof. .
- Patent Documents 1 and 2 a so-called liquid crystal dropping method with higher mass productivity has been proposed as a liquid crystal display cell manufacturing method. Specifically, it is a method of manufacturing a liquid crystal display cell in which liquid crystal is sealed by dropping a liquid crystal inside a weir of a liquid crystal sealant formed on one substrate and then bonding the other substrate.
- the liquid crystal sealant in an uncured state comes into contact with the liquid crystal. At that time, the components of the liquid crystal sealant are dissolved (eluting) in the liquid crystal to reduce the resistance value of the liquid crystal, There is a problem that display defects occur.
- a photothermal combination type liquid crystal sealant for a liquid crystal dropping method is currently used and put into practical use (Patent Documents 3 and 4).
- the liquid crystal dropping method using the liquid crystal sealant is characterized in that the liquid crystal sealant sandwiched between the substrates is irradiated with light to be primarily cured and then heated to be secondarily cured.
- the uncured liquid crystal sealant can be quickly cured by light, and dissolution (elution) of the liquid crystal sealant component into the liquid crystal can be suppressed.
- the problem of insufficient adhesive strength due to curing shrinkage or the like at the time of photocuring occurs only by photocuring, but the photothermal combination type has an advantage that such problems can be solved by secondary curing by heating.
- the handling property means the ease of use of the liquid crystal sealant.
- the liquid crystal sealant is cured or gelled in a process such as a defoaming process of liquid crystal sealant or a process of mixing a spacer agent, or in a process where heat is applied.
- the ease with which a phenomenon occurs is defined as handling. Accordingly, a liquid crystal sealant having good handling properties is used as a material that hardly causes gelation, and a liquid crystal sealant having poor handling properties is used as a material that easily causes gelation.
- liquid crystal sealant for liquid crystal dropping method has been developed very vigorously, but has excellent thermal reactivity and light-shielding part curability, handling and storage.
- a liquid crystal sealant that has both stability and excellent cured product properties has not yet been realized.
- the present invention provides a liquid crystal by dripping a liquid crystal inside a liquid crystal sealant weir formed on one substrate and then bonding the other substrate and curing the liquid crystal sealant part only by heating or by combined use of light and heat. It relates to the liquid crystal sealant used in the liquid crystal dropping method for manufacturing display cells, and because of the fast reaction by heat, it is extremely low in contamination with liquid crystal throughout the process, and has excellent handling properties such as defoaming, etc.
- the present invention proposes a liquid crystal sealant that can be applied to a liquid crystal panel of any design because it is excellent in coating properties, bonding properties, adhesive strength, and the like.
- the present inventors have found that a liquid crystal sealant that uses a specific thermal radical polymerization initiator and a radical polymerization inhibitor in combination achieves both the above thermal reactivity and handling properties, and as a result, also has liquid crystal contamination.
- the present invention was completed by finding that it can be suppressed and also excellent in cured product properties such as adhesive strength. That is, the present invention relates to the following (1) to (12).
- “(meth) acryl” means one or both of “acryl” and “methacryl”.
- (meth) acryloyl” means one or both of “acryloyl” and “methacryloyl”.
- Y 1 and Y 2 each independently represent a hydrogen atom, a phenyl group, or a silicon atom
- R 1 to R 6 each independently represent a hydrogen atom or a straight chain having 1 to 4 carbon atoms. Alternatively, it represents a branched alkyl group
- X 1 to X 4 each independently represent a hydrogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenoxy group, or a halogen atom.
- R 1 to R 3 or R 4 to R 6 bonded to Y 1 or Y 2 respectively do not exist when Y 1 or Y 2 is a hydrogen atom.
- R 9 to R 12 are each independently A linear or branched alkyl group having 1 to 4 carbon atoms is shown.
- R 13 represents a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms.
- Liquid crystal sealant for liquid crystal dropping method (10) The manufacturing method of the liquid-crystal sealing compound for liquid crystal dropping methods of any one of said (1) thru
- the liquid crystal sealant of the present invention has a high curing rate during heat curing, it can be applied to a liquid crystal dropping method in which the liquid crystal sealant is cured only by heat.
- the photothermal combined liquid crystal dripping method has sufficient curability even under wiring where light is difficult to reach. Therefore, the degree of freedom in designing the wiring of the panel can be secured, and the production of a highly reliable liquid crystal display panel is possible. Can be made easier.
- the thermal radical polymerization initiator (a) having no oxygen-oxygen bond (—O—O—) and nitrogen-nitrogen bond (—N ⁇ N—) in the molecule used in the present invention generates radicals by heating.
- the compound is not particularly limited as long as it is a compound that initiates a chain polymerization reaction, and examples thereof include benzoins, benzoin ethers, acetophenones, and benzopinacols. Among these, from the viewpoint of reactivity and solubility in liquid crystals, the compound represented by the above formula (1) is particularly preferably used.
- Y 1 and Y 2 each independently represent a hydrogen atom, a phenyl group, or a silicon atom, preferably at least one of which is a silicon atom.
- the linear or branched alkyl group having 1 to 4 carbon atoms (hereinafter also simply referred to as C1 to C4 alkyl group) in R 1 to R 6 is, for example, methyl, ethyl, n-propyl, i-propyl , T-butyl and the like.
- the halogen in X 1 to X 4 include a fluorine atom, a chlorine atom, and a bromine atom.
- R 1 R 2 R 3 Y 1 — or R 4 R 5 R 6 Y 2 — represents a phenyl group, 1 to 3 C1-C4 alkyls
- Preferred is a phenyl group substituted with a group, a di-C1-C4 alkylsilyl group, or a tri-C1-C4 alkylsilyl group, more preferably a di-C1-C4 alkylsilyl group or a tri-C1-C4 alkylsilyl group, and even more preferably.
- the groups may be the same or different.
- the silyl group include di-C1 to C4 alkylsilyl groups such as dimethylsilyl, diethylsilyl, and methylethylsilyl; triC1 to C4 alkylsilyl groups such as trimethylsilyl, triethylsilyl, dimethylethylsilyl, and t-butyldimethylsilyl.
- X 1 to X 4 in the formula (1) each independently represent a hydrogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenoxy group, or a halogen atom, and preferably all of X 1 to X 4 are This is the case for hydrogen atoms.
- the compound represented by the formula (1) include benzopinacol, 1,2-dimethoxy-1,1,2,2-tetraphenylethane, 1,2-diethoxy-1,1,2,2 -Tetraphenylethane, 1,2-diphenoxy-1,1,2,2-tetraphenylethane, 1,2-dimethoxy-1,1,2,2-tetra (4-methylphenyl) ethane, 1,2- Diphenoxy-1,1,2,2-tetra (4-methoxyphenyl) ethane, 1,2-bis (trimethylsiloxy) -1,1,2,2-tetraphenylethane, 1,2-bis (triethylsiloxy) -1,1,2,2-tetraphenylethane, 1,2-bis (t-butyldimethylsiloxy) -1,1,2,2-tetraphenylethane, 1-hydroxy-2-trimethylsiloxy-1,1 , , 2-tetraphenylethane, 1-hydroxy-2-triethylsiloxy-1,1,1,2,
- benzopinacol is commercially available from Tokyo Chemical Industry Co., Ltd., Wako Pure Chemical Industries, Ltd. A product obtained by etherifying the hydroxy group of benzopinacol can be easily synthesized by a known method.
- a benzopinacol having a hydroxy group converted to a silyl ether can be obtained by synthesizing the corresponding benzopinacol and various silylating agents by heating in a basic catalyst such as pyridine.
- silylating agent examples include trimethylchlorosilane (TMCS), hexamethyldisilazane (HMDS), N, O-bis (trimethylsilyl) trifluoroacetamide (BSTFA), which are generally known trimethylsilylating agents, and triethylsilylating agents. And triethylchlorosilane (TECS), and t-butylmethylsilane (TBMS), which is a t-butyldimethylsilylating agent. These reagents can be easily obtained from markets such as silicon derivative manufacturers.
- the reaction amount of the silylating agent is preferably 1.0 to 5.0 times mol for 1 mol of the hydroxyl group of the target compound.
- the amount is less than 1.0 times mol, the reaction efficiency is poor and the reaction time is prolonged, so that thermal decomposition is promoted.
- the amount is more than 5.0 times mol, separation may be deteriorated during collection or purification may be difficult.
- Examples of basic catalysts include pyridine and triethylamine.
- the basic catalyst has an effect of trapping hydrogen chloride generated during the reaction to keep the reaction system basic, and an effect of drawing out the hydrogen of the hydroxyl group to further promote the reaction.
- the content may be 0.5 times mol or more with respect to the target hydroxyl group, and may be used as a solvent.
- nonpolar organic solvents such as hexane, ether and toluene are excellent because they do not participate in the reaction.
- polar solvents such as pyridine, dimethylformaldehyde (DMF), dimethyl sulfoxide (DMSO), tetrahydrofuran (THF), and acetonitrile are also preferable.
- the content is preferably such that the mass concentration of the solute is 5 to 40% by mass. More preferably, it is 10 to 30% by mass. If the content of the solvent is too small, the reaction is slow, decomposition by heat is promoted, and the yield decreases. On the other hand, if the amount is too large, the amount of by-products increases and the yield decreases.
- the thermal radical polymerization initiator used in the present invention preferably has a fine particle size and is uniformly dispersed.
- the average particle size is preferably 5 ⁇ m or less, more preferably 3 ⁇ m or less, because if the average particle size is too large, it becomes a cause of defects such as inability to successfully form a gap when the upper and lower glass substrates are bonded together during the production of a narrow gap liquid crystal display cell. .
- a minimum is about 0.1 micrometer.
- the particle size can be measured with a laser diffraction / scattering particle size distribution analyzer (dry type) (manufactured by Seishin Enterprise Co., Ltd .; LMS-30).
- the content of the thermal radical polymerization initiator is preferably 0.0001 to 10 parts by mass, and more preferably 0.0005 when the entire curable resin of the liquid crystal sealant of the present invention is 100 parts by mass. To 5 parts by mass, with 0.001 to 3 parts by mass being particularly preferred.
- curable resin represents the (d) component in the case of containing (c) component and necessity. The same shall apply hereinafter in this application.
- the component (b) radical polymerization inhibitor used in the present invention is particularly limited as long as it is a compound that prevents polymerization by reacting with radicals generated from a radical polymerization initiator or the curable resin monomer. Instead, quinone, piperidine, hindered phenol, nitroso, and the like can be used.
- naphthoquinone 2-hydroxynaphthoquinone, 2-methylnaphthoquinone, 2-methoxynaphthoquinone, 2,2,6,6, -tetramethylpiperidine-1-oxyl, 2,2,6,6, -tetramethyl -4-hydroxypiperidine-1-oxyl, 2,2,6,6, -tetramethyl-4-methoxypiperidine-1-oxyl, 2,2,6,6, -tetramethyl-4-phenoxypiperidine-1- Oxyl, hydroquinone, 2-methylhydroquinone, 2-methoxyhydroquinone, parabenzoquinone, butylated hydroxyanisole, 2,6-di-t-butyl-4-ethylphenol, 2,6-di-t-butylcresol, stearyl ⁇ -(3,5-di-t-butyl-4-hydroxyphenyl) propionate, 2,2'-methyle Bis (4-ethyl-6-tert
- R 8 in the above formula (3) is a hydrogen atom, a hydroxy group, a linear or branched alkoxy group having 1 to 4 carbon atoms, a phenoxy group, an acetamide group (—NHCOCH 3 ), an amino group (—NH 2 ), A carboxy group (—COOH), a cyano group (—CN), a benzoyloxy group (—OCOC 6 H 5 ), an isothiocyanate group (—NCS), or an oxo group ( ⁇ O), preferably a hydrogen atom, a hydroxy group, A straight or branched alkoxy group having 1 to 4 carbon atoms, a phenoxy group, an amino group, and a carboxy group, more preferably a hydrogen atom, a hydroxy group
- Component (b) radical polymerization inhibitor is a method added when synthesizing component (c) curable resin having (meth) acryloyl group, component (c) curable resin and component having (meth) acryloyl group (D) Although there is a method of adding to and dissolving one or both of the curable resins having an epoxy group, in order to obtain a more effective effect, the curable property having a component (c) (meth) acryloyl group It is preferable to add to and dissolve one or both of the resin and the component (d) curable resin having an epoxy group.
- the content of the radical polymerization inhibitor is preferably 0.0001 to 1 part by mass, and preferably 0.001 to 0. 0 parts by mass when the total amount of the curable resin in the liquid crystal sealant of the present invention is 100 parts by mass. 5 parts by mass is more preferable, and 0.01 to 0.2 part by mass is particularly preferable. If the amount of the radical polymerization inhibitor is too small, sufficient handling properties cannot be obtained, and if it is too large, liquid crystal contamination due to delayed thermal reaction may be a problem.
- the liquid crystal sealing agent of the present invention contains a curable resin having a component (c) (meth) acryloyl group.
- curable resins include (meth) acrylic esters and epoxy (meth) acrylates.
- (Meth) acrylic esters include benzyl methacrylate, cyclohexyl methacrylate, glycerol dimethacrylate, glycerol triacrylate, EO-modified glycerol triacrylate, pentaerythritol acrylate, trimethylolpropane triacrylate, tris (acryloxyethyl) isocyanurate, dipentaerythritol.
- examples include hexaacrylate and phloroglucinol triacrylate.
- Epoxy (meth) acrylate is obtained by a known method by a reaction between an epoxy resin and (meth) acrylic acid.
- An epoxy resin more than bifunctional is preferable, for example, a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a bisphenol S type epoxy resin, a phenol novolac type epoxy resin , Cresol novolac type epoxy resin, bisphenol A novolac type epoxy resin, bisphenol F novolac type epoxy resin, alicyclic epoxy resin, aliphatic chain epoxy resin, glycidyl ester type epoxy resin, glycidylamine type epoxy resin, hydantoin type epoxy resin , Isocyanurate type epoxy resins, phenol novolac type epoxy resins having a triphenolmethane skeleton, and other difunctional phenolic diglycidyl esters such as catechol and resorcinol Ether compound, bi-functional alcohol diglycidyl ethers of,
- the content of the curable resin having a (meth) acryloyl group in the liquid crystal sealing agent for the liquid crystal dropping method is 30 to 90 parts by mass when the total amount of the liquid crystal sealing agent is 100 parts by mass. It is preferably within the range of about 50 to 90 parts by mass.
- the adhesive strength can be improved by further using a curable resin having a component (d) epoxy group.
- the curable resin having an epoxy group to be used is not particularly limited, but a bifunctional or higher functional epoxy resin is preferable.
- bisphenol A type epoxy resin bisphenol F type epoxy resin, bisphenol S type epoxy resin, phenol Novolac epoxy resin, cresol novolac epoxy resin, bisphenol A novolac epoxy resin, bisphenol F novolac epoxy resin, alicyclic epoxy resin, aliphatic chain epoxy resin, glycidyl ester epoxy resin, glycidylamine epoxy resin, Hydantoin type epoxy resins, isocyanurate type epoxy resins, phenol novolac type epoxy resins having a triphenolmethane skeleton, and other diglycidyl ethers of bifunctional phenols, Diglycidyl ethers of ability alcohols, and their halides, hydrogenated product and the like.
- the content of the curable resin having an epoxy group in component (d) in the liquid crystal sealant is about 1 to 30 parts by mass when the total amount of the liquid crystal sealant is 100 parts by mass.
- thermosetting agent which is the component (e) used together with the component (d) is not particularly limited, and polyvalent amines, polyhydric phenols, hydrazide compounds, etc.
- the solid organic acid hydrazide is particularly preferably used.
- aromatic hydrazide salicylic acid hydrazide benzoic acid hydrazide, 1-naphthoic acid hydrazide, terephthalic acid dihydrazide, isophthalic acid dihydrazide, 2,6-naphthoic acid dihydrazide, 2,6-pyridinedihydrazide, 1,2,4-benzene
- examples include trihydrazide, 1,4,5,8-naphthoic acid tetrahydrazide, pyromellitic acid tetrahydrazide, and the like.
- aliphatic hydrazide compounds include form hydrazide, acetohydrazide, propionic acid hydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, pimelic acid dihydrazide, sebacic acid dihydrazide.
- 1,4-cyclohexanedihydrazide tartaric acid dihydrazide, malic acid dihydrazide, iminodiacetic acid dihydrazide, N, N'-hexamethylenebissemicarbazide, citric acid trihydrazide, nitriloacetic acid trihydrazide, cyclohexanetricarboxylic acid trihydrazide, 1,3-bis ( Hydantoin skeleton such as hydrazinocarbonoethyl) -5-isopropylhydantoin, preferably valine hydantoin skeleton (where the carbon atom of the hydantoin ring is Dihydrazide compounds having a skeleton substituted with a propyl group), tris (1-hydrazinocarbonylmethyl) isocyanurate, tris (2-hydrazinocarbonylethyl) isocyanurate, tris (2-hydrazinocarbonylethyl) iso
- thermosetting agents may be used alone or in combination of two or more.
- isophthalic acid dihydrazide, malonic acid dihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide tris (1-hydrazinocarbonylmethyl) isocyanurate, tris (2-hydrazinocarbonylethyl) Isocyanurate, tris (2-hydrazinocarbonylethyl) isocyanurate, and tris (3-hydrazinocarbonylpropyl) isocyanurate, particularly preferably malonic acid dihydrazide and sebacic acid dihydrazide.
- the amount used when the thermosetting agent (e) is used is 0.5 to 2.0 equivalents when the epoxy equivalent of the epoxy group of the curable resin having an epoxy group of the component (d) is 1. Yes, preferably 0.8 to 1.2 equivalents.
- silane coupling agents include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxy Silane, N-phenyl- ⁇ -aminopropyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyltrimethoxysilane, 3-amino Propyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, vinyltrimethoxysilane, N- (2- (vinylbenzy
- the component (g) inorganic filler fused silica, crystalline silica, silicon carbide, silicon nitride, boron nitride, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, mica, talc, clay, alumina, magnesium oxide, zirconium oxide , Aluminum hydroxide, magnesium hydroxide, calcium silicate, aluminum silicate, lithium aluminum silicate, zirconium silicate, barium titanate, glass fiber, carbon fiber, molybdenum disulfide, asbestos, etc., preferably fused silica, crystalline silica, Silicon nitride, boron nitride, calcium carbonate, barium sulfate, calcium sulfate, mica, talc, clay, alumina, aluminum hydroxide,
- the particle size can be measured with a laser diffraction / scattering particle size distribution analyzer (dry type) (manufactured by Seishin Enterprise Co., Ltd .; LMS-30).
- the content of the inorganic filler (g) that can be used in the liquid crystal sealant of the present invention in the liquid crystal sealant is usually 1 to 60 parts by mass when the total amount of the liquid crystal sealant of the present invention is 100 parts by mass, The amount is preferably 1 to 40 parts by mass.
- the amount is preferably 1 to 40 parts by mass.
- the liquid crystal sealant for the liquid crystal dropping method of the present invention may contain a component (h) photopolymerization initiator in order to obtain a photothermal combined curing liquid crystal sealant.
- the photopolymerization initiator is not particularly limited as long as it is a compound that generates radicals by UV or visible light irradiation and initiates a chain polymerization reaction.
- benzyldimethyl ketal 1-hydroxycyclohexyl phenyl ketone, diethylthioxanthone, benzophenone 2-ethylanthraquinone, 2-hydroxy-2-methylpropiophenone, 2-methyl- [4- (methylthio) phenyl] -2-morpholino-1-propane, 2,4,6-trimethylbenzoyldiphenylphosphine oxide Etc.
- 2-methacryloyloxyethyl isocyanate and 1- [4- (2-hydroxyethoxy) -phenyl]- The reaction product with 2-hydroxy-2methyl-1-propan-1-one is preferably used.
- This compound can be obtained by the method described in International Publication No. 2006/027982.
- the content of the photopolymerization initiator in the liquid crystal sealant is preferably about 1 to 10 parts by mass when the total amount of the liquid crystal sealant is 100 parts by mass.
- liquid crystal sealing agent of the present invention if necessary, additives such as curing accelerators such as organic acids and imidazoles, organic fillers, pigments, leveling agents, antifoaming agents, and solvents can be blended.
- curing accelerators such as organic acids and imidazoles
- organic fillers such as organic acids and imidazoles
- pigments such as pigments, leveling agents, antifoaming agents, and solvents
- An example of a method for obtaining the liquid crystal sealant of the present invention is the following method. First, component (d) is dissolved and mixed with component (c) as necessary. Next, the component (b) is dissolved in this mixture, and the component (h) is further dissolved as necessary. Subsequently, (a) component, (f) component, (e) component, (g) component, and an organic filler, an antifoamer, a leveling agent, a solvent, etc. are added as needed, and a well-known mixing apparatus, for example, 3 rolls
- the liquid crystal sealant of the present invention can be produced by uniformly mixing with a sand mill, a ball mill or the like and filtering with a metal mesh.
- the liquid crystal display cell of the present invention is a cell in which a pair of substrates having predetermined electrodes formed on a substrate are arranged opposite to each other at a predetermined interval, the periphery is sealed with the liquid crystal sealant of the present invention, and the liquid crystal is sealed in the gap. is there.
- the kind of liquid crystal to be sealed is not particularly limited.
- the substrate is composed of a combination of substrates made of at least one of glass, quartz, plastic, silicon, etc. and having light transmission properties.
- a spacer spacer (gap control material) such as glass fiber
- the liquid crystal sealant is applied to one of the pair of substrates using a dispenser or a screen printing device.
- the liquid crystal display cell of the present invention can be obtained by curing at 90 to 130 ° C. for 1 to 2 hours.
- the liquid crystal sealant part is irradiated with ultraviolet rays by an ultraviolet irradiator and photocured.
- UV irradiation dose is preferably 500 ⁇ 6000mJ / cm 2, more preferably 1000 ⁇ 4000mJ / cm 2.
- the liquid crystal display cell of the present invention can be obtained by curing at 90 to 130 ° C. for 1 to 2 hours.
- the liquid crystal display cell of the present invention thus obtained is free from display defects due to liquid crystal contamination and has excellent adhesion and moisture resistance reliability.
- the spacer include glass fiber, silica beads, and polymer beads.
- the diameter varies depending on the purpose, but is usually 2 to 8 ⁇ m, preferably 4 to 7 ⁇ m.
- the amount used is usually about 0.1 to 4 parts by weight, preferably 0.5 to 2 parts by weight, more preferably about 0.9 to 1.5 parts by weight with respect to 100 parts by weight of the liquid crystal sealant of the present invention. It is.
- the liquid crystal sealant for the liquid crystal dropping method of the present invention has a very good thermosetting property, and quickly cures in the heating step in the liquid crystal dropping method. Accordingly, the elution of the constituent components into the liquid crystal is extremely small, and display defects of the liquid crystal display cell can be reduced. Moreover, since it is excellent in handling property and storage stability, it is suitable for manufacturing a liquid crystal display cell. Furthermore, since the cured product is excellent in various cured product characteristics such as adhesive strength, heat resistance, and moisture resistance, it is possible to produce a liquid crystal display cell with excellent reliability by using the liquid crystal sealant of the present invention. is there. In addition, the liquid crystal display cell prepared using the liquid crystal sealant of the present invention satisfies the characteristics required for a liquid crystal display cell having a high voltage holding ratio and a low ion density.
- liquid crystal sealing agents for liquid crystal dropping methods of Examples 1 to 5.
- liquid crystal sealants for liquid crystal dropping methods of Comparative Examples 1 to 3 were prepared using the components shown in Table 1.
- the prepared liquid crystal sealant for liquid crystal dropping method was molded into 3 cm ⁇ 3 cm ⁇ 1 mm and cured at 120 ° C. ⁇ 1 hr.
- the curability was evaluated by measuring the Shore A hardness of the cured product. The results are shown in Table 1.
- liquid crystal (MLC-6866-100: manufactured by Merck & Co., Inc.) is 10 times its amount. added. After heating at 120 ° C. for 1 hour, it was cooled for 30 minutes. Each supernatant was separated by decantation, and the specific resistance value was measured with a digital ultrahigh resistance meter (R8340: manufactured by Advantest Co., Ltd.), and compared with the specific resistance value without the sealant. The determination was made according to the following criteria.
- the liquid crystal sealant for the liquid crystal dropping method of the present invention has good curability by heat, and is excellent in cured product properties such as handling property, storage stability and adhesive strength. Therefore, the design freedom of the liquid crystal display cell is ensured, and the productivity and the long-term reliability are contributed.
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Abstract
Description
すなわち本発明は、次の(1)~(12)に関するものである。なお、本明細書中、「(メタ)アクリル」とは、「アクリル」及び「メタクリル」の一方又は両方を意味する。同様に、本明細書中、「(メタ)アクリロイル」とは、「アクリロイル」及び「メタクリロイル」の一方又は両方を意味する。
(a)分子内に酸素-酸素結合(-O-O-)及び窒素-窒素結合(-N=N-)を有さない熱ラジカル重合開始剤、(b)ラジカル重合防止剤、及び(c)(メタ)アクリロイル基を有する硬化性樹脂を含有することを特徴とする液晶滴下工法用液晶シール剤。
(2)
上記成分(a)が下記式(1)で表される化合物である上記(1)に記載の液晶滴下工法用液晶シール剤。
(3)
上記成分(b)が下記式(2)乃至(4)から選択される1又は2以上のラジカル重合防止剤である上記(1)又は(2)に記載の滴下工法用液晶シール剤。
(4)
更に、(d)エポキシ基を有する硬化性樹脂及び(e)熱硬化剤を含有する上記(1)乃至(3)のいずれか1項に記載の液晶滴下工法用液晶シール剤。
(5)
上記成分(e)が有機酸ヒドラジドである上記(4)に記載の液晶滴下工法用液晶シール剤。
(6)
更に、(f)シランカップリング剤を含有する上記(1)乃至(5)のいずれか1項に記載の液晶滴下工法用液晶シール剤。
(7)
更に、(g)無機フィラーを含有する上記(1)乃至(6)のいずれか1項に記載の液晶滴下工法用液晶シール剤。
(8)
更に、(h)光重合開始剤を含有する上記(1)乃至(7)のいずれか1項に記載の液晶滴下工法用液晶シール剤。
(9)
上記成分(c)及び上記成分(d)の総量を100質量部とした場合に、上記成分(b)の含有量が0.0001~1質量部である上記(4)又は(5)に記載の液晶滴下工法用液晶シール剤。
(10)
上記成分(c)に対して上記成分(b)を溶解する工程を含む上記(1)乃至(9)のいずれか1項に記載の液晶滴下工法用液晶シール剤の製造方法。
(11)
上記成分(d)に対して上記成分(b)を溶解する工程を含む上記(4)又は(5)に記載の液晶滴下工法用液晶シール剤の製造方法。
(12)
上記(1)乃至(9)のいずれか1項に記載の液晶滴下工法用液晶シール剤、又は上記(10)若しくは(11)に記載の製造方法によって得られる液晶滴下工法用液晶シール剤を硬化して得られる硬化物でシールされた液晶表示セル。
式(1)のY1又はY2が水素原子以外の場合、R1R2R3Y1-又はR4R5R6Y2-は、フェニル基、1~3個のC1~C4アルキル基で置換されたフェニル基、ジC1~C4アルキルシリル基、又はトリC1~C4アルキルシリル基が好ましく、より好ましくはジC1~C4アルキルシリル基又はトリC1~C4アルキルシリル基であり、更に好ましくはトリC1~C4アルキルシリル基である。
式(1)のR1R2R3Y1-、R4R5R6Y2-におけるジ又はトリC1~C4直鎖又は分岐アルキルシリル基において、2個又は3個のC1~C4アルキル基は同一でも異なってもよい。該シリル基としては、例えば、ジメチルシリル、ジエチルシリル、メチルエチルシリル等のジC1~C4アルキルシリル基;トリメチルシリル、トリエチルシリル、ジメチルエチルシリル、t-ブチルジメチルシリル等のトリC1~C4アルキルシリル基;が挙げられる。これらの中で、トリC1~C4アルキルシリル基が最も好ましく、より好ましくはトリメチルシリル基である。
式(1)のX1~X4は各々独立して、水素原子、メチル基、エチル基、メトキシ基、エトキシ基、フェノキシ基、又はハロゲン原子を示し、好ましいのはX1~X4が全て水素原子の場合である。
なお、上記式(3)におけるR8は、水素原子、ヒドロキシ基、炭素数1~4の直鎖若しくは分岐アルコキシ基、フェノキシ基、アセトアミド基(-NHCOCH3)、アミノ基(-NH2)、カルボキシ基(-COOH)、シアノ基(-CN)、ベンゾイロキシ基(-OCOC6H5)、イソチオシアネート基(-NCS)、又はオキソ基(=O)を示し、好ましくは水素原子、ヒドロキシ基、炭素数1~4の直鎖又は分岐アルコキシ基、フェノキシ基、アミノ基、カルボキシ基であり、更に好ましくは水素原子、ヒドロキシ基、アミノ基、カルボキシ基であり、特に好ましくは水素原子、ヒドロキシ基である。
また、(c)(メタ)アクリロイル基を有する硬化性樹脂の液晶滴下工法用液晶シール剤中に占める含有率としては、液晶シール剤の総量を100質量部とした場合に、30~90質量部の範囲内であることが好ましく、更に好ましくは50~90質量部程度である。
(1-ヒドロキシ-2-トリメチルシロキシ-1,1,2,2-テトラフェニルエタンの合成)
市販ベンゾピナコール(東京化成製)100部(0.28モル)をジメチルホルムアルデヒド350部に溶解させ、これに塩基触媒としてピリジン32部(0.4モル)、シリル化剤としてBSTFA(信越化学工業製)150部(0.58モル)を加え70℃まで昇温し、2時間撹拌した。得られた反応液を冷却し、水200部を撹拌しながら入れ、生成物を沈殿させ、未反応シリル化剤を失活分離した。濾別した後十分に水洗し、アセトンで再結晶させ精製することにより、1-ヒドロキシ-2-トリメチルシロキシ-1,1,2,2-テトラフェニルエタン105.6部(収率88.3%)を得た。HPLCで分析した結果、99.0%(面積百分率)であった。また、HPLC-MASSにて438の分子イオンピークを得た。さらにDMSO-d6に溶解してのNMR(プロトン)スペクトルから目的物と同定した。NMRスペクトルの化学シフト値として、水酸基プロトン5.8ppm(1H)、シロキシメチルプロトン0.0ppm(9H)、フェニルプロトン7.1ppm(16H)、7.4ppm(4H)が得られた。
(ビスフェノールA型エポキシ樹脂のエポキシアクリレートの合成)
ビスフェノールA型エポキシ樹脂282.5g(製品名:YD-8125、新日鉄化学株式会社製)をトルエン266.8gに溶解し、これに重合禁止剤としてジブチルヒドロキシトルエン0.8gを加え、60℃まで昇温した。その後、エポキシ基の100%当量のアクリル酸117.5gを加え、更に80℃まで昇温し、これに反応触媒であるトリメチルアンモニウムクロライド0.6gを添加して、98℃で約30時間撹拌し、反応液を得た。この反応液を水洗し、トルエンを留去することにより、目的とするビスフェノールA型のエポキシアクリレート395gを得た(KAYARADRTMR-93100)。
(液晶滴下工法用液晶シール剤の調製)
下記表1に示す割合で各樹脂成分(成分(c)、成分(d))を混合撹拌した後、ラジカル重合防止剤(成分(b))、光重合開始剤(成分(h))を加熱溶解させた。室温まで冷却後、シランカップリング剤(成分(f))、無機フィラー(成分(g))、熱ラジカル開始剤(成分(a))、熱硬化剤(成分(e))等を適宜添加し、撹拌した後、3本ロールミルにて分散させた後、金属メッシュ(635メッシュ)で濾過し、実施例1~5の液晶滴下工法用液晶シール剤を調製した。また同様にして、表1に示す各成分を用いて、比較例1~3の液晶滴下工法用液晶シール剤を調製した。
調製した各液晶滴下工法用液晶シール剤を3cm×3cm×1mmに成型し、120℃×1hrで硬化させた。硬化物のショアA硬度を測定することにより、硬化性を評価した。結果を表1に示す。
調製した各液晶滴下工法用液晶シール剤15gに5μmのスペーサー(PF-50S:日本電気硝子株式会社製)0.15gを混ぜた後、自転500rpm、公転1500rpmで5分間真空撹拌脱泡した。真空撹拌脱泡装置としては、真空撹拌脱泡ミキサーVMXC-360K:株式会社EME製を用いた。それを23℃雰囲気下に置き、ゲル化する時間を測定し、以下基準によって評価した。結果を表1に示す。
○:168時間以上ゲル化しない
△:96時間以上168時間未満でゲル化した
×:脱泡後すぐから96時間未満でゲル化した
3000mJ/cm2の紫外線を照射した後の各液晶滴下工法用液晶シール剤を10mlバイアル瓶の底に100mg程度塗布した後、液晶(MLC-6866-100:メルク株式会社製)をその10倍量加えた。1時間120℃で加熱した後、30分間冷却した。それぞれの上澄みをデカンテーションにて分け取り、デジタル超高抵抗計(R8340:株式会社アドバンテスト製)にて比抵抗値を測定し、シール剤なしのものの比抵抗値と比較した。以下基準により判定を行った。
○:比抵抗値1.0E+11以上
△:比抵抗値1.0E+11以上1.0E+11未満
×:比抵抗値1.0E+10未満
なお、比抵抗値の「1.0E+11」は「1.0×1011」を表し、他の記載も同様である。
Claims (12)
- (a)分子内に酸素-酸素結合(-O-O-)及び窒素-窒素結合(-N=N-)を有さない熱ラジカル重合開始剤、(b)ラジカル重合防止剤、及び(c)(メタ)アクリロイル基を有する硬化性樹脂を含有することを特徴とする液晶滴下工法用液晶シール剤。
- 前記成分(b)が下記式(2)乃至(4)から選択される1又は2以上のラジカル重合防止剤である請求項1又は2に記載の滴下工法用液晶シール剤。
- 更に、(d)エポキシ基を有する硬化性樹脂及び(e)熱硬化剤を含有する請求項1乃至3のいずれか1項に記載の液晶滴下工法用液晶シール剤。
- 前記成分(e)が有機酸ヒドラジドである請求項4に記載の液晶滴下工法用液晶シール剤。
- 更に、(f)シランカップリング剤を含有する請求項1乃至5のいずれか1項に記載の液晶滴下工法用液晶シール剤。
- 更に、(g)無機フィラーを含有する請求項1乃至6のいずれか1項に記載の液晶滴下工法用液晶シール剤。
- 更に、(h)光重合開始剤を含有する請求項1乃至7のいずれか1項に記載の液晶滴下工法用液晶シール剤。
- 前記成分(c)及び前記成分(d)の総量を100質量部とした場合に、前記成分(b)の含有量が0.0001~1質量部である請求項4又は5に記載の液晶滴下工法用液晶シール剤。
- 前記成分(c)に対して前記成分(b)を溶解する工程を含む請求項1乃至9のいずれか1項に記載の液晶滴下工法用液晶シール剤の製造方法。
- 前記成分(d)に対して前記成分(b)を溶解する工程を含む請求項4又は5に記載の液晶滴下工法用液晶シール剤の製造方法。
- 請求項1乃至9のいずれか1項に記載の液晶滴下工法用液晶シール剤、又は請求項10又は11に記載の製造方法によって得られる液晶滴下工法用液晶シール剤を硬化して得られる硬化物でシールされた液晶表示セル。
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WO2014109266A1 (ja) * | 2013-01-11 | 2014-07-17 | 日本化薬株式会社 | 液晶シール剤及びそれを用いた液晶表示セル |
JP2014238575A (ja) * | 2013-05-09 | 2014-12-18 | 積水化学工業株式会社 | 液晶滴下工法用シール剤、上下導通材料、及び、液晶表示素子 |
JP2016206474A (ja) * | 2015-04-24 | 2016-12-08 | 日本化薬株式会社 | 液晶シール剤及びそれを用いた液晶表示セル |
JPWO2016056560A1 (ja) * | 2014-10-08 | 2017-07-27 | 積水化学工業株式会社 | 液晶滴下工法用シール剤、上下導通材料、及び、液晶表示素子 |
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