JPH0491186A - Paste for el element - Google Patents

Abstract

PURPOSE:To provide the title paste of high viscosity, resistant to the oxygen in the atmosphere, quick in curing rate, capable of giving electrical insulating layers and luminescent layers of each desired thickness, consisting mainly of fluophor powder for electroluminescence and a radiation-curable specific polyol. CONSTITUTION:The objective paste easy to form the luminescent layers and electrical insulating layers for dispersion-type EL element, thus leading to shortening EL element production time, consisting mainly of (A) fluophor powder for electroluminescence and (B) a radiation-curable >=4C polyol having each at least one cyanoethyl and (meth)acryloyl groups (e.g. monosaccharide such as erythritol, oligosaccharide such as succharose).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a phosphor paste for forming a light emitting layer of an electroluminescent device and a high dielectric paste for forming an insulator layer.

[Prior Art] Dispersed electroluminescence (EL) elements generally use a metal foil such as aluminum foil as a back electrode, and on this back electrode, inorganic high dielectric powder such as titanium oxide or titanium barium is coated with an organic dielectric binder. A reflective insulator layer is formed by applying and solidifying a high dielectric paste dispersed in the organic dielectric binder, and then a phosphor paste made by dispersing phosphor powder such as zinc sulfide in an organic dielectric binder is applied and solidified on top of that. By this, a light emitting layer is formed, and finally ITO (l
It has a structure in which a transparent N electrode such as a mixture of indium oxide and tin oxide is installed as a counter electrode, and the phosphor emits light by applying an alternating current voltage between the two electrodes.

Note that a dispersion type EL element in which only a light emitting layer is sandwiched between a back electrode and a transparent electrode is also used.

Conventionally, in the manufacture of such dispersion type EL elements, solvent-dried pastes or thermosetting pastes have been used as these pastes, both of which are of the type that harden with heat.

However, these solvent-drying pastes or thermosetting pastes require approximately 1 to 2 hours to harden, and require a coating and drying process or a coating and curing process in order to obtain an insulating layer or a luminescent layer of a predetermined thickness. Since the process may be repeated several times, it has been desired to shorten the solidification process.

In response, high dielectric pastes or phosphor pastes that can be cured by radiation have been developed, making it possible to shorten the solidification process. (Unexamined Japanese Patent Publication No. 1-200595)
. JP-A-1-200595 discloses a high dielectric paste or a phosphor paste that can be cured by radiation, and the binder thereof includes, for example, a (meth)acrylic acid ester derivative having a cyanoalkyl group, or a cyanoalkoxyalkyl group. (Meth)acrylic acid ester derivatives or (meth)acrylic acid amide derivatives having a cyanoalkyl group are also disclosed.

[Problems to be Solved by the Invention] However, the compound specifically disclosed in JP-A-1-200595 is a low molecular weight compound obtained by cyanoalkylating and (meth)acrylic Oylation of a polyol having 3 or less carbon atoms. However, such compounds have several problems such as relatively slow solidification rate (polymerization rate). A possible reason for the slow polymerization rate is that low-molecular compounds have low viscosity and are therefore easily affected by oxygen in the air, which tends to inhibit curing. Furthermore, when high-molecular-weight acrylates (oligomers) are mixed with low-molecular-weight acrylates to increase the curing speed, as is conventionally done, the dielectric constant of the cured product decreases because the oligomer has a low dielectric constant. However, there have been problems such as reduction in brightness of EL elements using these high dielectric pastes or phosphor pastes. The present invention improves upon the drawbacks of the prior art described above.

[Means for Solving the Problems] The present invention provides a phosphor powder for EL, which can be solidified by radiation, and has at least one cyanoethyl group and at least one acryloyl or methacryloyl group, and has a carbon number of 4 or more. A phosphor paste for forming a light-emitting layer of a dispersed EL device, which is characterized by containing a polyol as a main component, and which can be solidified with inorganic dielectric powder and radiation, and has at least one cyanoethyl group and at least 111 or more cyanoethyl groups. The present invention provides a high dielectric paste for forming an insulator layer of a dispersed type El element, which is characterized by containing as a main component a polyol having 4 or more carbon atoms and having an acryloyl or methacryloyl group.

Generally used phosphor powder for EL can be used, for example, zinc sulfide powder added with an activator such as copper or manganese, or a co-activator such as chlor, bromine, or aluminum. things are used. The amount of the phosphor powder is preferably 50 to 90 parts by weight per 100 parts by weight of the paste.

A polyol having 4 or more carbon atoms (hereinafter referred to as cyanoethylated, (meth)acryloylated polyol) that can be solidified by radiation as a binder for a phosphor paste and has at least one cyanoethyl group and at least one (meth)acryloyl group. A feature of the present invention is the use of Polyols without cyanoethyl groups have a low dielectric constant, and E
The brightness of the L element decreases. Furthermore, polyols that do not have (meth)acryloyl groups cannot be solidified by release fi11. The (meth)acryloyl group here indicates a methacryloyl group or an acryloyl group. The cyanoethylated and (meth)acryloylated polyols of the present invention are rapidly solidified by radiation, but the dielectric constant of the solidifying machine is 10 or more (25°C
, IKH2) is preferred.

In the present invention, the polyol has 4 or more carbon atoms, preferably 6 carbon atoms.
Those having relatively high molecular weights are used.

Such polyols having 4 or more carbon atoms include 4 to 6 carbon atoms.
0 polyhydric alcohol and a hydroxyl group-containing natural polymer, a hydroxyl group-containing chemically modified polymer, or a hydroxyl group-containing synthetic polymer having 61 or more carbon atoms are preferred. Polyhydric alcohols having 4 to 60 carbon atoms include monosaccharides and oligosaccharides (one molecule per molecule) having 4 to 60 carbon atoms.
11,600) is exemplified. Monosaccharides used include chain sugar alcohols such as erythritol, xylitol, sorbitol, mannitol, and galactitol, cyclic sugar alcohols such as inositol, and cyclic reducing sugar acetals such as methyl glucoside and methyl mannoside. Disaccharides such as toll,
Contains 3-10 saccharides such as α, β, and γ-cyclodextrin. Examples of hydroxyl group-containing natural polymers having 61 or more carbon atoms include starch, cellulose, pullulan, and dextran whose constituent sugar is glucose.

Guar gum, whose constituent sugars are mannose and galactose,
Polysaccharides (more than 11,600 molecules) such as tara gum are exemplified. Examples of chemically modified natural polymers containing hydroxyl groups include polymers obtained by chemically modifying natural polysaccharides such as hydroxyethyl cellulose and dihydroxyethyl starch. Examples of synthetic polymers containing hydroxyl groups include polyvinyl alcohol (poval) and ethylene-vinyl acetate copolymer. Saponified products (EVAL) and the like are preferably used.

The number of cyanoethyl groups and (meth)acryloyl groups may be one or more, and the substitution ratio (the value obtained by dividing the number of moles of cyanoethylated or (meth)acryloylated hydroxyl groups by the number of moles of all hydroxyl groups) can be arbitrarily selected. It will be done. It may also be a mixture of polyols having various conversion ratios of cyanoethyl groups and (meth)acryloyl groups. Furthermore, cyanoethylated (meth)acrylated polyol may be used alone, but if the viscosity is too high (for example, when the polyol is a polymer and solid), it may be used as long as it does not inhibit the curing speed from the viewpoint of workability. Other late 1iFII! For example, 2- and droxyethyl acrylate may be mixed with a low-molecular compound that can be solidified with.

In particular, it is preferable to mix with a polyol having 3 or less carbon atoms that can be solidified by radiation and has at least one cyanoethyl group and at least one (meth)acryloyl group, from the viewpoint of improving workability and dielectric constant. . Examples of such polyols having 3 or less carbon atoms include 2-2-
Examples include (cyanoethoxy)ethyl acrylate, N,N-bis(2-cyanoethyl)acrylamide, 3-cyanopropyl acrylate, diethylene glycol monomethacrylate, and the like. It is desirable that such polyols having 3 or less carbon atoms be mixed in an amount of 80% or less.

Of course, the cyanoethylated and (meth)acryloylated polyols of the present invention also include mixtures, such as cyanoethylated (meth)acryloylated polymeric polyols (having 60 or more carbon atoms) and cyanoethylated.

(meth)acryloyl low molecular weight polyol (carbon number 4~
60) may also be used.

A cyanoethylated (meth)acryloylated polyol is generally obtained by (meth)acryloylating a cyanoethylated polyol obtained by cyanoethylating a polyol. Cyanoethylation of a polyol is easily carried out by Michael addition of 7-crylonitrile in an amount equal to or less than the hydroxyl group to the hydroxyl group contained in the polyol. Further, (meth)acryloylation of a cyanoethylated polyol can be obtained by reacting (meth)acryloyl chloride in the presence of triethylamine, pyridine, etc. in a solvent such as dichloromethane, chloroform, or acetonitrile.

Incidentally, the cyanoethylation substitution rate was calculated from the measurement of the residual water m group value using a conventional acetic anhydride-pyridine method. In addition, the (meth)acryloylation substitution rate is 'HN
Calculated from the MR proton ratio (664 to 5.5 ppm).

In the cyanoethylated (meth)acryloylated polyol, hydroxyl groups may remain after the reaction, or all hydroxyl groups may be cyanoethylated or (meth)acryloylated.

The cyanoethylation substitution rate is preferably 10 to 90%, and the (meth)acryloylation substitution rate is 80% or less, particularly 10 to 5.
0% is preferred.

As the inorganic high dielectric powder for the high dielectric paste, conventionally used inorganic high dielectric powders can be used, but for example, barium titanate, lead titanate, strontium titanate, etc. are preferably used.

Inorganic high dielectric powder is paste 5 in 100111all
It is preferably 0 to 901 parts by weight.

The polyol having 4 or more carbon atoms and having at least one radiation-curable cyanoethyl group and at least one (meth)acryloyl group used as a binder is the same as that used in the phosphor paste. .

In the case of the high dielectric paste, as in the case of the phosphor paste, the cyanoethylated (meth)acryloylated polyol may be used alone or may be mixed with other compounds that can be solidified by radiation. In particular, from the viewpoint of workability and dielectric constant, it is preferable to mix with a polyol having 3 or less carbon atoms that can be solidified by radiation and has at least one cyanoethyl group and at least one acryloyl or methacryloyl group.

Both the phosphor paste and the I&dielectric paste may contain an organic high dielectric material to increase the dielectric constant, if necessary. Such organic high dielectric materials have a dielectric constant of 10 or more (
IKH2, 25°C) are preferred, and cyanoethylated ethylene vinyl alcohol copolymers and cyanoethylated polyvinyl alcohols.

Cyanoethylated dihydroxypoval, cyanoethylated cellulose, cyanoethylated hydroxyalkylcellulose, cyanoethylated hydroxyethylcellulose, cyanoethylated pullulan, etc. are used.

These pastes can also contain spacers, photosensitizers, and the like.

Examples of spacers include epoxy resin, polystyrene, nylon, glass, etc. with a particle size of 10 to 50111.

Typical examples of photosensitizers include benzoin isopropyl ether, 1-hydroxy-cyclohexyl-phenyl ketone (manufactured by Ciba Geigy; trade name: Irgacure 184), 2-hydroxy-2-methyl-1-phenylpropane. -1-one (manufactured by Merck & Co., trade name: Darocure 1173), benzyl dimethyl ketal (manufactured by Ciba-Geigy; trade name: Irgacure 651), and the like.

The amount of photosensitizer added is usually 0.5 to 0.5 to 0.5 to 1,000 yen per polyol having a cyanoethyl group or (meth)acryloyl group.
It is preferable to add 5% by weight.

The radiation referred to in the present invention includes electron beams and ultraviolet rays, and these may be irradiated alone or in the order of ultraviolet rays and electron beams.

Furthermore, although the phosphor paste and high dielectric paste of the present invention are pastes that can be solidified by radiation at t1411, they can also be solidified by heating by adding peroxide.

The dispersion type EL element using the phosphor paste and high dielectric paste of the present invention can be prepared by a known method, for example, JP-A-1-2005.
No. 95. For example, a high dielectric paste is applied to a back electrode that has been subjected to a terminal extraction process, and is solidified by radiation irradiation from a coating machine to form an insulating layer.

Next, a phosphor paste was applied onto the insulating layer, and a transparent electrode, which had been subjected to a terminal extraction process in advance, was crimped onto the paste layer. Next, the laminate is irradiated with radiation from the transparent electrode side to solidify and form a light emitting layer.

After solidification, a synthetic resin film such as nylon is applied with the external lead wires drawn out, and the entire structure is then covered with a fluororesin film.

The thus obtained distributed EL element can exhibit a high temperature of 11 degrees by applying an AC voltage or a DC voltage to its terminals.

Furthermore, if necessary, the phosphor paste and high dielectric paste of the present invention may be combined with conventional heat-curing type (solvent drying type or thermosetting type) phosphor paste and high dielectric base.
L elements can also be manufactured. For example, it may be a combination of the phosphor paste of the present invention and a thermosetting high dielectric paste, or a combination of the high iR electric paste of the present invention and a thermosetting phosphor paste. Moreover, it is also possible to add an organic solvent for use if necessary.

[Effects] The phosphor paste and high dielectric paste of the present invention can be solidified by radiation, and contain a polyol having 4 or more carbon atoms and having at least one cyanoethyl group and at least one (meth)acryloyl group. Since a binder is used as the main component, the viscosity of the paste is relatively high and it is not easily affected by oxygen in the air, and the curing speed is fast, making it easy to form the light emitting layer and insulating layer of dispersed EL devices. The time for manufacturing EL elements can be shortened. In addition, there is no risk of fire, explosion, or solvent content due to the use of solvents, and the desired Il! !
The insulator layer and light emitting layer of i can be easily obtained.

Furthermore, since it has a cyanoethyl group, it has a high dielectric constant.

In particular, it can be used in combination with a cyanoethylated acryloyl polyol having a carbon number of 3 or less, which has a slow curing speed, and a paste with a fast curing speed and high dielectric constant can be obtained, and the brightness can be further improved.

Hereinafter, the present invention will be specifically explained using Examples, but the present invention is not limited to the Examples unless it exceeds the gist thereof.

[Synthesis Example 1] 30 g of sorbitol (a monosaccharide with 6 carbon atoms) and 1 portion of water were placed in a 300 d three-meter flask equipped with a stirrer, a cooler, and a thermostat.
5 g and 2.2 g of 30% NaOH were added and stirred. Here, dichloromethane 305F, acrylonitrile 429
was added and reacted at 50°C for 4 hours. The reaction solution was returned to room temperature, 90 d of chloroform was added, and the mixture was washed twice with 100 M1 of water. The extract was dried with magnesium sulfate and concentrated.
Cyanoethylated sorbitol (cyanoethylation rate 83%)
) 29.1g was obtained.

Cyanoethylated sorbitol obtained above 17.19
, dichloromethane 1007, triethylamine 12.9
The reaction solution consisting of m was cooled to 5°C, and while stirring, acryloyl chloride 7.557 was added in dichloromethane (100
1i) The solution was added dropwise over 2 hours. The reaction solution was heated to room temperature, 5% sodium bicarbonate solution was added, and the mixture was stirred for 2 hours. The dichloromethane layer was separated, washed twice with saturated saline, and the extract was dried over magnesium sulfate and concentrated to yield cyanoethylated acryloylated sorbitol (acryloylation rate 17%) 7
．． 11 g+ was obtained.

[Synthesis Example 2] Cyanoethylated pullulan (Shin-Etsu Chemical, Sialdin CR-
8. Cyanoethylation rate: 85%) 26.89 d, acetonitrile 200 d, and triethylamine 14.1 d were charged into a 500ae Mitsuro flask equipped with a stirrer, thermometer, and dropping funnel, and cooled to 0°C. A solution of 8.23 d of acryloyl chloride in acetonitrile (60 gm+) was added dropwise thereto over 2 hours while stirring. The reaction solution was returned to temperature V and added dropwise into 3 g of water with vigorous stirring. The precipitate was taken out, dissolved in a small amount of acetone, and dropped into 3 parts of water with vigorous stirring. The precipitate was dried to obtain cyanoethylated acryloylated pullulan. (Acryloyl conversion rate 15%).

[Synthesis Examples 3 to 7] The compounds listed in Table 1 were synthesized in the same manner as in Synthesis Example 1 or 2.

[Reference Example] 2 g of a photoinitiator (manufactured by Ciba Geigy: Irugagi J, A184) was added to 100 g of the cyanoethylated acryloylated polyols of Synthesis Examples 1 to 7, and stirred.

The mixture was then degassed, poured into a dish of 1 MIj and irradiated under a metal halide lamp with an output of 80 W/rx at 10 α until the surface was no longer sticky.

Table 1 shows the dielectric constant (25°C, IKHz) after curing 1°, and Table 2 shows the time of irradiation until the stickiness disappeared (open during curing).

In Synthesis Example 2.6.7, cyanoethylated acry[]ylated dalurane, poval, and eval were each measured by mixing and heating and dissolving 2-(2-cyanoeth4-cy)ethyl acrylate in 50/5O.

It can be seen that the curing speed is extremely fast compared to the comparative example 2-(2-cyanoethoxy)ethyl acrylate.

Further, when 2-(2-cyanoethoxy)ethyl acrylate is mixed with neopentyl acrylate having no cyano group, the curing speed is increased, but the dielectric constant is lowered.

[Example 1] Phosphor powder for electroluminescence (TV manufactured by GTE)
I) e723) 360g of cyanoethylated acryloylated xylitol 509 and 2-(2~cyanoethoxy)
Mix with 50g of ethyl acrylate and disperse well, then add 2g of photosensitizer (Merck; Darocure-1173).
Addition L7, stirring and mixing, followed by defoaming.

1 g of epoxy beads were dispersed in this suspension as a spacer to produce a phosphor paste for forming a light emitting layer of a dispersed electroluminescent device.

[Example 2 Phosphor powder for co-electroluminescence (manufactured by GTE,
Type 723) 360g was mixed with 50g of cyanoethylated acryloylated sorbitol and 50g of 2-(2-cyanoethoxy)ethyl acrylate and dispersed well, and further added 20g of photosensitizer (Merck: Darocure-1173).
g was added, stirred and mixed, and then defoamed. In this suspension, 1 g of epoxy beads were dispersed as spacers to produce a phosphor paste for forming a light emitting layer of a dispersed electroluminescent device.

[Example 3] Phosphor powder for electroluminescence (GTE %:
TVI) e723) 3609 was mixed with 50 g of cyanoethylated acryloylated saccharose and 50 g of 2-(2-cyanoethoxy)ethyl acrylate and dispersed well, and then a photosensitizer (manufactured by Merck & Co., Ltd.; Darocure-1173) was added.
2g of was added, stirred and mixed, and then defoamed. In this suspension, 1 g of epoxy beads were dispersed as spacers to produce a phosphor paste for forming a light emitting layer of a dispersed electroluminescent device.

Example 4] 200 g of barium titanate powder was mixed with 50 g of cyanoethylated acryloylated xylitol and 50 g of 2-(2-cyanoethoxy)ethyl acrylate, well dispersed, and a photosensitizer (manufactured by Merck & Co., Ltd.; Darocure 1173) was added. )
A high dielectric paste for forming an insulator layer of a dispersed electroluminescent device was produced by mixing and stirring 2 g of the mixture, followed by defoaming.

[Example 5] Barium titanate powder 2009 was mixed with 50 g of cyanoethylated acryloylated sorbitol and 2-(2-cyanoethoxy)ethyl acrylate 509, and dispersed well. )
2 g of the mixture was mixed and stirred, followed by degassing to produce an island dielectric paste for forming an insulator layer of a dispersed EL device.

[Example 6] Barium titanate powder 2009 was mixed with 50 g of cyanoethylated acryloylated saccharose and 50 g of 2-(2-cyanoethoxy)ethyl acrylate, well dispersed, and a photosensitizer (manufactured by Merck & Co., Ltd.; Darocure 1173) was added. A high dielectric paste for forming an insulator layer of a dispersed EL element was produced by mixing and stirring 2 g of the mixture and then degassing it.

An example of manufacturing an EL element is shown below.

[Examples 7 to 9] Insulator paste [Example 4] was screen printed,
The binder was applied to the back electrode of an aluminum plate having a thickness of 100 microns, and was irradiated with ultraviolet rays from a 4KW metal halide lamp for 5 seconds to solidify the binder and form an insulating layer. This thickness was 30 microns. Subsequently, a phosphor paste [Example 1] was applied onto the insulator layer by screen printing, and then ITO was deposited on one side to a thickness of 75411.
A transparent conductive film with lead terminals attached is attached so as not to contain air, and then ultraviolet rays are irradiated from the transparent electrode side for 5 seconds using a 4KW metal halide lamp to solidify the binder and form a 40-thick phosphor. formed into layers. A lead terminal was attached to the back electrode, nylon films for water capture were laminated on both the front and back surfaces, and the whole was sealed with a fluorine film to obtain an EL element. (Example 7)
.

An EL device was manufactured using the phosphor paste of Example 2 and the high dielectric paste of Example 4 in the same manner as in Example 7 (Example 8). Furthermore, an EL device was manufactured in the same manner using the phosphor paste of Example 3 and the dielectric paste of Example 6 (Example 9). 1 for each EL element of Examples 7 to 9
00V.

The results shown in Table 3 were obtained by applying an AC voltage of 400H2.

Table 3 [Example 10] A composition of 150 g of cyanoethylated acryloylated xylitol, 360 grams of phosphor (Tle723), and 1 g of Irgacure 651 21-treated poxy beads was used as the phosphor paste, and cyanoethylated acryloylated xylitol 1509, as the insulating paste. barium titanate 3
An EL device was obtained in the same manner as in Example 7 except that a composition of 00g and Irgacure 651 29 was used. however,
This paste was applied using an applicator, and the thickness of each layer was 50 Im.

The insulation layer was 30cm thick. 100V to this El element
.

An alternating current voltage of 400H2 was applied. The brightness was 90 Cd/foot.

[Example 11] A composition of 100 g of cyanoethylated acryloylated sucrose, 1 g of Calpitol acrylate, and Irgacure 184 25F was used as the phosphor paste, and 100 g of cyanoethylated acryloylated saccharose, 5 Calpitol acrylate as the insulator paste.
0g, barium titanate 3004? , epoxy beads 1
An EL device was obtained in the same manner as in Example 7 except that 2 g of Irgacure 184 was used.

The thickness of each layer was 55 cm for the light emitting layer and 11 30 cm for the insulator/Jl.

(7) EL element 1. ;: 100V, 400H
z (7) AC voltage was applied. Brightness is 75cd/r
It was d.

[Example 12] 20 g of cyanoethylated acryloylated pullulan as a phosphor paste. Cyanoethylated xylitol 80g. Phosphor (Type 723) 200g, Irgacure 1
84 Using a composition of 1 g of 21st poxy beads, 20 g of cyanoethylated acryloylated pullulan and 80 g of cyanoethylated xylitol were used as an insulating paste. An EL device was obtained in the same manner as in Example 7 except that the compositions of barium titanate powder 2009 and Irgacure 184 29 were used. However, an applicator was used for application. The thickness of each layer is the luminescent layer 50-, the insulator li! It was 30-. An alternating current voltage of 100 V and 400 Hz was applied to this EL element. The brightness was 110 Cd/'rd.

Claims (8)

[Claims] (1) The main components are a phosphor powder for electroluminescence and a polyol having 4 or more carbon atoms that can be solidified by radiation and has at least one cyanoethyl group and at least one acryloyl or methacryloyl group. A phosphor paste for forming a light-emitting layer of a dispersed electroluminescent device. (2) The phosphor paste according to claim 1, wherein the polyol having 4 or more carbon atoms is a monosaccharide or an oligosaccharide. (3) The phosphor paste according to claim (1), wherein the polyol having 4 or more carbon atoms is a hydroxyl group-containing natural polymer, a hydroxyl group-containing chemically modified polymer, or a hydroxyl group-containing synthetic polymer. (4) A phosphor powder for electroluminescence, which can be solidified by radiation, and a polyol having 4 or more carbon atoms, which has at least one cyanoethyl group and at least one acryloyl or methacryloyl group, and which can be solidified by radiation. A light-emitting layer of a dispersed electroluminescent device, characterized in that the main component is a mixture of a polyol having 3 or less carbon atoms and having at least one cyanoethyl group and at least one acryloyl or methacryloyl group. Phosphor paste for formation. (5) The main component is an inorganic high dielectric powder and a polyol having 4 or more carbon atoms that can be solidified by radiation and has at least one cyanoethyl group and at least one acryloyl or methacryloyl group. A high dielectric paste for forming an insulator layer of a dispersed electroluminescent device. (6) The high dielectric paste according to claim (4), wherein the polyol having 4 or more carbon atoms is a monosaccharide or an oligosaccharide. (7) The high dielectric paste according to claim (4), wherein the polyol having 4 or more carbon atoms is a hydroxyl group-containing natural polymer, a hydroxyl group-containing chemically modified polymer, or a hydroxyl group-containing synthetic polymer. (8) can be solidified by radiation with an inorganic high dielectric powder, and can be solidified by radiation with a polyol having 4 or more carbon atoms having at least one cyanoethyl group and at least one acryloyl or methacryloyl group, and A polymer for forming an insulator layer of a dispersed electroluminescent device, characterized in that the main component is a mixture of a polyol having 3 or less carbon atoms and having at least one cyanoethyl group and at least one acryloyl or methacryloyl group. dielectric paste.