WO2015064410A1 - 有機el表示素子用封止剤 - Google Patents
有機el表示素子用封止剤 Download PDFInfo
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- WO2015064410A1 WO2015064410A1 PCT/JP2014/077821 JP2014077821W WO2015064410A1 WO 2015064410 A1 WO2015064410 A1 WO 2015064410A1 JP 2014077821 W JP2014077821 W JP 2014077821W WO 2015064410 A1 WO2015064410 A1 WO 2015064410A1
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- display elements
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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
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
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- 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
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
-
- 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
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
- C08G59/22—Di-epoxy compounds
- C08G59/24—Di-epoxy compounds carbocyclic
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- 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
Definitions
- the present invention relates to a sealant for organic EL display elements that can suppress the generation of outgas and is excellent in applicability.
- organic electroluminescence (organic EL) display elements and organic thin film solar cell elements have been advanced.
- the organic thin film element can be easily produced by vacuum deposition, solution coating, or the like, and thus has excellent productivity.
- the organic EL display element has a thin film structure in which an organic light emitting material layer is sandwiched between a pair of electrodes facing each other. When electrons are injected from one electrode into the organic light emitting material layer and holes are injected from the other electrode, electrons and holes are combined in the organic light emitting material layer to perform self-light emission. Compared with a liquid crystal display element or the like that requires a backlight, the visibility is better, the thickness can be reduced, and direct current low voltage driving is possible.
- an organic EL display element has a problem that when the organic light emitting material layer and the electrode are exposed to the outside air, the light emission characteristics thereof are rapidly deteriorated and the life is shortened. Therefore, for the purpose of improving the stability and durability of the organic EL display element, in the organic EL display element, a sealing technique for shielding the organic light emitting material layer and the electrode from moisture and oxygen in the atmosphere is indispensable. Yes.
- Patent Document 1 discloses a method of sealing a top emission organic EL display element by filling a curable adhesive between organic EL display element substrates and irradiating light.
- a display element such as an organic EL display element is sealed using a curable adhesive in this way, outgas is generated during light irradiation or heating and fills the element, accelerating deterioration of the element. There was a problem that sometimes.
- An object of this invention is to provide the sealing agent for organic EL display elements which can suppress generation
- the present invention is an organic EL display element sealing agent containing a cationic curable resin and a cationic polymerization initiator, wherein the cationic curable resin has an epoxy group or an oxetanyl group, and an epoxy group.
- an organic EL display element sealing agent that does not have an ether bond and an ester bond other than those contained in the oxetanyl group, and was measured using an E-type viscometer at 25 ° C. and 1 to 100 rpm.
- This is a sealing agent for organic EL display elements having an overall viscosity of 80 to 5000 mPa ⁇ s.
- the present invention is described in detail below.
- the present inventors considered that the cause of outgas generation when a curable adhesive is used for sealing an organic EL display element is an ether bond or an ester bond contained in the curable resin used. That is, it was considered that the outgas was generated by the decomposition of the ether bond or the ester bond contained in the curable resin with an acid derived from an initiator or the like. For this reason, the use of a curable resin that does not contain an ether bond or an ester bond that causes outgassing was studied. Depending on the type of curable resin to be used, the obtained sealing agent for organic EL display elements was applied. It may become inferior.
- the present inventors have specified a cationic curable resin having an epoxy group or an oxetanyl group as the curable resin and not having an ether bond and an ester bond other than those contained in the epoxy group or oxetanyl group. As a result, it was found that outgassing can be suppressed and a sealing agent for organic EL display elements having excellent coating properties can be obtained, and the present invention has been completed.
- the sealing agent for organic EL display elements of the present invention contains a cationic curable resin.
- the cationic curable resin has an epoxy group or an oxetanyl group and does not have an ether bond and an ester bond other than those contained in the epoxy group or the oxetanyl group (hereinafter referred to as “cationic curing according to the present invention”). Also referred to as “resin”.
- the cation curable resin preferably contains a compound represented by the following formula (1) and / or a compound represented by the following formula (2), since generation of outgas can be effectively suppressed. From the viewpoint of curability and curing, it is more preferable to contain a compound represented by the following formula (1).
- 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.
- 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.
- the said cationic curable resin shows favorable cationic curability, it is preferable to contain the compound represented by following formula (4) as a compound represented by the said Formula (1).
- the cationic curable resin contains a compound represented by the following formula (5) as a compound represented by the above formula (2) because it exhibits good cationic curability and the cured product exhibits a high glass transition temperature. It is preferable to do.
- the cationic curable resin can easily adjust the curing retardation and viscosity of the obtained sealing agent for organic EL display elements, it is represented by the compound represented by the above formula (1) and the above formula (2). It is preferred to contain both compounds. Further, by containing the compound represented by the above formula (2) in addition to the compound represented by the above formula (1), it is possible to suppress the volatilization of the raw material until the curing reaction occurs, and to obtain the organic Application shape stability of the sealing agent for EL display elements is improved.
- the cationic curable resin contains both the compound represented by the formula (1) and the compound represented by the formula (2), it is represented by the compound represented by the formula (1) and the formula (2).
- cationic curable resin examples include dicyclopentadiene diepoxide and 1,2,5,6-diepoxycyclooctane.
- the sealing agent for organic EL display elements of the present invention increases the dispersibility of the filler described later and moderately adjusts the viscosity of the resulting sealing agent for organic EL display elements within a range that does not impair the object of the present invention.
- other cationic curable resins having an ether bond or an ester bond other than those contained in the epoxy group or oxetanyl group may be contained.
- the other cationic curable resin is at least one selected from the group consisting of an epoxy resin having a bisphenol skeleton, an epoxy resin having a novolac skeleton, an epoxy resin having a naphthalene skeleton, and an epoxy resin having a dicyclopentadiene skeleton.
- a kind of epoxy resin is preferable, an epoxy resin having a bisphenol skeleton is more preferable, and a bisphenol F-type epoxy resin is more preferable.
- the content of the cation curable resin according to the present invention is preferably 10 parts by weight and preferably 80 parts by weight with respect to 100 parts by weight of the whole cation curable resin. It is.
- the content of the cationic curable resin according to the present invention is less than 10 parts by weight or more than 80 parts by weight, the obtained sealing agent for organic EL display elements may be inferior in applicability.
- the more preferable lower limit of the content of the cationic curable resin according to the present invention is 20 parts by weight, and the more preferable upper limit is 70 parts by weight.
- the sealing agent for organic EL display elements of the present invention contains a cationic polymerization initiator.
- the cationic polymerization initiator include a photocationic polymerization initiator that generates a protonic acid or a Lewis acid by light irradiation, and a thermal cationic polymerization initiator that generates a protonic acid or a Lewis acid by heating. These are not particularly limited as long as they are ionic acid generating types or nonionic acid generating types.
- 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 those having a cation moiety of aromatic sulfonium, aromatic iodonium, aromatic diazonium, aromatic ammonium, or (2,4-cyclopentadien-1-yl). ) ((1-methylethyl) benzene) -Fe cation, and the anion portion is BF 4 ⁇ , PF 6 ⁇ , SbF 6 ⁇ , or (BX 4 ) ⁇ (where X is at least two or more fluorine atoms) Or an onium salt composed of a phenyl group substituted with a trifluoromethyl group).
- 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 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, IRGACURE 290 (all from BASF Japan), PI 2074 (from Rhodia), and the like.
- thermal cationic polymerization initiator examples include BF 4 ⁇ , PF 6 ⁇ , SbF 6 ⁇ , or (BX 4 ) ⁇ (wherein X is substituted with at least two fluorine or trifluoromethyl groups.
- a sulfonium salt, a phosphonium salt, a quaternary ammonium salt, a diazonium salt, an iodonium salt, and the like are preferred.
- sulfonium salts include triphenylsulfonium boron tetrafluoride, triphenylsulfonium hexafluoride antimony, triphenylsulfonium hexafluoride arsenic, tri (4-methoxyphenyl) sulfonium hexafluoride arsenic, and diphenyl (4-phenylthiophenyl). ) Sulfonium arsenic hexafluoride and the like.
- the phosphonium salt include ethyltriphenylphosphonium antimony hexafluoride and tetrabutylphosphonium antimony hexafluoride.
- Examples of the quaternary ammonium salt include dimethylphenyl (4-methoxybenzyl) ammonium hexafluorophosphate, dimethylphenyl (4-methoxybenzyl) ammonium hexafluoroantimonate, dimethylphenyl (4-methoxybenzyl) ammonium tetrakis (penta).
- Fluorophenyl) borate dimethylphenyl (4-methylbenzyl) ammonium hexafluorohexafluorophosphate, dimethylphenyl (4-methylbenzyl) ammonium hexafluoroantimonate, dimethylphenyl (4-methylbenzyl) ammonium hexafluorotetrakis (pentafluorophenyl) ) Borate, methylphenyldibenzylammonium, methylphenyldibenzylammonium hexaf Oroantimonate hexafluorophosphate, methylphenyldibenzylammonium trakis (pentafluorophenyl) borate, phenyltribenzylammonium tetrakis (pentafluorophenyl) borate, dimethylphenyl (3,4-dimethylbenzyl) ammonium tetrakis (pentafluorophenyl) Borate
- thermal cationic polymerization initiators examples include, for example, Adeka Opton CP-66, Adeka Opton CP-77 (both manufactured by ADEKA), and thermal cations having not only thermal activity but also photoactivity.
- Polymerization initiators such as Sun-Aid SI-60, Sun-Aid SI-80, Sun-Aid SI-100, Sun-Aid SI-110, Sun-Aid SI-180 (all manufactured by Sanshin Chemical Industry Co., Ltd.), CXC-1612, CXC-1738, CXC -1821 (all manufactured by King Industries).
- the content of the cationic polymerization initiator is preferably 0.1 parts by weight and preferably 10 parts by weight with respect to 100 parts by weight of the cationic curable resin. If the content of the cationic polymerization initiator is less than 0.1 parts by weight, the cationic polymerization may not proceed sufficiently, or the curing reaction may become too slow. When the content of the cationic polymerization initiator exceeds 10 parts by weight, the curing reaction of the resulting organic EL display element sealant becomes too fast, resulting in a decrease in workability or the resulting organic EL display element seal. The cured product of the stopper may become uneven.
- the minimum with more preferable content of the said cationic 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 may contain a sensitizer.
- the sensitizer has a role of further improving the polymerization initiation efficiency of the cationic polymerization initiator and further promoting the curing reaction of the sealant for organic EL display elements of the present invention.
- sensitizer examples include thioxanthone compounds such as 2,4-diethylthioxanthone, 2,2-dimethoxy-1,2-diphenylethane-1-one, benzophenone, 2,4-dichlorobenzophenone, o- Examples include methyl benzoylbenzoate, 4,4′-bis (dimethylamino) benzophenone, 4-benzoyl-4′methyldiphenyl sulfide, and the like.
- thioxanthone compounds such as 2,4-diethylthioxanthone, 2,2-dimethoxy-1,2-diphenylethane-1-one, benzophenone, 2,4-dichlorobenzophenone, o- Examples include methyl 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 curable resin.
- the sensitizing effect may not be sufficiently obtained.
- the content of the sensitizer exceeds 3 parts by weight, absorption may be excessively increased and light may not be transmitted to the deep part.
- 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 filler for the purpose of improving the moisture resistance of the cured product.
- a filler for the purpose of improving the moisture resistance of the cured product.
- the compound represented by the above formula (1) having a low viscosity is used as the cationic curable resin according to the present invention, a large amount of filler can be blended without deteriorating the coating property.
- the filler examples include talc, asbestos, silica, mica, diatomaceous earth, smectite, bentonite, calcium carbonate, magnesium carbonate, alumina, montmorillonite, zinc oxide, iron oxide, magnesium oxide, tin oxide, titanium oxide, and magnesium hydroxide.
- Inorganic fillers such as aluminum hydroxide, silicon nitride, barium sulfate, gypsum, calcium silicate, glass beads, sericite activated clay, bentonite, aluminum nitride, polyester fine particles, polyurethane fine particles, vinyl polymer fine particles, acrylic polymer fine particles, etc.
- the preferred lower limit of the content of the filler is 10 parts by weight and the preferred upper limit is 80 parts by weight with respect to 100 parts by weight of the cationic curable resin. If the content of the filler is less than 10 parts by weight, the effect of improving moisture resistance may not be sufficiently exhibited. When content of the said filler exceeds 80 weight part, the viscosity of the sealing agent for organic EL display elements obtained will become high too much, and applicability
- the minimum with more preferable content of the said filler is 15 weight part, and a more preferable upper limit is 70 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 cation curable resin.
- the content of the silane coupling agent is less than 0.1 parts by weight, the effect of improving the adhesiveness of the obtained sealing agent for organic EL display elements may not be sufficiently exhibited.
- content of the said silane coupling agent exceeds 10 weight part, an excess silane coupling agent may bleed out.
- 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 further contain a thermosetting agent as long as the object of the present invention is not impaired. By containing the said thermosetting agent, thermosetting property can be provided to the sealing agent for organic EL display elements of this invention.
- thermosetting agent is not particularly limited, and examples thereof 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 include 1,3-bis [hydrazinocarbonoethyl-5-isopropylhydantoin] and the like.
- imidazole derivative 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 (anhydro trimellitate), and the like. These thermosetting agents may be used alone or in combination of two or more.
- 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 curable resin.
- the content of the thermosetting agent is less than 0.5 parts by weight, sufficient thermosetting property may not be imparted to the obtained sealing agent for organic EL display elements.
- the content of the thermosetting agent exceeds 30 parts by weight, the storage stability of the obtained sealant for organic EL display elements becomes insufficient, or the cured product of the obtained sealant for organic EL display elements. Moisture resistance may deteriorate.
- 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 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 (manufactured by BYK Japan), BYK-340 (manufactured by BYK Japan), Surflon S-611 (AGC Seimi Chemical). Etc.).
- the encapsulant for organic EL display elements of the present invention reacts with the acid generated in the encapsulant for organic EL display elements in order to improve the durability of the element electrode within a range not impairing the object of the present invention.
- a compound or an ion exchange resin may be contained.
- Examples of the compound that reacts with the generated acid include substances that neutralize the acid, for example, alkali metal carbonates or bicarbonates, or alkaline earth metal carbonates or bicarbonates.
- alkali metal carbonates or bicarbonates or alkaline earth metal carbonates or bicarbonates.
- calcium carbonate, calcium hydrogen carbonate, sodium carbonate, sodium hydrogen carbonate and the like are used.
- 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 cation curable resin 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 a cationic polymerization initiator and an additive to be added as necessary.
- the sealant for organic EL display elements of the present invention has an overall viscosity lower limit of 80 mPa ⁇ s and an upper limit of 5000 mPa ⁇ s measured using an E-type viscometer at 25 ° C. and 1 to 100 rpm.
- the viscosity is less than 80 mPa ⁇ s
- the obtained sealing agent for organic EL display elements is inferior in applicability and shape stability after application, composition unevenness occurs, and the cured product becomes transparent. It becomes inferior.
- the sealing agent for organic EL display elements obtained will be inferior to applicability
- the preferable lower limit of the viscosity is 150 mPa ⁇ s
- the preferable upper limit is 3000 mPa ⁇ s
- the more preferable lower limit is 200 mPa ⁇ s
- the more preferable upper limit is 1000 mPa ⁇ s.
- the viscosity can be measured, for example, with a CP1 type cone plate using VISCOMETER TV-22 (manufactured by Toki Sangyo Co., Ltd.) as an E type viscometer.
- the viscosity when measuring using an E-type viscometer, when the viscosity is 1000 mPa ⁇ s or more and less than 5000 mPa ⁇ s, it is measured under the condition of 1 rpm, and when the viscosity is 500 mPa ⁇ s or more and less than 1000 mPa ⁇ s, it is 5 rpm. When the viscosity is 200 mPa ⁇ s or more and less than 500 mPa ⁇ s, the measurement is performed under the condition of 10 rpm.
- the measurement is performed under the condition of 20 rpm, and the viscosity is 50 mPa ⁇ s. -When it becomes less than s, it is preferable to measure on the conditions of 100 rpm.
- Example 1 As the cationic curable resin, 50 parts by weight of a compound represented by the above formula (4) (manufactured by Daicel, “Celoxide 8000”) and a compound represented by the above formula (5) (manufactured by Nissan Chemical Co., Ltd., “TEPIC-VL”). ”) 50 parts by weight and 1 part by weight of an aromatic sulfonium salt (manufactured by Midori Chemical Co.,“ DTS-200 ”) as a photocationic polymerization initiator are mixed and heated to 80 ° C., and then stirred and mixed (Sinky Corporation). Manufactured by “AR-250”) and uniformly mixed at a stirring speed of 3000 rpm to prepare an organic EL display element sealing agent.
- a compound represented by the above formula (4) manufactured by Daicel, “Celoxide 8000”
- a compound represented by the above formula (5) manufactured by Nissan Chemical Co., Ltd., “TEPIC-VL”.
- Examples 2 to 7, Comparative Examples 1 to 6 Each material described in Table 1 was stirred and mixed in the same manner as in Example 1 in accordance with the blending ratio described in Table 1 to prepare an organic EL display element sealant.
- the organic EL display element sealants obtained in Examples 4 to 6 and Comparative Examples 2 and 5 were cured by heating at 100 ° C. for 30 minutes without irradiation with ultraviolet rays.
- the change in weight from the application of the sealant to the occurrence of the curing reaction was confirmed using a thermogravimetric apparatus (TA-INSTRUMENTS, “TGA”).
- the organic EL display element sealants obtained in Examples 4 to 6 and Comparative Examples 2 and 5 were cured by heating at 100 ° C. for 30 minutes without irradiation with ultraviolet rays.
- the outgassing prevention property was evaluated as “ ⁇ ” when the vaporized component amount was less than 20 ppm, “ ⁇ ” when it was 20 ppm or more and less than 100 ppm, and “X” when it was 100 ppm or more.
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Abstract
Description
以下に本発明を詳述する。
そこで本発明者らは、硬化性樹脂として、エポキシ基又はオキセタニル基を有し、かつ、エポキシ基又はオキセタニル基に含まれる以外のエーテル結合、及び、エステル結合を有さない特定のカチオン硬化性樹脂を用いることにより、アウトガスの発生を抑制することができ、かつ、塗布性に優れる有機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。
上記カチオン硬化性樹脂は、エポキシ基又はオキセタニル基を有し、かつ、エポキシ基又はオキセタニル基に含まれる以外のエーテル結合、及び、エステル結合を有さないもの(以下、「本発明にかかるカチオン硬化性樹脂」ともいう)である。
上記その他のカチオン硬化性樹脂としては、ビスフェノール骨格を有するエポキシ樹脂、ノボラック骨格を有するエポキシ樹脂、ナフタレン骨格を有するエポキシ樹脂、及び、ジシクロペンタジエン骨格を有するエポキシ樹脂からなる群より選択される少なくとも1種のエポキシ樹脂が好ましく、ビスフェノール骨格を有するエポキシ樹脂がより好ましく、ビスフェノールF型エポキシ樹脂が更に好ましい。
上記カチオン重合開始剤としては、光照射によりプロトン酸又はルイス酸を発生する光カチオン重合開始剤や、加熱によりプロトン酸又はルイス酸を発生する熱カチオン重合開始剤が挙げられる。これらであれば特に限定されず、イオン性酸発生型であってもよいし、非イオン性酸発生型であってもよい。
上記ホスホニウム塩としては、エチルトリフェニルホスホニウム六フッ化アンチモン、テトラブチルホスホニウム六フッ化アンチモン等が挙げられる。
上記第4級アンモニウム塩としては、例えば、ジメチルフェニル(4-メトキシベンジル)アンモニウムヘキサフルオロホスフェート、ジメチルフェニル(4-メトキシベンジル)アンモニウムヘキサフルオロアンチモネート、ジメチルフェニル(4-メトキシベンジル)アンモニウムテトラキス(ペンタフルオロフェニル)ボレート、ジメチルフェニル(4-メチルベンジル)アンモニウムヘキサフルオロヘキサフルオロホスフェート、ジメチルフェニル(4-メチルベンジル)アンモニウムヘキサフルオロアンチモネート、ジメチルフェニル(4-メチルベンジル)アンモニウムヘキサフルオロテトラキス(ペンタフルオロフェニル)ボレート、メチルフェニルジベンジルアンモニウム、メチルフェニルジベンジルアンモニウムヘキサフルオロアンチモネートヘキサフルオロホスフェート、メチルフェニルジベンジルアンモニウムトラキス(ペンタフルオロフェニル)ボレート、フェニルトリベンジルアンモニウムテトラキス(ペンタフルオロフェニル)ボレート、ジメチルフェニル(3,4-ジメチルベンジル)アンモニウムテトラキス(ペンタフルオロフェニル)ボレート、N,N-ジメチル-N-ベンジルアニリニウム六フッ化アンチモン、N,N-ジエチル-N-ベンジルアニリニウム四フッ化ホウ素、N,N-ジメチル-N-ベンジルピリジニウム六フッ化アンチモン、N,N-ジエチル-N-ベンジルピリジニウムトリフルオロメタンスルホン酸等が挙げられる。
上記ヒドラジド化合物としては、例えば、1,3-ビス[ヒドラジノカルボノエチル-5-イソプロピルヒダントイン]等が挙げられる。
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ービス(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種類以上が併用されてもよい。
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(ビックケミー・ジャパン社製)、BYK-340(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型のコーンプレートにて測定することができる。
また、E型粘度計を用いて測定する際、粘度が1000mPa・s以上5000mPa・s未満となる場合は1rpmの条件で測定し、粘度が500mPa・s以上1000mPa・s未満となる場合は5rpmの条件で測定し、粘度が200mPa・s以上500mPa・s未満となる場合は10rpmの条件で測定し、粘度が50mPa・s以上200mPa・s未満となる場合は20rpmの条件で測定し、粘度が50mPa・s未満となる場合は100rpmの条件で測定することが好ましい。
カチオン硬化性樹脂として、上記式(4)で表される化合物(ダイセル社製、「セロキサイド8000」)50重量部及び上記式(5)で表される化合物(日産化学社製、「TEPIC-VL」)50重量部と、光カチオン重合開始剤として芳香族スルホニウム塩(みどり化学社製、「DTS-200」)1重量部とを混合し、80℃に加熱した後、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に記載された各材料を、表1に記載された配合比に従い、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1~7及び比較例1~6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に示した。
実施例1~7及び比較例1~6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」コーンプレート:CP1型)を用いて、25℃、1~100rpmの条件における粘度を測定した。
ディスペンサー(武蔵エンジニアリング社製、「SHOTMASTER300」)を用い、ディスペンスノズルを400μm、ノズルギャップを30μm、塗出圧を300kPaに固定し、ガラス基板上に実施例1~7及び比較例1~6で得られた各有機EL表示素子用封止剤を塗布した。塗布後、紫外線照射装置(オーク社製、「JL-4300-3S」)を用いて紫外線を1500mJ/cm2照射し、その後100℃で15分間加熱を行うことで樹脂を硬化させた。なお、実施例4~6、比較例2、5で得られた有機EL表示素子用封止剤については、紫外線の照射を行わずに100℃で30分間加熱硬化させた。封止剤を塗布してから硬化反応が起こるまでの重量変化を熱重量測定装置(TA-INSTRUMENTS社製、「TGA」)を用いて確認した。
かすれやダレがなく塗布でき、かつ、硬化反応が起こるまでに重量減少がほとんど起こらなかった場合を「○」、塗布状態がかすれやダレが生じた場合や、硬化反応が起こるまでに5%未満の重量減少が起こった場合を「△」、塗布状態が大きな塗布切れや塗布ムラが生じたり、全く塗布できなかったりした場合や、硬化反応起こるまでに5%以上の重量減少が起こった場合を「×」として塗布性及び塗布形状安定性を評価した。
実施例1~7及び比較例1~6で得られた各有機EL表示素子用封止剤を、バイアル瓶中に300mg計量して封入した後、紫外線照射装置(オーク社製、「JL-4300-3S」)を用いて紫外線を1500mJ/cm2照射し、その後100℃で15分間加熱を行うことで樹脂を硬化させた。更にこのバイアル瓶を85℃の恒温オーブンで100時間加熱し、バイアル瓶中の気化成分を、ガスクロマトグラフ質量分析計(日本電子社製、「JMS-k9」)を用いて測定した。なお、実施例4~6、比較例2、5で得られた有機EL表示素子用封止剤については、紫外線の照射を行わずに100℃で30分間加熱硬化させた。
その結果、気化成分量が20ppm未満であった場合を「○」、20ppm以上100ppm未満であった場合を「△」、100ppm以上であった場合を「×」としてアウトガス防止性を評価した。
Claims (5)
- カチオン硬化性樹脂と、カチオン重合開始剤とを含有する有機EL表示素子用封止剤であって、
前記カチオン硬化性樹脂は、エポキシ基又はオキセタニル基を有し、かつ、エポキシ基又はオキセタニル基に含まれる以外のエーテル結合、及び、エステル結合を有さないものであり、
E型粘度計を用いて、25℃、1~100rpmの条件で測定した有機EL表示素子用封止剤全体の粘度が80~5000mPa・sである
ことを特徴とする有機EL表示素子用封止剤。 - カチオン硬化性樹脂は、下記式(1)で表される化合物及び/又は下記式(2)で表される化合物を含有することを特徴とする請求項1記載の有機EL表示素子用封止剤。
式(1)中、R1~R18は、水素原子、ハロゲン原子、又は、酸素原子若しくはハロゲン原子を含んでいてもよい炭化水素基であり、それぞれ同一であってもよいし、異なっていてもよい。
式(2)中、R19~R21は、直鎖状又は分岐鎖状の炭素数2~10のアルキレン基であり、それぞれ同一であってもよいし、異なっていてもよい。E1~E3は、それぞれ独立して下記式(3-1)又は下記式(3-2)で表される有機基を表す。
式(3-1)中、R22は、水素原子又はメチル基である。 - カチオン硬化性樹脂は、式(1)で表される化合物及び式(2)で表される化合物を含有することを特徴とする請求項2記載の有機EL表示素子用封止剤。
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| TW201527404A (zh) | 2015-07-16 |
| TWI614301B (zh) | 2018-02-11 |
| CN105308092B (zh) | 2018-01-30 |
| CN105308092A (zh) | 2016-02-03 |
| KR102226349B1 (ko) | 2021-03-10 |
| KR20160079728A (ko) | 2016-07-06 |
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