JP2002128877A - Method for using alkyldiphenyl ether sulfonate, method for using alkyldinaphthalene ether sulfonate, conductive polymer material and solid electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive polymer material hardly causing a de-doping phenomenon. SOLUTION: This conductive material includes a heterocyclic polymer obtained by polymerizing a heterocyclic monomer and an alkyldiphenyl ether sulfonate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive polymer and a solid electrolytic capacitor using the conductive polymer as an electrolyte.

[0002]

2. Description of the Related Art In recent years, as electronic devices have become smaller and lighter, there has been a demand for small-sized, large-capacity high-frequency capacitors having low impedance in a high-frequency region.

[0003] Mica capacitors, film capacitors, ceramic capacitors, and the like are used as high-frequency capacitors.
This type of capacitor is not suitable for large capacity.

[0004] On the other hand, capacitors suitable for increasing the capacity include aluminum electrolytic capacitors and tantalum electrolytic capacitors. However, aluminum electrolytic capacitors are
Although a large capacity can be achieved at low cost, there are problems such as a change with time due to evaporation of the electrolytic solution and a high impedance at a high frequency because the electrolytic solution is used.

[0005] A tantalum solid electrolytic capacitor is a capacitor that has little capacity deterioration because solid manganese dioxide is used as an electrolyte. However, the solid electrolyte of a tantalum solid electrolytic capacitor is formed by impregnating an aqueous manganese nitrate solution to the inside of a sintered tantalum body and then thermally decomposing manganese nitrate at about 350 ° C. It has to be repeated from several times to several tens of times, which requires considerable labor in the process of forming the solid electrolyte. Further, since the manganese dioxide film has a poor self-healing property, there is a disadvantage in that if the oxide film is damaged during energization, there is a danger of ignition or the like.

Therefore, in order to solve the above-mentioned problems, Japanese Patent Application Laid-Open No. 58-17609 discloses a solid electrolyte which has excellent repairability of a dielectric oxide film and has good conductivity. 8-tetracyanoquinodimethane complex salt (TC
NQ complex) has been proposed.

[0007] However, a solid electrolytic capacitor using this kind of compound has a TCN during cooling and solidification after immersion.
Since the Q complex salt crystallized and did not sufficiently adhere to the dielectric oxide film, there was a problem that an initial capacitance could not be obtained. Further, the TCNQ complex salt has low stability to heat, and tends to be thermally decomposed in a short time to be insulated when kept in a molten state at a high temperature. Therefore, a process and equipment for rapidly cooling after performing the impregnation treatment in a very short time are required, and as a result, there is a disadvantage that the production cost is increased.

For this reason, use of a conductive polymer having excellent electric conductivity and easy formation of a solid electrolyte as a solid electrolyte is disclosed in JP-A-60-37114 and JP-A-60-24.
No. 4 has been proposed. According to this method, it is possible to obtain a solid electrolytic capacitor having a lower manufacturing cost, a reliable capacitance, less damage to the dielectric oxide film, and less leakage current as compared with the above-described solid electrolytic capacitor. Was.

The conductive polymer is obtained by subjecting a heterocyclic monomer such as pyrrole, thiophene or furan to electrolytic polymerization together with a supporting electrolyte to anodize a polymer having good conductivity using the anion of the supporting electrolyte as a dopant. It is formed by forming a film on a film. Further, as the dopant of the conductive polymer, a halide such as perchlorate ion, boron tetrafluoride ion, etc., paratoluenesulfonic acid ion, dodecylbenzenesulfonic acid ion and the like are used.

[0010]

However, when a conductive polymer utilizing the above-mentioned dopant is used as a fixed electrolyte, there is a problem that undoping is liable to occur, and undoping is particularly difficult when exposed to high temperatures. It showed a remarkable tendency.

In order to solve this problem, alkylnaphthalenesulfonate ion, p-phenolsulfonate ion, sulfosalicylate ion, sulfobenzoate ion, benzenesulfonate ion, sulfoisophthalate ion, naphthalenedisulfonic acid ion, benzenedisulfone ion Dopants such as acid ions and naphthalene trisulfonate ions are disclosed in Japanese Patent No. 2701798,
Although it is disclosed in JP-A-119213, JP-A-10-32145, and the like, the present situation has not sufficiently solved the problem of undoping.

The present invention solves the above-mentioned problems, and provides a method for using a conductive polymer as a dopant which hardly causes undoping, and a conductive polymer material containing the dopant. is there.

[0013]

According to the present invention, there is provided a method for using the alkyldiphenyl ether sulfonate according to the present invention.
As described in above, a method of using an alkyldiphenyl ether sulfonate as a dopant for a conductive polymer.

Further, the method of using the alkyl dinaphthalene ether sulfonate according to the present invention is a method of using the alkyl dinaphthalene ether sulfonate as a dopant for a conductive polymer as described in claim 2. is there.

Further, the conductive polymer material according to the present invention comprises:
According to a third aspect of the present invention, there is provided a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyldiphenyl ether sulfonate.

Further, the conductive polymer material according to the present invention comprises:
According to a fourth aspect of the present invention, there is provided a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyl dinaphthalene ether sulfonate.

Further, the conductive polymer material according to the present invention comprises:
According to a fifth aspect, in the invention according to the third or fourth aspect, the heterocyclic polymer is a conductive polymer material containing at least one of polypyrrole, polythiophene, and polyfuran. It is.

Further, a solid electrolytic capacitor according to the present invention is a solid electrolytic capacitor using the conductive polymer material according to claim 3 or 4.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have found that, when an alkyldiphenyl ether sulfonate is used as a dopant for a conductive polymer, the undoping phenomenon can be accurately prevented, and the undoping even when exposed to high temperatures. The present invention has been completed based on the new finding that the phenomenon can be prevented.

Further, the present inventors have found that, when an alkyldinaphthalene ether sulfonate is used as a dopant for a conductive polymer, the undoping phenomenon can be accurately prevented, and even when exposed to a high temperature, the undoped phenomenon can be prevented. The present invention has been completed based on the new finding that the phenomenon can be prevented.

As the alkyl group in the alkyl diphenyl ether sulfonate or the alkyl dinaphthalene ether sulfonate, an alkyl group having 0 to 20 carbon atoms is preferably used. The carbon number of the alkyl group affects the solubility in water. When the carbon number of the alkyl group is 12, the solubility has a maximum value. When the carbon number of the alkyl group is 21 or more, the solubility in water is extremely reduced. This is because there is a tendency to do so. Note that an alkyl group having 0 carbon atoms means hydrogen.

The alkyl group in the alkyl diphenyl ether sulfonate or the alkyl dinaphthalene ether sulfonate also includes a substituted alkyl group. Specific examples of the substituted alkyl group include
An alkyl group substituted with a halogen such as F, Cl, or Br can be preferably used. In particular, among the halogen-substituted alkyl groups substituted with halogen, the production cost is low, so that a fluorine-substituted alkyl group substituted with fluorine can be preferably used.

The number of sulfonic acid groups in the alkyl diphenyl ether sulfonate or the alkyl dinaphthalene ether sulfonate is preferably 1 to 5. Therefore, in the above alkyl diphenyl ether sulfonate, when the number of sulfonic acid groups in one phenyl group is p and the number of sulfonic acid groups in the other phenyl group is q, the inequality 1 ≦ p + q ≦ 5
And the inequality 0 ≦ p ≦ 5 and the inequality 0 ≦ q ≦ 5 are preferably satisfied. In addition, the solubility in water increases as the number of sulfonic acid groups increases, but from the viewpoint of manufacturing cost,
More preferably, the number of sulfonic acid groups is 1-3. Therefore, in the alkyl diphenyl ether sulfonate, when the number of sulfonic acid groups in one phenyl group is p and the number of sulfonic acid groups in the other phenyl group is q, the inequality 1 ≦ p + q ≦ 3; It is preferable to satisfy the inequalities 0 ≦ p ≦ 3 and the inequalities 0 ≦ q ≦ 3. If the synthesis is performed in the case where the number of sulfonic acid groups is 4 or more, the yield is extremely reduced, and the cost is greatly increased.

The above-mentioned alkyl diphenyl ether sulfonate is represented by the following chemical formula (1).

[0025]

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Here, R ₁ and R ₂ are alkyl groups, and the alkyl groups R ₁ and R ₂ preferably have 0 to 20 carbon atoms. Further, the alkyl group R ₁ and the alkyl group R ₂ also contain a substituted alkyl group, and F, Cl, B
It contains an alkyl group substituted with a halogen such as r. m is the number of alkyl groups R ₁ , and can be any natural number from 1 to 5 as long as it can be substituted. Further, n is the number of the alkyl group R ₂ , and can take any natural number of 1 or more and 5 or less within a replaceable range. Further, the alkyl group R ₁ and the alkyl group R ₂ can be used whether they are linear or branched. In the formula 1, an alkyl group R ₁ ,
Although the position of the alkyl group R ₂ in the benzene ring is not described, it can be located in any position as long as the hydrogen of the benzene ring can be substituted and the orientation condition is satisfied. In addition, as shown in Formula 1, the alkyl group R ₁ and the alkyl group R ₂ are respectively provided in the cyclic figures described next to the two benzene rings because the alkyl group R ₁ and the alkyl group R ₂ means that it can be located anywhere as long as the hydrogen of the benzene ring can be substituted and the condition of orientation is satisfied.

[SO ₃ (X)] _p , [SO ₃ (X)]
₃ (Y)] _q is a sulfonic acid group. Regarding p and q, which are the number of sulfonic acid groups, inequality 1 ≦ p + q ≦ 5;
It is preferable to satisfy the inequalities 0 ≦ p ≦ 5 and the inequalities 0 ≦ q ≦ 5. It is also possible to satisfy the inequality 1 ≦ p + q ≦ 5, the inequality 0 ≦ p ≦ 3, and the inequality 0 ≦ q ≦ 3. Also, from the viewpoint of manufacturing cost,
More preferably, the inequality 1 ≦ p + q ≦ 3, the inequality 0 ≦ p ≦ 3, and the inequality 0 ≦ q ≦ 3 are satisfied. X in the sulfonic acid group [SO ₃ (X)] _p forms a counter ion with SO ₃ ^−, and is H, Na, NH ₄ ⁺ , (CH ₃ ) ₃
NH or the like can be used. Similarly, Y in the sulfonic acid group [SO ₃ (Y)] _p forms a counter ion with SO ₃ ^−, and is H, Na, NH ₄ ⁺ , (CH ₃ ) ₃ N
H or the like can be used. In the formula 1, a sulfonic acid group [SO ₃ (X)] _p , a sulfonic acid group [SO
₃ (Y)] Although it is not described where _q is located in the benzene ring, _q can be located anywhere as long as the hydrogen of the benzene ring can be replaced and the orientation condition is satisfied. is there. As shown in the formula 1, the sulfonic acid group [SO ₃ (X)] _p and the sulfonic acid group [SO
₃ (Y)] _q are provided respectively for the sulfonic acid group [SO ₃ (X)] _p and the sulfonic acid group [SO ₃ (Y)]
_q means that it can be located anywhere as long as the hydrogen of the benzene ring can be replaced and the condition of orientation is satisfied. Alkyl diphenyl ether sulfonate has two benzene rings and a bulky molecular structure, which makes it difficult for undoping to occur under high temperature and high humidity, and minimizes the deterioration of the electrical properties of the conductive polymer. It seems that it is possible. Therefore, when the conductive polymer according to the present invention is used as an electrolyte, it is possible to obtain a solid electrolytic capacitor having a small loss and a small leakage current and a small deterioration of the capacitor characteristics under high temperature and high humidity.

Next, the above-mentioned alkyldinaphthalene ether sulfonate is represented by the following chemical formula (2).

[0029]

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Here, R ₁ and R ₂ are alkyl groups, and the alkyl groups R ₁ and R ₂ preferably have 0 to 20 carbon atoms. Further, the alkyl group R ₁ and the alkyl group R ₂ also contain a substituted alkyl group, and F, Cl, B
It contains an alkyl group substituted with a halogen such as r. m is the number of alkyl groups R ₁ , and can be any natural number from 1 to 5 as long as it can be substituted. Further, n is the number of the alkyl group R ₂ , and can take any natural number of 1 or more and 5 or less within a replaceable range. Further, the alkyl group R ₁ and the alkyl group R ₂ can be used whether they are linear or branched. In the formula 2, an alkyl group R ₁ ,
Although the position of the alkyl group R ₂ in the naphthalene ring is not described, it can be located in any position as long as the hydrogen of the naphthalene ring can be substituted and the condition of orientation is satisfied. Incidentally, as shown in Equation 2, so as to penetrate each of the two naphthalene rings, the alkyl group R _1, the alkyl group R ₂ are respectively provided is an alkyl group R _1, the alkyl group R ₂ is naphthalene As long as the hydrogen in the ring can be substituted and the condition for orientation is satisfied,
It means that it can be located anywhere.

[SO]_Three(X)]_p, [SO
_Three(Y)]_qIs a sulfonic acid group. Sulfonic acid group
For the numbers p and q, the inequality 1 ≦ p + q ≦ 5,
The inequality 0 ≦ p ≦ 5 and the inequality 0 ≦ q ≦ 5 must be satisfied.
Is preferred. In addition, the inequality 1 ≦ p + q ≦ 5 and the inequality
0 ≦ p ≦ 3 and 0 ≦ q ≦ 3.
It is also possible. Also, from the viewpoint of manufacturing cost,
Inequality 1 ≦ p + q ≦ 3, inequality 0 ≦ p ≦ 3, and inequality
It is more preferable to satisfy 0 ≦ q ≦ 3. Sulfo
Acid group [SO_Three(X)]_pWhere X is SO_Three ^-And counter ion
H, Na, NH_Four ⁺, (CH_Three)_Three
NH or the like can be used. Similarly, sulfone
Acid group [SO_Three(Y)]_pY is SO_Three ^-And counter ion
H, Na, NH_Four ⁺, (CH_Three)_ThreeN
H or the like can be used. In formula 2,
Sulfonic acid group [SO_Three(X)]_p, A sulfonic acid group [SO
_Three(Y)]_qIs located anywhere in the naphthalene ring
Is not described, but hydrogen of naphthalene ring can be substituted
It can be located anywhere within a reasonable range. What
In addition, as shown in Formula 2, each of the two naphthalene rings
Through the sulfonic acid group [SO _Three(X)]_p, Sulfo
Acid group [SO_Three(Y)]_qIs provided for each
Represents a sulfonic acid group [SO_Three(X)]_p, A sulfonic acid group [S
O_Three(Y)]_qIs the range in which hydrogen on the naphthalene ring can be replaced
It is located anywhere as long as the orientation conditions are satisfied
It is meant to be possible. Alkyl
Dinaphthalene ether sulfonate has a bulky molecular structure.
Has two naphthalene rings.
Doping is less likely to occur and the electrical properties of conductive polymers are poor.
It is thought that it is possible to suppress
It is. Therefore, the conductive polymer according to the present invention is used as an electrolyte.
When used as, low loss and leakage current, high temperature
・ Solid-state capacitors with less deterioration of capacitor characteristics under high humidity
The solution capacitor can be obtained.

As the base polymer serving as the base of the conductive polymer, a polymer compound having at least one compound selected from heterocyclic compounds as a repeating unit can be used. As the heterocyclic compound, pyrrole, thiophene, furan or a derivative thereof can be used. When an appropriate substance is doped into the inside of the conductive polymer, the conductive polymer exhibits metallic properties and the conductivity is significantly increased. This substance to be doped is referred to as a dopant.

The conductive polymer material according to the present invention is a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyldiphenyl ether sulfonate. The conductive polymer material according to the present invention is a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyl dinaphthalene ether sulfonate. The heterocyclic polymer is polypyrrole, polythiophene, or
It is possible to use polyfuran. The conductive polymer material is doped with the dopant uniformly and at a high concentration to increase its conductivity, and also to increase the adhesion with the anode, so that the above heterocyclic compound is used as a monomer, and the above alkyl diphenyl ether sulfonate is used. Alternatively, it is desirable to carry out the reaction by electrolytic polymerization using an alkyl dinaphthalene ether sulfonate as a supporting electrolyte. The alkyl diphenyl ether sulfonate or alkyl dinaphthalene ether sulfonate used as the supporting electrolyte can be used not only in the form of a salt but also in the form of a free acid.

The solid electrolytic capacitor according to the present invention is a solid electrolytic capacitor using the conductive polymer material according to the present invention. In manufacturing a solid electrolytic capacitor, first, an anode body made of a valve metal such as Al or Ta is formed. The anode body desirably has a large surface area in order to increase the capacitor capacity. Therefore, a material obtained by winding or laminating a foil whose surface has been roughened by etching, a porous sintered body, or the like is used for the anode body. next,
By subjecting the anode body to an electrolytic oxidation treatment, a dielectric oxide film is formed on the surface of the anode body. Then, a cathode layer made of a conductive polymer material is formed on the dielectric oxide film. The conductive polymer material includes a conductive polymer material according to the present invention, that is, a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyldiphenyl ether sulfonate. Molecular material, or
A heterocyclic polymer obtained by polymerizing a heterocyclic monomer,
A conductive polymer material containing an alkyl dinaphthalene ether sulfonate is used. In order to form a cathode layer made of a conductive polymer material, there is a method utilizing chemical oxidation polymerization or electrolytic oxidation polymerization.In general, a conductive polymer material layer formed using electrolytic oxidation polymerization is , Compared to the case of chemical oxidative polymerization, the strength is stronger, the conductivity is higher,
It becomes a uniform and high quality conductive polymer material layer. For the solid electrolytic capacitor element formed through the above steps,
The anode lead and the cathode lead are respectively taken out from the anode body and the cathode layer, the outer shell is formed with an epoxy resin or the like, and the aging treatment is performed, whereby the solid electrolytic capacitor according to the present invention can be manufactured.

[0035]

EXAMPLES (Example 1) A 0.2 M pyrrole / 0.1 M sodium dodecyl diphenyl ether sulfonate sodium salt was used as a polymerization solution, an SUS304 electrode plate was used as a working electrode and a counter electrode, and a constant current ( ² mA / cm ²⁾ was used. ) For 30 minutes. The sodium salt of dodecyl diphenyl ether sulfonic acid is shown in Formula 3 below.

[0036]

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In formula 3, the position of the sulfonic acid group in each benzene ring is not specified. Equation 3
, The position of the dodecyl group is not specified. The reference electrode was a saturated calomel electrode. After the electrolytic polymerization, the polymer was washed and the polypyrrole film was peeled off from the electrode to obtain a conductive polymer material according to the present invention. In addition, one dodecyl diphenyl ether sulfonic acid as a dopant is incorporated into six pyrrole units. Then, it was left in an air atmosphere at 150 ° C. for 40 hours. As a result, while the initial resistance was 0.10 Ωcm, the resistance after 40 hours was 0.33 Ωcm. The results are shown in Table 1 below.
It describes in. As described above, the polypyrrole film using dodecyl diphenyl ether sulfonate sodium salt as a dopant showed good characteristics with almost no increase in resistance due to thermal degradation.

Example 2 A polypyrrole film was prepared under the same conditions as in Example 1 except that 0.2 M pyrrole / 0.1 M sodium diphenyl ether sulfonate was used as the polymerization solution. The diphenyl ether sulfonic acid sodium salt is shown in Formula 4 below.

[0039]

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In formula 4, the position of the sulfonic acid group in each benzene ring is not specified. After the electrolytic polymerization, the polymer was washed and the polypyrrole film was peeled off from the electrode to obtain a conductive polymer material according to the present invention. In addition, one diphenyl ether sulfonic acid as a dopant is incorporated into six pyrrole units. Then 15
It was left in an air atmosphere at 0 ° C. for 40 hours. As a result, while the initial resistance was 0.08 Ωcm, the resistance after 40 hours was 0.47 Ωcm. The results are shown in Table 1 below. As described above, the polypyrrole film using the sodium salt of diphenyl ether sulfonic acid as a dopant showed good characteristics with almost no increase in resistance due to thermal degradation.

(Example 3) A 0.2 M pyrrole / 0.1 M butyl diphenyl ether sulfonate sodium salt was used as a polymerization solution, a SUS304 electrode plate was used as a working electrode and a counter electrode, and a constant current ( ² mA / cm ² ) was used. For 30 minutes. The butyl diphenyl ether sulfonic acid sodium salt is shown in Formula 5 below.

[0042]

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In formula 5, the position of the sulfonic acid group in each benzene ring is not specified. Equation 5
Does not specify the position of the butyl group. After electrolytic polymerization, wash and peel the polypyrrole film from the electrode,
The conductive polymer material according to the present invention was obtained. In addition, one butyl diphenyl ether sulfonic acid as a dopant is incorporated into six pyrrole units. Then, it was left in an air atmosphere at 150 ° C. for 40 hours. As a result, while the initial resistance value was 0.10 Ωcm,
The resistance after time was 0.36 Ωcm. The results are shown in Table 1 below. Thus, the polypyrrole film using butyl diphenyl ether sulfonate sodium salt as a dopant showed good characteristics with almost no increase in resistance due to thermal degradation.

Comparative Example 1 A polypyrrole film was prepared under the same conditions as in Example 1 except that 0.2 M pyrrole / 0.1 M sodium dodecylbenzenesulfonate was used as the polymerization liquid. The structure of dodecylbenzenesulfonic acid sodium salt is shown in Formula 6 below.

[0045]

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After the electrolytic polymerization, the polymer was washed and the polypyrrole film was peeled off from the electrode to obtain a conductive polymer material according to Comparative Example 1. Then, it was left in an air atmosphere at 150 ° C. for 40 hours. As a result, while the initial resistance was 0.07 Ωcm, the resistance after 40 hours was 80.40 Ωcm. The results are shown in Table 1 below. As described above, the polypyrrole film using sodium dodecylbenzenesulfonate as a dopant exhibited a property in which the resistance value was largely increased due to thermal degradation and was not good.

Comparative Example 2 A polypyrrole film was prepared under the same conditions as in Example 1 except that 0.2 M pyrrole / 0.1 M p-toluenesulfonic acid sodium salt was used as the polymerization liquid. The structure of 1Mp-toluenesulfonic acid sodium salt is shown in Formula 7 below.

[0048]

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After electrolytic polymerization, the polymer was washed and the polypyrrole film was peeled off from the electrode to obtain a conductive polymer material according to Comparative Example 2. Then, it was left in an air atmosphere at 150 ° C. for 40 hours. As a result, while the initial resistance was 0.05 Ωcm, the resistance after 40 hours was 5.81 Ωcm. The results are shown in Table 1 below. As described above, the polypyrrole film using sodium p-toluenesulfonate as a dopant exhibited a property in which the resistance value was largely increased due to thermal degradation and was not good.

[0050]

[Table 1]

As shown in Table 1, it can be understood that a polypyrrole film using sodium dodecyldiphenylethersulfonate as a dopant was a polypyrrole film having excellent initial heat resistance and an extremely high heat resistance. It can also be seen that a polypyrrole film using sodium diphenylethersulfonate as a dopant also obtained a polypyrrole film having excellent heat resistance at the same level of initial resistance.
Furthermore, it can be understood that a polypyrrole film using butyl diphenyl ether sulfonate sodium salt as a dopant and having extremely excellent heat resistance at the same level of initial resistance was obtained.

In the above-described embodiment, the case where the dopant is an alkyl diphenyl ether sulfonate is shown. However, even when the dopant is an alkyl dinaphthalene ether sulfonate, the initial resistance is very similar. A polypyrrole film having excellent heat resistance can be obtained.

The embodiments and examples disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0054]

The conductive polymer material according to the present invention is a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer and an alkyldiphenyl ether sulfonate. The conductive polymer material according to the present invention is a conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer, and an alkyl dinaphthalene ether sulfonate. The conductive polymer material according to the present invention hardly undergoes undoping under high temperature and high humidity, and can suppress deterioration of the electrical characteristics of the conductive polymer to a very small extent. In addition, the solid electrolytic capacitor according to the present invention uses a conductive polymer material that is unlikely to be dedoped under high temperature and high humidity. This is a solid electrolytic capacitor with excellent reliability characteristics with little deterioration in capacity, loss and leakage current when left in a high-humidity no-load condition.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshikazu Hirata, 1-1, Sanyo-cho, Daito-shi, Osaka Prefecture Inside Sanyo Electronics Parts Products Co., Ltd. (72) Hideshi Uekawa 1-1, Sanyo-cho, Daito-shi, Osaka No. F-term (reference) in Sanyo Electronics Co., Ltd. 4J032 BA03 BA08 BA13 BB01 BC21 BC32 BD02

Claims (6)

[Claims] 1. Use of an alkyldiphenyl ether sulfonate as a dopant for a conductive polymer. 2. Use of an alkyl dinaphthalene ether sulfonate as a dopant for a conductive polymer. 3. A conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer and an alkyldiphenyl ether sulfonate. 4. A conductive polymer material containing a heterocyclic polymer obtained by polymerizing a heterocyclic monomer and an alkyl dinaphthalene ether sulfonate. 5. The heterocyclic polymer is polypyrrole,
5. The conductive polymer material according to claim 3, wherein the conductive polymer material contains at least one of polythiophene and polyfuran. 6. A solid electrolytic capacitor using the conductive polymer material according to claim 3.