Sealing agent, cured body, display device, method for manufacturing display device, solar cell, and composition

Abstract

A sealing agent containing a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X), the sealing agent being characterized in that, in a viscosity measurement performed under the following measurement condition (1), the viscosity 20 seconds after the start of the measurement is set as V0, and the viscosity 30 seconds after the start of the measurement is set as V0, the viscosity 20 seconds after the start of the measurement is set as V0, and the viscosity 20 seconds after the start of the measurement is set as V0. The alkali-free glass plate is irradiated with ultraviolet light having a wavelength of 365 nm and 30 mW / cm2 vertically from a location 15 cm from the alkali-free glass plate for 20 seconds (600 mJ / cm2 in total), and the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75, where V1 is the viscosity 60 seconds after the completion of the ultraviolet light irradiation.

Description

Technical Field

[0001] The present invention relates to a sealant, a cured body, a display device, a method for manufacturing a display device, a solar cell, and a composition. Background Art

[0002] In recent years, research on organic optoelectronic devices using organic thin film elements such as organic electroluminescent (organic EL) display elements and organic thin film solar cell elements has been promoted. Since organic thin film elements can be easily fabricated by vacuum evaporation, solution coating, etc., their productivity is excellent.

[0003] An organic electroluminescent display element has a thin film structure in which an organic light-emitting material layer is sandwiched between a pair of opposed electrodes. By injecting electrons from one electrode into the organic light-emitting material layer and injecting holes from the other electrode into the organic light-emitting material layer, electrons and holes combine in the organic light-emitting material layer to generate self-luminescence. Organic electroluminescent display elements have the following advantages: compared with liquid crystal display elements that require a backlight, etc., they have better visibility, can be made thinner, and can achieve direct current low voltage driving.

[0004] However, with respect to such organic electroluminescent display elements, if the organic light-emitting material layer or the electrodes are exposed to external gases, there are problems that their light-emitting characteristics deteriorate rapidly and their lifespan becomes short. Therefore, in order to improve the stability and durability of organic electroluminescent display elements, a sealing technique for blocking moisture or oxygen in the atmosphere from entering the organic light-emitting material layer or the electrodes has become indispensable in organic electroluminescent display elements.

[0005] As a technique for such a sealant for organic electroluminescent elements, for example, the techniques described in Patent Document 1 (International Publication No. 2020 / 171186) and Patent Document 2 (International Publication No. 2020 / 067046) can be cited.

[0006] Patent Document 1 describes a composition containing (A) a cationically polymerizable compound, (B) a photo cationic polymerization initiator, and (C) at least one phosphoric acid compound selected from the group consisting of phosphoric acid esters and phosphorous acid esters. The (A) cationically polymerizable compound contains (A-1) an alicyclic compound having an epoxy group and (A-2) an aromatic compound having an epoxy group. The (A-2) aromatic compound having an epoxy group contains (A-2-1) bisphenol A type epoxy resin and (A-2-2) bisphenol F type epoxy resin. The ratio A1 / A2 (mass ratio) of the content A1 of the (A-2-1) bisphenol A type epoxy resin to the content A2 of the (A-2-2) bisphenol F type epoxy resin is 0.2 to 5. This composition has less increase in viscosity after light irradiation and can be suitably used as a sealant for organic electroluminescent elements, and is less likely to cause deterioration of organic electroluminescent elements.

[0007] Patent Document 2 describes a sealant for an organic electroluminescent display element, which contains: a cationically polymerizable compound containing an alicyclic compound having an epoxy group and an aromatic compound having an epoxy group; a photo cationic polymerization initiator; and two or more curing retarders selected from the group consisting of a phosphoric acid-based curing retarder, an ether-based curing retarder, a metal complex-based curing retarder, and a nitroxide radical-based curing retarder; the phosphoric acid-based curing retarder is selected from the group consisting of phosphates and phosphites. This sealant for an organic electroluminescent display element has a sufficiently long service life after light irradiation, has a moderately increased viscosity after light irradiation and is easy to bond, and has excellent reliability after curing.

[0008] Prior Art Documents

[0009] Patent Documents

[0010] Patent Document 1: International Publication No. 2020 / 171186

[0011] Patent Document 2: International Publication No. 2020 / 067046 Summary of the Invention

[0012] Technical Problem to be Solved by the Invention

[0013] As a sealant, it is preferably less likely to cause coating unevenness on an uneven substrate such as a color filter or a substrate with a light-emitting diode element (TFT substrate).

[0014] In view of the above circumstances, the present invention has been completed, and it provides a sealant and a composition with improved coatability on an uneven substrate, a display device using the sealant, and a solar cell using the sealant.

[0015] Means for Solving the Technical Problem

[0016] The inventors of the present invention have continuously and intensively studied in order to achieve the above problems. As a result, it has been found that by making the viscosity change rate before and after ultraviolet irradiation within a specific range, the coatability on an uneven substrate can be improved, and thus the present invention has been completed.

[0017] According to the present invention, there are provided a sealant, a cured product, a display device, a method for manufacturing a display device, a solar cell, and a composition as described below. [1]

[0019] A sealant, which contains a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X), wherein,

[0020] In the viscosity measurement conducted under the following Measurement Condition 1, the viscosity 20 seconds after the start of the measurement is designated as V0. 30 seconds after the start of the measurement, ultraviolet rays with a wavelength of 365 nm and an intensity of 30 mW / cm 2 are perpendicularly irradiated from a point 15 cm away from the non-alkali glass plate towards the non-alkali glass plate for 20 seconds (a total of 600 mJ / cm 2 ). When the viscosity 60 seconds after the end of the ultraviolet ray irradiation is designated as V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75.

[0021] <Measurement Condition 1>

[0022] Apparatus: Rheometer

[0023] Temperature: 25°C

[0024] Geometry (upper side): Aluminum parallel plate with a diameter of 8 mmφ

[0025] Plate (lower side): Non-alkali glass plate with a diameter of 38 mmφ

[0026] Shear rate: 1 min -1

[0027] Spacing: 0.05 mm

[0028] Sample amount: 20 mg

[0029] Atmosphere: Nitrogen gas flow. [2]

[0031] For the sealant according to [1] above, wherein,

[0032] the viscosity V0 is 1 mPa·s or more and 1000 mPa·s or less. [3]

[0034] For the sealant according to [1] or [2] above, wherein,

[0035] the viscosity V1 is 1 mPa·s or more and 2000 mPa·s or less. [4]

[0037] For the sealant according to any one of [1] to [3] above, wherein,

[0038] the cationically polymerizable compound (A) contains an epoxy group. [5]

[0040] For the sealant according to any one of [1] to [4] above, wherein,

[0041] The cationic polymerizable compound (A) contains one or more selected from the group consisting of an alicyclic compound (A-1) having an epoxy group, an aromatic compound (A-2) having an epoxy group, and a glycidyl ether compound (A-3). [6]

[0043] The sealant according to any one of [1] to [5] above, wherein

[0044] The cationic polymerizable compound (A) contains a bromine atom. [7]

[0046] The sealant according to any one of [1] to [6] above, wherein

[0047] In the viscosity measurement carried out under the measurement condition 1, the viscosity V2 10 minutes after the end of the ultraviolet irradiation is 5000 mPa·s or less. [8]

[0049] The sealant according to any one of [1] to [7] above, wherein

[0050] The liquid specific gravity in an atmosphere of 25°C is 1.10 or more. [9]

[0052] The sealant according to any one of [1] to [8] above, wherein

[0053] The static surface tension obtained by the sessile drop method is 50 mN / m or less.

[10]

[0055] The sealant according to any one of [1] to [9] above, wherein

[0056] The cationic polymerization initiator (B) contains one or more selected from the group consisting of a photo cationic polymerization initiator (B1) and a thermal cationic polymerization initiator (B2).

[11]

[0058] The sealant according to any one of [1] to

[10] above, wherein

[0059] The cationic polymerization initiator (B) contains an onium salt compound.

[12]

[0061] The sealant according to any one of [1] to

[11] above, wherein

[0062] The content of the cationic polymerization initiator (B) is 0.01 part by mass or more and 5.0 parts by mass or less with respect to 100 parts by mass of the cationic polymerizable compound (A).

[13]

[0064] The sealant according to any one of [1] to

[12] , wherein,

[0065] The curing retarder (X) contains one or more selected from the group consisting of a phosphoric acid-based curing retarder, an ether-based curing retarder, a thioether-based curing retarder, a metal complex-based curing retarder, and a nitroxide-based curing retarder.

[14]

[0067] The sealant according to any one of [1] to

[13] , wherein,

[0068] The content of the curing retarder (X) is 0.10 parts by mass or more and 10.0 parts by mass or less with respect to 100 parts by mass of the cationically polymerizable compound (A).

[15]

[0070] The sealant according to any one of [1] to

[14] is used for a light emitting diode element.

[16]

[0072] The sealant according to any one of [1] to

[15] is used for bonding a color filter to an organic electroluminescent display element or for bonding a color filter to a micro LED.

[17]

[0074] The sealant according to any one of [1] to

[14] can be used for sealing a solar cell unit.

[18]

[0076] The sealant according to

[17] , wherein,

[0077] The solar cell unit includes a perovskite solar cell unit.

[19]

[0079] A cured body cured from the sealant according to any one of [1] to

[18] .

[20]

[0081] A display device, comprising:

[0082] A light emitting diode element; a substrate; and a cured sealing layer formed from the cured body according to

[19] , which is located between the light emitting diode element and the substrate.

[21]

[0084] The display device according to

[20] , wherein,

[0085] The light-emitting diode element includes an organic electroluminescent display element or a micro LED.

[22]

[0087] The display device according to

[20] or

[21] , wherein

[0088] The substrate includes a color filter.

[23]

[0090] A method for manufacturing a display device, comprising:

[0091] A coating step of coating the sealant according to any one of [1] to

[16] on a first component; an irradiation step of irradiating light on the coated sealant; and a bonding step of bonding the first component and a second component via the sealant irradiated with light.

[24]

[0093] The method for manufacturing a display device according to

[23] , wherein

[0094] One of the first component and the second component is a substrate, and the other is a light-emitting diode element.

[25]

[0096] The method for manufacturing a display device according to

[24] , wherein

[0097] The light-emitting diode element includes an organic electroluminescent display element or a micro LED.

[26]

[0099] The method for manufacturing a display device according to

[24] or

[25] , wherein

[0100] The substrate includes a color filter.

[27]

[0102] A solar cell, comprising:

[0103] A solar cell unit; a substrate; and a cured sealing layer containing the cured product according to

[19] located between the solar cell unit and the substrate.

[28]

[0105] The solar cell according to

[27] , wherein

[0106] The solar cell unit includes a perovskite solar cell unit.

[29]

[0108] A composition, comprising a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X), wherein

[0109] In the viscosity measurement conducted under the following Measurement Condition 1, the viscosity 20 seconds after the start of measurement is designated as V0. 30 seconds after the start of measurement, ultraviolet rays with a wavelength of 365 nm and a power of 30 mW / cm 2 are perpendicularly irradiated onto the alkali-free glass plate from a point 15 cm away from the alkali-free glass plate for 20 seconds (a total of 600 mJ / cm 2 ). When the viscosity 60 seconds after the end of the ultraviolet ray irradiation is designated as V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75.

[0110] <Measurement Condition 1>

[0111] Apparatus: Rheometer

[0112] Temperature: 25°C

[0113] Geometry (upper side): Aluminum parallel plate with a diameter of 8 mmφ

[0114] Plate (lower side): Alkali-free glass plate with a diameter of 38 mmφ

[0115] Shear rate: 1 min -1

[0116] Spacing: 0.05 mm

[0117] Sample amount: 20 mg

[0118] Atmosphere: Nitrogen gas flow.

[0119] Advantages of the Invention

[0120] According to the present invention, it is possible to provide a sealant and a composition with improved coatability on an uneven substrate, a display device using the sealant, and a solar cell using the sealant. Detailed Description of Embodiments

[0121] Hereinafter, the embodiments of the present invention will be described in detail. In addition, unless otherwise specified, "~" between numbers in the text means from above to below.

[0122] 1. Sealant

[0123] The sealant of the present embodiment contains a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X). In the viscosity measurement conducted under the following Measurement Condition 1, the viscosity 20 seconds after the start of measurement is designated as V0. 30 seconds after the start of measurement, ultraviolet rays with a wavelength of 365 nm and a power of 30 mW / cm 2 are perpendicularly irradiated onto the alkali-free glass plate from a point 15 cm away from the alkali-free glass plate for 20 seconds (a total of 600 mJ / cm2 ) When the viscosity 60 seconds after the end of the ultraviolet irradiation is set to V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75.

[0124] <Measurement Condition 1>

[0125] Apparatus: Rheometer (Viscoelasticity Measuring Apparatus)

[0126] Temperature: 25°C

[0127] Geometry (Jig) (Upper Side): Parallel Plate with 8 mmφ Diameter, Made of Aluminum

[0128] Plate (Lower Side): Parallel Plate with 38 mmφ Diameter, Made of Non - alkali Glass

[0129] Shear Rate: 1 min -1

[0130] Spacing: 0.05 mm

[0131] Sample Amount: 20 mg

[0132] Atmosphere: Nitrogen Gas Flow

[0133] For the sealant according to the present embodiment, by making the viscosity change rate represented by V1 / V0 fall within the above - mentioned range, it is possible to improve the coatability on uneven substrates such as color filters or substrates with light - emitting diode elements (TFT substrates). The sealant of the present embodiment does not cause coating unevenness on the uneven substrate and is easily spread, so that the remaining bubbles in the coating film can be suppressed. As a result, a cured sealant layer with improved transparency can be formed on the uneven substrate.

[0134] The sealant of the present embodiment is controlled so that the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75. Thereby, the coatability of the sealant of the present embodiment on the uneven substrate can be improved. Although the reason is not yet clear, the following reasons can be considered.

[0135] First, it is considered that by making the viscosity change rate represented by V1 / V0 be equal to or higher than the above - mentioned lower limit value, it is possible to suppress the unevenness of the film thickness caused by excessive wetting and spreading of the coated droplets. And it is considered that by making the viscosity change rate represented by V1 / V0 be equal to or lower than the above - mentioned upper limit value, it is easy to wet and spread on the uneven surface of the substrate, and the remaining bubbles in the coating film or the unevenness of the film thickness can be suppressed.

[0136] Here, in order to adjust the viscosity change rate represented by V1 / V0 to the above range, it is important to appropriately select, for example, the types of the cationically polymerizable compound (A), the cationic polymerization initiator (B), and the curing retarder (X) that constitute the sealant of the present embodiment, and appropriately adjust the content ratios of the respective components; after mixing the respective components, add molecular sieves, allow to stand for dehydration, and then filter; and perform the production in a "yellow light environment" that cuts off short wavelengths of 500 nm or more (below 500 nm) to suppress unexpected polymerization and the like.

[0137] The viscosity change rate represented by V1 / V0 of the sealant of the present embodiment is 1.00 or more and less than 1.75. However, from the viewpoint of further improving the coatability on the uneven substrate, it is preferably 1.74 or less, more preferably 1.73 or less, further preferably 1.70 or less, further preferably 1.65 or less, and further preferably 1.60 or less.

[0138] From the viewpoint of further improving the performance balance of the coatability on the uneven substrate and the flowability during coating of the sealant of the present embodiment, the viscosity V0 of the sealant of the present embodiment is preferably 1 mPa·s or more, more preferably 10 mPa·s or more, further preferably 50 mPa·s or more, further preferably 70 mPa·s or more, further preferably 100 mPa·s or more, and further preferably 150 mPa·s or more. Moreover, it is preferably 1000 mPa·s or less, more preferably 800 mPa·s or less, further preferably 500 mPa·s or less, further preferably 300 mPa·s or less, and further preferably 250 mPa·s or less.

[0139] From the viewpoints of further improving the performance balance of the coatability on the uneven substrate and the flowability during coating of the sealant of the present embodiment and obtaining a longer service life, the viscosity V1 of the sealant of the present embodiment is preferably 1 mPa·s or more, more preferably 10 mPa·s or more, further preferably 50 mPa·s or more, further preferably 70 mPa·s or more, further preferably 100 mPa·s or more, and further preferably 150 mPa·s or more. Moreover, it is preferably 2000 mPa·s or less, more preferably 1500 mPa·s or less, further preferably 1000 mPa·s or less, further preferably 800 mPa·s or less, further preferably 600 mPa·s or less, and further preferably 500 mPa·s or less.

[0140] From the viewpoints of further improving the performance balance between the coatability of the sealant of the present embodiment on the uneven substrate and the flowability during coating and obtaining a longer service life, in the viscosity measurement performed under the above-described measurement condition 1, the viscosity V2 at 10 minutes after the end of the ultraviolet irradiation is preferably 10 mPa·s or more, more preferably 20 mPa·s or more, still more preferably 100 mPa·s or more, still more preferably 150 mPa·s or more, still more preferably 200 mPa·s or more, still more preferably 300 mPa·s or more, and preferably 5000 mPa·s or less, more preferably 4000 mPa·s or less, still more preferably 3000 mPa·s or less, still more preferably 2000 mPa·s or less, still more preferably 1800 mPa·s or less, still more preferably 1500 mPa·s or less, still more preferably 1200 mPa·s or less, still more preferably 1000 mPa·s or less, still more preferably 600 mPa·s or less.

[0141] The sealant of the present embodiment has good coatability on the uneven substrate, and thus can be suitably used as a sealant for light-emitting diode elements, can be more suitably used as a sealant for organic electroluminescence display elements, and can be further suitably used for the bonding of a color filter and an organic electroluminescence display element or the bonding of a color filter and a micro LED.

[0142] The sealant of the present embodiment is preferably capable of being used for sealing a solar cell unit. The solar cell unit of the present embodiment is preferably a perovskite-type solar cell unit.

[0143] Hereinafter, each component of the sealant of the present embodiment will be described.

[0144] (Component (A): Cationically polymerizable compound)

[0145] Component (A) is a compound having cationic polymerizability, and can also be referred to as a compound having a cationic polymerizable group. Examples of the cationic polymerizable group include cyclic ether groups such as an epoxy group (ethylene oxide ring) and an oxetanyl group (oxetane ring); cationically polymerizable vinyl groups, and the like.

[0146] Component (A) preferably contains an epoxy group. And component (A) is preferably photopolymerizable.

[0147] That is, component (A) preferably contains one or more selected from the group consisting of an epoxy compound, an oxetane compound, and a cationically polymerizable vinyl compound, and more preferably contains an epoxy compound.

[0148] Examples of the epoxide compound include: alicyclic compounds (A-1) having an epoxy group (alicyclic epoxide compounds), aromatic compounds (A-2) having an epoxy group (aromatic epoxide compounds), glycidyl ether compounds (A-3), and the like.

[0149] The component (A) may be a compound having one cationic polymerizable group or a compound having two or more polymerizable groups. The component (A) is preferably a compound having two or more cationic polymerizable groups, more preferably a compound having two cationic polymerizable groups.

[0150] From the viewpoints of further improving the coatability on the uneven substrate and further improving the performance balance of the adhesiveness and transparency of the obtained cured body, the component (A) is preferably composed of one or more selected from the group consisting of an alicyclic compound (A-1) having an epoxy group, an aromatic compound (A-2) having an epoxy group, and a glycidyl ether compound (A-3), and more preferably contains an alicyclic compound (A-1) having an epoxy group, an aromatic compound (A-2) having an epoxy group, and a glycidyl ether compound (A-3).

[0151] Furthermore, from the viewpoint of further improving the coatability on the uneven substrate, the component (A) preferably contains a bromine atom. Here, the component (A) containing a bromine atom means containing a compound containing a bromine atom.

[0152] <Component (A1): Alicyclic compound having an epoxy group>

[0153] The component (A1) is a compound having an epoxy group and an alicyclic group. The component (A1) may be a compound having one epoxy group or a compound having two or more epoxy groups. The component (A1) is preferably a compound having two or more epoxy groups, more preferably a compound having two epoxy groups. The component (A1) may be a compound having no aromatic ring. The component (A1) can be used alone or in combination of two or more.

[0154] The component (A1) can be, for example, a compound or its derivative obtained by epoxidizing a compound having a cycloolefin ring. Examples of the cycloolefin ring include a cyclohexene ring, a cyclopentene ring, a pinene ring, and the like. Epoxidation can be carried out using an oxidizing agent, for example. Examples of the oxidizing agent include hydrogen peroxide, peracid, and the like.

[0155] Examples of such component (A1) include one or more selected from the group consisting of 3,4-epoxycyclohexylmethyl 3',4'-epoxycyclohexanecarboxylate, (meth)acrylic 3,4-epoxycyclohexylalkyl ester (for example, 3,4-epoxycyclohexylmethyl (meth)acrylate, etc.), and (3,3',4,4'-diepoxy)bicyclohexane.

[0156] (Component (A1)) can be, for example, a compound obtained by hydrogenating a compound having an epoxy group and an aromatic ring or a derivative thereof. Examples of the compound having an epoxy group and an aromatic ring include bisphenol A type epoxy resin, bisphenol F type epoxy resin, etc. Examples of such component (A-1) include hydrogenated bisphenol A type epoxy resin, hydrogenated bisphenol F type epoxy resin, etc.

[0157] As component (A1), a compound having a 1,2-epoxycyclohexane structure is preferred. Examples of the compound having a 1,2-epoxycyclohexane structure include, for example, a compound represented by formula (A1-1).

[0158]

[0159] In formula (A1-1), X represents a single bond or a linking group (a divalent group having one or more atoms).

[0160] When X is a single bond, the compound represented by formula (A1-1) is (3,3',4,4'-diepoxy)bicyclohexane.

[0161] Examples of the linking group can be a divalent hydrocarbon group, a carbonyl group, an ether bond, an ester bond, a carbonate group, an amide bond, or a group formed by linking a plurality of them.

[0162] X is preferably a linking group. As the linking group, a group having an ester bond is preferred, and a group formed by linking an ester bond and a divalent hydrocarbon group is more preferred. Examples of the compound having a group having an ester bond as the linking group include 3,4-epoxycyclohexyl carboxylic acid 3',4'-epoxycyclohexylmethyl ester (molecular weight 252).

[0163] As the divalent hydrocarbon group, an alkanediyl group is preferred, and an alkanediyl group having 1 or more and 3 or less carbon atoms is more preferred.

[0164] As the compound represented by formula (A1-1), 3,4-epoxycyclohexyl carboxylic acid 3',4'-epoxycyclohexylmethyl ester is preferred.

[0165] From the viewpoint of further improving the performance balance of the coating property of the sealant on the uneven substrate, the storage stability of the sealant, and the moisture resistance of the cured body, the molecular weight of component (A1) is preferably 450 or less, more preferably 400 or less, further preferably 300 or less, and further preferably 280 or less. And the molecular weight of component (A1) can be, for example, 100 or more, can be 150 or more, and can be 200 or more.

[0166] When the component (A1) has a molecular weight distribution, the number-average molecular weight of the component (A1) is preferably within the above range. In addition, in this specification, the number-average molecular weight represents the polystyrene conversion value measured by gel permeation chromatography (GPC) under the following measurement conditions.

[0167] · Solvent (mobile phase): THF

[0168] · Degassing device: ERC-3310 manufactured by ERMA

[0169] · Pump: PU-980 manufactured by JASCO

[0170] · Flow rate: 1.0 ml / min

[0171] · Autosampler: AS-8020 manufactured by Tosoh

[0172] · Column oven: L-5030 manufactured by Hitachi, Ltd.

[0173] · Set temperature: 40 °C

[0174] · Column structure: 2 pieces of TSK guard column MP(×L) 6.0 mm ID × 4.0 cm manufactured by Tosoh and 2 pieces of TSK-GEL MULTIPORE HXL-M 7.8 mm ID × 30.0 cm manufactured by Tosoh, a total of 4 pieces

[0175] · Detector: L-3350 manufactured by Hitachi, Ltd. RI

[0176] · Data processing: SIC480 data station

[0177] <Component (A2): Aromatic compound having an epoxy group>

[0178] The component (A2) is a compound having an epoxy group and an aromatic ring. The component (A2) may be a compound having 1 epoxy group or a compound having 2 or more epoxy groups. The component (A2) is preferably a compound having 2 or more epoxy groups, more preferably a compound having 2 epoxy groups. The component (A2) may also be a compound not having an alicyclic group. The component (A2) can be used alone or in combination of two or more.

[0179] As the component (A2), any one of a monomer, an oligomer, or a polymer can be used. For example, examples include: one or more selected from the group consisting of bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, biphenyl type epoxy resins, naphthalene type epoxy resins, fluorene type epoxy resins, novolac phenol type epoxy resins, cresol novolac type epoxy resins, and their modified products, etc. Further, as the component (A2), examples include: one or more selected from the group consisting of halogenated phenyl glycidyl ethers such as bromophenyl glycidyl ether and dibromophenyl glycidyl ether; epoxy resins containing bromine atoms such as brominated bisphenol A type epoxy resins, brominated bisphenol F type novolac type epoxy resins, and brominated phenolic novolac type epoxy resins; and aromatic epoxy compounds containing bromine atoms, etc. As the aromatic epoxy compound containing bromine atoms, halogenated phenyl glycidyl ether is preferred. As the halogenated phenyl glycidyl ether, dibromophenyl glycidyl ether is preferred.

[0180] (A2) component is preferably composed of one or more selected from the group consisting of compounds having a bisphenol structure (for example, bisphenol A structure, bisphenol F structure, bisphenol S structure, etc.) and aromatic epoxy compounds containing bromine atoms, more preferably composed of one or more selected from the group consisting of bisphenol A type epoxy resins, bisphenol F type epoxy resins, and halogenated phenyl glycidyl ethers, further preferably composed of one or more selected from the group consisting of bisphenol A type epoxy resins, bisphenol F type epoxy resins, and dibromophenyl glycidyl ethers, and further preferably composed of at least one selected from the group consisting of bisphenol F type epoxy resins and dibromophenyl glycidyl ethers.

[0181] From the viewpoint of further improving the performance balance of the coating property of the sealant on the uneven substrate, the storage stability of the sealant, and the moisture resistance of the cured body, the molecular weight of the (A2) component is preferably 100 or more, more preferably 150 or more, further preferably 200 or more, and moreover, preferably 5000 or less, more preferably 1000 or less, and further preferably 450 or less.

[0182] When the (A2) component has a molecular weight distribution, the number average molecular weight of the (A2) component is preferably within the above range. In addition, in this specification, the number average molecular weight represents the polystyrene conversion value measured under the above measurement conditions by gel permeation chromatography (GPC).

[0183] <Component (A3): Glycidyl Ether Compound>

[0184] The component (A3) is a compound having a glycidyl ether group. The component (A3) may be a compound having one epoxy group or a compound having two or more epoxy groups. The component (A3) is preferably a compound having two or more epoxy groups, more preferably a compound having two epoxy groups. The component (A3) may also be a compound having no alicyclic group and aromatic ring. The component (A3) can be used alone or in combination of two or more. The component (A3) is preferably different from the components (A1) and (A2).

[0185] The component (A3) is preferably a diglycidyl ether compound.

[0186] As the diglycidyl ether compound, from the viewpoint of further improving the coatability of the sealant on the uneven substrate, it is preferably one or more selected from the group consisting of diglycidyl ethers of alkylene glycols such as diglycidyl ether of ethylene glycol, diglycidyl ether of propylene glycol, diglycidyl ether of 1,6 - hexanediol, diglycidyl ether of neopentyl glycol; polyglycidyl ethers of polyhydric alcohols such as diglycidyl ether or triglycidyl ether of glycerol or its alkylene oxide adduct; and diglycidyl ethers of polyalkylene glycols such as diglycidyl ether of polyethylene glycol or its alkylene oxide adduct, diglycidyl ether of polypropylene glycol or its alkylene oxide adduct, and is preferably a diglycidyl ether of alkylene glycol. As the diglycidyl ether of alkylene glycol, it is preferably one or more selected from the group consisting of diglycidyl ether of ethylene glycol, diglycidyl ether of propylene glycol, diglycidyl ether of 1,6 - hexanediol, and diglycidyl ether of neopentyl glycol, and more preferably one or two selected from the group consisting of diglycidyl ether of 1,6 - hexanediol and diglycidyl ether of neopentyl glycol.

[0187] Here, examples of the alkylene glycol include ethylene glycol, propylene glycol, 1,6 - hexanediol, neopentyl glycol, etc. Examples of the polyalkylene glycol include polyethylene glycol or its alkylene oxide adduct, polypropylene glycol or its alkylene oxide adduct, etc. Examples of the alkylene oxide include ethylene oxide, propylene oxide, etc.

[0188] Regarding the content of the component (A1) in the sealant of the present embodiment, from the viewpoint of further improving the performance balance of the coatability of the sealant on the uneven substrate and the durability of the cured body, when the total amount of the component (A) in the sealant of the present embodiment is set to 100 parts by mass, it is preferably 10.0 parts by mass or more, more preferably 15.0 parts by mass or more, further preferably 18.0 parts by mass or more, further preferably 30.0 parts by mass or more, further preferably 40.0 parts by mass or more, further preferably 50.0 parts by mass or more, further preferably 55.0 parts by mass or more, further preferably 60.0 parts by mass or more, and moreover, it is preferably 90.0 parts by mass or less, more preferably 85.0 parts by mass or less, further preferably 80.0 parts by mass or less, further preferably 75.0 parts by mass or less.

[0189] Regarding the content of the component (A2) in the sealant of the present embodiment, from the viewpoint of further improving the performance balance of the coatability of the sealant on the uneven substrate and the durability of the cured body, when the total amount of the component (A) in the sealant of the present embodiment is set to 100 parts by mass, it is preferably 5.0 parts by mass or more, more preferably 10.0 parts by mass or more, further preferably 15.0 parts by mass or more, further preferably 20.0 parts by mass or more, further preferably 25.0 parts by mass or more, and moreover, it is preferably 65.0 parts by mass or less, more preferably 60.0 parts by mass or less, further preferably 55.0 parts by mass or less, further preferably 50.0 parts by mass or less, further preferably 45.0 parts by mass or less.

[0190] Regarding the content of the component (A3) in the sealant of the present embodiment, from the viewpoint of further improving the performance balance of the coatability of the sealant on the uneven substrate and the durability of the cured body, when the total amount of the component (A) in the sealant of the present embodiment is set to 100 parts by mass, it is preferably 0.1 parts by mass or more, more preferably 0.2 parts by mass or more, further preferably 0.5 parts by mass or more, further preferably 1.0 parts by mass or more, further preferably 1.5 parts by mass or more, and moreover, it is preferably 90.0 parts by mass or less, more preferably 85.0 parts by mass or less, further preferably 82.0 parts by mass or less, further preferably 20.0 parts by mass or less, further preferably 15.0 parts by mass or less, further preferably 10.0 parts by mass or less, further preferably 5.0 parts by mass or less, further preferably 3.0 parts by mass or less.

[0191] When the total amount of the component (A) in the sealant of the present embodiment is set to 100 parts by mass, the total content of the components (A1), (A2) and (A3) in the sealant of the present embodiment is preferably 60 parts by mass or more, more preferably 70 parts by mass or more, further preferably 80 parts by mass or more, further preferably 95 parts by mass or more, further preferably 98 parts by mass or more, and may also be 100 parts by mass.

[0192] ((B) Cationic polymerization initiator)

[0193] Examples of the component (B) include one or more selected from the group consisting of a photo cationic polymerization initiator capable of initiating cationic polymerization of the component (A) by photoactivation and a thermal cationic polymerization initiator capable of initiating cationic polymerization of the component (A) by thermal activation, and a photo cationic polymerization initiator is preferred.

[0194] Examples of the photo cationic polymerization initiator include arylsulfonium salt derivatives (for example, Cyracure UVI-6990, Cyracure UVI-6974 manufactured by Dow Chemical Company, Adeka Optomer SP-150, Adeka Optomer SP-152, Adeka Optomer SP-170, Adeka Optomer SP-172 manufactured by ADEKA Corporation, CPI-100P, CPI-101A, CPI-200K, CPI-210S, CPI-310FG, LW-S1 manufactured by San-Apro Corporation, Ciba-Cure-1190 manufactured by Double Bond Corporation, etc.), aryl iodonium salt derivatives (for example, Irgacure 250 manufactured by Ciba Specialty Chemicals Corporation, RP-2074 manufactured by Rhodia Japan Corporation, etc.), allene-ion complex derivatives, diazonium salt derivatives, triazine-based initiators, and other acid generators such as halides.

[0195] Examples of the thermal cationic polymerization initiator include any thermal cationic polymerization initiator that is activated by heating to induce ring opening of a ring-opening polymerizable group. Examples of the thermal cationic polymerization initiator include onium salt compounds such as quaternary ammonium salts, phosphonium salts, and sulfonium salts.

[0196] Commercially available products of the thermal cationic polymerization initiator include, for example: Adekaopton CP-66, Adekaopton CP-77 (manufactured by ADEKA Corporation), San-Aid SI-60L, San-Aid SI-80L, San-Aid SI-100L (manufactured by Sanshin Chemical Industry Co., Ltd.), CI Series (manufactured by Nippon Soda Co., Ltd.), and the like.

[0197] As the component (B), from the viewpoint of more significantly obtaining the above effects produced by using two or more kinds of curing retarders, an onium salt compound is preferably included. As the onium salt compound, it is preferably included one or more selected from the group consisting of arylsulfonium salt derivatives, aryl iodonium salt derivatives, and diazonium salt derivatives, and more preferably included arylsulfonium salt derivatives. As the anion, it is preferably included one or more selected from the group consisting of antimonate and gallate.

[0198] In order to be easily mixed with other components such as the component (A), the component (B) can use a component pre-dissolved in a solvent. The solvent is not particularly limited, and examples thereof include carbonate esters such as propylene carbonate, ethylene carbonate, 1,2-butylene carbonate, dimethyl carbonate, and diethyl carbonate.

[0199] Regarding the content of the component (B) in the sealant of the present embodiment, based on 100 parts by mass of the component (A), from the viewpoint of further improving the curability of the sealant, it is preferably 0.01 part by mass or more, more preferably 0.05 part by mass or more, further preferably 0.10 part by mass or more, further preferably 0.15 part by mass or more, further preferably 0.20 part by mass or more. From the viewpoint of further improving the adhesion durability of the cured body, it is preferably 5.0 parts by mass or less, more preferably 3.0 parts by mass or less, further preferably 2.0 parts by mass or less, further preferably 1.0 part by mass or less, further preferably 0.70 part by mass or less, further preferably 0.50 part by mass or less, further preferably 0.30 part by mass or less.

[0200] ((X) component: curing retarder)

[0201] The sealant of the present embodiment contains a curing retarder as the (X) component.

[0202] From the viewpoint of the performance balance of further improving the coatability of the sealant on the uneven substrate and the storage stability of the sealant, the component (X) is preferably composed of one or more selected from the group consisting of a phosphoric acid-based curing retarder ((C) component), an ether-based curing retarder ((D) component), a thioether-based curing retarder ((E) component), a metal complex-based curing retarder ((F) component), and a nitroxide radical-based curing retarder ((G) component), and more preferably composed of one or more selected from the group consisting of a phosphoric acid-based curing retarder ((C) component) and an ether-based curing retarder ((D) component).

[0203] From the viewpoint of obtaining a longer service life, the content of the component (X) in the sealant of the present embodiment is preferably 0.10 parts by mass or more, more preferably 0.20 parts by mass or more, further preferably 0.50 parts by mass or more, further preferably 0.80 parts by mass or more, further preferably 1.0 part by mass or more, based on 100 parts by mass of the component (A). From the viewpoint of the performance balance of further improving the moisture resistance and adhesiveness of the cured product, it is preferably 10.0 parts by mass or less, more preferably 5.0 parts by mass or less, further preferably 2.0 parts by mass or less, further preferably 1.5 parts by mass or less.

[0204] <(C) component: phosphoric acid-based curing retarder>

[0205] The phosphoric acid-based curing retarder is a curing retarder selected from the group consisting of phosphate esters ((C1) component) and phosphite esters ((C2) component). The component (C) can be used alone or in combination of two or more.

[0206] Examples of the (C1) component include: diethylbenzyl phosphate, trimethyl phosphate, triethyl phosphate, tri-n-butyl phosphate, tris(butoxyethyl) phosphate, tris(2-ethylhexyl) phosphate, (RO)3P=O (R is lauryl, cetyl, stearyl or oleyl), tris(2-chloroethyl) phosphate, tris(2-dichloropropyl) phosphate, triphenyl phosphate, butyl pyrophosphate, tricresyl phosphate, tris(xylene) phosphate, dioctylphenyl phosphate, cresyldiphenyl phosphate, xylenyl diphosphate, monobutyl phosphate, dibutyl phosphate, di-2-ethylhexyl phosphate, monoisodecyl phosphate, ammonium ethyl acid phosphate, 2-ethylhexyl acid phosphate salt, etc. The component (C1) can be used alone or in combination of two or more.

[0207] From the viewpoints of moderate reactivity with cations and reduction of gas evolution, the component (C1) is preferably composed of one or more selected from the group consisting of the compound represented by formula (C1-1), the compound represented by formula (C1-2), and the compound represented by formula (C1-3), and more preferably composed of the compound represented by formula (C1-2).

[0208]

[0209] In formulas (C1-1), (C1-2), and (C1-3), R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represent a hydrocarbon group which may have a substituent.

[0210] R 2 , R 3 , and R 4 in formula (C1-2), and R 5 and R 6 in formula (C1-3) are preferably the same group in each formula.

[0211] Examples of the substituent which the hydrocarbon group in R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 may have include, for example, oxyalkyl groups. The hydrocarbon groups in R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are preferably unsubstituted hydrocarbon groups.

[0212] The hydrocarbon groups in R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are preferably alkyl groups or aryl groups, more preferably alkyl groups or phenyl groups, and still more preferably alkyl groups. The number of carbon atoms of the alkyl group may be, for example, 1 or more and 18 or less, preferably 4 or more and 13 or less.

[0213] Examples of the compound represented by formula (C1-1) include monoalkyl phosphates (i.e., compounds in which R 1 is an alkyl group), and specific examples include monoethyl phosphate, monon-butyl phosphate, mono(butoxyethyl) phosphate, mono(2-ethylhexyl) phosphate, and the like.

[0214] The compound represented by formula (C1-2) is preferably a trialkyl phosphate (i.e., a compound in which R 2 , R 3 , and R 4 are alkyl groups). At this time, R2 , R 3 and R 4 The number of carbon atoms of the alkyl group of R is preferably 1 or more and 18 or less, more preferably 4 or more and 12 or less, and still more preferably 8.

[0215] Specific examples of the trialkyl phosphate include: triethyl phosphate, tributyl phosphate, tris(butoxyethyl) phosphate, tris(2-ethylhexyl) phosphate, (RO)3P=O (where R is lauryl, cetyl, stearyl or oleyl), etc.

[0216] Examples of the compound represented by the formula (C1-3) include: dialkyl phosphates (i.e., compounds where R 5 and R 6 are alkyl groups), etc. Specific examples of the dialkyl phosphate include: dibutyl phosphate, bis(2-ethylhexyl) phosphate, etc.

[0217] The component (C2) is a phosphite. Examples of the component (C2) include: trimethyl phosphite, triethyl phosphite, tributyl phosphite, tris(2-ethylhexyl) phosphite, triisooctyl phosphite, tridecyl phosphite, triisodecyl phosphite, tris(tridecyl) phosphite, trioleyl phosphite, tristearyl phosphite, triphenyl phosphite, tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, phenyldiisooctyl phosphite, phenyldiisodecyl phosphite, diphenylmono(2-ethylhexyl) phosphite, diphenylisooctyl phosphite, diphenylmonodecyl phosphite, diphenylmonoisodecyl phosphite, diphenylmono(tridecyl) phosphite, bis(nonylphenyl)dinonylphenyl phosphite, tetraphenyldipropyleneglycol diphosphite, poly(dipropylene glycol)phenyl phosphite, diisodecyl pentaerythritol diphosphite, bis(tridecyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, bis(nonylphenyl) pentaerythritol diphosphite, tetraphenyltetrakis(tridecyl) pentaerythritol tetraphosphite, tetrakis(tridecyl)-4,4'-isopropylidenediphenyl phosphite, trilauryl trithiophosphite, dimethyl phosphite, dibutyl phosphite, bis(2-ethylhexyl) phosphite, dilauryl phosphite, dioleyl phosphite, diphenyl phosphite, diphenylmono(2-ethylhexyl) phosphite, diphenylmono(tridecyl) phosphite, etc. The component (C2) can be used alone or in combination of two or more.

[0218] From the viewpoint of moderate reactivity with cations, the component (C2) is preferably one or more selected from the group consisting of the compounds represented by formula (C2-1), the compounds represented by formula (C2-2), the compounds represented by formula (C2-3), the compounds represented by formula (C2-4), the compounds represented by formula (C2-5), and the compounds represented by formula (C2-6).

[0219]

[0220]

[0221] In formulas (C2-1) to (C2-6), R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , and R 17 each independently represent a hydrocarbon group which may have a substituent.

[0222] Examples of the substituents which the hydrocarbon groups for R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , and R 17 may have include, for example, oxyalkyl groups. The hydrocarbon groups for R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , and R 17 are preferably unsubstituted hydrocarbon groups.

[0223] R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , R16 and R 17 The alkyl group in is preferably an alkyl group or an aryl group, more preferably an alkyl group or a phenyl group, and still more preferably an alkyl group. The number of carbon atoms of the alkyl group can be, for example, 1 or more and 30 or less, preferably 1 or more and 18 or less. As the aryl group, a phenyl group is preferred.

[0224] R in formula (C2-2) 8 and R 9 , R in formula (C2-3) 10 , R 11 and R 12 , R in formula (C2-4) 13 and R 14 , and R in formula (C2-5) 15 and R 16 are preferably the same as each other in each formula.

[0225] As the compound represented by formula (C2-1), for example, there can be mentioned: monoalkyl phosphite (that is, a compound in which R 7 is an alkyl group), etc.

[0226] As the compound represented by formula (C2-2), for example, there can be mentioned: dialkyl phosphite (that is, a compound in which R 8 and R 9 are alkyl groups), etc.

[0227] As the compound represented by formula (C2-3), for example, there can be mentioned: trialkyl phosphite (that is, a compound in which R 10 , R 11 and R 12 are alkyl groups), phenyl phosphite (that is, a compound in which one or more of R 10 , R 11 and R 12 are phenyl groups), etc. Specific examples of the trialkyl phosphite include: triethyl phosphite, tris(2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, tris(tridecyl) phosphite, trioleyl phosphite, etc. Specific examples of the phenyl phosphite include: diphenyl monodecyl phosphite, etc.

[0228] As the compound represented by formula (C2-4), for example, there can be mentioned: bis(alkyl)pentaerythritol diphosphite (that is, a compound in which R 13 and R 14 are alkyl groups), etc. And specific examples of the compound represented by formula (C2-4) include: bis(decyl)pentaerythritol diphosphite, bis(tridecyl)pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, etc.

[0229] As the compound represented by formula (C2-5), for example, dialkyl phosphites (i.e., compounds where R 15 and R 16 are alkyl groups) etc. can be cited. And, as specific examples of the compound represented by formula (C2-5), diethyl phosphite, bis(2-ethylhexyl) phosphite, dilauryl phosphite, dioleyl phosphite etc. can be cited.

[0230] As the compound represented by formula (C2-6), for example, monoalkyl phosphites (i.e., compounds where R 17 is an alkyl group) etc. can be cited. And, as specific examples of the compound represented by formula (C2-6), monoethyl phosphite, mono(2-ethylhexyl) phosphite, monolauryl phosphite, monooleyl phosphite etc. can be cited.

[0231] As the (C2) component, it is preferably one or more selected from the group consisting of trimethyl phosphite, triethyl phosphite, tri-n-butyl phosphite, tris(2-ethylhexyl) phosphite, triisooctyl phosphite, tridecyl phosphite, triisodecyl phosphite, tris(tridecyl) phosphite, trioleyl phosphite, tristearyl phosphite, triphenyl phosphite, tris(nonylphenyl) phosphite, diisodecyl pentaerythritol diphosphite, bis(tridecyl) pentaerythritol diphosphite, distearyl pentaerythritol diphosphite, bis(nonylphenyl) pentaerythritol diphosphite, dimethyl phosphite, dibutyl phosphite, bis(2-ethylhexyl) phosphite, dilauryl phosphite and dioleyl phosphite, and more preferably one or more selected from the group consisting of trimethyl phosphite, triethyl phosphite, tri-n-butyl phosphite, tris(2-ethylhexyl) phosphite, triisooctyl phosphite, tridecyl phosphite, triisodecyl phosphite, tris(tridecyl) phosphite, trioleyl phosphite, tristearyl phosphite, triphenyl phosphite and tris(nonylphenyl) phosphite.

[0232] When the sealant of the present embodiment contains the (C) component, from the viewpoint of obtaining a longer service life, the content of the (C) component in the sealant of the present embodiment is preferably 0.001 part by mass or more, more preferably 0.005 part by mass or more, further preferably 0.01 part by mass or more, further preferably 0.02 part by mass or more, further preferably 0.05 part by mass or more, further preferably 0.10 part by mass or more, further preferably 0.20 part by mass or more, and from the viewpoint of further improving the performance balance of the moisture resistance and adhesiveness of the cured body, it is preferably 5.0 parts by mass or less, more preferably 2.0 parts by mass or less, further preferably 1.0 parts by mass or less, further preferably 0.5 part by mass or less, relative to 100 parts by mass of the (A) component.

[0233] <(D) Component: Ether-based Curing Retarder>

[0234] (D) The component is a curing retarder having an ether bond. The (D) component can be used alone or in combination of two or more.

[0235] (D) The component can be a chain ether or a cyclic ether. Examples of the chain ether include: polyalkylene oxides such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol. Examples of the polyalkylene oxide include: polyoxyethylene dimethyl ether. Examples of the cyclic ether include: crown ethers. Examples of the crown ether include: 18-crown-6-ether, 15-crown-5-ether, etc.

[0236] From the viewpoint of moderate reactivity with cations, the (D) component is preferably a cyclic ether, more preferably a crown ether, and further preferably 18-crown-6-ether.

[0237] When the sealant in the present embodiment contains the (D) component, the content of the (D) component in the sealant of the present embodiment is preferably 0.01 part by mass or more, more preferably 0.02 part by mass or more, further preferably 0.05 part by mass or more, further preferably 0.10 part by mass or more, further preferably 0.20 part by mass or more, further preferably 0.50 part by mass or more, based on 100 parts by mass of the (A) component, from the viewpoint of obtaining a longer service life, and preferably 10.0 parts by mass or less, more preferably 5.0 parts by mass or less, further preferably 3.0 parts by mass or less, further preferably 2.0 parts by mass or less, further preferably 1.5 parts by mass or less, from the viewpoint of further improving the performance balance of moisture resistance and adhesiveness of the cured body.

[0238] <(E) Component: Thioether-based Curing Retarder>

[0239] (E) The component is a curing retarder having a thioether bond. The (E) component can be used alone or in combination of two or more.

[0240] (E) The component can be a chain thioether or a cyclic thioether. Examples of the chain thioether include: diethyl sulfide, isobutyl sulfide, dithiodiethylene glycol, etc. Examples of the cyclic thioether include: 1,3-dithiane, 1,3,5-trithiane, 1,4,7-trithiacyclononane, 1,4,8,11-tetrathiacyclotetradecane, etc.

[0241] <(F) Component: Metal Complex-based Curing Retarder>

[0242] (F) The component is a metal complex that functions as a curing retarder. Examples of the (F) component include: metal acetylacetonates, etc. The (F) component can be used alone or in combination of two or more.

[0243] As metal acetylacetonates, for example, acetylacetonates of aluminum, titanium, zinc, zirconium, copper, etc. can be cited. Among these, acetylacetonates of aluminum or zinc are preferred, and aluminum acetylacetonate is more preferred.

[0244] When the sealant of the present embodiment contains the component (F), the content of the component (F) in the sealant of the present embodiment is preferably 0.01 part by mass or more, more preferably 0.02 part by mass or more, relative to 100 parts by mass of the component (A), from the viewpoint of obtaining a longer service life, and is preferably 2.0 parts by mass or less, more preferably 1.0 part by mass or less, from the viewpoint of further improving the performance balance of the moisture resistance and adhesiveness of the cured body.

[0245] <(G) component: nitroxide-based curing retarder>

[0246] (G) component is a curing retarder having a nitroxide group. The component (G) can be used alone or in combination of two or more.

[0247] Examples of the component (G) include 2,2,6,6-tetramethyl-1-piperidinyloxy (hereinafter referred to as TEMPO) and 4-benzyloxyoxy-TEMPO, 4-methoxy-TEMPO, 4-carboxy-4-amino-TEMPO, 4-chloro-TEMPO, 4-hydroxyimine-TEMPO, 4-hydroxy-TEMPO, 4-syloxyl-TEMPO, etc. as its derivatives; 4-amino-TEMPO, 2,2,5,5-tetramethyl-1-pyrrolidinyloxy (hereinafter referred to as PROXYL) and 3-carboxy-PROXYL, 3-carbamoyl-PROXYL, 2,2-dimethyl-4,5-cyclohexyl-PROXYL, 3-syloxyl-PROXYL, 3-hydroxyimine-PROXYL, 3-aminomethyl-PROXYL, 3-methoxy-PROXYL, 3-tert-butyl-PROXYL, 3-maleimide-PROXYL, 3,4-di-tert-butyl-PROXYL, 3-carboxylic acid-2,2,5,5-tetramethyl-1-pyrrolidinyloxy, etc. as its derivatives; dialkyl nitroxides or di-tert-butyl nitroxide, tert-butyl tert-amyl nitroxide, etc. as its derivatives; diaryl nitroxides or diphenyl nitroxide, etc. as its derivatives; 4,4-dimethyl-1-oxazolidinyloxy (DOXYL) or 2-di-tert-butyl-DOXYL, 5-decane-DOXYL, 2-cyclohexane-DOXYL, etc. as its derivatives; etc.

[0248] As the component (G), 2,2,6,6-tetramethyl-1-piperidinyloxy is preferred.

[0249] When the sealant of the present embodiment contains the component (G), the content of the component (G) in the sealant of the present embodiment is preferably 0.01 part by mass or more, more preferably 0.02 part by mass or more, based on 100 parts by mass of the component (A), from the viewpoint of obtaining a longer service life, and is preferably 2.0 parts by mass or less, more preferably 1.0 part by mass or less, from the viewpoint of further improving the performance balance of moisture resistance and adhesiveness of the cured body.

[0250] The sealant of the present embodiment preferably contains the component (C) and the component (D) as the component (X). When the sealant of the present embodiment contains the component (C) and the component (D), from the viewpoint of further improving the coatability of the sealant on the uneven substrate, the mass ratio (C1 / D1) of the content C1 of the component (C) to the content D1 of the component (D) is preferably 0.001 or more, more preferably 0.005 or more, further preferably 0.01 or more, further preferably 0.05 or more, further preferably 0.10 or more, further preferably 0.20 or more, and from the viewpoint of further improving the moisture resistance and adhesiveness of the cured body, it is preferably 2.0 or less, more preferably 1.0 or less, further preferably 0.5 or less.

[0251] Regarding the total content of the component (A), the component (B) and the component (X) in the sealant of the present embodiment, when the total amount of the sealant of the present embodiment is set to 100% by mass, from the viewpoint of further improving the coatability on the uneven substrate, it is preferably 60% by mass or more, more preferably 70% by mass or more, further preferably 80% by mass or more, further preferably 90% by mass or more, further preferably 95% by mass or more, further preferably 98% by mass or more, and may be 100% by mass or less.

[0252] (Other components)

[0253] The sealant of the present embodiment may further contain other components in addition to the component (A), the component (B) and the component (X).

[0254] Examples of other components include: photosensitizers, silane coupling agents, antioxidants, inorganic fillers, resin particles, metal deactivators, fillers, stabilizers, neutralizing agents, lubricants, antibacterial agents.

[0255] The manufacturing method of the sealant of the present embodiment is not particularly limited as long as the above components can be sufficiently mixed. As the mixing method of each component, there is no particular limitation, and examples include: a stirring method using the stirring force with the rotation of a propeller, a method using a general disperser such as a planetary mixer based on rotation and revolution, etc. From the aspect of low cost and stable mixing, these mixing methods are preferred.

[0256] The method of using the sealant of the present embodiment is not particularly limited. For example, by applying the sealant onto an object (e.g., a component constituting a display device) and curing the sealant on the object, a cured sealant layer composed of a cured body of the sealant can be formed.

[0257] Moreover, the sealant of the present embodiment can be cured into a specified shape (e.g., film shape, sheet shape, etc.) to form a cured sealant layer having a specified shape. In this case, for example, when assembling a display device, by disposing the cured sealant layer on a light-emitting diode element, the light-emitting diode element can be sealed.

[0258] In the present embodiment, the cured sealant layer may be composed of a cured body of the sealant, or may include a cured body of the sealant and other constituent materials. Examples of other constituent materials include inorganic layers such as silicon nitride film, silicon oxide film, silicon oxynitride; inorganic fillers such as silica, mica, kaolin, talc, alumina, etc.

[0259] According to the sealant of the present embodiment, a display device including a light-emitting diode element and a cured sealant layer can be easily manufactured.

[0260] From the viewpoint of further improving the coatability of the sealant on a concavo-convex substrate, the liquid specific gravity of the sealant of the present embodiment at 25°C in an atmosphere is preferably 1.10 or more, more preferably 1.12 or more, further preferably 1.15 or more, still further preferably 1.20 or more, and moreover, preferably 4.0 or less, more preferably 3.0 or less, further preferably 2.5 or less, still further preferably 2.0 or less, still further preferably 1.5 or less. The liquid specific gravity of the sealant of the present embodiment represents the value measured using a 5 mL Gay-Lussac type specific gravity bottle in accordance with 8.2.2 of JIS-K-0061. The sealant of the present embodiment can appropriately adjust the types and contents of the respective components so that the liquid specific gravity is within the above range.

[0261] From the viewpoint of further improving the coatability of the sealant on a concavo-convex substrate, the static surface tension of the sealant of the present embodiment obtained by the sessile drop method is preferably 50 mN / m or less, more preferably 40 mN / m or less, further preferably 35 mN / m or less. The lower limit value of the static surface tension is not particularly limited, and for example, it may be 10 mN / m or more, may be 20 mN / m or more, or may be 25 mN / m or more. The sessile drop method is a method of extruding a liquid from the tip of a tube and calculating the surface tension based on the shape of the pendant drop that falls.

[0262] 2. Cured Body

[0263] The cured body of the present embodiment is cured from the sealant of the present embodiment.

[0264] That is, by curing the sealant of the present embodiment, a cured product containing a polymer of the cationically polymerizable compound (A) can be obtained. The cured product of the present embodiment can be suitably used as a cured sealant layer (especially a cured sealant layer for a light-emitting diode element).

[0265] The sealant of the present embodiment, for example, after light irradiation, moderately increases in viscosity, and then cures as the polymerization reaction of the cationically polymerizable compound (A) proceeds. The sealant after light irradiation can also be rapidly cured by heating.

[0266] The light source of the light irradiated on the sealant of the present embodiment is not particularly limited, and examples thereof include: halogen lamps, metal halide lamps, high-power metal halide lamps (containing indium, etc.), low-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, xenon lamps, xenon excimer lamps, xenon flash lamps, LEDs, etc. From the aspect of being able to efficiently irradiate energy rays corresponding to the reaction wavelength of the photo cationic polymerization initiator, these light sources are preferred.

[0267] The radiation wavelengths or energy distributions of the above light sources are different. Therefore, the above light sources can be appropriately selected according to the reaction wavelength of the photo cationic polymerization initiator, etc. And natural light (sunlight) can also be a reaction initiation light source for the sealant.

[0268] As the irradiation method, direct irradiation, condensing irradiation using a mirror, etc., and condensing irradiation using an optical fiber, etc. can be performed. Irradiation using a low-wavelength cut-off filter, a heat-ray cut-off filter, a cold mirror, etc. can also be performed.

[0269] The irradiation amount of light is not particularly limited and can be appropriately adjusted according to the thickness of the sealant coating film, etc. The irradiation amount of light can be, for example, 50 mJ / cm 2 or more and 20000 mJ / cm 2 or less, preferably 100 mJ / cm 2 or more and 10000 mJ / cm 2 or less.

[0270] In the case of performing heating (also referred to as post-heating.) after light irradiation, from the viewpoint of avoiding damage to light-emitting diode elements such as organic EL display elements, the heating temperature is preferably 150°C or lower, more preferably 80°C or lower.

[0271] 3. Display device

[0272] The display device of the present embodiment includes: a light-emitting diode element; a substrate; and a cured sealant layer formed of the cured product of the present embodiment, which is located between the light-emitting diode element and the substrate.

[0273] The light-emitting diode element includes, for example, an organic electroluminescent display element or a micro LED, and preferably includes an organic electroluminescent display element.

[0274] In addition, the light-emitting diode element may also be in the form of a substrate (TFT substrate) with a light-emitting diode element as a concavo-convex substrate.

[0275] The substrate is not particularly limited and includes, for example, one or more selected from the group consisting of a color filter, a glass substrate, a silicon substrate, and a plastic substrate, etc., and preferably includes a color filter. Since the sealant of the present embodiment has good coatability on the concavo-convex substrate, when using a color filter as the concavo-convex substrate as the substrate, the effects of the present embodiment can be obtained more effectively.

[0276] The manufacturing method of the display device of the present embodiment may include, for example: a coating step of coating the sealant of the present embodiment on a first component; an irradiation step of irradiating light on the coated sealant; and a bonding step of bonding the first component and the second component via the sealant irradiated with light. According to this manufacturing method, the bonding surfaces of the first component and the second component constituting the display device can be sealed by curing the sealant layer.

[0277] As a method of coating the sealant of the present embodiment on the first component, for example, coating film formation methods such as a solution coating method or a spraying method, or a flash evaporation method, an inkjet method, etc. can be cited. Among these, from the viewpoint of further improving productivity, an inkjet method is preferred.

[0278] The film thickness of the sealant coated on the first component is, for example, 1 μm or more and 15 μm or less, preferably 3 μm or more and 10 μm or less. By forming a film of 1 μm or more and curing it, it is easy to obtain a sufficient sealing ability as a cured sealant layer. And by the film thickness being 15 μm or less, it contributes to the miniaturization of the display device, the reduction of manufacturing costs, etc.

[0279] The sealant disposed on the first component in the coating step is thickened by light irradiation. In the bonding step, the first component and the second component are bonded by the sealant by bonding the first component and the second component during the period before the sealant irradiated with light is cured. The sealant between the first component and the second component is cured by post-heating as needed to form a cured sealant layer.

[0280] In addition, the display device of the present embodiment can also be manufactured by a method of coating the sealant of the present embodiment on the first component, bonding the second component via the sealant, and then irradiating light on the sealant.

[0281] In the above manufacturing method, for the steps after the irradiation step, it can also be carried out under light shielding. Thus, the second component can be bonded to the first component without being exposed to light.

[0282] The first component and the second component may each be a component constituting a display device, and there is no particular limitation.

[0283] In one mode, the first component may be a light-emitting diode element, and the second component may be a substrate. Further, in another mode, the first component may be a substrate, and the second component may be a light-emitting diode element. That is, one of the first component and the second component may be a substrate, and the other may be a light-emitting diode element.

[0284] 4. Solar cell

[0285] The solar cell of the present embodiment includes: a solar cell unit; a base material; and a cured sealing layer containing the cured product of the present embodiment and located between the solar cell unit and the base material. The solar cell of the present embodiment is preferably a perovskite solar cell unit.

[0286] 5. Composition

[0287] The composition of the present embodiment contains a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X). In the viscosity measurement under the following measurement condition 1, the viscosity 20 seconds after the start of measurement is set as V0, and 30 seconds after the start of measurement, ultraviolet rays with a wavelength of 365 nm and 30 mW / cm 2 are perpendicularly irradiated from a point 15 cm away from a non-alkali glass plate to the non-alkali glass plate for 20 seconds (a total of 600 mJ / cm 2 ). When the viscosity 60 seconds after the end of the ultraviolet irradiation is set as V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75.

[0288] <Measurement condition 1>

[0289] Apparatus: Rheometer (viscoelasticity measurement apparatus)

[0290] Temperature: 25°C

[0291] Geometry (fixture) (upper side): Aluminum parallel plate with a diameter of 8 mmφ

[0292] Plate (lower side): Non-alkali glass plate with a diameter of 38 mmφ

[0293] Shear rate: 1 min -1

[0294] Spacing: 0.05 mm

[0295] Sample amount: 20 mg

[0296] Atmosphere: Nitrogen gas flow

[0297] For the composition according to this embodiment, by making the viscosity change rate represented by V1 / V0 fall within the above range, the coatability on uneven substrates such as color filters or substrates with light-emitting diode elements (TFT substrates) can be improved. The composition of this embodiment does not exhibit coating unevenness on uneven substrates and spreads easily. Therefore, the residual bubbles in the coating film can be suppressed. As a result, a cured sealing layer with improved transparency can be formed on the uneven substrate.

[0298] The composition of this embodiment is controlled such that the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75. Thereby, the coatability of the composition of this embodiment on uneven substrates can be improved. Although the reason is not yet clear, the following reasons can be considered.

[0299] First, it is considered that by making the viscosity change rate represented by V1 / V0 equal to or higher than the above lower limit value, the film thickness becoming uneven due to excessive wetting and spreading of the coated droplets can be suppressed. And it is considered that by making the viscosity change rate represented by V1 / V0 equal to or lower than the above upper limit value, it is easy to wet and spread on the uneven surface of the substrate, and the residual bubbles or the film thickness becoming uneven in the coating film can be suppressed.

[0300] Here, in order to adjust the viscosity change rate represented by V1 / V0 to the above range, it is important to, for example, appropriately select the types of the cationic polymerizable compound (A), the cationic polymerization initiator (B), and the curing retarder (X) constituting the composition of this embodiment, and appropriately adjust the content ratios of the respective components; after mixing the respective components, add molecular sieves, stand for dehydration and then filter; and carry out the manufacturing in a "yellow light environment" with a short wavelength of 500 nm or more to suppress unexpected polymerization, etc.

[0301] The preferred modes and preferred contents of the respective components constituting the composition of this embodiment, as well as the preferred physical properties and characteristics of the composition of this embodiment, can be selected in the same manner as the sealant of this embodiment, and thus the description is omitted here.

[0302] Moreover, the composition of this embodiment can be manufactured by the same manufacturing method as the sealant of this embodiment.

[0303] The composition of this embodiment can be used, for example, as a sealant, an adhesive, a photosensitive resin layer, an insulating resin layer, a heat-conductive resin layer, a coating material, etc.

[0304] The embodiments of the present invention have been described above, but these are examples of the present invention, and various structures other than the above can be adopted. And the present invention is not limited to the above embodiments, and modifications, improvements, etc. within the scope of achieving the object of the present invention are included in the present invention.

[0305] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the examples. Unless otherwise specified, the tests in the examples were carried out at 23 °C and a relative humidity of 50% by mass.

[0306] (Examples 1 to 4, Comparative Examples 1 to 2)

[0307] <Preparation of sealant>

[0308] In an environment of yellow light with a short wavelength of 500 nm or more cut off, after mixing the respective components shown in Table 1 in the composition ratio (parts by mass) described in Table 1, static dehydration was carried out using molecular sieves (manufactured by Union Showa Co., Ltd., 5A granular), and then filtration was carried out, whereby the sealants of the examples and comparative examples were prepared.

[0309] For the obtained sealants, various viscosities, liquid specific gravities, and static surface tensions of the sealants were measured by the evaluation methods shown below. And for the obtained sealants, the coatability was evaluated by the evaluation methods shown below. And under the photocuring conditions shown below, the obtained sealants were cured to form cured bodies, and the transparency was evaluated by the evaluation methods shown below. The evaluation results are shown in Table 1.

[0310] The meanings of the respective components shown in Table 1 are as follows.

[0311] (Component (A1): Alicyclic compound having an epoxy group)

[0312] (a1-1) 3,4-Epoxycyclohexylmethyl 3',4'-epoxycyclohexanecarboxylate ("Celloxide 2021P" manufactured by Daicel Chemical Industries, Ltd.)

[0313] (a1-2) (3,3',4,4'-Diepoxy)bicyclohexane ("Cell oxide8010" manufactured by Daicel Chemical Industries, Ltd.)

[0314] (Component (A2): Aromatic compound having an epoxy group)

[0315] (a2-1) Bisphenol A type epoxy resin (molecular weight 360 - 390, "jE R828" manufactured by Mitsubishi Chemical Corporation)

[0316] (a2-2) Bisphenol F type epoxy resin (molecular weight 320 - 340, "jE R806" manufactured by Mitsubishi Chemical Corporation)

[0317] (a2-3)Dibromophenyl glycidyl ether ("BR-250H" manufactured by Nippon Kayaku Co., Ltd., molecular weight 308)

[0318] ((A3) Component: Glycidyl ether compound)

[0319] (a3-1)Diglycidyl ether of 1,6-hexanediol ("ED-503G" manufactured by ADEKA Corporation)

[0320] (a3-2)Diglycidyl ether of neopentyl glycol ("Denacol EX-211" manufactured by Nagase Kasei Co., Ltd.)

[0321] ((B) Component: Photo cationic polymerization initiator)

[0322] (b-1)Triaryl sulfonium hexafluoroantimonate ("Adeka Optomer SP-170" manufactured by ADEKA Corporation, the anion type is hexafluoroantimonate)

[0323] (b-2)Triaryl sulfonium - tetra - pentafluorophenyl gallate ("CPI-310FG" manufactured by San-Apro Limited)

[0324] ((C) Component: Phosphoric acid-based curing retarder)

[0325] (c-1)Tris(2-ethylhexyl) phosphate ("TOP" manufactured by Daihachi Chemical Industry Co., Ltd.)

[0326] ((D) Component: Ether-based curing retarder)

[0327] (d-1)18-Crown-6-ether ("Crown ether O-18" manufactured by Tokyo Chemical Industry Co., Ltd.)

[0328] [Method for measuring viscosity]

[0329] The viscosity of the sealants in the examples and comparative examples was measured under the following measurement conditions 1.

[0330] The viscosity 20 seconds after the start of viscosity measurement was defined as V0. 30 seconds after the start of measurement, ultraviolet light with a wavelength of 365 nm and 30 mW / cm 2 was perpendicularly irradiated onto the non-alkali glass plate from a point 15 cm away from the non-alkali glass plate for 20 seconds (total 600 mJ / cm 2) Set the viscosity 60 seconds after the end of the ultraviolet irradiation as V1, and set the viscosity 10 minutes after the end of the ultraviolet irradiation as V2. Here, the ultraviolet irradiation was performed using an ultraviolet irradiation device (manufactured by HOYA Corporation, ultra-high pressure mercury lamp irradiation device "EXECURE3000") attached to a rheometer while continuously measuring the viscosity. And, "at the start of measurement" means when the sample is placed in the device and rotation starts.

[0331] <Measurement condition 1>

[0332] Device: Rheometer (manufactured by Anton Paar GmbH, product name "MCR301")

[0333] Temperature: 25 °C

[0334] Geometry (upper side): Parallel plate made of aluminum with a diameter of 8 mm φ

[0335] Plate (lower side): Non-alkali glass plate with a diameter of 38 mm φ

[0336] Shear rate: 1 min -1

[0337] Spacing: 0.05 mm

[0338] Sample amount: 20 mg

[0339] Atmosphere: Nitrogen gas flow (1000 mL / minute)

[0340] [Liquid specific gravity]

[0341] The liquid specific gravity of the sealants in the examples and comparative examples was measured using a 5 mL Gay-Lussac type specific gravity bottle in accordance with 8.2.2 of JIS-K-0061.

[0342] [Static surface tension]

[0343] The static surface tension of the sealants in the examples and comparative examples was measured by the sessile drop method using a contact angle meter (DM500 manufactured by Kyowa Interface Science Co., Ltd.) in an atmosphere at 23 °C.

[0344] [Evaluation of coatability]

[0345] 10 μL of the sealant was dropped onto a 25 mm square color filter, irradiated with UV of 600 mJ / cm 2 using a high-pressure mercury lamp, left to stand for 10 minutes, then a non-alkali glass plate was attached, a 1 kg weight was placed, and left to stand for 1 minute. After standing, the area where the sealant spread was calculated using image calculation software.

[0346] The coatability was evaluated according to the following criteria.

[0347] A (Very good): The area where the sealant spreads is 625 mm 2

[0348] B (Good): The area where the sealant spreads is 300 mm 2 or more and less than 625 mm 2

[0349] C (Poor): The area where the sealant spreads is less than 300 mm 2

[0350] [Evaluation of transparency]

[0351] On a 50 mm square color filter, the sealant was coated at equal intervals so that the total amount became 0.024 g, and UV of 600 mJ / cm 2 was irradiated using a high-pressure mercury lamp. After standing for 10 minutes, a non-alkali glass plate was adhered, and vacuum pressing was performed at 0.05 kN. After pressing, the state of the bubbles between the droplets was confirmed.

[0352] The transparency was evaluated according to the following criteria.

[0353] A (Very good): No bubbles

[0354] B (Good): There are bubbles

[0355] C (Poor): The droplets do not touch each other and exist in a circular shape at the coated positions

[0356] [Table 1]

[0357]

[0358] This application claims priority based on Japanese Patent Application No. 2022-177417 filed on November 4, 2022, and incorporates the entire contents disclosed therein into this case.

Claims

1. A sealant, which comprises a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X), wherein, In the viscosity measurement conducted under the following measurement condition 1, the viscosity 20 seconds after the start of the measurement is set as V0. 30 seconds after the start of the measurement, ultraviolet rays with a wavelength of 365 nm and 30 mW / cm 2 are perpendicularly irradiated onto the non-alkali glass plate from a location 15 cm away from the non-alkali glass plate for 20 seconds, with a total of 600 mJ / cm 2 . When the viscosity 60 seconds after the end of the ultraviolet irradiation is set as V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.

75. Measurement condition 1: Apparatus: Rheometer Temperature: 25 °C Upper side of geometry: Parallel plates made of aluminum with a diameter of 8 mm φ Lower side of the plate: Soda-lime glass plate with a diameter of 38 mm φ Shearing speed: 1 min -1 Spacing: 0.05 mm Sample amount: 20 mg Atmosphere: Nitrogen gas flow.

2. The sealant according to claim 1, wherein, The viscosity V0 is 1 mPa·s or more and 1000 mPa·s or less.

3. The sealant according to claim 1 or 2, wherein, The viscosity V1 is 1 mPa·s or more and 2000 mPa·s or less.

4. The sealant according to claim 1 or 2, wherein, The cationically polymerizable compound (A) contains an epoxy group.

5. The sealant according to claim 4, wherein, The cationically polymerizable compound (A) contains one or more selected from the group consisting of an alicyclic compound (A-1) having an epoxy group, an aromatic compound (A-2) having an epoxy group, and a glycidyl ether compound (A-3).

6. The sealant according to claim 1 or 2, wherein, The cationically polymerizable compound (A) contains a bromine atom.

7. The sealant according to claim 1 or 2, wherein, In the viscosity measurement carried out under the measurement condition 1, the viscosity V2 10 minutes after the end of the ultraviolet irradiation is 5000 mPa·s or less.

8. The sealant according to claim 1 or 2, wherein, The liquid specific gravity in an atmosphere of 25 °C is 1.10 or more.

9. The sealant according to claim 1 or 2, wherein, The static surface tension obtained by the sessile drop method is 50 mN / m or less.

10. The sealant according to claim 1 or 2, wherein, The cationic polymerization initiator (B) contains one or more selected from the group consisting of a photo cationic polymerization initiator (B1) and a thermal cationic polymerization initiator (B2).

11. The sealant according to claim 10, wherein, The cationic polymerization initiator (B) contains an onium salt compound.

12. The sealant according to claim 1 or 2, wherein, The content of the cationic polymerization initiator (B) is 0.01 part by mass or more and 5.0 parts by mass or less with respect to 100 parts by mass of the cationically polymerizable compound (A).

13. The sealant according to claim 1 or 2, wherein, The curing retarder (X) contains one or more selected from the group consisting of a phosphoric acid-based curing retarder, an ether-based curing retarder, a thioether-based curing retarder, a metal complex-based curing retarder, and a nitroxide radical-based curing retarder.

14. The sealant according to claim 1 or 2, wherein, The content of the curing retarder (X) is 0.10 part by mass or more and 10.0 parts by mass or less with respect to 100 parts by mass of the cationically polymerizable compound (A).

15. The sealant according to claim 1 or 2, which is used for light-emitting diode elements.

16. The sealant according to claim 1 or 2, which is used for bonding a color filter and an organic electroluminescent display element or for bonding a color filter and a micro-LED.

17. The sealant according to claim 1 or 2, which can be used for sealing a solar cell unit.

18. The sealant according to claim 17, wherein, The solar cell unit includes a perovskite solar cell unit.

19. A cured body, which is formed by curing the sealant according to claim 1 or 2.

20. A display device, comprising: A light-emitting diode element; a substrate; and a cured sealant layer formed by the cured body according to claim 19, which is located between the light-emitting diode element and the substrate.

21. The display device according to claim 20, wherein, The light emitting diode element includes an organic electroluminescent display element or a micro LED.

22. The display device according to claim 20, wherein, The substrate includes a color filter.

23. A method for manufacturing a display device, comprising: Coating step, coating the sealant according to claim 1 or 2 on the first component; Irradiation step, irradiating light on the coated sealant; And Bonding step, bonding the first component and the second component via the sealant irradiated with light.

24. The method for manufacturing a display device according to claim 23, wherein, One of the first component and the second component is a substrate, and the other is a light emitting diode element.

25. The method for manufacturing a display device according to claim 24, wherein, The light emitting diode element includes an organic electroluminescent display element or a micro LED.

26. The method for manufacturing a display device according to claim 24, wherein, The substrate includes a color filter.

27. A solar cell, comprising: A solar cell unit; a substrate; and a cured sealing layer containing the cured product described in claim 19 and located between the solar cell unit and the substrate.

28. The solar cell according to claim 27, wherein, The solar cell unit includes a perovskite solar cell unit.

29. A composition comprising a cationically polymerizable compound (A), a cationic polymerization initiator (B), and a curing retarder (X), wherein, In the viscosity measurement conducted under the following measurement condition 1, the viscosity 20 seconds after the start of the measurement is set as V0. 30 seconds after the start of the measurement, ultraviolet rays with a wavelength of 365 nm and 30 mW / cm 2 are perpendicularly irradiated from a point 15 cm away from the non-alkali glass plate towards the non-alkali glass plate for 20 seconds, totaling 600 mJ / cm 2 . When the viscosity 60 seconds after the end of the ultraviolet irradiation is set as V1, the viscosity change rate represented by V1 / V0 is 1.00 or more and less than 1.75, Measurement condition 1: Apparatus: Rheometer Temperature: 25 °C Upper side of geometry: Parallel plates made of aluminum with a diameter of 8 mm φ, lower side of the plate: Soda-lime glass plate with a diameter of 38 mm φ Shearing speed: 1 min -1 Spacing: 0.05 mm Sample amount: 20 mg Atmosphere: Nitrogen gas flow.

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