WO2016136715A1 - 有機エレクトロルミネッセンス表示素子用封止剤 - Google Patents
有機エレクトロルミネッセンス表示素子用封止剤 Download PDFInfo
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- WO2016136715A1 WO2016136715A1 PCT/JP2016/055191 JP2016055191W WO2016136715A1 WO 2016136715 A1 WO2016136715 A1 WO 2016136715A1 JP 2016055191 W JP2016055191 W JP 2016055191W WO 2016136715 A1 WO2016136715 A1 WO 2016136715A1
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- 0 **N(C(N(**)C(N1**)=O)=O)C1=O Chemical compound **N(C(N(**)C(N1**)=O)=O)C1=O 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
- H05B33/04—Sealing arrangements, e.g. against humidity
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/53—Core-shell polymer
-
- 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
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0239—Oxides, hydroxides, carbonates
-
- 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
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0607—Rubber or rubber derivatives
Definitions
- the present invention relates to a sealing agent for organic electroluminescence display elements that is excellent in barrier properties and toughness of a cured product.
- organic electroluminescence (hereinafter, also referred to as “organic EL”) display element has a laminated structure in which an organic light emitting material layer is sandwiched between a pair of electrodes facing each other, and the organic light emitting material layer is formed from one electrode on the organic light emitting material layer.
- organic EL organic electroluminescence
- the organic EL display element performs self-emission, it has better visibility than a liquid crystal display element that requires a backlight, can be reduced in thickness, and can be driven by a DC low voltage. Has the advantage.
- the organic light-emitting material layer and electrodes constituting the organic EL display element have a problem that the characteristics are easily deteriorated by moisture, oxygen, and the like. Therefore, in order to obtain a practical organic EL display element, it is necessary to extend the life by blocking the organic light emitting material layer and the electrode from the atmosphere.
- a sealant for example, Patent Document 1.
- an inorganic film called a passivation film is usually provided on a laminate having an organic light emitting material layer in order to sufficiently suppress the transmission of moisture, oxygen, and the like. A method of sealing the top with a sealant is used.
- a top emission type organic element that extracts light from the upper surface side of the organic light emitting layer is used.
- EL display elements have attracted attention. This method has an advantage that it has a high aperture ratio and is driven at a low voltage, which is advantageous for extending the life.
- a transparent moisture-proof substrate such as glass is interposed on the upper surface side of the light emitting element via a transparent sealing resin.
- An object of this invention is to provide the sealing agent for organic electroluminescent display elements which is excellent in the barrier property and toughness of hardened
- the present invention comprises a cationically polymerizable compound, olefinic rubber particles, a photocationic polymerization initiator, an alkaline earth metal-based and / or magnesium-based water-absorbing filler, and the olefinic rubber particles are core-shell It is the sealing agent for organic electroluminescent display elements which has a structure.
- the present invention is described in detail below.
- the present inventor has found that alkaline earth metal type such as calcium oxide and / or magnesium type It has been found that particularly excellent barrier properties are exhibited when a water-absorbing filler is used. However, when such a water-absorbing filler is used, a cured product of the obtained sealing agent for organic EL display elements expands in a reliability test under a high-temperature and high-humidity condition, etc. When a substrate is used, there is a problem that cracks occur due to bending.
- the present inventor used a combination of a cationic polymerizable compound and an olefin rubber particle having a core-shell structure as a resin component, and dispersed the alkaline earth metal-based and / or magnesium-based water-absorbing filler. As a result, it was found that an encapsulant for organic EL display elements excellent in both barrier properties and toughness of the cured product can be obtained, and the present invention has been completed.
- the sealing agent for organic EL display elements of this invention contains a cationically polymerizable compound.
- the cationic polymerizable compound include compounds having an epoxy group, an oxetanyl group, a vinyl ether group, and the like as the cationic polymerizable group.
- a compound having an epoxy group is preferable.
- an epoxy resin having a bisphenol skeleton, an epoxy resin having a novolak skeleton, an epoxy resin having a naphthalene skeleton, and at least one epoxy resin selected from the group consisting of epoxy resins having a dicyclopentadiene skeleton are preferable,
- An epoxy resin having a bisphenol skeleton is more preferable, and a bisphenol A type epoxy resin and a bisphenol F type epoxy resin are still more preferable.
- R 1 to R 18 are a hydrogen atom, a halogen atom, or a hydrocarbon group that may contain an oxygen atom or a halogen atom, and may be the same or different. Also good.
- X is a bond, an oxygen atom, an alkylene group having 1 to 5 carbon atoms, an oxycarbonyl group, an alkyleneoxycarbonyl group having 2 to 5 carbon atoms, or a secondary amino group.
- R 19 to R 21 are linear or branched alkylene groups having 2 to 10 carbon atoms, which may be the same or different.
- E 1 to E 3 each independently represents an organic group represented by the following formula (3-1) or the following formula (3-2).
- R 22 represents a hydrogen atom or a methyl group.
- Examples of commercially available cationic polymerizable compounds include EPICLON EXA-830LVP (manufactured by DIC), jER 4005P (manufactured by Mitsubishi Chemical), Celoxide 8000, Celoxide 2021P (all manufactured by Daicel), and TEPIC. -VL (manufactured by Nissan Chemical Co., Ltd.)
- the sealing agent for organic EL display elements of the present invention contains olefin rubber particles.
- the olefin rubber particles have a core-shell structure.
- the obtained cured product of the sealing agent for organic EL display elements is excellent in toughness.
- the olefin rubber particles have a lower decomposability than other rubber particles, they also have an effect of suppressing the generation of outgas.
- the olefin-based rubber particle includes a core layer made of a conjugated diene rubber and a resin having a segment derived from a compound having a polymerizable unsaturated double bond. It is preferable to have a shell layer.
- conjugated diene rubber examples include butadiene rubber, styrene / butadiene rubber, isoprene rubber, chloroprene rubber, and the like. Of these, butadiene rubber is preferable.
- the conjugated diene rubber preferably has a glass transition temperature (Tg) of 0 ° C. or lower.
- Examples of the compound having a polymerizable unsaturated double bond include (meth) acrylic compounds, styrene compounds, acrylonitrile compounds, and the like. Of these, (meth) acrylic compounds are preferred. In the present specification, the “(meth) acryl” means acryl or methacryl.
- Examples of the monofunctional compounds among the (meth) acrylic compounds include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t -Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, isononyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, isomyristyl ( (Meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, bicyclopentenyl (meth) acrylate, benzy
- Examples of the bifunctional compounds among the (meth) acrylic compounds include 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexanediol di (meth) acrylate.
- those having three or more functions include, for example, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, propylene oxide-added trimethylolpropane tri (meth) acrylate, ethylene oxide-added tri Methylolpropane tri (meth) acrylate, caprolactone-modified trimethylolpropane tri (meth) acrylate, ethylene oxide-added isocyanuric acid tri (meth) acrylate, glycerin tri (meth) acrylate, propylene oxide-added glycerin tri (meth) acrylate, tris (meth) Acryloyloxyethyl phosphate, pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate , Dipentaerythritol pen
- styrene compound examples include styrene, ⁇ -methylstyrene, divinylbenzene, and the like.
- acrylonitrile-based compound examples include acrylonitrile and methacrylonitrile.
- the olefin-based rubber particle may be a two-layer structure including the core layer and the shell layer as long as it has the core-shell structure, and further intermediate between the core layer and the shell layer. It may be a multilayer structure having three or more layers.
- the olefin rubber particles have a preferable lower limit of the average particle diameter of 10 nm and a preferable upper limit of 2000 nm.
- the average particle diameter of the olefin rubber particles is 10 nm or more, the obtained cured product of the sealing agent for organic EL display elements is excellent in toughness.
- the average particle diameter of the olefin-based rubber particles is 2000 nm or less, the coverage of the shell layer is increased, and the transparency when used as a surface material is improved.
- a more preferable upper limit of the average particle diameter of the olefin rubber particles is 300 nm, and a more preferable upper limit is 100 nm.
- the average particle diameter of the olefin rubber particles can be measured using, for example, a laser diffraction particle size distribution measuring device.
- a laser diffraction particle size distribution measuring device Mastersizer 2000 (manufactured by Malvern) or the like can be used.
- the content of the olefinic rubber particles is preferably 5.0 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound, and 80 parts by weight with respect to the preferred upper limit.
- the content of the olefinic rubber particles is 5.0 parts by weight or more, the cured product of the obtained sealing agent for organic EL display elements is more excellent in toughness.
- the content of the olefinic rubber particles is 80 parts by weight or less, the cured product of the obtained sealing agent for organic EL display elements is more excellent in barrier properties.
- the minimum with more preferable content of the said olefin type rubber particle is 10 weight part, and a more preferable upper limit is 70 weight part.
- the sealing agent for organic EL display elements of this invention contains a photocationic polymerization initiator.
- the photocationic polymerization initiator is not particularly limited as long as it generates a protonic acid or a Lewis acid by light irradiation, and may be an ionic photoacid generating type or a nonionic photoacid generating type. May be.
- Examples of the ionic photoacid-generating photocationic polymerization initiator include an anion moiety of BF 4 ⁇ , PF 6 ⁇ , SbF 6 ⁇ , or (BX 4 ) ⁇ (wherein X is at least two or more.
- aromatic sulfonium salt examples include bis (4- (diphenylsulfonio) phenyl) sulfide bishexafluorophosphate, bis (4- (diphenylsulfonio) phenyl) sulfide bishexafluoroantimonate, and bis (4- ( Diphenylsulfonio) phenyl) sulfide bistetrafluoroborate, bis (4- (diphenylsulfonio) phenyl) sulfide tetrakis (pentafluorophenyl) borate, diphenyl-4- (phenylthio) phenylsulfonium hexafluorophosphate, diphenyl-4- ( Phenylthio) phenylsulfonium hexafluoroantimonate, diphenyl-4- (phenylthio) phenylsulfonium tetraflu
- aromatic iodonium salt examples include diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium tetrafluoroborate, diphenyliodonium tetrakis (pentafluorophenyl) borate, bis (dodecylphenyl) iodonium hexafluorophosphate, bis (Dodecylphenyl) iodonium hexafluoroantimonate, bis (dodecylphenyl) iodonium tetrafluoroborate, bis (dodecylphenyl) iodonium tetrakis (pentafluorophenyl) borate, 4-methylphenyl-4- (1-methylethyl) phenyliodonium hexa Fluorophosphate, 4-methylphenyl-4- (1-methylethy
- aromatic diazonium salt examples include phenyldiazonium hexafluorophosphate, phenyldiazonium hexafluoroantimonate, phenyldiazonium tetrafluoroborate, and phenyldiazonium tetrakis (pentafluorophenyl) borate.
- aromatic ammonium salt examples include 1-benzyl-2-cyanopyridinium hexafluorophosphate, 1-benzyl-2-cyanopyridinium hexafluoroantimonate, 1-benzyl-2-cyanopyridinium tetrafluoroborate, 1-benzyl -2-Cyanopyridinium tetrakis (pentafluorophenyl) borate, 1- (naphthylmethyl) -2-cyanopyridinium hexafluorophosphate, 1- (naphthylmethyl) -2-cyanopyridinium hexafluoroantimonate, 1- (naphthylmethyl)
- Examples include -2-cyanopyridinium tetrafluoroborate and 1- (naphthylmethyl) -2-cyanopyridinium tetrakis (pentafluorophenyl) borate.
- Examples of the (2,4-cyclopentadien-1-yl) ((1-methylethyl) benzene) -Fe salt include (2,4-cyclopentadien-1-yl) ((1-methylethyl) benzene.
- nonionic photoacid-generating photocationic polymerization initiator examples include nitrobenzyl ester, sulfonic acid derivative, phosphoric acid ester, phenolsulfonic acid ester, diazonaphthoquinone, N-hydroxyimide sulfonate, and the like.
- photocationic polymerization initiators examples include, for example, DTS-200 (manufactured by Midori Chemical Co., Ltd.), UVI6990, UVI6974 (all manufactured by Union Carbide), SP-150, SP-170 (all ADEKA), FC-508, FC-512 (all from 3M), IRGACURE 261 (BASF), PI 2074 (Rhodia) and the like.
- the content of the cationic photopolymerization initiator is preferably 0.1 parts by weight and preferably 10 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the content of the cationic photopolymerization initiator is 0.1 parts by weight or more, the obtained sealing agent for organic EL display elements is more excellent in photocurability.
- the content of the cationic photopolymerization initiator is 10 parts by weight or less, the curing reaction of the obtained sealing agent for organic EL display elements does not become too fast, and the workability becomes excellent, and the cured product becomes more uniform. Can be.
- the minimum with more preferable content of the said photocationic polymerization initiator is 0.5 weight part, and a more preferable upper limit is 5 weight part.
- the sealing agent for organic EL display elements of the present invention contains an alkaline earth metal-based and / or magnesium-based water-absorbing filler.
- the cured product of the obtained sealing agent for organic EL display elements has excellent barrier properties.
- Examples of the alkaline earth metal-based and / or magnesium-based water-absorbing filler include calcium oxide, magnesium oxide, barium oxide, and strontium oxide.
- the alkaline earth metal-based water-absorbing filler and the magnesium-based water-absorbing filler are contained in combination, it is preferable to contain a combination of calcium oxide and magnesium oxide, and a double salt of calcium carbonate and magnesium carbonate. It is more preferable to contain light-burned dolomite obtained by heating dolomite.
- a preferable lower limit is 3.0 parts by weight and a preferable upper limit is 100 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the content of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 3.0 parts by weight or more, the cured product of the obtained sealing agent for organic EL display elements has better barrier properties. Become. When the content of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 100 parts by weight or less, the toughness of the cured product of the obtained sealing agent for organic EL display elements is improved, and cracks are generated.
- the more preferable lower limit of the content of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 5.0 parts by weight, and the more preferable upper limit is 80 parts by weight.
- the total surface area of the water-absorptive filler of the alkaline earth metal-based and / or magnesium-based is 10 m 2 per 100g the cationic polymerizable compound, the desirable upper limit is 200 meters 2.
- the total surface area of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 10 m 2 or more, the obtained cured product of the sealing agent for organic EL display elements has excellent barrier properties.
- the total surface area of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 200 m 2 or less, the toughness of the cured product of the obtained sealing agent for organic EL display elements is improved, and the occurrence of cracks and It will be more excellent in the effect which suppresses panel peeling.
- the preferable lower limit of the total surface area of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is 20 m 2
- the preferable upper limit is 150 m 2 .
- the total surface area of the alkaline earth metal-based and / or magnesium-based water-absorbing filler is calculated from the content of the alkaline-earth metal-based and / or magnesium-based water-absorbing filler and the BET specific surface area. Specifically, for example, it is calculated from the BET specific surface area measured using nitrogen gas with a specific surface area measuring device (manufactured by Shimadzu Corporation, ASAP-2000).
- the sealing agent for organic EL display elements of the present invention is used for the alkaline earth metal-based and / or magnesium-based water-absorbing fillers within the range not impairing the object of the present invention for the purpose of improving adhesiveness.
- other fillers may be contained.
- the other fillers include inorganic fillers such as silica, talc, and alumina, and organic fillers such as polyester fine particles, polyurethane fine particles, vinyl polymer fine particles, and acrylic polymer fine particles. Of these, talc is preferred because of its excellent effect of improving moisture resistance.
- the content of the other filler is such that a preferred lower limit is 5 parts by weight and a preferred upper limit is 100 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- a preferred lower limit is 5 parts by weight
- a preferred upper limit is 100 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the minimum with more preferable content of the said other filler is 10 weight part, and a more preferable upper limit is 80 weight part.
- the sealing agent for organic EL display elements of the present invention may contain a thermosetting agent.
- thermosetting agent include hydrazide compounds, imidazole derivatives, acid anhydrides, dicyandiamides, guanidine derivatives, modified aliphatic polyamines, addition products of various amines and epoxy resins, and the like.
- hydrazide compound examples include 1,3-bis (hydrazinocarbonoethyl-5-isopropylhydantoin), sebacic acid dihydrazide, isophthalic acid dihydrazide, adipic acid dihydrazide, malonic acid dihydrazide, and the like.
- imidazole derivatives examples include 1-cyanoethyl-2-phenylimidazole, N- (2- (2-methyl-1-imidazolyl) ethyl) urea, 2,4-diamino-6- (2′-methylimidazolyl- (1 ′))-ethyl-s-triazine, N, N′-bis (2-methyl-1-imidazolylethyl) urea, N, N ′-(2-methyl-1-imidazolylethyl) -adipamide, 2- Examples include phenyl-4-methyl-5-hydroxymethylimidazole and 2-phenyl-4,5-dihydroxymethylimidazole.
- acid anhydride examples include tetrahydrophthalic anhydride, ethylene glycol bis (anhydrotrimellitate), and the like. These thermosetting agents may be used independently and 2 or more types may be used together.
- thermosetting agents examples include SDH (manufactured by Nippon Finechem Co., Ltd.), ADH (manufactured by Otsuka Chemical Co., Ltd.), Amicure VDH, Amicure VDH-J, Amicure UDH (all manufactured by Ajinomoto Fine Techno Co., Ltd.). ) And the like.
- the content of the thermosetting agent is preferably 0.5 parts by weight and preferably 30 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the content of the thermosetting agent is 0.5 parts by weight or more, the obtained sealing agent for organic EL display elements is more excellent in thermosetting.
- the content of the thermosetting agent is 30 parts by weight or less, the obtained sealing agent for organic EL display elements is excellent in storage stability, and the cured product is excellent in moisture resistance.
- the minimum with more preferable content of the said thermosetting agent is 1 weight part, and a more preferable upper limit is 15 weight part.
- the sealing agent for organic EL display elements of the present invention may contain a sensitizer.
- the sensitizer has a role of further improving the polymerization initiation efficiency of the photocationic polymerization initiator and further promoting the curing reaction of the encapsulant for organic EL display elements of the present invention.
- the sensitizer examples include anthracene compounds such as 9,10-dibutoxyanthracene, thioxanthone compounds such as 2,4-diethylthioxanthone, 2,2-dimethoxy-1,2-diphenylethane-1, and the like.
- anthracene compounds such as 9,10-dibutoxyanthracene
- thioxanthone compounds such as 2,4-diethylthioxanthone, 2,2-dimethoxy-1,2-diphenylethane-1, and the like.
- -One benzophenone, 2,4-dichlorobenzophenone, methyl o-benzoylbenzoate, 4,4'-bis (dimethylamino) benzophenone, 4-benzoyl-4'methyldiphenyl sulfide, and the like.
- the content of the sensitizer is preferably 0.05 parts by weight and preferably 3 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the sensitizing effect is more exhibited.
- the content of the sensitizer is 3 parts by weight or less, light can be transmitted to a deep part without excessive absorption.
- the minimum with more preferable content of the said sensitizer is 0.1 weight part, and a more preferable upper limit is 1 weight part.
- the sealing agent for organic EL display elements of the present invention preferably contains a stabilizer for the purpose of improving storage stability.
- the stabilizer include amine compounds and aminophenol type epoxy resins.
- the content of the stabilizer is preferably 0.001 part by weight and preferably 2 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the minimum with more preferable content of the said stabilizer is 0.05 weight part, and a more preferable upper limit is 1 weight part.
- the sealing agent for organic EL display elements of the present invention may contain a silane coupling agent.
- the said silane coupling agent has a role which improves the adhesiveness of the sealing agent for organic EL display elements of this invention, a board
- silane coupling agent examples include 3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-isocyanatopropyltrimethoxysilane, and the like. These silane coupling agents may be used independently and 2 or more types may be used together.
- the content of the silane coupling agent is preferably 0.1 parts by weight and preferably 10 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound.
- the minimum with more preferable content of the said silane coupling agent is 0.5 weight part, and a more preferable upper limit is 5 weight part.
- the sealing agent for organic EL display elements of the present invention may contain a surface modifier as long as the object of the present invention is not impaired.
- a surface modifier By containing the surface modifier, the flatness of the coating film can be imparted to the organic EL display element sealant of the present invention.
- the surface modifier include surfactants and leveling agents.
- surfactant and the leveling agent examples include silicon-based, acrylic-based, and fluorine-based ones.
- examples of commercially available surfactants and leveling agents include BYK-345, BYK-340 (both manufactured by Big Chemie Japan), Surflon S-611 (manufactured by AGC Seimi Chemical), and the like. Can be mentioned.
- the encapsulant for organic EL display elements of the present invention may contain an ion exchange resin in order to improve the durability of the element electrode as long as the object of the present invention is not impaired.
- any of a cation exchange type, an anion exchange type, and a both ion exchange type can be used, and in particular, a cation exchange type or a both ion exchange type capable of adsorbing chloride ions. Is preferred.
- the sealing agent for organic EL display elements of this invention is a range which does not inhibit the objective of this invention, and is a hardening retarder, a reinforcing agent, a softener, a plasticizer, a viscosity modifier, and an ultraviolet absorber as needed. Further, various known additives such as antioxidants may be contained.
- Examples of the method for producing the sealing agent for organic EL display elements of the present invention include a cationically polymerizable compound using a mixer such as a homodisper, a homomixer, a universal mixer, a planetary mixer, a kneader, or a three roll. And a method of mixing olefinic rubber particles, a cationic photopolymerization initiator, an alkaline earth metal-based and / or magnesium-based water-absorbing filler, and an additive to be added as necessary.
- the olefin rubber particles may be previously dispersed in the cationic polymerizable compound and then mixed with other components.
- the sealing agent for organic EL display elements of the present invention is intended for in-plane sealing
- the preferred lower limit of the viscosity at 25 ° C. measured using an E-type viscometer is 50 mPa ⁇ s
- the preferred upper limit is 8000 mPa ⁇ s. s.
- the more preferable lower limit of the viscosity is 60 mPa ⁇ s
- the more preferable upper limit is 3000 mPa ⁇ s
- the still more preferable lower limit is 70 mPa ⁇ s
- the still more preferable upper limit is 1000 mPa ⁇ s.
- the viscosity is, for example, a VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E-type viscometer, and a rotational speed of 1 to 100 rpm as appropriate from the optimum torque number in each viscosity region using a CP1 cone plate. Can be measured by selecting.
- the sealing agent for organic EL display elements of the present invention aims at peripheral sealing
- the preferred lower limit of viscosity at 25 ° C. measured with an E-type viscometer is 100 Pa ⁇ s
- the preferred upper limit is 500 Pa ⁇ s. It is.
- a more preferable lower limit of the viscosity is 200 Pa ⁇ s
- a more preferable upper limit is 400 Pa ⁇ s
- a still more preferable lower limit is 250 Pa ⁇ s
- a still more preferable upper limit is 350 Pa ⁇ s.
- the viscosity is, for example, a VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E-type viscometer, and a rotational speed of 1 to 100 rpm as appropriate from the optimum torque number in each viscosity region using a CP7 cone plate. Can be measured by selecting.
- the shape of the sealing portion formed in the organic EL display element sealant of the present invention is not particularly limited as long as it is a shape that can protect the laminate having the organic light emitting material layer from the outside air.
- the shape may be completely covered, a closed pattern may be formed in the periphery of the laminate, or a pattern having a shape in which a part of the opening is provided in the periphery of the laminate is formed.
- it can be suitably used for sealing the peripheral portion of the laminate.
- the sealing compound for organic electroluminescent display elements which is excellent in the barrier property and toughness of hardened
- 300 parts by weight of deionized water was put into a reaction vessel containing 1500 parts by weight of the latex (X-1) containing the polybutadiene rubber particles obtained, and stirred at 50 ° C. in a nitrogen atmosphere. Further, after adding 0.01 parts by weight of ethylenediaminetetraacetic acid disodium, 0.005 parts by weight of iron, and 0.24 parts by weight of sodium formaldehyde sulfoxylate, 90 parts by weight of methyl methacrylate as a graft monomer, t- 0.08 part by weight of butyl hydroperoxide was added over 2 hours to allow graft polymerization to proceed.
- Polymerization was terminated after 2 hours from the start of the polymerization reaction, and a latex containing olefin rubber particles A having a core-shell structure was obtained.
- the average particle diameter of the obtained olefin rubber particles A having a core-shell structure was 100 nm.
- olefin rubber particles B having a core-shell structure instead of 100 parts by weight of butadiene, 75 parts by weight of butadiene and 25 parts by weight of styrene were added to the reaction vessel in the same manner as in “(Preparation of olefin rubber particles A having a core-shell structure)” above.
- Olefin-based rubber particles B (average particle diameter of 100 nm) having a core-shell structure whose core layer is made of butadiene-styrene rubber were prepared.
- Example 1 As cationically polymerizable compounds, 80 parts by weight of bisphenol F type epoxy resin (manufactured by DIC, “EPICLON EXA-830LVP”) and 20 parts by weight of solid bisphenol F type epoxy resin (manufactured by Mitsubishi Chemical Corporation, “jER 4005P”) Then, 50 parts by weight of the prepared olefin rubber particles A having a core-shell structure were added and stirred and mixed uniformly. Next, 1.0 part by weight of an aromatic iodonium salt (“PI2074” manufactured by Rhodia Co., Ltd.) as a photocationic polymerization initiator is added and dissolved by heating at 60 ° C. for 1 hour, and then 9,10-dibutoxy as a sensitizer.
- PI2074 aromatic iodonium salt
- Examples 2 to 12, Comparative Examples 1 to 5 Each material of the mixture ratio described in Table 1 and Table 2 was stirred and mixed in the same manner as in Example 1 to prepare an organic EL display element sealant.
- Viscosity About each sealing agent for organic EL display elements obtained in Examples and Comparative Examples, the viscosity at 25 ° C. was measured using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd., “VISCOMETER TV-22”). (Initial viscosity) was measured.
- a glass substrate on which a glass substrate on which Ca is deposited is moved into a glow box controlled at a dew point ( ⁇ 60 ° C. or higher), and a sealing agent for each organic EL display element obtained in the examples and comparative examples is applied to the surface. Were pasted together. At this time, bonding was performed so that the deposited Ca exists at positions of 2 mm, 4 mm, and 6 mm from the end face of the glass substrate. Subsequently, ultraviolet rays of 365 nm were irradiated at 3000 mJ / cm 2 and further heated at 80 ° C. for 30 minutes to cure the sealing agent, thereby producing a Ca-TEST substrate.
- the obtained Ca-TEST substrate was exposed to high-temperature and high-humidity conditions of 85 ° C. and 85% RH, and the moisture penetration distance per hour was observed from the disappearance of Ca.
- ⁇ indicates that the time required for the moisture penetration distance to reach 6 mm is 1000 hours or more
- ⁇ indicates that the time is 500 hours or more and less than 1000 hours
- ⁇ indicates 100 hours or more and 500 hours.
- x the barrier property of the cured product was evaluated.
- a glass substrate (length 25 mm, width 25 mm, thickness 0.7 mm) on which an ITO electrode was formed to a thickness of 1000 mm was used as the substrate.
- the substrate was ultrasonically washed with acetone, an aqueous alkali solution, ion-exchanged water, and isopropyl alcohol for 15 minutes, respectively, then washed with boiled isopropyl alcohol for 10 minutes, and a UV-ozone cleaner (manufactured by Nippon Laser Electronics Co., Ltd.). The last treatment was performed with “NL-UV253”).
- this substrate is fixed to the substrate folder of the vacuum deposition apparatus, and 200 mg of N, N′-di (1-naphthyl) -N, N′-diphenylbenzidine ( ⁇ -NPD) is put into an unglazed crucible and other different types.
- 200 mg of tris (8-quinolinolato) aluminum (Alq 3 ) was put in an unglazed crucible, and the inside of the vacuum chamber was depressurized to 1 ⁇ 10 ⁇ 4 Pa. Thereafter, the crucible containing ⁇ -NPD was heated, and ⁇ -NPD was deposited on the substrate at a deposition rate of 15 s / s to form a 600 ⁇ ⁇ hole transport layer.
- the crucible containing Alq 3 was heated to form an organic light emitting material layer having a thickness of 600 ⁇ at a deposition rate of 15 ⁇ / s. Thereafter, the substrate on which the hole transport layer and the organic light emitting material layer are formed is transferred to another vacuum vapor deposition apparatus, and 200 mg of lithium fluoride is added to a tungsten resistance heating boat in the vacuum vapor deposition apparatus, and aluminum is added to another tungsten boat. 1.0 g of wire was added.
- the inside of the vapor deposition unit of the vacuum vapor deposition apparatus is depressurized to 2 ⁇ 10 ⁇ 4 Pa to form a lithium fluoride film with a thickness of 5 mm at a deposition rate of 0.2 kg / s, and then aluminum with a film thickness of 1000 mm at a rate of 20 kg / s did.
- the inside of the vapor deposition unit was returned to normal pressure with nitrogen, and the substrate on which the laminate having the organic light emitting material layer of 10 mm ⁇ 10 mm was arranged was taken out.
- a mask having an opening of 13 mm ⁇ 13 mm was placed so as to cover the entire laminated body of the substrate on which the obtained laminated body was arranged, and an inorganic material film A was formed by a plasma CVD method.
- SiH 4 gas and nitrogen gas are used as source gases, the flow rates of each are SiH 4 gas 10 sccm, nitrogen gas 200 sccm, RF power 10 W (frequency 2.45 GHz), chamber temperature 100 ° C., chamber The test was performed under the condition that the internal pressure was 0.9 Torr.
- the formed inorganic material film A had a thickness of about 1 ⁇ m.
- Vacuum deposition was performed so that Thereafter, ultraviolet rays having a wavelength of 365 nm were irradiated using a high pressure mercury lamp in a vacuum environment so that the irradiation amount was 3000 mJ / cm 2 to cure the organic EL display element sealant to form a resin protective film.
- a mask having an opening of 12 mm ⁇ 12 mm is installed so as to cover the entire resin protective film, and the inorganic material film B is formed by plasma CVD to form an organic EL display element. Obtained.
- SiH 4 gas and nitrogen gas are used as source gases, the flow rates of each are SiH 4 gas 10 sccm, nitrogen gas 200 sccm, RF power 10 W (frequency 2.45 GHz), chamber temperature 100 ° C., chamber The test was performed under the condition that the internal pressure was 0.9 Torr.
- the formed inorganic material film B had a thickness of about 1 ⁇ m.
- the sealing compound for organic electroluminescent display elements which is excellent in the barrier property and toughness of hardened
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Abstract
Description
しかしながら、このようなトップエミッション方式の有機EL表示素子では、光の取り出し方向を遮蔽してしまわないようにするために乾燥剤を配置するスペースがなく、充分な防湿効果が得られにくく寿命が短くなるという問題があった。
以下に本発明を詳述する。
そこで、本発明者は鋭意検討した結果、樹脂成分としてカチオン重合性化合物とコアシェル構造を有するオレフィン系ゴム粒子とを組み合わせて用い、該アルカリ土類金属系及び/又はマグネシウム系の吸水性フィラーを分散させることで、硬化物のバリア性及び靱性の両方に優れる有機EL表示素子用封止剤を得ることができることを見出し、本発明を完成させるに至った。
上記カチオン重合性化合物としては、カチオン重合性基として、例えば、エポキシ基、オキセタニル基、ビニルエーテル基等を有する化合物が挙げられる。
上記オレフィン系ゴム粒子は、コアシェル構造を有する。
上記コアシェル構造を有するオレフィン系ゴム粒子を含有することにより、得られる有機EL表示素子用封止剤の硬化物が靱性に優れるものとなる。また、オレフィン系ゴム粒子は、他のゴム粒子に比べて分解性が低いため、アウトガスの発生を抑制する効果も有する。
また、上記共役ジエン系ゴムは、ガラス転移温度(Tg)が0℃以下であることが好ましい。
なお、本明細書において上記「(メタ)アクリル」は、アクリル又はメタクリルを意味する。
なお、本明細書において上記「(メタ)アクリレート」は、アクリレート又はメタクリレートを意味し、上記「(メタ)アクリロイル」は、アクリロイル又はメタクリロイルを意味する。
なお、上記オレフィン系ゴム粒子の平均粒子径は、例えば、レーザー回折式粒度分布測定装置等を用いて測定することができる。上記レーザー回折式粒度分布測定装置としては、マスターサイザー2000(マルバーン社製)等を用いることができる。
上記光カチオン重合開始剤は、光照射によりプロトン酸又はルイス酸を発生するものであれば特に限定されず、イオン性光酸発生型であってもよいし、非イオン性光酸発生型であってもよい。
また、アルカリ土類金属系の吸水性フィラーとマグネシウム系の吸水性フィラーとを組み合わせて含有する場合、酸化カルシウムと酸化マグネシウムとを組み合わせて含有することが好ましく、炭酸カルシウムと炭酸マグネシウムとの複塩であるドロマイトを加熱することにより得られる軽焼ドロマイトを含有することがより好ましい。
なお、上記アルカリ土類金属系及び/又はマグネシウム系の吸水性フィラーの総表面積は、上記アルカリ土類金属系及び/又はマグネシウム系の吸水性フィラーの含有量とBET比表面積とから算出される。具体的には、例えば、比表面積測定装置(島津製作所社製、ASAP-2000)で窒素ガスを用い測定したBET比表面積から算出する。
上記その他のフィラーとしては、例えば、シリカ、タルク、アルミナ等の無機フィラーや、ポリエステル微粒子、ポリウレタン微粒子、ビニル重合体微粒子、アクリル重合体微粒子等の有機フィラー等が挙げられる。なかでも、耐湿性を向上させる効果に優れることから、タルクが好ましい。
上記イミダゾール誘導体としては、例えば、1-シアノエチル-2-フェニルイミダゾール、N-(2-(2-メチル-1-イミダゾリル)エチル)尿素、2,4-ジアミノ-6-(2’-メチルイミダゾリル-(1’))-エチル-s-トリアジン、N,N’-ビス(2-メチル-1-イミダゾリルエチル)尿素、N,N’-(2-メチル-1-イミダゾリルエチル)-アジポアミド、2-フェニル-4-メチル-5-ヒドロキシメチルイミダゾール、2-フェニル-4,5-ジヒドロキシメチルイミダゾール等が挙げられる。
上記酸無水物としては、例えば、テトラヒドロ無水フタル酸、エチレングリコールビス(アンヒドロトリメリテート)等が挙げられる。
これらの熱硬化剤は、単独で用いられてもよいし、2種以上が併用されてもよい。
上記安定剤としては、例えば、アミン系化合物やアミノフェノール型エポキシ樹脂等が挙げられる。
上記表面改質剤としては、例えば、界面活性剤やレベリング剤等が挙げられる。
上記界面活性剤や上記レベリング剤のうち市販されているものとしては、例えば、BYK-345、BYK-340(いずれもビックケミー・ジャパン社製)、サーフロンS-611(AGCセイミケミカル社製)等が挙げられる。
なお、上記粘度は、例えば、E型粘度計としてVISCOMETER TV-22(東機産業社製)を用い、CP1のコーンプレートにて、各粘度領域における最適なトルク数から適宜1~100rpmの回転数を選択することにより測定することができる。
なお、上記粘度は、例えば、E型粘度計としてVISCOMETER TV-22(東機産業社製)を用い、CP7のコーンプレートにて、各粘度領域における最適なトルク数から適宜1~100rpmの回転数を選択することにより測定することができる。
酸素を充分に除去し窒素置換を行った反応容器に、ブタジエン100重量部、脱イオン水200重量部、リン酸三カリウム0.05重量部、リン酸二水素カリウム0.04重量部、エチレンジアミン四酢酸二ナトリウム0.002重量部、硫酸第一鉄7水和塩0.001重量部、及び、ドデシルベンゼンスルホン酸ナトリウム1.5重量部を投入し、45℃で撹拌混合した。次に、パラメンタンハイドロパーオキサイド0.015重量部とナトリウムホルムアルデヒドスルホキシレート0.04重量部とを投入し、重合反応を開始させた。重合反応開始から5時間後に追加のパラメンタンハイドロパーオキサイド0.01重量部と、エチレンジアミン四酢酸二ナトリウム0.002重量部と、鉄0.001重量部とを投入した。重合反応開始から10時間後に残存モノマーを除去して重合を終了し、ポリブタジエンゴム粒子を含むラテックス(X-1)を得た。
得られたポリブタジエンゴム粒子を含むラテックス(X-1)1500重量部の入った反応容器に脱イオン水300重量部を投入し、窒素雰囲気下中にて50℃で撹拌した。更に、エチレンジアミン四酢酸二ナトリウム0.01重量部と、鉄0.005重量部と、ナトリウムホルムアルデヒドスルホキシレート0.24重量部とを加えた後、グラフトモノマーとしてメチルメタクリレート90重量部と、t-ブチルハイドロパーオキサイド0.08重量部とを2時間かけて添加し、グラフト重合を進行させた。重合反応開始から2時間後に重合を終了し、コアシェル構造を有するオレフィン系ゴム粒子Aを含有するラテックスを得た。
得られたコアシェル構造を有するオレフィン系ゴム粒子Aの平均粒子径は100nmであった。
ブタジエン100重量部に代えて、ブタジエン75重量部とスチレン25重量部とを反応容器中に投入したこと以外は、上記「(コアシェル構造を有するオレフィン系ゴム粒子Aの作製)」と同様にして、コア層がブタジエン-スチレンゴムからなるコアシェル構造を有するオレフィン系ゴム粒子B(平均粒子径100nm)を作製した。
グラフトモノマーとして、メチルメタクリレート90重量部の代わりに、メチルメタクリレート80重量部及びトリアリルイソシアヌレート10重量部の混合物を用いたこと以外は上記「(コアシェル構造を有するオレフィン系ゴム粒子Aの作製)」と同様にして、コア層がブタジエン-スチレンゴムからなるコアシェル構造を有するオレフィン系ゴム粒子C(平均粒子径100nm)を作製した。
カチオン重合性化合物として、ビスフェノールF型エポキシ樹脂(DIC社製、「EPICLON EXA-830LVP」)80重量部、及び、固形のビスフェノールF型エポキシ樹脂(三菱化学社製、「jER 4005P」)20重量部に、作製したコアシェル構造を有するオレフィン系ゴム粒子Aを50重量部を添加し均一に撹拌混合した。次いで、光カチオン重合開始剤として芳香族ヨードニウム塩(ローディア社製、「PI2074」)1.0重量部を添加し、60℃で1時間加熱溶解した後、増感剤として9,10-ジブトキシアントラセン0.2重量部、シランカップリング剤として3-グリシドキシプロピルトリメトキシシラン(信越化学工業社製、「KBM-403」)3.0重量部、吸水性フィラーとして酸化カルシウム(吉沢石灰工業社製、「生石灰J1P」、比表面積2.5m2/g)40重量部、及び、その他のフィラーとしてタルク(日本タルク社製、「MICRO ACE FG-15」)50重量部を添加し、撹拌混合機(シンキー社製、「AR-250」)を用い、撹拌速度3000rpmで均一に撹拌混合して、有機EL表示素子用封止剤を作製した。
表1、及び、表2に記載された配合比の各材料を、実施例1と同様にして撹拌混合して、有機EL表示素子用封止剤を作製した。
実施例及び比較例で得られた各有機EL表示素子用封止剤について、以下の評価を行った。結果を表1、及び、表2に示した。
実施例及び比較例で得られた各有機EL表示素子用封止剤について、E型粘度計(東機産業社製、「VISCOMETER TV-22」)を用いて、25℃における粘度(初期粘度)を測定した。
実施例及び比較例で得られた各有機EL表示素子用封止剤について、以下のCa-TESTを行った。
まず、30mm×30mmのガラス基板に2mm×2mmの開口部を複数有するマスクを被せ、Caを真空蒸着機により蒸着させた。蒸着の条件は、真空蒸着装置の蒸着器内を2×10-3Paまで減圧してCaを5.0Å/sの蒸着速度で2000Å成膜するものとした。Caを蒸着したガラス基板を露点(-60℃以上)に管理されたグローボックス内に移動させ、表面に実施例及び比較例で得られた各有機EL表示素子用封止剤を塗布したガラス基板を貼り合わせた。この時、ガラス基板端面から2mm、4mm、6mmの位置に蒸着したCaが存在するように貼り合わせた。次いで、365nmの紫外線を3000mJ/cm2照射し、更に、80℃で30分加熱することで封止剤を硬化させCa-TEST基板を作製した。得られたCa-TEST基板を、85℃、85%RHの高温高湿条件に暴露し、時間毎の水分の浸入距離をCaの消失から観測した。
Ca-TESTの結果、水分の浸入距離が6mmに達するまでの時間が1000時間以上であったものを「◎」、500時間以上1000時間未満であった場合を「○」、100時間以上500時間未満であった場合を「△」、100時間未満であった場合を「×」として硬化物のバリア性を評価した。
実施例及び比較例で得られた各有機EL表示素子用封止剤に365nmの紫外線を3000mJ/cm2照射し、更に、80℃で30分加熱することにより硬化物を得た。得られた硬化物について、JIS R1607(IF法)に従い、破壊靱性値KICを求めた。その結果、破壊靱性値KICの値が1.0以上であった場合を「○」、0.8以上1.0未満であった場合を「△」、0.8未満であった場合を「×」として硬化物の靱性を評価した。
(有機発光材料層を有する積層体が配置された基板の作製)
ガラス基板(長さ25mm、幅25mm、厚さ0.7mm)にITO電極を1000Åの厚さで成膜したものを基板とした。上記基板をアセトン、アルカリ水溶液、イオン交換水、イソプロピルアルコールにてそれぞれ15分間超音波洗浄した後、煮沸させたイソプロピルアルコールにて10分間洗浄し、更に、UV-オゾンクリーナ(日本レーザー電子社製、「NL-UV253」)にて直前処理を行った。
次に、この基板を真空蒸着装置の基板フォルダに固定し、素焼きの坩堝にN,N’-ジ(1-ナフチル)-N,N’-ジフェニルベンジジン(α-NPD)を200mg、他の異なる素焼き坩堝にトリス(8-キノリノラト)アルミニウム(Alq3)を200mg入れ、真空チャンバー内を、1×10-4Paまで減圧した。その後、α-NPDの入った坩堝を加熱し、α-NPDを蒸着速度15Å/sで基板に堆積させ、膜厚600Åの正孔輸送層を成膜した。次いで、Alq3の入った坩堝を加熱し、15Å/sの蒸着速度で膜厚600Åの有機発光材料層を成膜した。その後、正孔輸送層及び有機発光材料層が形成された基板を別の真空蒸着装置に移し、この真空蒸着装置内のタングステン製抵抗加熱ボートにフッ化リチウム200mgを、別のタングステン製ボートにアルミニウム線1.0gを入れた。その後、真空蒸着装置の蒸着器内を2×10-4Paまで減圧してフッ化リチウムを0.2Å/sの蒸着速度で5Å成膜した後、アルミニウムを20Å/sの速度で1000Å成膜した。窒素により蒸着器内を常圧に戻し、10mm×10mmの有機発光材料層を有する積層体が配置された基板を取り出した。
得られた積層体が配置された基板の、該積層体全体を覆うように、13mm×13mmの開口部を有するマスクを設置し、プラズマCVD法にて無機材料膜Aを形成した。
プラズマCVD法は、原料ガスとしてSiH4ガス及び窒素ガスを用い、各々の流量をSiH4ガス10sccm、窒素ガス200sccmとし、RFパワーを10W(周波数2.45GHz)、チャンバー内温度を100℃、チャンバー内圧力を0.9Torrとする条件で行った。
形成された無機材料膜Aの厚さは、約1μmであった。
真空装置内に、無機材料膜Aで被覆された積層体が配置された基板を設置し、真空装置の中に設置された加熱ボートに実施例及び比較例で得られた各有機EL表示素子用封止剤を0.5g入れ、10Paに減圧して、積層体を含む11mm×11mmの四角形の部分に、有機EL表示素子用封止剤を200℃にて加熱し、厚さが0.5μmになるように真空蒸着を行った。その後、真空環境下で高圧水銀灯を用いて波長365nmの紫外線を照射量が3000mJ/cm2となるように照射して、有機EL表示素子用封止剤を硬化させて樹脂保護膜を形成した。
樹脂保護膜を形成した後、該樹脂保護膜の全体を覆うように、12mm×12mmの開口部を有するマスクを設置し、プラズマCVD法にて無機材料膜Bを形成して有機EL表示素子を得た。
プラズマCVD法は、原料ガスとしてSiH4ガス及び窒素ガスを用い、各々の流量をSiH4ガス10sccm、窒素ガス200sccmとし、RFパワーを10W(周波数2.45GHz)、チャンバー内温度を100℃、チャンバー内圧力を0.9Torrとする条件で行った。
形成された無機材料膜Bの厚さは、約1μmであった。
得られた有機EL表示素子を、85℃、85%RHの環境下に500時間暴露した後のパネルの接着状態を目視にて観察した。パネル剥がれがなかった場合を「○」、パネル剥がれが一部確認された場合を「△」、パネル剥がれが大部分から確認された場合を「×」としてパネルの接着状態を評価した。
上記「(4)パネルの接着状態」と同様にして得られた有機EL表示素子を、85℃、85%RHの環境下に500時間暴露した後、3Vの電圧を印加し、有機EL表示素子の発光状態(ダークスポット及び画素周辺消光の有無)を目視で観察した。ダークスポットや周辺消光が無く均一に発光した場合を「○」、僅かでもダークスポットや周辺消光が認められた場合を「×」として有機EL表示素子の信頼性を評価した。
Claims (5)
- カチオン重合性化合物と、オレフィン系ゴム粒子と、光カチオン重合開始剤と、アルカリ土類金属系及び/又はマグネシウム系の吸水性フィラーとを含有し、
前記オレフィン系ゴム粒子は、コアシェル構造を有する
ことを特徴とする有機エレクトロルミネッセンス表示素子用封止剤。 - オレフィン系ゴム粒子は、共役ジエン系ゴムからなるコア層と、重合性不飽和二重結合を有する化合物に由来するセグメントを有する樹脂からなるシェル層とを有することを特徴とする請求項1記載の有機エレクトロルミネッセンス表示素子用封止剤。
- オレフィン系ゴム粒子の含有量が、カチオン重合性化合物100重量部に対して、5.0~80重量部であることを特徴とする請求項1又は2記載の有機エレクトロルミネッセンス表示素子用封止剤。
- アルカリ土類金属系及び/又はマグネシウム系の吸水性フィラーとして、酸化カルシウム及び/又は酸化マグネシウムを含有することを特徴とする請求項1、2又は3記載の有機エレクトロルミネッセンス表示素子用封止剤。
- アルカリ土類金属系の吸水性フィラーとして、比表面積が10.0m2/g未満の酸化カルシウムを含有することを特徴とする請求項4記載の有機エレクトロルミネッセンス表示素子用封止剤。
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| JP2018095679A (ja) * | 2016-12-08 | 2018-06-21 | 三井化学株式会社 | シート状シール材、表示素子シール材、有機el素子用面封止材、有機elデバイス、および有機elデバイスの製造方法 |
| WO2018151002A1 (ja) * | 2017-02-14 | 2018-08-23 | 積水化学工業株式会社 | 光硬化性樹脂組成物、有機el表示素子用封止剤、有機el表示素子、量子ドットデバイス用封止剤、及び、量子ドットデバイス |
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| CN110268802A (zh) * | 2017-06-28 | 2019-09-20 | 积水化学工业株式会社 | 有机el显示元件用面内密封剂和有机el显示元件用密封剂套件 |
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| KR102549655B1 (ko) * | 2017-02-14 | 2023-06-30 | 세키스이가가쿠 고교가부시키가이샤 | 광경화성 수지 조성물, 유기 el 표시 소자용 밀봉제, 유기 el 표시 소자, 양자 도트 디바이스용 밀봉제, 및 양자 도트 디바이스 |
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