JP2016051602A - Sealing agent for organic electroluminescent display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing agent for an organic electroluminescent display element, excellent in low-temperature curability, storage stability and flatness of a cured film.SOLUTION: A sealing agent for an organic electroluminescent display element contains: a cationically polymerizable compound containing an epoxy compound having a hydrogenated bisphenol skeleton; and a heat cationic polymerization initiator having a cation part represented by the following formula (1). The content of the heat cationic polymerization initiator having a cation part represented by the formula (1) is less than 0.1 pt.wt. with respect to 100 pts.wt. of the cationically polymerizable compound. In the formula (1), R, Rand Reach independently represent a 1-6C alkyl group.SELECTED DRAWING: None

Description

The present invention relates to an encapsulant for organic electroluminescence display elements that is excellent in low-temperature curability, storage stability, and flatness of a cured film.

An 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 electrons are transmitted from one electrode to the organic light emitting material layer. By being injected and holes are injected from the other electrode, electrons and holes are combined in the organic light emitting material layer to emit light. Thus, since 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.

Patent Document 1 discloses a method of sealing an organic light emitting material layer and an electrode of an organic EL display element with a laminated film of a resin film formed by a CVD method and a silicon nitride film. Here, the resin film has a role of preventing pressure on the organic layer and the electrode due to internal stress of the silicon nitride film.

In the method of sealing with a silicon nitride film disclosed in Patent Document 1, the organic thin film element is formed when the silicon nitride film is formed due to unevenness on the surface of the organic thin film element, adhesion of foreign matters, generation of cracks due to internal stress, or the like. May not be completely covered. If the coating with the silicon nitride film is incomplete, moisture will enter the organic layer through the silicon nitride film.
As a method for preventing moisture from entering the organic layer, Patent Document 2 discloses a method of alternately depositing an inorganic material film and a resin film, and Patent Document 3 and Patent Document 4 disclose. A method of forming a resin film on an inorganic material film is disclosed.

As a method of forming a resin film on an inorganic material film, Patent Document 5 discloses a method of applying a resin composition on an inorganic material film. However, particularly when a resin film having a thickness of 20 μm or less is formed, pinholes are likely to occur in the coating film, and the obtained resin film cannot sufficiently prevent moisture from entering the organic light emitting material layer. there were.

JP 2000-223264 A JP 2005-522891 A JP 2001-307873 A JP 2008-149710 A JP 2012-190612 A

An object of this invention is to provide the sealing agent for organic electroluminescent display elements which is excellent in low temperature curability, storage stability, and the flatness of a cured film.

The present invention comprises a cationically polymerizable compound containing an epoxy compound having a hydrogenated bisphenol skeleton, and a thermal cationic polymerization initiator having a cation moiety represented by the following formula (1). The sealing agent for organic electroluminescent display elements whose content of the thermal cationic polymerization initiator which has a cation part represented is less than 0.1 weight part with respect to 100 weight part of said cation polymeric compounds.

In formula (1), R ¹ , R ² , and R ³ are each independently an alkyl group having 1 to 6 carbon atoms.
The present invention is described in detail below.

The inventors of the present invention provide a curable resin composition containing an acrylic compound and a radical polymerization initiator that have been used conventionally for the purpose of sufficiently preventing moisture from entering the inside of the organic EL display element. Instead, the use of a curable resin composition containing a cationic polymerizable compound such as an epoxy compound or an oxetanyl compound and a thermal cationic polymerization initiator or a thermosetting agent as an encapsulant for an organic EL display element was studied. However, such a curable resin composition cannot achieve both low-temperature curability and storage stability required from the viewpoint of element damage or the like, or a coating film that has been undulated during coating is cured as it is. There is a problem that moisture permeation preventive properties cannot be sufficiently obtained due to inferior flatness. In particular, when applied by a printing method such as a screen printing method, the problem of flatness was remarkable.
As a result of further intensive studies, the present inventors have surprisingly found that by using a specific cationic polymerizable compound in combination with a specific thermal cationic polymerization initiator, low-temperature curability, storage stability, and curing can be achieved. The present inventors have found that a sealing agent for organic EL display elements excellent in all the flatness of the film can be obtained, and have completed the present invention. The sealing agent for organic EL display elements of the present invention can form a cured film having excellent flatness even when applied on a substrate or an inorganic material film by a printing method such as a screen printing method.

The sealing agent for organic EL display elements of this invention contains a cationically polymerizable compound.
The cationic polymerizable compound contains an epoxy compound having a hydrogenated bisphenol skeleton.
By including the epoxy compound having the hydrogenated bisphenol skeleton, the sealing agent for organic EL display elements of the present invention is excellent in low-temperature curability. Moreover, since the compounding quantity of the thermosetting agent mentioned later can be made into a small quantity, the cured film excellent in the flatness which reduced the wave | undulation can be obtained.

The preferable lower limit of the epoxy equivalent of the epoxy compound having a hydrogenated bisphenol skeleton is 150 g / eq, and the preferable upper limit is 1200 g / eq. When the epoxy equivalent is in the above range, the obtained sealing agent for organic EL display elements has excellent adhesion to the substrate and the inorganic material film. The more preferable lower limit of the epoxy equivalent is 160 g / eq, and the more preferable upper limit is 1000 g / eq.
The above “epoxy equivalent” means (molecular weight of epoxy compound) / (number of epoxy groups in one molecule of epoxy compound).

Examples of the epoxy compound having a hydrogenated bisphenol skeleton include a hydrogenated bisphenol A type epoxy compound, a hydrogenated bisphenol F type epoxy compound, a hydrogenated bisphenol E type epoxy compound, and a hydrogenated bisphenol S type epoxy compound. Of these, at least one selected from the group consisting of hydrogenated bisphenol A type epoxy compounds, hydrogenated bisphenol F type epoxy compounds, and hydrogenated bisphenol E type epoxy compounds is preferred. These epoxy compounds having a hydrogenated bisphenol skeleton may be used alone or in combination of two or more.

Examples of the hydrogenated bisphenol A type epoxy compound include a compound represented by the following formula (2), and examples of the hydrogenated bisphenol F type epoxy compound include a compound represented by the following formula (3). Examples of the hydrogenated bisphenol E type epoxy compound include compounds represented by the following formula (4).

In formula (2), l represents an integer of 0 to 100.

In formula (3), m represents an integer of 0 to 100.

In formula (4), n represents an integer of 0 to 100.

The epoxy compound having a hydrogenated bisphenol skeleton can be produced by hydrogenating the epoxy compound having a corresponding bisphenol skeleton by a known method. As a method for producing the epoxy compound having the hydrogenated bisphenol skeleton, specifically, for example, the epoxy compound having the bisphenol skeleton is dissolved in a solvent-free or suitable organic solvent, and rhodium or ruthenium is activated carbon or Examples thereof include a method in which an aromatic ring of an epoxy compound having a bisphenol skeleton is selectively hydrogenated in the presence of a catalyst supported on graphite.

Examples of commercially available hydrogenated bisphenol A type epoxy compounds include YX-8000 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent 205 g / eq), YX-8034 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent 290 g / eq). ), YX-8040 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent 1200 g / eq) and the like.
Examples of commercially available hydrogenated bisphenol F-type epoxy compounds include jER1750 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent 170 g / eq), YL-6753 (manufactured by Mitsubishi Chemical Corporation, epoxy equivalent 180 g / eq), and the like. Is mentioned.

The cationically polymerizable compound may contain other cationically polymerizable compounds other than the compound having the hydrogenated bisphenol skeleton as long as the object of the present invention is not impaired.
Examples of the other cationic polymerizable compounds include epoxy compounds having a bisphenol skeleton such as bisphenol A type epoxy compounds and bisphenol F type epoxy compounds, and oxetane resins.

When the other cationic polymerizable compound is contained, the preferred lower limit of the content of the compound having a hydrogenated bisphenol skeleton is 30 parts by weight with respect to 100 parts by weight of the whole cationic polymerizable compound. When the content of the compound having a hydrogenated bisphenol skeleton is less than 30 parts by weight, the obtained sealing agent for organic EL display elements may be inferior in low-temperature curability and flatness of a cured film. The minimum with more preferable content of the compound which has the said hydrogenated bisphenol skeleton is 50 weight part.

The sealing agent for organic EL display elements of this invention contains the thermal cationic polymerization initiator (henceforth "the thermal cationic polymerization initiator concerning this invention") which has a cation part represented by the said Formula (1). To do. By including the thermal cationic polymerization initiator according to the present invention in combination with the compound having the hydrogenated bisphenol skeleton, the sealing agent for organic EL display elements of the present invention is excellent in low temperature curability and storage stability. Become. Moreover, the flatness of a cured film will be excellent by making content of the thermal cationic polymerization initiator concerning this invention into a small quantity.

The thermal cationic polymerization initiator according to the present invention has a cation moiety represented by the above formula (1). Especially, what has a cation part represented by following formula (5) is used suitably.

Examples of the anion portion (counter anion) of the thermal cationic polymerization initiator according to the present invention include AsF ₆ ⁻ , SbF ₆ ⁻ , PF ₆ ⁻ , ions represented by the following formula (6), and the like. Especially, it is preferable that the thermal cationic polymerization initiator concerning this invention has an anion part represented by following formula (6).

As what is marketed among the thermal cationic polymerization initiators concerning this invention, CXC-1612 (made by King Industries) etc. are mentioned, for example.
These thermal cationic polymerization initiators may be used alone or in combination of two or more.

The content of the thermal cationic polymerization initiator according to the present invention is less than 0.1 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound. When the content of the cationic polymerization initiator according to the present invention is 0.1 parts by weight or more, the undulation after coating cannot be reduced and the cured film is inferior in flatness. The upper limit with preferable content of the cationic polymerization initiator concerning this invention is 0.09 weight part, and a more preferable upper limit is 0.08 weight part.
In addition, the content of the thermal cationic polymerization initiator according to the present invention is preferably 0.03 parts by weight with respect to 100 parts by weight of the cationic polymerizable compound according to the present invention. When the content of the thermal cationic polymerization initiator according to the present invention is less than 0.03 parts by weight, the obtained sealing agent for organic EL display elements may be inferior in curability. The minimum with more preferable content of the cationic polymerization initiator concerning this invention is 0.04 weight part.

In addition to the thermal cationic polymerization initiator concerning this invention, the sealing agent for organic EL display elements of this invention is compatible with low-temperature curability and storage stability, and improves the flatness of a cured film. In addition, other thermal cationic polymerization initiators may be contained.

The sealing agent for organic EL display elements of the present invention may contain a surface modifier. By containing the surface modifier, the flatness after application of the organic EL display element sealing agent of the present invention can be further improved.
Examples of the surface modifier include surfactants and leveling agents.

Examples of the surface modifier include silicone-based, acrylic-based, and fluorine-based ones. Of these, silicone-based ones are preferable, polyether-modified polydimethylsiloxane and polyester-modified polydimethylsiloxane are more preferable, and polyether-modified polydimethylsiloxane is more preferable.
Examples of commercially available surface modifiers include BYK-354, BYK-300, BYK-302, BYK-306, BYK-307, BYK-310, BYK-313, BYK-315, and BYK. -320, BYK-322, BYK-323, BYK-325, BYK-330, BYK-331, BYK-333, BYK-342, BYK-345, BYK-346, BYK-347, BYK-348, BYK-349 , BYK-370, BYK-378, BYK-3455 (all manufactured by Big Chemie Japan), Surflon S-611 (manufactured by AGC Seimi Chemical), and the like.

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 | substrate, etc.

Examples of the silane coupling agent include 3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-isocyanatopropyltrimethoxysilane. 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. When 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. When 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 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. Specifically, for example, calcium carbonate, calcium hydrogen carbonate, sodium carbonate, sodium hydrogen carbonate and the like are used.

As the ion exchange resin, any of a cation exchange type, an anion exchange type, and a both ion exchange type can be used. Is preferred.

Moreover, 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 the thermal cationic polymerization initiator according to the present invention and an additive added as necessary.

The sealing agent for organic EL display elements of the present invention preferably has a surface tension at 25 ° C. of 25 mN / m or less. When the surface tension is 25 mN / m or less, the coating film has excellent flatness. The surface tension is more preferably 23 mN / m or less.
In the present specification, the surface tension can be measured with a dynamic wettability tester (manufactured by Reska Co., Ltd., “WET-6100 type”).

The sealing agent for organic EL display elements of the present invention can be suitably applied by a screen printing method.
Moreover, as another method of apply | coating the sealing agent for organic EL display elements of this invention, an electrostatic coating method, a slit coat method, a dispenser coating method, a flexographic printing method, a gravure printing method etc. are mentioned, for example.
Moreover, the sealing agent for organic EL display elements of this invention may be apply | coated to the whole surface of a board | substrate or an inorganic material film, and may be applied to a part of a board | substrate or an inorganic material film.

The sealing agent for organic EL display elements of the present invention has a preferable lower limit of 100 mPa · s and a preferable upper limit of 6000 mPa · s of the total viscosity measured at 25 ° C. and 2.5 rpm using a cone rotor viscometer. It is. When the said viscosity is less than 100 mPa * s or exceeds 6000 mPa * s, the obtained sealing agent for organic EL display elements may become inferior to applicability | paintability. The more preferable lower limit of the viscosity is 1000 mPa · s, and the more preferable upper limit is 5000 mPa · s.

The shape of the sealing portion formed by 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, and the laminate is not limited. 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. However, it can be suitably used when the laminate is completely covered.

ADVANTAGE OF THE INVENTION According to this invention, the sealing agent for organic electroluminescent display elements which is excellent in low temperature curability, storage stability, and the flatness of a cured film can be provided.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Synthesis example)
In a 1000 mL autoclave equipped with a stirrer, a cooler and a thermometer, 100 g of bisphenol E type epoxy resin (manufactured by Printec, “EPOX-MK R710”, epoxy equivalent 163 g / eq), 300 g of tetrahydrofuran, and 5 % Rhodium / 95% graphite (surface area of graphite: 130 m ² / g) A catalyst was charged with 5.0 g, and the reduction reaction was performed for 5 hours while maintaining the conditions of a hydrogen pressure of 7 MPa, a temperature of 70 to 100 ° C., and a stirring speed of 500 to 800 rpm. went. After completion of the reaction, the reaction mixture was cooled and the catalyst was filtered off. Tetrahydrofuran was distilled off at a temperature of 80 to 120 ° C. under reduced pressure using a rotary evaporator to obtain a hydrogenated bisphenol E type epoxy compound. The epoxy equivalent of the obtained hydrogenated bisphenol E type epoxy compound was 169 g / eq.

(Example 1)
As a compound having a hydrogenated bisphenol skeleton, 60 parts by weight of a hydrogenated bisphenol A type epoxy compound (manufactured by Mitsubishi Chemical Corporation, “YX-8000”) and a hydrogenated bisphenol A type epoxy compound (manufactured by Mitsubishi Chemical Corporation, “YX-8034”) 40 parts by weight, 0.09 part by weight of a compound represented by the following formula (7) as a thermal cationic polymerization initiator according to the present invention (manufactured by King Industries), and a polyether-modified polydimethylsiloxane solution as a surface modifier (BYK-330, manufactured by Big Chemie Japan Co., Ltd.) is mixed with 0.3 part by weight, and uniform using a planetary stirrer (manufactured by Sinky, “Netaro Awatori AR-100”) at a stirring speed of 2000 rpm. The mixture was stirred and mixed to prepare an organic EL display element sealant.

(Examples 2 to 10, Comparative Examples 1 to 7)
A sealant for an organic EL display element was produced in the same manner as in Example 1 except that the materials and blending amounts used were those shown in Tables 1 and 2.
In Tables 1 and 2, “CXC-1612” is a compound represented by the following formula (8), which is a thermal cationic polymerization initiator according to the present invention.

<Evaluation>
The following evaluation was performed about each sealing agent for organic EL display elements obtained by the Example and the comparative example. The results are shown in Tables 1 and 2.

(1) Viscosity and storage stability About each sealing agent for organic EL display elements obtained in Examples and Comparative Examples, a cone rotor viscometer (manufactured by Toki Sangyo Co., Ltd., “TV-22 type”) was used. The viscosity (initial viscosity) at 25 ° C. and 2.5 rpm was measured.
Moreover, the viscosity when each sealing agent for organic EL display elements obtained in Examples and Comparative Examples was stored at 25 ° C. for 1 week was measured in the same manner as the initial viscosity, and ((after storage at 25 ° C. for 1 week) Of viscosity) − (initial viscosity)) / (initial viscosity) was measured as the rate of change in viscosity. Storage stability when viscosity change rate is less than 1.05, “◯”, when 1.05 or more and less than 1.1, “△”, and when 1.1 or more, “×” Evaluated.

(2) Flatness of cured film Each sealant for an organic EL display element obtained in Examples and Comparative Examples was made of glass using a screen printing machine (manufactured by Neurong Seimitsu Kogyo Co., Ltd., “LS-100VC”). The substrate was applied by screen printing. At the time of application, the printing speed and the like were adjusted so that the film thickness was 20 μm or less. Subsequently, it heated for 30 minutes in 100 degreeC oven, the sealing agent for organic EL display elements was hardened, and the cured film was obtained. When the obtained cured film is visually observed, the cured film is indicated as “◯” when there is no unevenness, “△” when there is slight unevenness, and “×” when there are large or many unevenness and repelling. The flatness of was evaluated.

(3) Low temperature curability About each sealing agent for organic EL display elements obtained in Examples and Comparative Examples, the reaction rate of epoxy groups (peaks derived from epoxy groups) when cured by heating at 100 ° C. for 30 minutes. (Reduction rate) was measured using an infrared spectrometer (“UMA600”, manufactured by Agilent Technologies), “◎” when the reaction rate was 90% or more, and less than 90% and 80% or more. The evaluation of low-temperature curability was evaluated with “O” and “X” being less than 80%.

(4) Reliability of organic EL display element (production of a substrate on which a laminate having an organic light emitting material layer is disposed)
A glass substrate with an ITO electrode formed in 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 each, then washed with boiled isopropyl alcohol for 10 minutes, and further UV-ozone cleaner (manufactured by Nippon Laser Electronics Co., Ltd., The last treatment was performed with “NL-UV253”).
Next, 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 (α-NPD) is put into an unglazed crucible in other different ways. 200 mg of tris (8-hydroxyquinola) aluminum (Alq ₃ ) was put in an unglazed crucible, and the pressure in the vacuum chamber was reduced to 1 × 10 ⁻⁴ Pa. Thereafter, the crucible containing α-NPD was heated and α-NPD was deposited on the substrate at a deposition rate of 15 Å / s to form a 600 正 孔 hole transport layer. Next, the crucible containing Alq ₃ was heated to form an organic light emitting material layer having a thickness of 600 で at a deposition rate of 15 Å / 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. Then, after reducing the pressure in the vapor deposition unit of the vacuum vapor deposition apparatus to 2 × 10 ⁻⁴ Pa and depositing 5 μm of lithium fluoride at a deposition rate of 0.2 kg / s, deposit 1000 μm of aluminum 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 was arranged was taken out.

(Coating with inorganic material film A)
A mask having an opening 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.
In the plasma CVD method, SiH ₄ gas and nitrogen gas are used as source gases, the flow rates thereof are SiH ₄ gas 10 sccm and nitrogen gas 200 sccm, RF power is 10 W (frequency 2.45 GHz), chamber temperature is 100 ° C., chamber temperature 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 μm.

(Formation of resin protective film)
The glass coated with the inorganic material film A by using a screen printer (“LS-100VC”, manufactured by Neurong Seimitsu Kogyo Co., Ltd.) with each of the sealants for organic EL display elements obtained in Examples and Comparative Examples. The substrate was applied by screen printing. At the time of application, the printing speed and the like were adjusted so that the film thickness was 20 μm or less. Subsequently, it heated in 100 degreeC oven for 30 minutes, the sealing agent for organic EL display elements was hardened, and the resin protective film was formed.

(Coating with inorganic material film B)
After forming the resin protective film, a mask having an opening was placed so as to cover the entire resin protective film, and an inorganic material film B was formed by a plasma CVD method to obtain an organic EL display element.
In the 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 B had a thickness of about 1 μm.

(Light emission state of organic EL display element)
The obtained organic EL display element (2 inch cell) was exposed for 100 hours in an environment of temperature 85 ° C. and humidity 85%, and then a voltage of 10 V was applied to visually check the light emission state (the presence or absence of light emission and dark spots) of the element. Observed at. Evaluation was made with “◯” when there was no dark spot and light was emitted uniformly, “Δ” when light was emitted but there was a dark spot, and “X” when no light was emitted.

ADVANTAGE OF THE INVENTION According to this invention, the sealing agent for organic electroluminescent display elements which is excellent in low temperature curability, storage stability, and the flatness of a cured film can be provided.

Claims (2)

A cationically polymerizable compound containing an epoxy compound having a hydrogenated bisphenol skeleton, and a thermal cationic polymerization initiator having a cation moiety represented by the following formula (1):
The content of the thermal cationic polymerization initiator having a cation part represented by the formula (1) is less than 0.1 parts by weight with respect to 100 parts by weight of the cation polymerizable compound. Sealant for luminescence display element.

In formula (1), R ¹ , R ² , and R ³ are each independently an alkyl group having 1 to 6 carbon atoms. The thermal cationic polymerization initiator having a cation moiety represented by the formula (1) has an anion moiety represented by the following formula (6), and is sealed for an organic electroluminescence display element according to claim 1. Agent.