JP2010116441A - Conductive composition for capacitor electrode - Google Patents

Abstract

【Task】
In view of application to capacitors and the like, an object is to provide a conductive composition capable of forming a conductor with improved heat resistance.
If the conductive composition for capacitor electrodes of the present invention is used, a capacitor having excellent heat resistance can be obtained.
[Solution]
A conductive composition for a capacitor electrode, comprising a water-soluble conductive polymer (A) having a sulfonic acid group and / or a carboxy group, a basic compound (B), and a solvent (C). Component (B) may be contained in the conductive composition by remaining the monomer used as the raw material of component (A), such as acidic group-substituted aniline, in the oxidative polymerization in solution. In addition, a basic compound of the same kind or different kind may be added to the conductive composition. In terms of heat resistance, in addition to the component (B) used in the polymerization of the component (A), it is preferable to add the same or different basic compound to the conductive composition.

[Selection] Figure 1

Description

  The present invention relates to a conductive composition for capacitor electrodes.

  As a conductive polymer, doped polyaniline is well known. As its production method, a method of polymerizing an acidic group-substituted aniline such as sulfonic acid group-substituted aniline or carboxy group-substituted aniline in a solution containing a basic compound (for example, Patent Documents 1 and 2) has been proposed. These methods have the advantage that a high molecular weight polymer can be produced, contrary to the conventional theory that anilines having a sulfonic acid group or a carboxy group are difficult to polymerize by themselves and it is difficult to obtain a high molecular weight polymer. . Moreover, the conductive polymer obtained by this method exhibits excellent dissolution in any acidic to alkaline aqueous solution.

  However, this method does not completely suppress side reactions and by-product formation of oligomer components that are thought to be based on this, and this impedes the introduction of impurities into the conductive polymer and the improvement in conductivity. ing. Further, there is a problem that the impurity removal process becomes complicated due to the mixing of impurities.

In order to solve these problems, when an acidic group-substituted aniline is polymerized in a solution containing a basic compound, a solution containing the acidic group-substituted aniline and the basic compound in a solution of an oxidizing agent as a polymerization catalyst. There has been proposed a method capable of suppressing the generated impurities by dropping (see Patent Document 3). In this method, formation of oligomer components can be suppressed, and an acidic group-substituted aniline conductive polymer having high purity and high conductivity can be obtained.
JP-A-7-196791 JP 7-324132 A JP 2000-219739 A

  Although the conductive polymer obtained in the above method has practical conductivity, there is a problem that the conductivity is lowered when used in a high temperature atmosphere. Therefore, it is required to improve the property that the conductivity does not decrease even at a high temperature, that is, the heat resistance.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a conductive composition capable of forming a conductor having improved heat resistance, particularly considering application to a capacitor or the like.

  As a result of intensive studies, the inventors have added a basic compound contained in a conductive composition containing a conductive polymer having a sulfonic acid group and / or a carboxy group, so that the resulting conductor has a large heat resistance. As a result, the present invention has been completed.

That is, the present invention relates to a conductive composition for a capacitor electrode comprising a water-soluble conductive polymer (A) having a sulfonic acid group and / or a carboxy group, a basic compound (B), and a solvent (C).

  If the electrically conductive composition for capacitor electrodes of the present invention is used, a capacitor having excellent heat resistance can be obtained.

<Conductive composition>
The conductive composition used in the present invention comprises a water-soluble conductive polymer (A) having a sulfonic acid group and / or a carboxy group (hereinafter referred to as component (A)), a basic compound (B) (hereinafter referred to as component). (B)), and a solvent (C).
(Ingredient (A))
“Water-soluble” in component (A) means that it is uniformly dissolved in water at 25 ° C. by about 0.1 g or more.

The component (A) has a sulfonic acid group (—SO ₃ H) and / or a carboxy group (—COOH). In the component (A), each of the sulfonic acid group and the carboxy group may be contained in an acid state (—SO ₃ H, —COOH), or in an ionic state (—SO ₃ ^— , —COO ⁻ ). It may be included.

  The component (A) has at least one repeating unit selected from the group consisting of repeating units represented by the following general formulas (1) to (3) (hereinafter referred to as repeating unit (a1)). preferable.

In formula (1), R ^{1 to} R ² each independently represent —H, —SO ₃ ^— , —SO ₃ H, —R ¹¹ SO ₃ ^— , —R ¹¹ SO ₃ H, —OCH ₃ , —CH. ^{_{3, -C 2 H 5, -F}} , -Cl, -Br, -I, -N (R 12) 2, -NHCOR 12, -OH, -O -, -SR 12, -OR 12, -OCOR 12 , —NO ₂ , —COOH, —R ¹¹ COOH, —COOR ¹² , —COR ¹² , —CHO or —CN, wherein R ¹¹ is an alkylene group having 1 to 24 carbon atoms or an arylene group having 1 to 24 carbon atoms. or an aralkylene group having 1 to 24 carbon ^{atoms, R 12} is an alkyl group, an aralkyl group an aryl group or a 1 to 24 carbon atoms having 1 to 24 carbon atoms having 1 to 24 carbon atoms, ^{R 1} and ^{R 2} At least one of _the, ^-SO 3 _-, -S _{^{3 H, -R 11 SO 3 -}} , a _-R 11 SO 3 H, -COOH or ^-R 11 COOH.

In formula (2), R ^{3 to} R ⁶ each independently represent —H, —SO ₃ ^— , —SO ₃ H, —R ¹¹ SO ₃ ^— , —R ¹¹ SO ₃ H, —OCH ₃ , —CH. ^{_{3, -C 2 H 5, -F}} , -Cl, -Br, -I, -N (R 12) 2, -NHCOR 12, -OH, -O -, -SR 12, -OR 12, -OCOR 12 , —NO ₂ , —COOH, —R ¹¹ COOH, —COOR ¹² , —COR ¹² , —CHO or —CN, wherein R ¹¹ is an alkylene group having 1 to 24 carbon atoms or an arylene group having 1 to 24 carbon atoms. or an aralkylene group having 1 to 24 carbon ^{atoms, R 12} is an alkyl group, an aralkyl group an aryl group or a 1 to 24 carbon atoms having 1 to 24 carbon atoms having 1 to 24 carbon ^atoms, R 3 to R ⁶ At least one of _the, ^-SO 3 _-, ^{-SO H,} -R ₁₁ ^SO 3 ^-, a _-R 11 SO 3 H, -COOH or ^-R 11 COOH.

In formula (3), R ^{7 to} R ¹⁰ each independently represent —H, a linear or branched alkyl group having 1 to 24 carbon atoms, a linear or branched alkoxy group having 1 to 24 carbon atoms, or an acidic group. , Hydroxyl group, nitro group, -F, -Cl, -Br or -I, and at least one of R ^{7 to} R ¹⁰ is an acidic group.

Here, the “acidic group” represents a sulfonic acid group or a carboxy group. That is, in formula (3), at least one of R ^{7 to} R ¹⁰ is —SO ₃ ^— , —SO ₃ H, —COOH, or —COO ^— .

In terms of easy production, any one of R ^{7 to} R ¹⁰ is a linear or branched alkoxy group having 1 to 4 carbon atoms, and any one of them is —SO ₃ ^— or —SO ₃ H. And the remainder being H is preferred.

  In the component (A), the proportion of the repeating unit (a1) is preferably 20 to 100 mol%, more preferably 50 to 100 mol%, of all repeating units (100 mol%) constituting the component (A). 100 mol% is more preferable.

  The component (A) preferably has 10 or more repeating units (a1) in one molecule.

  5000-1 million are preferable and, as for the mass average molecular weight of a component (A), 5000-20000 are more preferable. When the mass average molecular weight of the component (A) is 5000 or more, the conductivity, film formability and film strength are excellent. If the mass average molecular weight of a component (A) is 1 million or less, it is excellent in the solubility to a solvent.

The mass average molecular weight of the component (A) is a mass average molecular weight (in terms of polyethylene glycol) measured by gel permeation chromatography (GPC).
(Ingredient (B))
Heat resistance improves by a component (B) being contained in the electrically conductive composition of this invention. The reason is considered that component (B) prevents decomposition of component (A). Component (B) includes inorganic bases such as sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide Organic hydroxides such as methylamine, ethylamine, propylamine, butylamine, primary alkylamines such as pentylamine, hexylamine, primary amines such as benzylamine and aniline, dimethylamine, diethylamine, dipropylamine, di Secondary alkylamines such as butylamine, dipentylamine, dihexylamine, secondary amines such as methylaniline, trimethylamine, triethylamine, tripropylamine, tributylamine, tripentylamine, trihexylamine Tertiary alkylamines such as dimethylaniline, tertiary amines such as dimethylaniline, alcohol amines such as 2-aminoethanol, diethanolamine, triethanolamine, α-picoline, β-picoline, γ-picoline, pyridine, pyreridine, etc. Examples include heterocyclic amine water, benzylamine, methoxyethylamine, aminopyridine, hydroxymethylpyridine, pyridinol, ethylenediamine, and ammonia. Of these, sodium hydroxide or ammonia is preferred. Any one of these amines may be used alone, or two or more thereof may be mixed and used.

Component (B) may be contained in the conductive composition by remaining the monomer used as the raw material of component (A), such as acidic group-substituted aniline, in the oxidative polymerization in solution. In addition, a basic compound of the same kind or different kind may be added to the conductive composition. In terms of heat resistance, in addition to the component (B) used in the polymerization of the component (A), it is preferable to add the same or different basic compound to the conductive composition.
(Solvent (C))
The solvent (C) is not particularly limited as long as it can dissolve the component (A) and the component (B), and examples thereof include water or a mixed solvent of water and a water-soluble organic solvent.

  When a mixed solvent is used, the mixing ratio of water and the water-soluble organic solvent is not particularly limited and is arbitrary, but usually a mixed solvent of water: water-soluble organic solvent = 1: 100 to 100: 1 is preferably used. It is done.

  The water-soluble organic solvent is not particularly limited as long as it is mixed with water. Specific examples of water-soluble organic solvents include water, alcohols such as methanol, ethanol, isopropanol, propanol, and butanol, ketones such as acetone and ethyl isobutyl ketone, and ethylene glycols such as ethylene glycol and ethylene glycol methyl ether. , Propylene glycols such as propylene glycol, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol butyl ether, propylene glycol propyl ether, amides such as dimethylformamide and dimethylacetamide, pyrrolidones such as N-methylpyrrolidone and N-ethylpyrrolidone And the like. Among these, alcohols, acetone, acetonitrile, dimethylformamide, dimethylacetamide and the like are preferable, and alcohols are particularly preferable. As alcohols, methanol, ethanol, isopropanol and the like are preferably used.

  As the solvent (C), water or a mixed solvent of water and alcohols is particularly preferable. Moreover, it is preferable that this mixed solvent contains 50 mass% or more of water.

  A known additive can be arbitrarily mixed in the conductive composition. As the additive, those that improve the coating property to a substrate, film-forming property, film-forming property, adhesion, etc. are preferable. For example, nonionic surfactants, anionic surfactants, cationic surfactants, Examples thereof include water-soluble polymers and emulsion polymers.

  In the conductive composition, for example, a monomer that is polymerized to give component (A) is polymerized (oxidative polymerization) using an oxidizing agent in the presence of component (B), and the resulting product is solvent (C ).

  For example, the water-soluble conductive polymer having a repeating unit represented by the general formula (3) can be obtained by polymerizing a compound (acid group-substituted aniline) represented by the following general formula (3a).

Wherein ^{(3a), R} 17 ~R ²⁰ are each independently, -H, a linear or branched alkyl group having 1 to 24 carbon atoms, straight-chain or branched alkoxy group having 1 to 24 carbon atoms, acidic groups , Hydroxyl group, nitro group, -F, -Cl, -Br or -I, and at least one of R ^{17 to} R ²⁰ is an acidic group. The acidic group is the same as the acidic group in the formula (3).

  Examples of the acidic group-substituted aniline include a sulfonic acid group-substituted aniline having a sulfonic acid group as an acidic group, and a carboxy group-substituted aniline having a carboxy group as an acidic group.

  A typical example of the sulfonic acid group-substituted aniline is an aminobenzenesulfonic acid derivative. Representative examples of the carboxy group-substituted aniline include aminobenzoic acid derivatives. Of these, aminobenzenesulfonic acid derivatives tend to have higher conductivity than aminobenzoic acid derivatives, while aminobenzoic acid derivatives tend to be more soluble than aminobenzenesulfonic acid derivatives. These derivatives can also be used by mixing at an arbitrary ratio according to the purpose.

  Examples of sulfone group-substituted anilines include o-, m- or p-aminobenzenesulfonic acid, aniline-2,6-disulfonic acid, aniline-2,5-disulfonic acid, aniline-3,5-disulfonic acid, and aniline-2. Aminobenzenesulfonic acids such as 1,4-disulfonic acid and aniline-3,4-disulfonic acid; methylaminobenzenesulfonic acid, ethylaminobenzenesulfonic acid, n-propylaminobenzenesulfonic acid, iso-propylaminobenzenesulfonic acid, n -Alkyl group-substituted aminobenzenesulfonic acids such as butylaminobenzenesulfonic acid, sec-butylaminobenzenesulfonic acid, t-butylaminobenzenesulfonic acid; methoxyaminobenzenesulfonic acid, ethoxyaminobenzenesulfonic acid, propoxyaminobenzenesulfone Alkoxy group-substituted aminobenzenesulfonic acids such as acids; Hydroxy group-substituted aminobenzenesulfonic acids; Nitro group-substituted aminobenzenesulfonic acids; Halogen-substituted aminobenzenes such as fluoroaminobenzenesulfonic acid, chloroaminobenzenesulfonic acid, and bromoaminobenzenesulfonic acid Sulfonic acids; and the like. Of these, aminobenzene sulfonic acids, alkyl group-substituted aminobenzene sulfonic acids, alkoxy group-substituted aminobenzene sulfonic acids, hydroxy group-substituted aminobenzene sulfonic acids and the like are preferred in practice. These sulfonic acid group-substituted anilines may be used alone or in a mixture of two or more at any ratio.

  Carboxy group-substituted anilines include o-, m- or p-aminobenzenecarboxylic acid, aniline-2,6-dicarboxylic acid, aniline-2,5-dicarboxylic acid, aniline-3,5-dicarboxylic acid, aniline-2. Aminobenzene carboxylic acids such as 1,4-dicarboxylic acid and aniline-3,4-dicarboxylic acid; methylaminobenzenecarboxylic acid, ethylaminobenzenecarboxylic acid, n-propylaminobenzenecarboxylic acid, iso-propylaminobenzenecarboxylic acid, n Alkyl group-substituted aminobenzene carboxylic acids such as butylaminobenzene carboxylic acid, sec-butylaminobenzene carboxylic acid, t-butylaminobenzene carboxylic acid; methoxyaminobenzene carboxylic acid, ethoxyaminobenzene carboxylic acid, propoxyaminobenzene carboxylic acid Alkoxy group-substituted aminobenzene carboxylic acids such as acids; Hydroxy group-substituted aminobenzene carboxylic acids; Nitro group-substituted aminobenzene carboxylic acids; Halogen group substitution such as fluoroaminobenzene carboxylic acid, chloroaminobenzene carboxylic acid, bromoaminobenzene carboxylic acid, etc. Aminobenzene carboxylic acids; and the like. Of these, aminobenzene carboxylic acids, alkyl group-substituted aminobenzene carboxylic acids, alkoxy group-substituted aminobenzene carboxylic acids, hydroxy group-substituted aminobenzene carboxylic acids and the like are preferred in practice. These carboxy group-substituted anilines may be used alone or in a mixture of two or more at any ratio.

  In the above oxidative polymerization, the amount of the component (B) used is preferably 0.5 to 3 mol, preferably 0.5 to 2 mol with respect to 1 mol of the monomer, in that the conductivity of the component (A) to be obtained is improved. Is more preferable.

  The oxidizing agent used for the oxidative polymerization is not particularly limited as long as the standard electrode potential is 0.6 V or more, but peroxodisulfuric acid such as peroxodisulfuric acid, ammonium peroxodisulfate, sodium peroxodisulfate and potassium peroxodisulfate. And hydrogen peroxide are preferably used. Any one of these oxidizing agents may be used alone, or two or more thereof may be used in combination.

  1-5 mol is preferable with respect to 1 mol of monomers, and, as for the usage-amount of an oxidizing agent, 1-3 mol is more preferable.

  More specifically, as a polymerization method, a method in which a monomer solution is dropped into an oxidant solution, a method in which an oxidant solution is dropped into a monomer solution, and a reaction in which an oxidant solution and a monomer solution are simultaneously dropped into another reactor. A method is mentioned.

  At this time, it is also effective to add a transition metal compound such as iron or copper as a catalyst.

The polymerization is preferably performed while stirring the inside of the polymerization system. Stirring is usually preferably performed at a stirring power of 0.01 to 5 kw / m ³ .

  The reaction temperature during polymerization is preferably 50 ° C. or lower, more preferably −15 to 50 ° C., and further preferably −10 to 40 ° C. If the reaction temperature exceeds 50 ° C., the conductivity may decrease due to the progress of side reactions or the change in the redox structure of the main chain. Moreover, if it is less than -15 degreeC, reaction time may become long.

  After polymerization, unreacted monomers are dissolved in the obtained reaction solution. Therefore, operation which isolate | separates a product from this reaction liquid is performed. As the separation device used at this time, vacuum filtration, pressure filtration, centrifugal separation, centrifugal filtration or the like is used, and it is particularly preferable to use a separation device such as centrifugal separation or centrifugal filtration because a high-purity one can be easily obtained. .

  After separation, the product obtained may be purified. Purification can be carried out using a washing solvent, which includes alcohols such as methanol, ethanol, iso-propanol, n-propanol, t-butanol, acetone, acetonitrile, N, N-dimethylformamide, N- Methyl pyrrolidone, dimethyl sulfoxide, and the like are preferable because high-purity ones can be obtained. In particular, methanol, ethanol, iso-propanol, acetone, and acetonitrile are effective.

  In the product obtained as described above, the component (A) and the component (B) are present in the form of a salt. Therefore, the electroconductive composition used for this invention is obtained by melt | dissolving this in a solvent (C).

    In the conductive composition, the content of the component (A) is preferably 0.5 to 10 parts by mass and more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the solvent (C). When the content is 0.5 parts by mass or more, sufficient conductivity is obtained, and when it is 10 parts by mass or less, the viscosity of the conductive composition can be prevented from becoming too high, and the handling is easy. .

  In the conductive composition, the content of the component (B) is preferably 1 to 50 parts by mass, more preferably 1 to 30 parts by mass with respect to 100 parts by mass of the component (A). When the content is 1 part by mass or less, the heat resistance is insufficient, and when it is 30 parts by mass or more, the conductivity may decrease. When the component (B) is used during the polymerization of the component (A), in order to control the content of the component (B) within this range, the component (B) remaining after the polymerization of the component (A) is treated with an acid such as sulfuric acid. A component (B) that is the same or different from the component (B) that is removed by washing in an alcohol solvent such as methanol and removed to a desired amount may be added.

  In the present invention, a conductor is produced by sequentially performing a step of forming a coating film by applying the conductive composition to a substrate and a step of performing a heat treatment on the coating film if necessary. To do.

  The base material on which the conductive composition is applied is not particularly limited, and polymer compounds, wood, paper materials, ceramics, and films or glass plates thereof are used. For example, as a base material made of a polymer compound, polyethylene, polyvinyl chloride, polypropylene, polystyrene, ABS resin, AS resin, methacrylic resin, polybutadiene, polycarbonate, polyarylate, polyvinylidene fluoride, polyamide, polyimide, polyaramid, polyphenylene sulfide, Examples thereof include a polymer film containing one or more of polyether ether ketone, polyphenylene ether, polyether nitrile, polyamide imide, polyether sulfone, polysulfone, polyether imide, polybutylene terephthalate, and the like. Since these polymer films form a conductive film made of the conductive composition on at least one surface thereof, the film surface is subjected to corona surface treatment or plasma treatment for the purpose of improving the adhesion of the conductive film. Is preferably applied.

  As for the heat processing with respect to the said coating film, 125-180 degreeC is preferable.

  When the temperature of the heat treatment is 125 ° C. or higher, the heat treatment can volatilize the component (A) and the component (B) forming a salt, and a conductor exhibiting high conductivity is obtained. It is done. On the other hand, when the temperature is lower than 125 ° C., the volatilization of the component (B) from the conductive composition is not sufficient and the conductivity is not sufficiently exhibited. When this temperature exceeds 180 degreeC, a decomposition | disassembly of a component (A) will arise and there exists a possibility of generating acidic gas.

As a method for coating the conductive composition, a method generally used for coating a paint can be used. For example, gravure coater, roll coater, curtain flow coater, spin coater, bar coater, reverse coater, kiss coater, fan ten coater, rod coater, air doctor coater, knife coater, blade coater, cast coater, screen coater, etc. A spraying method such as coating or a dipping method such as dip is used.
The conductors described above can also be used for capacitor applications. Examples of applicable capacitors include aluminum electrolytic capacitors, tantalum capacitors, and solid electrolytic capacitors.
For example, the case of manufacturing a wound capacitor using a conductive polymer as a solid electrolyte for a solid electrolytic capacitor will be described.
First, a capacitor element is formed by winding an anode foil on which a dielectric oxide film layer is formed and a cathode foil that has been subjected to etching treatment or post-etching chemical conversion treatment with a separator interposed therebetween. Thereafter, a conductive polymer layer made of the conductive polymer is formed on the element.

  Examples of the method for forming the conductive polymer layer include a method of impregnating the anode foil or the capacitor element with the aqueous dispersion of the conductive polymer.

  Thereafter, a carbon paste is applied on the conductive polymer layer to form a carbon layer on the conductive polymer layer. Further, a silver paste is applied on the carbon layer and dried at a predetermined temperature to form a silver paint layer on the carbon layer. A cathode terminal is connected to the silver paint layer via a conductive adhesive. An anode terminal is connected to the anode foil.

Thereafter, the mold exterior resin is formed so that the ends of the anode terminal and the cathode terminal are drawn out to the outside. A solid electrolytic capacitor is produced by the above method.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[Production Example 1 (Production of water-soluble conductive polymer (A) powder)]
100 mmol of 2-aminoanisole-4-sulfonic acid is dissolved in 30 ml of water: acetonitrile = 5: 5 solution of N: N-dimethylaniline at a concentration of 4 mol / l at 0 ° C. and water containing 100 mmol of ammonium peroxodisulfate. : Dropped into 100 ml of acetonitrile 5: 5 solution under cooling. After completion of the dropwise addition, the mixture was further stirred for 12 hours at 25 ° C., and then the reaction product was filtered off with a centrifugal filter, washed with a methyl alcohol solution of sulfuric acid and dried to obtain 10 g of water-soluble conductive polymer (A) powder. It was.

The content of triacylamine contained in the obtained polymer was 0.01% or less.
[Examples and Comparative Examples]
(1. Preparation of conductive composition)
At room temperature, the water-soluble conductive polymer (A) powder shown in Table 1 was dissolved in the solvent (C) in the blending amount shown in Table 1, and the basic compound (B) shown in Table 1 was added to conduct the conductivity. Compositions 1-16 were prepared. Conductive compositions 1 to 15 are examples, and conductive composition 16 is a comparative example.

  Table 1 also shows the type of component (B) used in the production of each water-soluble conductive polymer powder.

（導電性評価）
ガラス基材に、上記導電性組成物１〜１６をそれぞれスピンコート塗布（５００ｒｐｍ×５秒間＋２０００ｒｐｍ×６０秒間）した後、ホットプレートにて０〜２５０℃の範囲で５０℃刻みの温度（表２または表３に示す）で２分間加熱処理を行い、膜厚約０．１μｍの導電膜を形成して導電体を得た。

(Conductivity evaluation)
Each of the conductive compositions 1 to 16 was spin-coated on a glass substrate (500 rpm × 5 seconds + 2000 rpm × 60 seconds), and then a temperature in the range of 0 ° C. to 250 ° C. on a hot plate (Table 2). Or as shown in Table 3) for 2 minutes, a conductive film having a thickness of about 0.1 μm was formed to obtain a conductor.

  The surface resistance [Ω] of the obtained conductor was measured by a two-terminal method (distance between electrodes 20 mm) using Hiresta MCP-HT260 (manufactured by Mitsubishi Chemical Corporation). The results are shown in Table 2 or Table 3. Further, from the results, a graph was created with the temperature of the heat treatment (baking temperature) on the horizontal axis and the surface resistance value on the vertical axis. The graph is shown in FIG.

  From these results, it was confirmed that the deterioration of conductivity at 150 ° C. or higher was suppressed by adding a basic compound.

In Test Example 1, for conductive compositions 1 to 16, the horizontal axis represents the baking temperature (° C.) and the vertical axis represents the surface resistance value (Ω) of the conductor.

Claims (1)

  A conductive composition for a capacitor electrode, comprising a water-soluble conductive polymer (A) having a sulfonic acid group and / or a carboxy group, a basic compound (B), and a solvent (C).

Images