WO2004104683A1 - 液晶シール剤およびそれを用いた液晶表示セル - Google Patents
液晶シール剤およびそれを用いた液晶表示セル Download PDFInfo
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- WO2004104683A1 WO2004104683A1 PCT/JP2004/006646 JP2004006646W WO2004104683A1 WO 2004104683 A1 WO2004104683 A1 WO 2004104683A1 JP 2004006646 W JP2004006646 W JP 2004006646W WO 2004104683 A1 WO2004104683 A1 WO 2004104683A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C08L33/062—Copolymers with monomers not covered by C08L33/06
- C08L33/066—Copolymers with monomers not covered by C08L33/06 containing -OH groups
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- 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
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
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- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/061—Polyesters; Polycarbonates
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
- C08L33/16—Homopolymers or copolymers of esters containing halogen atoms
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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
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- 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
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
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- 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
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
- C09K2323/055—Epoxy
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- 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
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
- C09K2323/057—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/287—Adhesive compositions including epoxy group or epoxy polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/2878—Adhesive compositions including addition polymer from unsaturated monomer
- Y10T428/2891—Adhesive compositions including addition polymer from unsaturated monomer including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof
Definitions
- the present invention relates to a liquid crystal sealant and a liquid crystal display cell using the same. More specifically, the liquid crystal is dropped by dropping the liquid crystal inside the liquid crystal sealant of the photo-thermosetting type formed on one substrate, and then bonding the other substrate and curing the liquid crystal sealant to seal the liquid crystal.
- the present invention relates to a liquid crystal sealant that can be used for manufacturing a liquid crystal display cell, and a liquid crystal display cell manufactured using the same.
- the liquid crystal sealant first comes into contact with the liquid crystal in an uncured state. At that time, the components of the liquid crystal sealant dissolve in the liquid crystal and lower the specific resistance of the liquid crystal. However, it is not widely used as a mass production method for liquid crystal display cells.
- thermosetting method there is a problem that the liquid crystal leaks from the liquid crystal sealant during curing, which has been reduced in viscosity due to the expansion of the liquid crystal due to heating, and if the components of the liquid crystal sealant, which has been reduced in viscosity, dissolve in the liquid crystal. These problems are difficult to solve. Therefore, the thermosetting method has not yet been put to practical use.
- the liquid crystal sealant used in the photocuring method there are two types, a thione polymerization type and a radical polymerization type, depending on the type of the photopolymerization initiator.
- a thione polymerization type liquid crystal shearing agents ions are generated during photo-curing. In this case, the ionic component elutes into the liquid crystal in a contact state, and the specific resistance of the liquid crystal is reduced.
- the radical polymerization type liquid crystal sealant has a problem that the adhesive strength is not sufficient because the curing shrinkage at the time of photocuring is large.
- a problem common to both the cationic polymerization type and the radical polymerization type photocuring methods is that light is applied to the liquid crystal sealant by the metal wiring part of the array substrate of the liquid crystal display cell and the black matrix part of the color filter substrate. There is a light-shielding portion that does not hit, so that the light-shielding portion is uncured.
- thermosetting method and the photocuring method have various problems, and the combined photothermosetting method is considered to be the most practical method in practice.
- the photo-thermal curing method is characterized by irradiating a liquid crystal sealant sandwiched between substrates with light for primary curing, and then heating for secondary curing.
- a characteristic required for the liquid crystal sealant used in the combined photo-heat curing method it is important that the liquid crystal sealant does not contaminate the liquid crystal in each step before and after light irradiation and before and after heat curing. It is necessary to take a countermeasure, that is, a countermeasure against liquid crystal elution of a sealing agent component from a portion that has not been photocured during thermosetting.
- Possible solutions include (i) curing at a low temperature and quickly before the sealing agent component elutes, and (ii) composing the sealing agent with a component that is difficult to elute in the liquid crystal composition.
- curing at low temperature and high speed is a serious problem in practical use because it means that the pot life at the time of use deteriorates at the same time. Therefore, in order to realize a liquid crystal sealant having a long pot life and low liquid crystal contamination, it is necessary to use a component which is hardly eluted in the liquid crystal composition.
- epoxy resins such as bisphenol A epoxy resin and bisphenol F epoxy resin, have good compatibility with liquid crystals and are therefore suitable as sealant components from the viewpoint of contamination. To say, difficult, difficult.
- JP-A-2001-133794 a bisphenol A-type epoxy resin in which a partial (meth) atalylate is used as a main component of a resin is used as a liquid crystal sealant for a dropping method.
- Proposals have been made (see JP-A-2001-133794 and JP-A-5-295087).
- the solubility in the liquid crystal is reduced by (meth) atalylate, it is hardly sufficient, and it is difficult to solve the problem of unreacted residual epoxy resin contaminating the liquid crystal. .
- the conventionally proposed photo-thermosetting liquid crystal sealant for the liquid crystal dropping method has all properties such as liquid crystal contamination, adhesive strength, pot life at room temperature, and low-temperature curability. It's not something you can get satisfied with.
- a partially acryl-shaped bisphenol-type epoxy resin is currently mainly used as a sealant for a liquid crystal dropping method.
- the partially acrylated bisphenol-type epoxy resin is easily eluted when it comes into contact with the liquid crystal or when heat is applied to the liquid crystal, causing poor alignment of the liquid crystal and causing display failure.
- the reliability of the panenole was reduced.
- the entire acrylic resin of the bisphenol-type epoxy resin is relatively hard to elute into the liquid crystal, but is not always sufficient.
- the present invention provides a liquid crystal display cell which is obtained by dropping liquid crystal inside a liquid crystal sealant formed on one substrate, bonding the other substrate, irradiating the liquid crystal seal portion with light, and curing by heating.
- This relates to a liquid crystal sealant that can be used in the liquid crystal dropping method for manufacturing liquid crystal, which has extremely low contamination of the liquid crystal throughout the process, and has almost no elution of the sealant component into the liquid crystal even in the light shielding part. It proposes a liquid crystal sealant that is excellent in application workability, bonding property, adhesive strength, and low-temperature curing property.
- the present inventors have made intensive studies to solve the above-mentioned problems, and as a result, completed the present invention.
- the radiation-curable resin of the present invention has extremely low compatibility with the liquid crystal composition, and the liquid crystal sealant using the resin has very low contamination to the liquid crystal.
- the radiation-curable resin used in the present invention has a low viscosity, it is possible to use a resin having a higher viscosity with less restrictions on other components that can be used when forming a liquid crystal sealant composition. It also makes it possible to fill more fillers.
- the present invention provides:
- a liquid crystal sealant comprising an inorganic filler having a diameter of 3 ⁇ m or less as an essential component
- R 1 represents a hydrogen atom or a methyl group.
- R 2 represents a hydrogen atom, a halogen atom, a hydroxyl group, a monovalent linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or a carbon atom having 1 to 10 carbon atoms. Represents an alkoxy group of 10; m represents an integer of 1 to 4; m may be the same or different; R 3 represents a hydrogen atom or a methyl group; The range of positive numbers is.
- the radiation-curable resin is a radiation-curable resin represented by the general formula (2),
- the number p of repeating units is a positive number in the range of 0 to 20.
- liquid crystal sealing agent according to any one of (1) to (6), further comprising (d) an epoxy resin and (e) a thermosetting agent.
- thermosetting agent is a dihydrazide
- thermosetting agent is a polyvalent phenol
- liquid crystal sealant according to any one of (1) to (11), further comprising (f) a silane coupling agent.
- the present invention relates to a method for manufacturing a liquid crystal display cell.
- liquid crystal sealant of the present invention it was possible to obtain a liquid crystal sealant having excellent adhesive strength and low liquid crystal contamination.
- a highly reliable liquid crystal display cell can be manufactured.
- the liquid crystal sealant of the present invention comprises (a) a radiation-curable resin represented by the general formula (1), (b) a photopolymerization initiator, and (c) an inorganic resin having an average particle diameter of 3 ⁇ m or less. Filler must be included as an essential component And features.
- R 1 represents a hydrogen atom or a methyl group, and is preferably a hydrogen atom.
- R 2 represents a hydrogen atom, a halogen atom, a hydroxyl group, a monovalent linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms, and is preferably a hydrogen atom.
- R 3 represents a hydrogen atom or a methyl group, and is preferably a hydrogen atom.
- m represents an integer of 1 to 4, and m may be the same or different.
- the number n of repeating units is in the range of positive numbers from 0 to 20, and preferably in the range of positive numbers from 0 to 1.5.
- a radiation-curable resin represented by the general formula (2) is preferably exemplified, and p is a positive number of 0 to 20. A range, especially a positive number range of 0 to 1.5 is preferable.
- the radiation-curable resin (a) used in the present invention includes resorcinol diglycidyl ether, force techol diglycidyl ether, quinone diglycidyl ether at the mouth, and (meth) acrylic acid in an amount equivalent to the epoxy group.
- resorcinol diglycidyl ether force techol diglycidyl ether
- quinone diglycidyl ether at the mouth and (meth) acrylic acid in an amount equivalent to the epoxy group.
- an equivalent amount of (meth) acrylic acid can be added to a resin such as zonoresin diglycidyl ether, a catalyst (eg, benzinole dimethylamine, triethylamine, benzyltrimethylammonium chloride, triphenylinolephosphine, triphenylstibine, etc.) and a polymerization inhibitor (eg, , Methquinone, hide-mouth quinone, methylhydroquinone, phenothiazine, dibutylhydroxytoluene, etc.) to carry out an esterification reaction at, for example, 80-110 ° C.
- the (meth) atallylated rezonolecin diglycidyl ether thus obtained is a resin having a radically polymerizable (meth) atalyloyl group.
- the radiation-curable resin (a) used in the present invention may be prepared, for example, by adding resorcin, catechol, hydroquinone, or the like to an equivalent amount or an excess of glycidyl (meth) atalylate with respect to the ⁇ H group equivalent. It can also be obtained by reacting. This synthesis reaction can be performed by a generally known method.
- resorcinol may be catalyzed with glycidyl (meth) atalylate in an amount equivalent to its OH group equivalent (eg, benzyldimethylamine, triethynoleamine, benzyltrimethylammonium chloride, triphenylphosphine, triphenylstyrene).
- Bottles and polymerization prevention An esterification reaction is carried out at 80 to 110 ° C by adding together with a terminator (for example, methoquinone, hydroquinone, methylhydroquinone, phenothiazine, dibutylhydroxytoluene, etc.).
- the (meth) acrylated resonoresin diglycidinole ether thus obtained is a resin having a radically polymerizable (meth) atalyloyl group.
- the content of the radiation-curable resin (a) in the liquid crystal sealing agent is usually about 30% by weight to about 80% by weight, preferably 40% to 75% by weight based on the entire liquid crystal sealing agent. It is about.
- the radiation-curable resin (a) preferably has a viscosity of about 30 to 500 Pa's.
- any photopolymerization initiator such as a radical initiator and a cationic initiator may be used. And preferably a radical initiator.
- the radical initiator include benzyldimethylketal, 1-hydroxycyclohexylphenylketone, getylthioxanthone, benzophenone, 2-ethylanthraquinone, 2-hydroxy-1-methylpropiophenone, Methinole_ [4- (methylthio) phenyl] _2-morpholinol 11-propane, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc.
- an initiator which has sensitivity near i-line (365 nm) and low liquid crystal contamination is preferable.
- an initiator which has sensitivity near i-line (365 nm) and low liquid crystal contamination is preferable.
- Specific examples of such an initiator include a strong rubazole initiator such as 3,6_bis (2-methyl-2-morpholinopropionyl) -191-n-octylcarbazole.
- the compounding ratio of component (b) photopolymerization initiator to component (a) is the compounding ratio of component (b) photopolymerization initiator to component (a)
- component (a) 0.01 to 5 parts by weight per 100 parts by weight of component (a) is particularly preferred, and 0.1 to 3 parts by weight is particularly preferred. If the amount of the photopolymerization initiator is less than 0.1 part by weight, the photocuring reaction becomes insufficient, and if the amount is more than 3 parts by weight, the amount of the initiator is too large, causing contamination of the liquid crystal by the initiator and deterioration of the cured resin properties. May be a problem.
- the inorganic filler (c) used in the present invention includes fused silica, crystalline silica, silicon carbide, silicon nitride, boron nitride, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, myriki, talc, Clay, anoremina, magnesium oxide, zirconium oxide, aluminum hydroxide, magnesium hydroxide, calcium silicate, aluminum silicate, Examples include lithium aluminum silicate, zirconium silicate, barium titanate, glass fiber, carbon fiber, molybdenum disulfide, asbestos, and the like, preferably fused silica, crystalline silica, silicon nitride, boron nitride, calcium carbonate, barium sulfate, and calcium sulfate.
- inorganic fillers may be used as a mixture of two or more kinds.
- the average particle size of the inorganic filler used in the present invention is 3 zm or less, and the lower limit is 0.
- the average particle size of the inorganic filler is determined by a laser diffraction / scattering particle size distribution analyzer (dry type) (manufactured by Seishin Enterprise Co., Ltd .; LMS_
- the content of the inorganic filler used in the present invention in the liquid crystal sealant is usually 5 to 40% by weight, preferably 15 to 25% by weight.
- the content of the inorganic filler is less than 5% by weight, the adhesive strength to a glass substrate is reduced, and the reliability of moisture resistance is poor, so that the adhesive strength after absorbing moisture tends to be large.
- the content of the inorganic filler is more than 40% by weight, the content of the filler is too large, so that the filler is hardly crushed and the gap of the liquid crystal cell may not be formed.
- the liquid crystal sealant of the present invention comprises, in addition to the above three essential components (a) to (c), an epoxy resin
- the epoxy resin (d) used in the present invention is not particularly limited. However, from the viewpoint of liquid crystal contamination, the epoxy resin (d) is brought into direct contact with 10 times the amount of liquid crystal of the epoxy resin and left at 120 ° C for 1 hour. It is preferable that the epoxy resin does not elute 0.5% by weight or more with respect to the liquid crystal when placed.
- an epoxy resin for example, bisphenol S-type epoxy resin represented by the formula (3),
- ⁇ represents an integer of 1 to 10.
- the elution amount can be determined by gas chromatography using pentadecane as an internal standard substance.
- the amount of hydrolyzable chlorine in the epoxy resin used in the present invention is preferably 600 ppm or less, more preferably 300 ppm or less. If the amount of hydrolyzable chlorine is more than 600 ppm, the contamination of the liquid crystal sealant with the liquid crystal may become a problem.
- the amount of hydrolyzable chlorine is determined, for example, by dissolving about 0.5 g of epoxy resin in 20 ml of dioxane, refluxing with 5 ml of 1N K ⁇ H / ethanol solution for 30 minutes, and titrating with 0.01N silver nitrate solution. Can measure S
- the content of the epoxy resin (d) in the liquid crystal sealant is generally about 1% to 40% by weight, preferably about 5% to 30% by weight, based on the entire liquid crystal sealant.
- the liquid crystal sealing agent of the present invention preferably contains a thermosetting agent (e).
- the thermosetting agent is not particularly limited as long as it reacts with the epoxy resin (d) to form a cured product. However, when heated, the liquid crystal sealant does not contaminate the liquid crystal uniformly. It is important that the reaction be started promptly and that the viscosity change with time at room temperature be small during use. In the case of the liquid crystal dropping method, in order to minimize the deterioration in the properties of the liquid crystal to be sealed, low-temperature curing ability at about 120 ° C for about 1 hour is generally required. In view of the above, it is particularly preferable to use multifunctional hydrazides and polyvalent phenols as the thermosetting component in the liquid crystal sealant of the present invention.
- the polyfunctional dihydrazides refer to those having two or more hydrazide groups in a molecule, and specific examples thereof include, for example, carbohydrazide, oxalic acid dihydrazide, malonic acid dihydrazide, succinic dihydrazide, Adipic dihydrazide, adipic dihydrazide, pimelic dihydrazide, suberic dihydrazide, azelaic dihydrazide, sebacic dihydrazide, dodecandiodihydrazide, hexadecandiohydrazide, maleic dihydrazide, fumaric dihydrazide, fumaric dihydrazide Dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, 2,6-naphthoic acid dihydrazide, 4,4-bis
- a polyfunctional dihydrazide When a polyfunctional dihydrazide is used as a curing agent, it is preferable to uniformly disperse the particles in a fine particle size in order to use the latent curing agent.
- polyfunctional dihydrazides preferred are dihydrazides, and particularly preferred from the viewpoint of liquid crystal contamination are isophthalic dihydrazide and dihydrazides having a norinhydantoin skeleton.
- polyvalent phenols refer to those having two or more hydroxyl groups in the molecule. Specific examples include bisphenol A, bisphenol F, bisphenol S, bisphenol E, phenol novolak, cresol novolak, trisphenolmethane novolak, biphenyl nopolak, naphthalene novolak and the like. Force These are not limited.
- the average particle diameter of the component (e) is not more than 3 ⁇ m because if it is too large, it may cause a failure such as inability to form a gap at the time of bonding the upper and lower glass substrates during the production of a narrow gap liquid crystal cell. Is more preferably 2 xm or less. Similarly, the maximum particle size is preferably 8 zm or less, more preferably 5 xm or less.
- the particle size of the curing agent was measured by a laser diffraction 'scattering type particle size distribution analyzer (dry type) (manufactured by Seishin Enterprise Co., Ltd .; LMS-30). The average particle size is preferably adjusted so as not to be extremely small (for example, 0.1 lzm or less).
- the compounding ratio of the component (e) is preferably 0.8 to 1.5 equivalents to the equivalent of the epoxy group of the component (d), more preferably 0.9. -1.2 equivalents. If the amount of the component (d) is less than 0.8 equivalent, the thermosetting reaction becomes insufficient, and the adhesive strength and the glass transition point may decrease. On the other hand, if the equivalent is more than 1.5, the curing agent remains and the adhesive strength is reduced, and the pot life may be deteriorated.
- the liquid crystal sealant of the present invention preferably contains a silane coupling agent (f) in order to improve the adhesive strength.
- the silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2_ (3,4-epoxycyclohexyl) ethyltrimethoxysilane, N— Fe-Niu gamma-aminopropyltrimethoxysilane, ⁇ - (2-aminoethyl) 3-aminopropylmethyldimethoxysilane, ⁇ - (2-aminoethyl) 3-aminopropylmethyltrimethoxysilane, 3- Aminopropyltriethoxysilane, 3_mercaptopropyltrimethoxysilane, butyltrimethoxysilane, ⁇ — (2- (Bubenzyl
- the silane coupling agent has an amino group in order to obtain better adhesive strength.
- it is a silane coupling agent.
- the adhesive strength is improved, and a liquid crystal sealant having excellent moisture resistance reliability can be obtained.
- the content of the strong silane coupling agent (f) in the liquid crystal sealant is usually about 0.01% to 5% by weight, preferably 0.02% by weight and 1% by weight based on the whole liquid crystal. Degree.
- the liquid crystal sealant according to the present invention may further contain, if necessary, additives such as an organic solvent, an organic filler, and a pigment, a leveling agent, and an antifoaming agent.
- liquid crystal sealant of the present invention for example, first, component (a), component (b), component (d), and if necessary, component (f) are dissolved and mixed. Next, a predetermined amount of a component (e), a component (c), and, if necessary, an antifoaming agent, a leveling agent, and an organic filler are added to the mixture as a thermosetting agent.
- the liquid crystal sealant of the present invention can be produced by uniformly mixing with a roll, sand mill, ball mill or the like.
- the liquid crystal display cell of the present invention a pair of substrates each having a predetermined electrode formed on the substrate are opposed to each other at a predetermined interval, and the periphery thereof is sealed with the liquid crystal sealant of the present invention. It has been entered.
- the type of liquid crystal to be enclosed is not particularly limited.
- the substrate is composed of a substrate made of a combination of at least one of glass, quartz, plastic, silicon, and the like having optical transparency.
- the liquid crystal sealing agent of the present invention As a manufacturing method, for example, after adding a spacer (gap controlling material) such as glass fiber to the liquid crystal sealing agent of the present invention, applying the liquid crystal sealing agent to one of the pair of substrates with a dispenser or the like, The liquid crystal is dropped inside the liquid crystal sealant, and the other glass substrate is overlapped in a vacuum to make a gap. After the gap is formed, the liquid crystal seal is irradiated with ultraviolet light by an ultraviolet light irradiator to be light-cured.
- the irradiation amount of ultraviolet rays is preferably 500 mjZcm 2 to 6000 mj / cm 2 , more preferably 100 OmjZcm 2 to 4000 mj / cm 2 . Then 90-130.
- the liquid crystal display cell of the present invention can be obtained by curing for 112 hours with C.
- the liquid crystal display cell of the present invention obtained in this manner is excellent in adhesion and humidity resistance without display failure due to liquid crystal contamination.
- Examples of the spacer include glass fiber, silica beads, and polymer beads. Its diameter varies depending on the purpose, usually 2-8 zm, preferably 417 xm.
- the amount used is based on 100 parts by weight of the liquid crystal sealant of the present invention. The amount is usually about 0.1 to 4 parts by weight, preferably about 0.5 to 2 parts by weight, and more preferably about 0.9 to 1.5 parts by weight.
- the resorcin diglycidyl ether resin was dissolved in toluene, to which dibutylhydroxytoluene was added as a polymerization inhibitor, and the temperature was raised to 60 ° C. Thereafter, 100% equivalent of acrylic acid of the epoxy group was further heated to 80 ° C, and trimethylammonium chloride as a reaction catalyst was added thereto, followed by stirring at 98 ° C for about 50 hours. . The obtained reaction solution was washed with water, and toluene was distilled off to obtain a target epoxy acrylate of resorcinol. (Epoxy acrylate)
- Bisphenol F epoxy resin (manufactured by Nippon Daniyaku Co., Ltd., RE-404P, epoxy equivalent: 160 g / eq, hydrolysis amount: 30 ppm) was dissolved in toluene, and dibutylhydroxytoluene as a polymerization inhibitor was added thereto. The temperature was raised to ° C. Thereafter, acrylic acid equivalent to 60% of the epoxy group was added, and the temperature was further raised to 80 ° C. Trimethylammonium chloride as a reaction catalyst was added thereto, followed by stirring at 98 ° C for about 50 hours. The obtained reaction solution was washed with water and toluene was distilled off to obtain the desired partial epoxy acrylate of bisphenol F. (Epoxy acrylate) c.
- Each of the synthesized epoxy acrylates A-C is put into a sample tube at 0-lg, liquid crystal (Merck, MLC-6866-100) is added and brought into direct contact, and placed in a 120 ° C oven for 1 hour, and then 0%. . Left at room temperature for 5 hours. After taking out only the liquid crystal, the components eluted in the liquid crystal were quantified by gas chromatography using pentadecane as an internal standard substance. Table 1 shows the amount of the eluted substance in% by weight based on the liquid crystal.
- Resorcin diglycidyl ether epoxy acrylate (epoxy acrylate) has a low viscosity, but it is about one-third that of bisphenol F epoxy 100% epoxy acrylate (epoxy acrylate). It can only be eluted to the extent.
- Bisphenol F epoxy 60% partial epoxy acrylate (epoxy acrylate) has three types of epoxy groups, one with both ends acrylated, one with only one side acrylated, and a raw material epoxy resin. Elution was confirmed. Thus, it can be seen that the epoxy atalylate of resorcin diglycidyl ether (epoxy sialylate A) has less elution into the liquid crystal than other epoxy acrylates.
- isophthalic acid dihydrazide (trade name: IDH-S; Otsuka Chemical Jet mill pulverized grade manufactured by Co., Ltd. is further finely pulverized with a jet mill, melting point: 224 ° C, active hydrogen equivalent: 48.5 g / eq, average particle size: 1.7 ⁇ , maximum particle size: 7 ⁇ m) 5 parts by weight , Aluminum (CPC Kasei Co., Ltd., SPC-Al, average particle size 1.0 ⁇ ) 30 parts by weight, core rubber fine particles: Paraloid EXL-2655 (Kureha Chemical Industry Co., Ltd., core layer: crosslinked polybutadiene , Shell layer: Alkyl methacrylate-styrene copolymer, 7 parts by weight of an average particle diameter of 200 ⁇ m) was added, and the mixture was kneaded with a three-roll mill to obtain a liquid crystal sealant of the present invention.
- AMICURE-1 VDH (1,3_bis (hydrazinocarbonoethyl) -15-isopropylhydantoin; finely pulverized by AJI-NO-MOTO FINE TECHNO with a jet mill) 6.5 parts by weight, alumina (CII) 30% by weight, core-shell rubber fine particles: Paraloid EXL-2655 (Kureha Chemical Co., Ltd., core layer: cross-linked polybutadiene, shell layer: alkyl methacrylate) manufactured by Kasei Co., Ltd.
- liquid crystal sealing agent of the present invention 7 parts by weight of a monostyrene copolymer (average particle diameter: 200 nm) was added and kneaded with a three-roll mill to obtain a liquid crystal sealing agent of the present invention.
- the viscosity (25 ° C) of the liquid crystal sealant was 350 Pa's (R-type viscometer (Toki Sangyo Co., Ltd.))
- isophthalic acid dihydrazide (trade name: IDH-S; jet mill pulverized grade manufactured by Otsuka Chemical Co., Ltd.) is further finely pulverized with a jet mill, melting point: 224 ° C, active hydrogen equivalent: 48.5 gZeq, average particle size.
- isophthalic acid dihydrazide (trade name: IDH-S; jet mill pulverized grade manufactured by Otsuka Chemical Co., Ltd.) is further pulverized with a jet mill, melting point: 224 ° C, active hydrogen equivalent: 48.5 g / eq, average particle size . diameter 1 7 / m, maximum particle size 7 beta m) 5 parts by weight, alumina (Shiai Kasei, SPC - Al, average particle size 1.
- the specific resistance of the contact liquid crystal was measured as follows.
- a liquid crystal sealant 0.1 lg of a liquid crystal sealant was placed in a sample bottle, and after liquid crystals (Merck, MLC-6866-100) lm 1 were removed, the sample was irradiated with UV light of 2000 mjZcm 2 by a UV irradiator, and then heated at 120 ° C. The oven was charged for 1 hour, and then left at room temperature for 0.5 hour. Only the liquid crystal was taken out of the sample bottle after the treatment, and the amount of the component eluted in the liquid crystal was quantified by gas chromatography using pentadecane as an internal standard substance. Table 2 shows the results.
- liquid crystal sealant To 100 g of the obtained liquid crystal sealant was added 5 ⁇ m glass fiber lg as a spacer, and the mixture was stirred. After the liquid crystal sealing agent is coated cloth 50 mm X 50 mm glass substrate was irradiated with ultraviolet rays of 2000 mJ / cm 2 by UV irradiation device bonded to glass piece 1. 5mm X l. 5mm on the liquid crystal sealing material Then, it was placed in a 120 ° C. oven for 1 hour to cure. The shear bond strength of the glass piece was measured. Table 2 shows the results.
- the obtained liquid crystal sealant is sandwiched between polyethylene terephthalate (PET) films and a thin film of 100 ⁇ m thickness is irradiated with UV light of 2000 mj / cm 2 by a UV irradiator, and then put into a 120 ° C oven for 1 hour After curing, the PET film was peeled off to obtain a sample.
- the glass transition point was measured in a TMA tester (manufactured by Vacuum Riko Co., Ltd.) in a tensile mode. Table 2 shows the results.
- Example 2 Comparative Example 1 Comparative Example 2 Viscosity (P a ⁇ s) 250 350 400 200 Adhesive strength (MP a) 70 75 75 75 Glass transition temperature ("C) 100 100 90 85 Liquid crystal contamination test (120 :> ⁇ 1 h r.)
- Acrylic resin A 00 80
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Sealing Material Composition (AREA)
- Liquid Crystal (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005506333A JP3921493B2 (ja) | 2003-05-21 | 2004-05-18 | 液晶シール剤およびそれを用いた液晶表示セル |
CA002525178A CA2525178A1 (en) | 2003-05-21 | 2004-05-18 | Sealant for liquid crystal and liquid-crystal display cell made with the same |
KR1020057020718A KR101194558B1 (ko) | 2003-05-21 | 2004-05-18 | 액정 실란트 및 그것을 사용하여 제조한 액정표시 셀 |
DE602004021928T DE602004021928D1 (de) | 2003-05-21 | 2004-05-18 | Dichtmittel für flüssigkristall und damit hergestellte flüssigkristallanzeigezelle |
EP04733630A EP1630594B1 (en) | 2003-05-21 | 2004-05-18 | Sealant for liquid crystal and liquid-crystal display cell made with the same |
US10/555,898 US7678433B2 (en) | 2003-05-21 | 2004-05-18 | Sealant for liquid crystal and liquid-crystal display cell made with the same |
Applications Claiming Priority (4)
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JP2003142805 | 2003-05-21 | ||
JP2003-142805 | 2003-05-21 | ||
JP2003160513 | 2003-06-05 | ||
JP2003-160513 | 2003-06-05 |
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WO2004104683A1 true WO2004104683A1 (ja) | 2004-12-02 |
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PCT/JP2004/006646 WO2004104683A1 (ja) | 2003-05-21 | 2004-05-18 | 液晶シール剤およびそれを用いた液晶表示セル |
Country Status (8)
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US (1) | US7678433B2 (ja) |
EP (1) | EP1630594B1 (ja) |
JP (1) | JP3921493B2 (ja) |
KR (2) | KR101194558B1 (ja) |
CA (1) | CA2525178A1 (ja) |
DE (1) | DE602004021928D1 (ja) |
TW (1) | TWI343504B (ja) |
WO (1) | WO2004104683A1 (ja) |
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EP1630594A1 (en) | 2006-03-01 |
DE602004021928D1 (de) | 2009-08-20 |
EP1630594A4 (en) | 2006-06-14 |
TW200527083A (en) | 2005-08-16 |
US20070020405A1 (en) | 2007-01-25 |
KR20060009282A (ko) | 2006-01-31 |
US7678433B2 (en) | 2010-03-16 |
KR20120003502A (ko) | 2012-01-10 |
KR101194558B1 (ko) | 2012-10-25 |
TWI343504B (en) | 2011-06-11 |
EP1630594B1 (en) | 2009-07-08 |
JPWO2004104683A1 (ja) | 2006-07-20 |
JP3921493B2 (ja) | 2007-05-30 |
CA2525178A1 (en) | 2004-12-02 |
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