WO2015037481A1 - 導電性高分子製造用モノマー液およびそれを用いる電解コンデンサの製造方法 - Google Patents
導電性高分子製造用モノマー液およびそれを用いる電解コンデンサの製造方法 Download PDFInfo
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- WO2015037481A1 WO2015037481A1 PCT/JP2014/073121 JP2014073121W WO2015037481A1 WO 2015037481 A1 WO2015037481 A1 WO 2015037481A1 JP 2014073121 W JP2014073121 W JP 2014073121W WO 2015037481 A1 WO2015037481 A1 WO 2015037481A1
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- WO
- WIPO (PCT)
- Prior art keywords
- conductive polymer
- monomer
- producing
- heterocyclic compound
- methylimidazole
- Prior art date
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- 239000000178 monomer Substances 0.000 title claims abstract description 325
- 229920001940 conductive polymer Polymers 0.000 title claims abstract description 315
- 239000003990 capacitor Substances 0.000 title claims abstract description 256
- 239000007788 liquid Substances 0.000 title claims abstract description 105
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 19
- 150000002391 heterocyclic compounds Chemical class 0.000 claims abstract description 106
- KAESVJOAVNADME-UHFFFAOYSA-N Pyrrole Chemical compound C=1C=CNC=1 KAESVJOAVNADME-UHFFFAOYSA-N 0.000 claims abstract description 103
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims abstract description 78
- 150000001875 compounds Chemical class 0.000 claims abstract description 65
- 229930192474 thiophene Natural products 0.000 claims abstract description 39
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 23
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims abstract description 15
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 150000003577 thiophenes Chemical class 0.000 claims abstract description 3
- -1 naphthalene monosulfonic acid heterocyclic compound Chemical class 0.000 claims description 103
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- 239000007800 oxidant agent Substances 0.000 claims description 43
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- 230000001590 oxidative effect Effects 0.000 claims description 39
- 239000006185 dispersion Substances 0.000 claims description 37
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 27
- 125000000217 alkyl group Chemical group 0.000 claims description 26
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N 4-methylimidazole Chemical compound CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 claims description 17
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- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 16
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- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 claims description 10
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- MCTWTZJPVLRJOU-UHFFFAOYSA-N 1-methyl-1H-imidazole Chemical compound CN1C=CN=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-N 0.000 claims description 9
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 9
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Classifications
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- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0029—Processes of manufacture
- H01G9/0036—Formation of the solid electrolyte layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/12—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
- C08G61/124—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds with a five-membered ring containing one nitrogen atom in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
- C08G61/126—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds with a five-membered ring containing one sulfur atom in the ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/02—Polyamines
- C08G73/026—Wholly aromatic polyamines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/0605—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms
- C08G73/0611—Polycondensates containing five-membered rings, not condensed with other rings, with nitrogen atoms as the only ring hetero atoms with only one nitrogen atom in the ring, e.g. polypyrroles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/06—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances
- H01B1/12—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of other non-metallic substances organic substances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/025—Solid electrolytes
- H01G9/028—Organic semiconducting electrolytes, e.g. TCNQ
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
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- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3223—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
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Definitions
- the present invention relates to a monomer liquid for producing a conductive polymer in which a substance serving as a dopant for a conductive polymer is dispersed in a monomer, and a method for producing an electrolytic capacitor using the same.
- Conductive polymers are used as solid electrolytes for electrolytic capacitors such as tantalum electrolytic capacitors, aluminum electrolytic capacitors, and niobium electrolytic capacitors because of their high conductivity.
- conductive polymer in this application those obtained by chemical oxidative polymerization or electrolytic oxidative polymerization of a polymerizable monomer such as thiophene or a derivative thereof, pyrrole or a derivative thereof, aniline or a derivative thereof are used. .
- organic sulfonic acid is mainly used, and among them, aromatic sulfonic acid is said to be suitable. Transition metals are used, and among them, ferric iron is said to be suitable.
- ferric salts of aromatic sulfonic acids are used as oxidants in chemical oxidative polymerization of polymerizable monomers such as thiophene or its derivatives. It is used as a dopant.
- ferric salts of aromatic sulfonic acids it is said that ferric salts of toluene sulfonic acid and ferric salts of methoxybenzene sulfonic acid are particularly useful, and conductive polymers using them. It can be synthesized by mixing those oxidizing agent / dopant with a polymerizable monomer such as thiophene or a derivative thereof, and is reported to be simple and suitable for industrialization (Patent Document 1, Patent Document) 2).
- electrolytic capacitors manufactured using a conductive polymer prepared using ferric aromatic sulfonate as an oxidant and dopant as a solid electrolyte have poor heat resistance and a large leakage current. was there. This is because iron used as an oxidizing agent in the synthesis of the conductive polymer used as the solid electrolyte cannot be completely removed from the conductive polymer, and iron remains in the conductive polymer. It is thought that this is due to
- Non-ferrous salt-based oxidizing agents have been studied, and for example, it has been proposed to use a mixture of an ammonium persulfate aqueous solution and a phenolsulfonic acid butylamine aqueous solution as an oxidizing agent / dopant solution (Patent Document 3).
- An electrolytic capacitor using a conductive polymer synthesized using a non-iron salt-based oxidant / dopant as a solid electrolyte is composed of a conductive polymer synthesized using an iron salt-based oxidant / dopant as a solid electrolyte.
- heat resistance is improved and leakage current is reduced, but ammonium persulfate deteriorates with time, so if it is not used immediately after preparation as an oxidizer / dopant solution, only cheap ammonium persulfate is available.
- an oxidizing agent / dopant solution had to be prepared in accordance with the production of the electrolytic capacitor.
- the present invention can provide a high-performance electrolytic capacitor, that is, an electrolytic capacitor having low (small) ESR, excellent heat resistance, and low leakage current, and its storage stability. It is an object of the present invention to provide a monomer solution for producing a conductive polymer that does not cause any problems and to produce an electrolytic capacitor having the above characteristics using the same.
- the present invention relates to at least one monomer selected from the group consisting of thiophene or a derivative thereof, pyrrole or a derivative thereof, and aniline or a derivative thereof, a naphthalenesulfonic acid-based heterocyclic compound, and a benzenesulfone having no hydroxyl group directly bonded to a benzene nucleus.
- the above-mentioned problems are solved by constituting a monomer liquid for producing a conductive polymer by dispersing at least one selected from the group consisting of acid-based heterocyclic compounds.
- At least one monomer selected from the group consisting of thiophene or a derivative thereof, pyrrole or a derivative thereof and aniline or a derivative thereof does not have a naphthalenesulfonic acid-based heterocyclic compound and a hydroxyl group directly bonded to a benzene nucleus.
- the present invention relates to a monomer solution for producing a conductive polymer, wherein at least one selected from the group consisting of benzenesulfonic acid-based heterocyclic compounds is dispersed.
- the naphthalene sulfonic acid type heterocyclic compound used in the present invention is preferably at least one selected from the group consisting of naphthalene monosulfonic acid type heterocyclic compounds and naphthalene trisulfonic acid type heterocyclic compounds.
- the heterocyclic ring of the heterocyclic compound preferably contains a nitrogen atom.
- heterocyclic compound portion in the naphthalenesulfonic acid-based heterocyclic compound examples include 2-methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, 2-methyl- Those containing a nitrogen atom in a heterocyclic ring such as 4-ethylimidazole, triazole, triazine, pyridine, morpholine, and hyperazine are preferred, and imidazoles are particularly preferred.
- naphthalenesulfonic acid-based heterocyclic compound satisfying these conditions include, for example, 2-methylimidazole naphthalenesulfonate, 2-methylimidazole naphthalenetrisulfonate, 2-ethyl-4-methylimidazole naphthalenesulfonate , 2-ethyl-4-methylimidazole naphthalenetrisulfonate, 4-methylimidazole naphthalenesulfonate, triazole naphthalenesulfonate, imidazole naphthalenetrisulfonate, 1-methylimidazole naphthalenetrisulfonate, 2-methylnaphthalenetrisulfonate 4-ethylimidazole, naphthalenetrisulfonic acid triazine, pyridine naphthalenetrisulfonic acid, morpholine naphthalenetrisulf
- the benzenesulfonic acid-based heterocyclic compound used in the present invention has no hydroxyl group directly bonded to the benzene nucleus (that is, does not have a hydroxyl group bonded to the constituent carbon of the benzene ring), and the benzenesulfonic acid-based heterocyclic compound described above.
- the ring compound include a benzenesulfonic acid heterocyclic compound, a benzenesulfonic acid heterocyclic compound having an alkyl group, a benzenesulfonic acid heterocyclic compound having an alkoxy group, and a benzenesulfonic acid heterocyclic compound having a nitro group.
- the heterocyclic ring of the benzenesulfonic acid-based heterocyclic compound preferably includes a nitrogen atom.
- the heterocyclic compound moiety in the benzenesulfonic acid-based heterocyclic compound include 2-methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, 2-methyl- Those containing a nitrogen atom in a heterocyclic ring such as 4-ethylimidazole, triazole, triazine, pyridine, morpholine and piperazine are preferred, and imidazoles are particularly preferred.
- Benzenesulfonic acid-based heterocyclic compounds that satisfy these conditions, and particularly preferred examples among them include benzenesulfonic acid 2-methylimidazole, toluenesulfonic acid 2-methylimidazole, methoxybenzenesulfone, and the like. Examples thereof include 2-methylimidazole acid, 2-methylimidazole nitrobenzene sulfonate, 2-methylimidazole cumene sulfonate, and the like.
- the monomer liquid for producing the conductive polymer at least one selected from the group consisting of a monomer, a naphthalenesulfonic acid heterocyclic compound, and a benzenesulfonic acid heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus.
- the ratio by weight is preferably 1: 0.1 to 0.1: 1 by mass ratio, and an alcohol having 1 to 4 carbon atoms is added to the monomer solution for producing the conductive polymer to increase the conductivity.
- the monomer liquid for molecular production is diluted, the handling property can be improved in the production of the electrolytic capacitor without deteriorating its characteristics.
- the electrolytic capacitor is produced using the monomer solution for producing a conductive polymer of the present invention, for example, after the capacitor element is impregnated with the monomer solution for producing the conductive polymer of the present invention, and then the oxidant solution is added to the capacitor element Is carried out by forming a solid electrolyte layer made of a conductive polymer through at least one step of impregnating and polymerizing the monomer.
- an electrolytic capacitor can be manufactured by forming a solid electrolyte layer made of a conductive polymer.
- the conductive polymer is used for the conductive polymer production as described above.
- Forming a solid electrolyte layer made of a conductive polymer, then impregnating with a dispersion of the conductive polymer and then drying at least once, and further forming a solid electrolyte layer made of the conductive polymer thus, an electrolytic capacitor can also be manufactured.
- an electrolytic capacitor with low ESR, excellent heat resistance, and low leakage current, and to provide a monomer solution for producing a conductive polymer that does not cause a problem with respect to its storage stability. be able to.
- the monomer liquid for producing a conductive polymer according to the present invention can synthesize a conductive polymer using a non-ferrous salt oxidant such as ammonium persulfate, and therefore uses an iron salt oxidant. Therefore, an electrolytic capacitor having a low ESR, excellent heat resistance, and low leakage current can be produced without causing a decrease in heat resistance and an increase in leakage current that occurred in the case of the above.
- a non-ferrous salt oxidant such as ammonium persulfate
- the dopant in the monomer liquid for producing a conductive polymer of the present invention is selected from the group consisting of a naphthalenesulfonic acid heterocyclic compound having excellent heat resistance and a benzenesulfonic acid heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus. It is composed of at least one selected, and an electrolytic capacitor having excellent heat resistance can be produced from a phenolsulfonic acid compound or the like.
- the monomer liquid for producing a conductive polymer of the present invention is composed of a monomer and a dopant, and in the production of an electrolytic capacitor using the monomer liquid for producing a conductive polymer, the above-mentioned conductive polymer production
- the monomer solution can be sufficiently impregnated into the inside of the capacitor element composed of a porous metal body such as a tantalum sintered body, and in this state, an oxidant impregnated later is encountered and polymerization is performed. Therefore, an electrolytic capacitor having a large capacity (capacitance) can be manufactured.
- a particularly characteristic one is a group consisting of a naphthalenesulfonic acid heterocyclic compound as a dopant and a benzenesulfonic acid heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus.
- naphthalene sulfonic acid type heterocyclic compound used in the present invention examples include naphthalene monosulfonic acid type heterocyclic compound, naphthalene disulfonic acid type heterocyclic compound, naphthalene trisulfonic acid type heterocyclic compound, and among them, naphthalene monosulfonic acid compound.
- a sulfonic acid type heterocyclic compound and a naphthalene trisulfonic acid type heterocyclic compound are preferable because they are easily available.
- Heterocycles in naphthalenesulfonic acid-based heterocyclic compounds include those containing a nitrogen atom, those containing an oxygen atom, those containing a sulfur atom, those nitrogen atoms, oxygen Examples include those containing two or more types of atoms and sulfur atoms, and those containing nitrogen atoms are preferable.
- heterocyclic compound containing the nitrogen atoms in the heterocyclic ring examples include 2- Methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, 2-methyl-4-ethylimidazole, triazole, triazine, pyridine, morpholine, piperazine and the like are preferable, and imidazoles are particularly preferable. preferable.
- heterocyclic compound moiety in the naphthalenesulfonic acid-based heterocyclic compound examples include 2-methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, 2-methyl- Those containing a nitrogen atom in a heterocyclic ring such as 4-ethylimidazole, triazole, triazine, pyridine, morpholine, and hyperazine are preferred, and imidazoles are particularly preferred.
- naphthalene monosulfonic acid type heterocyclic compound examples include, for example, naphthalenesulfonic acid 2-methylimidazole, naphthalenesulfonic acid 2-ethyl-4-methylimidazole, naphthalenesulfonic acid imidazole, naphthalenesulfonic acid.
- the naphthalene sulfonic acid heterocyclic compound is not a naphthalene sulfonic acid heterocyclic compound, but the naphthalene sulfonic acid heterocyclic compound is a naphthalene sulfonic acid-based compound used in the present invention by displaying such a character "system".
- the heterocyclic compound includes those in which an alkyl group or the like is bonded to the naphthalene nucleus.
- the naphthalene sulfonic acid heterocyclic compound is particularly preferably at least one selected from the group consisting of a naphthalene monosulfonic acid heterocyclic compound and a naphthalene trisulfonic acid heterocyclic compound in which an alkyl group or the like is not bonded to the naphthalene nucleus, Among these, naphthalene trisulfonic acid heterocyclic compounds are most preferable.
- naphthalene trisulfonic acid-based heterocyclic compound when a specific example of a naphthalene trisulfonic acid-based heterocyclic compound is illustrated, “tri” indicating the number of sulfonic acid groups is added and displayed, for example, 2-methylimidazole naphthalene trisulfonic acid.
- a specific example of a monosulfonic acid-based heterocyclic compound when a specific example of a monosulfonic acid-based heterocyclic compound is exemplified, it is often displayed without adding “mono”, so in this book, the naphthalene monosulfonic acid-based heterocyclic compound In the case of exemplifying a specific name, it is displayed without adding “mono” according to such a display method, such as 2-methylimidazole naphthalenesulfonate.
- naphthalene trisulfonic acid-based heterocyclic compound examples include, for example, naphthalene trisulfonic acid 2-methylimidazole, naphthalene trisulfonic acid 2-ethyl-4-methylimidazole, naphthalene trisulfonic acid imidazole, naphthalene trisulfonic acid 1-methylimidazole, 1-ethylimidazole naphthalenetrisulfonate, 2-methyl-4-ethylimidazole naphthalenetrisulfonate, 1-butylimidazole naphthalenetrisulfonate, 2-ethylimidazole naphthalenetrisulfonate, naphthalenetrisulfonic acid 4 -Methylimidazole, naphthalenetrisulfonic acid 1,2-dimethylimidazole, naphthalenetrisulfonic acid 1,2-
- benzenesulfonic acid-based heterocyclic compound having no hydroxyl group directly connected to the benzene nucleus used in the present invention
- benzenesulfonic acid-based heterocyclic compound are, for example, benzenesulfonic acid.
- Heterocyclic compounds that is, benzenesulfonic acid heterocyclic compounds having no substituent other than sulfonic acid group in the benzene nucleus
- benzenesulfonic acid heterocyclic compounds having an alkyl group benzenesulfonic acid heterocyclic compounds having an alkoxy group, nitro
- benzenesulfonic acid heterocyclic compound having a group can be used.
- the above alkyl group, alkoxy group, nitro group and the like may be bonded not only to one benzene nucleus but also to two or more benzene nuclei.
- the alkyl group has 1 to 4 carbon atoms, that is, the alkyl group is preferably a methyl group, ethyl group, propyl group, or butyl group, and the alkoxy group has 1 to 4 carbon atoms, that is, A methoxy group, an ethoxy group, a propoxy group, a butoxy group and the like are preferable.
- Examples of the preferred benzenesulfonic acid heterocyclic compound having an alkyl group as described above, which has one alkyl group in the benzene nucleus include, for example, a methylbenzenesulfonic acid heterocyclic compound (that is, Toluenesulfonic acid heterocyclic compounds), ethylbenzenesulfonic acid heterocyclic compounds, propylbenzenesulfonic acid heterocyclic compounds, butylbenzenesulfonic acid heterocyclic compounds, and the like.
- a methylbenzenesulfonic acid heterocyclic compound that is, Toluenesulfonic acid heterocyclic compounds
- ethylbenzenesulfonic acid heterocyclic compounds propylbenzenesulfonic acid heterocyclic compounds
- butylbenzenesulfonic acid heterocyclic compounds and the like.
- propyl and butyl they are linear. It may also be a branched chain.
- Examples of the benzenesulfonic acid heterocyclic compound having an alkoxy group and having one alkoxy group in the benzene nucleus are shown as examples.
- methoxybenzenesulfonic acid heterocyclic compound, ethoxybenzenesulfone, Acid heterocyclic compounds, propoxybenzenesulfonic acid heterocyclic compounds, butoxybenzenesulfonic acid heterocyclic compounds and the like In the case of the above propoxy and butoxy, they may be linear or branched. It may be a chain.
- the heterocyclic ring of the benzenesulfonic acid-based heterocyclic compound includes, as in the case of the heterocyclic ring of the naphthalenesulfonic acid-based heterocyclic compound, a structure including a nitrogen atom, a structure including an oxygen atom, sulfur Examples include those containing atoms and those containing two or more types of nitrogen atoms, oxygen atoms, and sulfur atoms, and those containing nitrogen atoms are preferred.
- heterocyclic compound containing a nitrogen atom in the heterocyclic ring examples include 2-methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, 2-methyl-4-ethylimidazole, Triazole, triazine, pyridine, morpholine, piperazine and the like are preferable, and imidazoles are particularly preferable. That is, examples of the heterocyclic compound moiety in the benzenesulfonic acid-based heterocyclic compound include 2-methylimidazole, 2-ethyl-4-methylimidazole, imidazole, 1-methylimidazole, 4-methylimidazole, and 2-methyl-4.
- -A compound containing a nitrogen atom in a heterocyclic ring such as ethyl imidazole, triazole, triazine, pyridine, morpholine, and hyperazine is preferable, and imidazoles are particularly preferable.
- benzenesulfonic acid heterocyclic compound examples include, for example, 2-methylimidazole benzenesulfonate, 2-ethyl-4-methylimidazole benzenesulfonate, imidazole benzenesulfonate, 1-benzenesulfonate.
- benzenesulfonic acid heterocyclic compound having an alkyl group a benzenesulfonic acid heterocyclic compound having an alkoxy group, a benzenesulfonic acid heterocyclic compound having a nitro group, and the like, as a heterocyclic compound bonded to the benzenesulfonic acid moiety.
- a heterocyclic compound bonded to the benzenesulfonic acid moiety are preferably the same heterocyclic compounds as those exemplified above for the benzenesulfonic acid heterocyclic compound.
- particularly preferred specific examples include 2-methylimizol toluene sulfonate, 2-methyl imidazole methoxybenzene sulfonate, 2-methylimidazole nitrobenzene sulfonate, 2-methylimidazole cumene benzene sulfonate (that is, Isopropylbenzenesulfonic acid 2-methylimidazole) and the like.
- the benzene sulfonic acid type heterocyclic compound is not a benzene sulfonic acid heterocyclic compound, but, as in the case of the naphthalene sulfonic acid type heterocyclic compound described above, the indication of “system” is used.
- the benzenesulfonic acid type heterocyclic compounds used in the present invention include those having an alkyl group, an alkoxy group, a nitro group or the like bonded to the benzene nucleus as described above. It is.
- benzenesulfonic acid-based heterocyclic compounds those having no hydroxyl group directly bonded to the benzene nucleus are, for example, 2-methylimidazole phenol sulfonate having one hydroxyl group directly bonded to the benzene nucleus.
- Example 3 it is based on the fact that it is hardly dispersed in an ethanol solution containing ethylenedioxythiophene and a desired monomer solution for producing a conductive polymer cannot be prepared.
- thiophene or a derivative thereof, pyrrole or a derivative thereof, aniline or a derivative thereof, or the like is used as a monomer for synthesizing the conductive polymer.
- thiophene or a derivative thereof is preferable, and thiophene or a derivative thereof is preferable.
- a derivative obtained by adding pyrrole or a derivative thereof to the derivative is particularly preferable.
- Examples of the thiophene derivative in the thiophene or a derivative thereof include 3,4-ethylenedioxythiophene, 3-alkylthiophene, 3-alkoxythiophene, 3-alkyl-4-alkoxythiophene, 3,4-alkylthiophene, 3 , 4-alkoxythiophene, and alkylated ethylenedioxythiophene obtained by modifying the above 3,4-ethylenedioxythiophene with an alkyl group, and the alkyl group or alkoxy group preferably has 1 to 16 carbon atoms, 1 to 4 is particularly preferable.
- the alkylated ethylenedioxythiophene obtained by modifying the 3,4-ethylenedioxythiophene with an alkyl group will be described in detail.
- the 3,4-ethylenedioxythiophene and the alkylated ethylenedioxythiophene are represented by the following general formula ( It corresponds to the compound represented by 1).
- R is hydrogen or an alkyl group
- R in the general formula (1) is hydrogen is 3,4-ethylenedioxythiophene, which is represented by the IUPAC name, “2,3-dihydro-thieno [3,4-b ], [1,4] dioxin (2,3-Dihydro-thieno [3,4-b] [1,4] dioxine) ”, but this compound has a generic name rather than the IUPAC name.
- R in the general formula (1) is an alkyl group
- the alkyl group is preferably one having 1 to 4 carbon atoms, that is, a methyl group, an ethyl group, a propyl group, or a butyl group.
- a compound in which R in the general formula (1) is a methyl group is represented by the name IUPAC “2-methyl-2,3-dihydro-thieno [3,4-b] [1,4 Dioxin (2-Methyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxine) ”, which will be simplified and represented as“ methylated ethylenedioxythiophene ”hereinafter. To do.
- a compound in which R in the general formula (1) is an ethyl group is represented by IUPAC name, “2-ethyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin (2-Ethyl).
- R in the general formula (1) is a butyl group
- R in the general formula (1) is a butyl group
- IUPAC name “2-butyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin
- 2,3-butyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxine” which will be simplified and represented as“ butylated ethylenedioxythiophene ”.
- 2-alkyl-2,3-dihydro-thieno [3,4-b] [1,4] dioxin is hereinafter simply expressed as “alkylated ethylenedioxythiophene”.
- methylated ethylenedioxythiophene, ethylated ethylenedioxythiophene, propylated ethylenedioxythiophene, and butylated ethylenedioxythiophene are preferable.
- alkylated ethylenedioxythiophenes can be used alone or in combination of two or more. Further, these alkylated ethylenedioxythiophene and ethylenedioxythiophene (3,4-ethylenedioxythiophene) can be used in combination. And these synthetic methods such as methylated ethylenedioxythiophene, ethylated ethylenedioxythiophene, propylated ethylenedioxythiophene, butylated ethylenedioxythiophene are disclosed in International Publication No. 2011 / No. 068026, International Publication No. 2011/074380, and the like.
- pyrrole derivatives in the pyrrole or derivatives thereof include, for example, 3-methylpyrrole, 3-ethylpyrrole, 3-propylpyrrole, 3-butylpyrrole, 3-pentylpyrrole, 3-hexylpyrrole, 3,4-ethylenediol.
- Examples include oxypyrrole.
- the thiophene or a derivative thereof (hereinafter sometimes referred to as “thiophene monomer”) as a monomer is pyrrole or a derivative thereof (hereinafter sometimes referred to as “pyrrole monomer”). And is used as a mixture of a thiophene monomer and a pyrrole monomer because the reaction rate at the time of polymerization is improved, and thereby the ESR of the electrolytic capacitor can be further reduced.
- the amount of the pyrrole monomer added to the thiophene monomer is 1 to 100% of the pyrrole monomer based on the mass of the thiophene monomer (that is, the thiophene monomer).
- the pyrrole monomer is preferably 1 to 100 parts by mass based on 100 parts by mass of the monomer), more preferably 5 to 50%, still more preferably 10 to 30%.
- the addition amount of the pyrrole monomer is 1 to 100% on a mass basis with respect to the thiophene monomer.
- the pyrrole monomer is added to the thiophene monomer in the mixture of the thiophene monomer and the pyrrole monomer. It means 1 to 100% by mass based on the monomer. And when the addition amount of the pyrrole monomer is larger than the above, the property of the thiophene monomer that the ESR of the thiophene monomer is low and an electrolytic capacitor excellent in heat resistance is easily obtained is impaired by the pyrrole monomer, As a result, the ESR of the electrolytic capacitor may be increased and the heat resistance may be deteriorated.
- the monomer liquid for producing a conductive polymer according to the present invention has at least one selected from the group consisting of a naphthalenesulfonic acid heterocyclic compound and a benzenesulfonic acid heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus dispersed in the monomer.
- a naphthalenesulfonic acid heterocyclic compound and a benzenesulfonic acid heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus dispersed in the monomer since the dispersion looks almost transparent to the naked eye, some of the above-mentioned naphthalene sulfonic acid type heterocyclic compounds and benzene sulfonic acid type heterocyclic compounds are dissolved in the monomer. it is conceivable that. And the dispersion
- the monomer liquid for producing the conductive polymer of the present invention at least one selected from the group consisting of a monomer, a naphthalenesulfonic acid-based heterocyclic compound, and a benzenesulfonic acid-based heterocyclic compound having no hydroxyl group directly bonded to the benzene nucleus
- the mass ratio is preferably 1: 0.1 to 0.1: 1, more preferably 1: 0.3 to 0.3: 1, and 1: 0.5 to 0.5: 1. Further preferred.
- the ratio of at least one selected from the group consisting of the naphthalene sulfonic acid-based heterocyclic compound and the benzene sulfonic acid-based heterocyclic compound to the monomer is less than the above, since the dopant component is small, the desired conductivity
- the ratio of at least one selected from the group consisting of the naphthalenesulfonic acid heterocyclic compound and the benzenesulfonic acid heterocyclic compound relative to the monomer is greater than the above, the monomer component Therefore, the amount of the obtained conductive polymer may be reduced.
- the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound have dispersibility with respect to the monomers themselves, and thus can be made into a dispersion without the presence of an organic solvent.
- the monomer liquid for producing the conductive polymer of the present invention can be composed of at least one selected from the group consisting of a monomer, the naphthalenesulfonic acid-based heterocyclic compound, and the benzenesulfonic acid-based heterocyclic compound.
- an alcohol having 1 to 4 carbon atoms such as methanol, ethanol, propanol, or butanol is added to the monomer solution for producing a conductive polymer, It is preferable to dilute the monomer solution for producing the conductive polymer with alcohol since the workability is improved. Further, when such an alcohol is included, at least one selected from the group consisting of the naphthalene sulfonic acid heterocyclic compound and the benzene sulfonic acid heterocyclic compound as a monomer in the presence of the alcohol. May be prepared as a monomer solution for producing a conductive polymer containing an alcohol having 1 to 4 carbon atoms.
- the leakage current of the electrolytic capacitor is further reduced and short circuit failure It is preferable because the generation of can be reduced.
- Suitable examples of the compound having a glycidyl group include monoglycidyl compounds, diglycidyl compounds, glycerin triglycidyl ether, diglycerin tetraglycidyl ether, alcohol-soluble epoxy resins, alcohol-soluble polyglycerin polyglycidyl and ring-opening compounds thereof. It is mentioned as a thing.
- the ring-opening compound of the compound having a glycidyl group described above is a glycidyl compound having two or more glycidyl groups, and it is not necessary that all glycidyl groups are ring-opened. May be.
- silane compound examples include unsaturated hydrocarbon-containing alkoxysilane compounds or hydrolysates thereof, glycidyl group-containing alkoxysilane compounds or hydrolysates thereof, silane-modified resins, polysiloxanes, and the like.
- the compound having a glycidyl group include, for example, epoxy propanol (that is, glycidol), methyl glycidyl ether, ethyl glycidyl ether, propyl glycidyl ether, butyl glycidyl ether, epoxy butane (that is, glycidyl methane), Epoxy pentane (ie glycidyl ethane), epoxy hexane (ie glycidyl propane), epoxy heptane (ie glycidyl butane), epoxy octane (ie glycidyl pentane), glycidoxypropyltrimethoxysilane, glycidoxypropylmethyldimethoxy Silane, glycidoxypropyltriethoxysilane, glycidoxypropylmethyldiethoxysilane, glycidyl methacrylate,
- alcohol-soluble epoxy resin for example, a product commercially available from DIC under the trade name “Watersol BC-3010” can be suitably used.
- alcohol-soluble polyglycerin polyglycidyl for example, those commercially available from Sakamoto Yakuhin Kogyo under the trade name “SR-4GLS” can be preferably used.
- the ring-opening compound of the compound having the glycidyl group refers to a compound in which the glycidyl group in those compounds is ring-opened to become glycol as shown in the following formula.
- the above glycidyl group-containing compounds and ring-opening compounds thereof can be used alone or in combination of two or more.
- silane compound examples include 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyldimethylmethoxysilane, 3-methacryloxypropyldimethylethoxysilane, and 3-methacryloxy.
- At least one selected from the group consisting of a compound having a glycidyl group or a ring-opening compound thereof or a naphthalenesulfonic acid-based heterocyclic compound of a silane compound and a benzenesulfonic acid-based heterocyclic compound not having a hydroxyl group directly bonded to a benzene nucleus (Hereinafter, this may be simplified to be referred to as “organic sulfonic acid heterocyclic compound”).
- the addition amount is 5 to 500% on a mass basis (that is, glycidyl based on 100 parts by mass of the organic sulfonic acid heterocyclic compound).
- the compound having a group or its ring-opening compound or silane compound is preferably 5 to 500 parts by mass), and if the amount of the compound having a glycidyl group or its ring-opening compound or silane compound is less than the above, the leakage current is reduced. Not fully effective, and has a glycidyl group When the amount of compound or a ring-opened compound or a silane compound is larger than the above, small increase in effect with increasing amount, on which the cost is high, which may lower the reaction rate.
- the addition amount with respect to the said organic sulfonic acid heterocyclic compound of the compound which has this glycidyl group or its ring-opening compound, or a silane compound is 10% or more on a mass basis within the said range, and 100% or less is more preferable. More preferred.
- the leakage current is reduced based on the addition of the compound having a glycidyl group or the ring-opening compound or silane compound thereof.
- the effect of further suppressing the effect of suppressing the occurrence of short-circuit defects can be expected.
- the conductive polymer production monomer liquid of the present invention is used for producing a non-winding electrolytic capacitor such as a tantalum electrolytic capacitor, a niobium electrolytic capacitor, a laminated type or a flat plate type aluminum electrolytic capacitor
- a non-winding electrolytic capacitor such as a tantalum electrolytic capacitor, a niobium electrolytic capacitor, a laminated type or a flat plate type aluminum electrolytic capacitor
- the capacitor element for example, an element having a porous body of a valve metal such as tantalum, niobium, or aluminum to be an anode and a dielectric layer made of an oxide film of the valve metal is used.
- a capacitor element for example, a surface of a valve metal foil such as an aluminum foil is subjected to an etching treatment, and then a chemical conversion is performed.
- a lead terminal is attached to the anode formed with the dielectric layer made of the oxide film of the valve metal by processing, and the lead terminal is attached to the cathode made of the valve metal foil such as an aluminum foil.
- a wound type capacitor element produced by winding a cathode and a cathode through a separator is used.
- the capacitor element is impregnated with the monomer solution for producing a conductive polymer of the present invention.
- This impregnation is performed by immersing the capacitor element in the above-mentioned monomer solution for producing a conductive polymer, or applying the monomer solution for producing a conductive polymer to the capacitor element by spraying or the like.
- the monomer liquid for producing a conductive polymer is preferably in a diluted state by adding an alcohol having 1 to 4 carbon atoms as described above.
- the amount of the alcohol added may be determined according to the workability derived from the viscosity of the monomer solution for producing a conductive polymer, and is not particularly required to be specified. It is preferable that the total of the above monomers and at least one selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound be 20 to 85% by mass, and 30 to 80% by mass. % Is more preferable.
- the capacitor element is impregnated with the monomer solution for producing a conductive polymer of the present invention, dried, and then impregnated with an oxidant solution.
- the capacitor element is impregnated with the monomer liquid for producing the conductive polymer, for example, by immersing the capacitor element in the monomer liquid for producing the conductive polymer, the capacitor element is produced with the conductive polymer.
- the capacitor element is pulled out (taken out) from the monomer solution, dried, and then impregnated with an oxidant solution.
- the oxidizing agent examples include persulfates such as ammonium persulfate, sodium persulfate, potassium persulfate, calcium persulfate, and barium persulfate, and ammonium persulfate is particularly preferable.
- This solution of persulfate is usually carried out using water, and the concentration of persulfate in the solution is not particularly limited, but it is usually preferably 30 to 50% by mass. .
- the impregnation with the oxidant is performed by immersing the capacitor element after impregnating the monomer solution for producing the conductive polymer of the present invention in the oxidant solution or spraying the oxidant solution on the capacitor element. It is done by applying with. Then, after impregnation with the oxidant solution, the monomer is polymerized into a conductive polymer at room temperature (25 ° C.) or under heating. When the impregnation is performed by immersing the capacitor element in the oxidant solution, the monomer is polymerized at the room temperature or under heating after the capacitor element is drawn out (after being taken out) from the oxidant solution.
- the polymerization of the monomer is performed at room temperature, the polymerization is preferably performed at 25 ° C. for 60 to 120 minutes, and when the polymerization of the monomer is performed under heating, the polymerization is performed at 30 to 85 ° C. Polymerization is preferably performed by heating for about 30 to 60 minutes.
- a small amount of iron is added to the oxidant solution, the polymerization rate of the monomer can be improved.
- iron causes the leakage current of electrolytic capacitors to increase, it must be kept within a range that does not cause leakage current.
- the addition amount must be 5000 ppm or less, and the addition amount is 100 to 5000 ppm. Is preferable, and 300 to 1500 ppm is more preferable.
- the capacitor element is impregnated with the monomer solution for producing the conductive polymer of the present invention, the subsequent impregnation with the oxidant solution, and the polymerization of the monomer at least once, that is, the above process is required.
- a solid electrolyte layer made of a conductive polymer is formed on the capacitor element.
- the solid electrolyte layer made of the conductive polymer is formed on the dielectric layer on the surface of the valve metal that becomes the anode in the capacitor element.
- the conductive polymer may be attached to other parts of the capacitor element.
- the solid electrolyte layer is formed with carbon paste and silver paste.
- the electrolytic capacitor may be finished by coating, or the conductive polymer is further dispersed on the solid electrolyte layer made of the conductive polymer formed using the monomer liquid for manufacturing the conductive polymer of the present invention. You may finish as an electrolytic capacitor, after forming the solid electrolyte layer which consists of 1 layer or 2 layers or more of conductive polymers using a liquid. By doing so, it is possible to shorten the time for manufacturing the electrolytic capacitor and to further improve the heat resistance and moisture resistance.
- the solid electrolyte layer made of the conductive polymer using the monomer liquid for producing the conductive polymer of the present invention the solid electrolyte layer made of the conductive polymer using the dispersion liquid of the conductive polymer. May be formed.
- the capacitor element In impregnating the capacitor element into the monomer liquid for producing the conductive polymer of the present invention, for example, at least one selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound is dispersed. After immersing the capacitor element in a monomer or monomer solution (a monomer solution obtained by diluting the monomer with alcohol) and pulling it up from the monomer or monomer solution, the capacitor element is replaced with the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid system.
- a monomer or monomer solution a monomer solution obtained by diluting the monomer with alcohol
- the order of immersing the capacitor element in the liquid is reversed (that is, the capacitor element is first converted into at least one dispersion selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound.
- the capacitor element is immersed in a monomer or a monomer solution
- a dispersion containing at least one selected from the group consisting of compounds is constituted, it is also included in the scope of the present invention.
- the capacitor element is immersed in the monomer solution, pulled up from the monomer solution, and dried, and the monomer itself is in a liquid state. Therefore, in the state where the liquid monomer is impregnated in the capacitor element, the capacitor element is inserted into the naphthalene.
- a dispersion liquid containing at least one selected from the group consisting of a sulfonic acid-based heterocyclic compound and a benzenesulfonic acid-based heterocyclic compound When immersed in a dispersion liquid containing at least one selected from the group consisting of a sulfonic acid-based heterocyclic compound and a benzenesulfonic acid-based heterocyclic compound, a monomer and the naphthalenesulfonic acid-based heterocyclic ring inside or on the capacitor element A dispersion liquid containing at least one selected from the group consisting of a compound and a benzenesulfonic acid-based heterocyclic compound is formed, and this also has the same structure as the monomer liquid for producing a conductive polymer of the present invention. Therefore, this case is also included in the scope of the present invention.
- the capacitor element is immersed in at least one dispersion selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound, pulled up from the dispersion, dried, and then dried to form the naphthalenesulfonic acid Even when at least one selected from the group consisting of a heterocyclic compound and a benzenesulfonic acid heterocyclic compound becomes solid, when the capacitor element is immersed in the monomer solution, the naphthalene sulfone once solidified Since at least one selected from the group consisting of an acid-based heterocyclic compound and a benzenesulfonic acid-based heterocyclic compound is dispersed in the monomer solution, the monomer and the naphthalenesulfonic acid-based complex are formed inside or on the capacitor element.
- a capacitor element that holds at least one selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound that is solidified by drying inside or on the capacitor element, Even when immersed in the monomer instead of being immersed in the monomer solution as described above, at least one selected from the group consisting of the naphthalenesulfonic acid-based heterocyclic compound and the benzenesulfonic acid-based heterocyclic compound once solidified Since the seeds are dispersed in the liquid monomer, the naphthalenesulfonic acid-based heterocyclic compound and benzenesulfone are used as the monomer in the capacitor element or on the capacitor element, similar to the monomer liquid for producing the conductive poly
- the capacitor element is immersed in at least one dispersion selected from the group consisting of a monomer, a monomer solution, the naphthalenesulfonic acid heterocyclic compound and a benzenesulfonic acid heterocyclic compound.
- a dispersion selected from the group consisting of a monomer, a monomer solution, the naphthalenesulfonic acid heterocyclic compound and a benzenesulfonic acid heterocyclic compound.
- these liquids are applied to the capacitor element by spraying or the like, and the capacitor element is impregnated with the solution.
- the dopant used in the synthesis of the conductive polymer in the preparation of the dispersion of the conductive polymer various existing ones can be used, particularly polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, Polymers such as copolymers of styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of methacrylic acid esters, acrylic acid esters and unsaturated hydrocarbon-containing alkoxysilane compounds or hydrolysates thereof A sulfonic acid polymer anion (polymeric sulfonic acid dopant) is preferred.
- the polystyrene sulfonic acid preferably has a weight average molecular weight of 10,000 to 1,000,000.
- the weight average molecular weight of the polystyrene sulfonic acid when the weight average molecular weight of the polystyrene sulfonic acid is smaller than 10,000, the conductivity of the obtained conductive polymer may be lowered. Moreover, when the weight average molecular weight of the said polystyrene sulfonic acid is larger than 1,000,000, there exists a possibility that the viscosity of the dispersion liquid of a conductive polymer may become high and it may become difficult to use in preparation of an electrolytic capacitor.
- the polystyrene sulfonic acid has a weight average molecular weight within the above range, more preferably 20,000 or more, further preferably 40,000 or more, and more preferably 800,000 or less. More preferably, 300,000 or less.
- the sulfonated polyester is a polycondensation product of dicarboxybenzenesulfonic acid diester such as sulfoisophthalic acid ester or sulfoterephthalic acid ester and alkylene glycol in the presence of a catalyst such as antimony oxide or zinc oxide.
- the modified polyester preferably has a weight average molecular weight of 5,000 to 300,000.
- the weight average molecular weight of the sulfonated polyester when the weight average molecular weight of the sulfonated polyester is smaller than 5,000, the conductivity of the obtained conductive polymer may be lowered. Further, when the weight average molecular weight of the sulfonated polyester is larger than 300,000, the viscosity of the dispersion liquid of the conductive polymer is increased, which may make it difficult to use in the production of the electrolytic capacitor.
- the sulfonated polyester preferably has a weight average molecular weight within the above range of 10,000 or more, more preferably 20,000 or more, and more preferably 100,000 or less. 80,000 or less is more preferable.
- phenolsulfonic acid novolak resin for example, the following general formula (2) (Wherein R 1 is hydrogen or a methyl group)
- R 1 is hydrogen or a methyl group
- the phenolsulfonic acid novolak resin having a weight average molecular weight of 5,000 to 500,000 is preferable.
- the weight average molecular weight of the phenolsulfonic acid novolak resin when the weight average molecular weight of the phenolsulfonic acid novolak resin is less than 5,000, the conductivity of the obtained conductive polymer may be lowered. Moreover, when the weight average molecular weight of the said phenolsulfonic acid novolak resin is larger than 500,000, there exists a possibility that the viscosity of the dispersion liquid of a conductive polymer may become high, and it may become difficult to use in preparation of an electrolytic capacitor.
- the phenol sulfonic acid novolak resin preferably has a weight average molecular weight of 10,000 or more, more preferably 400,000 or less, and more preferably 80,000 or less. Further preferred.
- Polymer anions such as polystyrene sulfonic acid, sulfonated polyester, and phenol sulfonic acid novolak resin can be used alone or in combination of two or more.
- a copolymer of the styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of a methacrylic acid ester, an acrylic acid ester, an unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof (hereinafter, A conductive polymer obtained by oxidative polymerization of thiophene or a derivative thereof using a styrene sulfonic acid and a non-sulfonic acid monomer as a dopant) is highly conductive, Moreover, since it has excellent heat resistance, it is suitable for manufacturing an electrolytic capacitor having low ESR, high reliability under high temperature conditions, and low leakage current.
- a copolymer of the styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of a methacrylic acid ester, an acrylic acid ester, an unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof is synthesized.
- a monomer to be copolymerized with styrene sulfonic acid at least one selected from the group consisting of methacrylic acid ester, acrylic acid ester and unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof is used.
- Esters include, for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, hexyl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, diphenylbutyl methacrylate, methacrylate.
- hydroxyalkyl methacrylate such as hydroxybutyl, hydroxyhexyl methacrylate, hydroxystearyl methacrylate, hydroxypolyoxyethylene methacrylate, methoxyhydroxypropyl methacrylate, ethoxyhydroxypropyl methacrylate, dihydroxypropyl methacrylate, dihydroxybutyl methacrylate, etc.
- those having a glycidyl group such as glycidyl methacrylate and methyl glycidyl methacrylate have a structure containing a hydroxyl group by ring opening of the glycidyl group.
- alkyl it is preferable from the viewpoint of characteristics as a dopant when copolymerized with styrenesulfonic acid.
- acrylate ester examples include methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, stearyl acrylate, cyclohexyl acrylate, diphenylbutyl acrylate, dimethylaminoethyl acrylate, Acrylic acid such as diethylaminoethyl acrylate, sodium sulfohexyl acrylate, glycidyl acrylate, methyl glycidyl acrylate, hydroxyalkyl acrylate, ie hydroxymethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate Hydroxyalkyl and the like can be used, but hydroxymethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, The number of carbon atoms in the alkyl group, such as Le acid hydroxybutyl acrylate,
- those having a glycidyl group such as glycidyl acrylate and methyl glycidyl acrylate have a structure containing a hydroxyl group by ring opening of the glycidyl group.
- alkyl it is preferable from the viewpoint of characteristics as a dopant when copolymerized with styrenesulfonic acid.
- Examples of the unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof include, for example, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyldimethylmethoxysilane, 3- Methacryloxypropyldimethylethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-acryloxymethyldimethoxysilane, 3-acryloxymethyldiethoxysilane, 3-acryloxytriethoxysilane, p-styryltrimethoxysilane, p-styryltriethoxysilane, p-styrylmethyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxy Silane, can be used an unsaturated hydrocarbon containing alkoxysilane compound
- the unsaturated hydrocarbon-containing alkoxysilane compound is the above-mentioned 3-methacryloxypropyltrimethoxysilane
- the hydrolyzate of the unsaturated hydrocarbon-containing alkoxysilane compound is converted into a hydroxyl group by hydrolysis of the methoxy group.
- the resulting structure becomes 3-methacryloxypropyltrihydroxysilane, or silanes condense to form an oligomer, resulting in a compound having a structure in which a methoxy group that is not used in the reaction is a hydroxyl group .
- Examples of the unsaturated hydrocarbon-containing alkoxysilane compound include 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, p-styryltrimethoxysilane, vinyltrimethoxysilane, and the like. It is preferable from the standpoint of properties as a dopant when copolymerized.
- Styrene in a copolymer of this styrene sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of methacrylic acid esters, acrylic acid esters and unsaturated hydrocarbon-containing alkoxysilane compounds or hydrolysates thereof As a ratio of sulfonic acid and at least one non-sulfonic acid monomer selected from the group consisting of methacrylic acid ester, acrylic acid ester and unsaturated hydrocarbon-containing alkoxysilane compound or a hydrolyzate thereof, It is preferably 1: 0.01 to 0.1: 1.
- the molecular weight is preferably about 5,000 to 500,000 in terms of weight average molecular weight from the viewpoint of water solubility and characteristics as a dopant, and more preferably about 40,000 to 200,000 in terms of weight average molecular weight.
- a copolymer of this styrene sulfonic acid and a non-sulfonic acid monomer can also be used in combination with a high molecular sulfonic acid such as polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, or the like.
- a high molecular sulfonic acid such as polystyrene sulfonic acid, sulfonated polyester, phenol sulfonic acid novolak resin, or the like.
- a copolymer of at least one non-sulfonic acid monomer selected from the group consisting of a compound or a hydrolyzate thereof) and the like are all for water or a mixture of water and a water-miscible solvent. Therefore, oxidative polymerization is It is carried out in an aqueous solution.
- water-miscible solvent constituting the aqueous liquid examples include methanol, ethanol, propanol, acetone, acetonitrile, and the like.
- the mixing ratio of these water-miscible solvents with water is 50 in the entire aqueous liquid. The mass% or less is preferable.
- oxidative polymerization for synthesizing the conductive polymer, either chemical oxidative polymerization or electrolytic oxidative polymerization can be employed.
- persulfate is used as an oxidizing agent in performing chemical oxidative polymerization.
- the persulfate include ammonium persulfate, sodium persulfate, potassium persulfate, calcium persulfate, and barium persulfate. Is used.
- the conditions during the polymerization are not particularly limited, but the temperature during chemical oxidative polymerization is preferably 5 ° C. to 95 ° C., more preferably 10 ° C. to 30 ° C., and polymerization
- the time is preferably 1 hour to 72 hours, more preferably 8 hours to 24 hours.
- Electrolytic oxidation polymerization is be carried out even at a constant voltage at a constant current, for example, when performing electrolytic oxidation polymerization at a constant current, preferably 0.05mA / cm 2 ⁇ 10mA / cm 2 as the current value, 0.2 mA / cm 2 to 4 mA / cm 2 is more preferable.
- the voltage is preferably 0.5 V to 10 V, more preferably 1.5 V to 5 V.
- the temperature during the electrolytic oxidation polymerization is preferably 5 ° C to 95 ° C, particularly preferably 10 ° C to 30 ° C.
- the polymerization time is preferably 1 hour to 72 hours, more preferably 8 hours to 24 hours.
- ferrous sulfate or ferric sulfate may be added as a catalyst.
- the conductive polymer obtained as described above is obtained immediately after polymerization in a state of being dispersed in water or an aqueous liquid, and includes persulfate as an oxidizing agent, iron sulfate used as a catalyst, and decomposition products thereof. Contains. Therefore, it is preferable to remove the metal component with a cation exchange resin after the impurities are dispersed by applying a dispersion of the conductive polymer containing the impurities to a dispersing machine such as an ultrasonic homogenizer, a high-pressure homogenizer, or a planetary ball mill.
- a dispersing machine such as an ultrasonic homogenizer, a high-pressure homogenizer, or a planetary ball mill.
- the particle size of the conductive polymer measured by the dynamic light scattering method at this time is preferably 100 ⁇ m or less, more preferably 10 ⁇ m or less, 0.01 ⁇ m or more, and more preferably 0.1 ⁇ m or more.
- the ethanol precipitation method, ultrafiltration method, anion exchange resin, etc. are used to remove the oxidant and the catalyst generated by decomposition of the catalyst and, as will be described later, a conductivity improver and a binder are added as necessary. May be.
- the conductive polymer dispersion obtained as described above may contain a conductivity improver as described above.
- a conductivity improver is contained in the conductive polymer dispersion, the conductivity of the conductive polymer film obtained by drying the conductive polymer dispersion is improved.
- ESR of an electrolytic capacitor using the conductive polymer as an electrolyte can be lowered.
- conductivity improvers examples include high boiling points such as dimethyl sulfoxide, ⁇ -butyrolactone, sulfolane, N-methylpyrrolidone, dimethyl sulfone, ethylene glycol, diethylene glycol, and polyethylene glycol (for example, high boiling point of 150 ° C. or higher).
- Organic solvents and saccharides such as erythritol, glucose, mannose, and pullulan, and dimethyl sulfoxide and butanediol are particularly preferable.
- the addition amount of such a conductivity improver is 5 to 3,000% on a mass basis with respect to the conductive polymer in the dispersion (that is, the conductivity improver with respect to 100 parts by mass of the conductive polymer). Is preferably 5 to 3,000 parts by mass), particularly preferably 20 to 700%.
- the addition amount of the conductivity improver is less than the above, the effect of improving the conductivity is not sufficiently exhibited, and when the addition amount of the conductivity improver is more than the above, it takes time to dry the dispersion. Moreover, there is a possibility of causing a decrease in conductivity.
- the content of the conductive polymer in the dispersion affects the workability when the capacitor element is immersed in the conductive polymer dispersion and taken out, it is usually about 0.5 to 15% by mass. Is preferred. In other words, if the content of the conductive polymer is less than the above, it may take time to dry, and if the content of the conductive polymer is more than the above, the viscosity of the dispersion is high. Thus, workability in manufacturing the electrolytic capacitor may be reduced.
- the conductive polymer obtained by drying the conductive polymer dispersion thus obtained has high conductivity and excellent heat resistance based on the properties of the polymer anion used as a dopant in the synthesis. Therefore, when it is used as a solid electrolyte, it becomes a factor for obtaining an electrolytic capacitor having low ESR and high reliability when used under high temperature conditions.
- the capacitor element When the conductive polymer dispersion obtained as described above is used in the production of an electrolytic capacitor, the capacitor element is immersed in the conductive polymer dispersion, taken out (pulled up), and dried. The obtained conductive polymer is used as a solid electrolyte.
- the solid electrolyte layer made of the conductive polymer is formed on the solid electrolyte layer made of the conductive polymer previously formed using the monomer solution for producing the conductive polymer of the present invention.
- the conductive polymer may be attached to other parts of the capacitor element.
- the solid electrolyte layer made of the conductive polymer formed using the conductive polymer dispersion is ahead of the solid electrolyte layer made of the conductive polymer using the monomer solution for producing the conductive polymer of the present invention. You may form in. Further, instead of immersing the capacitor element in the conductive polymer dispersion liquid as described above, the conductive polymer dispersion liquid may be sprayed onto the capacitor element by spraying or the like.
- a binder may be added to the dispersion of the conductive polymer.
- binder for example, polyvinyl alcohol, polyurethane, polyester, acrylic resin, polyamide, polyimide, epoxy resin, polyacrylonitrile resin, polymethacrylonitrile resin, polystyrene resin, novolac resin, sulfonated polyallyl, sulfonated polyvinyl, Examples include sulfonated polystyrene and silane coupling agents, and polyester, polyurethane, acrylic resin, sulfonated polyallyl, sulfonated polyvinyl, sulfonated polystyrene and the like are preferable, and in particular, sulfonated polyallyl, sulfonated polyvinyl, and sulfonated polystyrene. If a sulfone group is added, the conductivity of the conductive polymer can be improved, which is more preferable.
- Examples are shown in Examples 1 to 20, Examples 41 to 49, and Examples 59 to 67 for monomer liquids for producing a conductive polymer, and Examples relating to electrolytic capacitors are Examples 21 to 40. Examples 50 to 58 and Examples 68 to 84 are shown.
- Example 1 100 g of ethylenedioxythiophene, 100 g of 2-methylimidazole naphthalenesulfonate and 60 g of ethanol were added to a beaker with a stirrer having an internal volume of 1 L, and stirred for 1 hour to prepare a monomer solution for producing a conductive polymer.
- the 2-methylimidazole naphthalene sulfonate is a compound belonging to a naphthalene monosulfonic acid type heterocyclic compound.
- Example 2 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1, except that the amount of 2-methylimidazole naphthalenesulfonate was changed from 100 g to 150 g.
- Example 3 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1, except that the amount of 2-methylimidazole naphthalenesulfonate was changed from 100 g to 50 g.
- Example 4 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 2-methylimidazole naphthalenetrisulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- the 2-methylimidazole naphthalene trisulfonate is a compound belonging to the naphthalene trisulfonic acid type heterocyclic compound.
- Example 5 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that the amount of 2-methylimidazole naphthalene trisulfonate was changed from 100 g to 150 g.
- Example 6 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that the amount of 2-methylimidazole naphthalene trisulfonate was changed from 100 g to 50 g.
- Example 7 The same as Example 1 except that 100 g of 2-ethyl-4-methylimidazole naphthalenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate, and 60 g of n-butanol was used instead of 60 g of ethanol. Operation was performed to prepare a monomer liquid for producing a conductive polymer.
- the above-mentioned 2-ethyl-4-methylimidazole naphthalenesulfonate is a compound belonging to the naphthalene monosulfonic acid type heterocyclic compound.
- Example 8 Example 1 except that 100 g of 2-ethyl-4-methylimidazole naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene sulfonate, and 60 g of n-butanol was used instead of 60 g of ethanol.
- a monomer solution for producing a conductive polymer was prepared by performing the above operations.
- the above-mentioned 2-ethyl-4-methylimidazole naphthalene trisulfonate is a compound belonging to the naphthalene trisulfonic acid type heterocyclic compound.
- Example 9 The same procedure as in Example 1 was carried out except that 50 g of 2-methylimidazole naphthalenesulfonate and 50 g of 2-methylimidazole naphthalenetrisulfonate were used instead of 100 g of 2-methylimidazole naphthalenesulfonate. A monomer solution for polymer production was prepared.
- Example 10 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 50 g of ethylenedioxythiophene and 50 g of butylated ethylenedioxythiophene were used instead of 100 g of ethylenedioxythiophene. did.
- Example 11 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 10 g of ethylenedioxythiophene and 90 g of ethylated ethylenedioxythiophene were used instead of 100 g of ethylenedioxythiophene. did.
- Example 12 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 2-methylimidazole benzenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- Example 13 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of toluenesulfonic acid 2-methylimidazole was used instead of 100 g of naphthalenesulfonic acid 2-methylimidazole.
- Example 14 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 2-methylimidazole methoxybenzenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- Example 15 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 2-methylimidazole nitrobenzenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- Example 16 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 2-methylimidazole cumene sulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- Example 17 Except for using 50 g of 2-methylimidazole naphthalenesulfonate and 50 g of 2-methylimidazole benzenesulfonate in place of 100 g of 2-methylimidazole naphthalenesulfonate, the same operation as in Example 1 was performed to obtain a high conductivity. A monomer solution for molecular production was prepared.
- Example 18 The same procedure as in Example 1 was conducted except that 50 g of 2-methylimidazole naphthalene trisulfonate and 50 g of 2-methylimidazole toluene sulfonate were used instead of 100 g of 2-methylimidazole naphthalenesulfonate. A monomer solution for polymer production was prepared.
- Example 19 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 13 except that 60 g of ethylenedioxythiophene and 40 g of butylated ethylenedioxythiophene were used instead of 100 g of ethylenedioxythiophene. did.
- Example 20 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 16 except that 100 g of ethylated ethylenedioxythiophene was used instead of 100 g of ethylenedioxythiophene.
- Comparative Example 1 The same procedure as in Example 1 was performed except that 50 g of sodium naphthalenesulfonate was used in place of 100 g of 2-methylimidazole naphthalenesulfonate, and an attempt was made to prepare a monomer solution for producing a conductive polymer.
- Comparative Example 2 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 50 g of sodium naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene sulfonate.
- Comparative Example 3 The same procedure as in Example 1 was performed except that 50 g of 2-methylimidazole phenol sulfonate was used instead of 100 g of 2-methylimidazole naphthalene sulfonate, and an attempt was made to prepare a monomer solution for producing a conductive polymer. .
- Comparative Example 4 The same procedure as in Example 1 was performed except that 50 g of 2-methylimidazole anthraquinone sulfonate was used instead of 100 g of 2-methylimidazole naphthalene sulfonate, and an attempt was made to prepare a monomer solution for producing a conductive polymer. .
- anthraquinonesulfonic acid 2-methylimidazole was not dispersed at all, and a desired monomer liquid for producing a conductive polymer could not be prepared.
- Comparative Example 5 The same procedure as in Example 1 was carried out except that 50 g of sodium benzenesulfonate was used in place of 100 g of 2-methylimidazole naphthalenesulfonate, and an attempt was made to prepare a monomer solution for producing a conductive polymer.
- the electrolytic capacitors of Examples 21 to 40 were produced using the monomer liquids for producing conductive polymers of Examples 1 to 20, and the characteristics of the electrolytic capacitors were measured. The characteristics of the monomer liquid for producing conductive polymers are also evaluated.
- the reaction solution after the polymerization reaction is treated with an ultrafiltration device (Vivaflow 200 (trade name) manufactured by Sartorius, molecular weight fraction 50,000) to remove free low-molecular components in the solution, and water is added to the concentration.
- Vivaflow 200 (trade name) manufactured by Sartorius, molecular weight fraction 50,000
- the treated liquid is passed through a filter having a pore size of 1 ⁇ m, and the passing liquid is treated with an ultrafiltration apparatus (Vivaflow 200 (trade name), molecular weight fraction 50,000, manufactured by Sartorius Co., Ltd.). Ingredients were removed. 3 g of dimethyl sulfoxide was added to 50 g of a solution obtained by diluting the treated liquid with water to adjust the concentration to 2%, thereby obtaining a conductive polymer dispersion (I).
- an ultrafiltration apparatus Vivaflow 200 (trade name), molecular weight fraction 50,000, manufactured by Sartorius Co., Ltd.
- the mixture was diluted 4 times with water, and then dispersed for 30 minutes with an ultrasonic homogenizer (US-T300, manufactured by Nippon Seiki Co., Ltd.). Thereafter, 100 g of cation exchange resin Amberlite 120B (trade name) manufactured by Organo Corporation was added and stirred with a stirrer for 1 hour. Filtered on 131. This operation from dispersion to filtration was repeated three times to remove all cationic components.
- the above filtrate was passed through a filter having a pore size of 1 ⁇ m, and free low-molecular components were removed from the passing solution using an ultrafiltration device (Vivaflow 200 (trade name) manufactured by Sartorius, molecular weight fraction 50,000). 8 g of ethanol and 4 g of dimethyl sulfoxide were added to 40 g of a solution adjusted to a concentration of 5% by adding water to this solution, to obtain a conductive polymer dispersion (II).
- Example 21 As the capacitor element of the electrolytic capacitor of Example 21, a tantalum sintered body designed to have a rated voltage of 16 V, an ESR of 20 m ⁇ or less, a capacitance of 800 ⁇ F or more, and a leakage current of 100 ⁇ A or less was used.
- the capacitor element was dipped in the conductive polymer production monomer solution prepared in Example 1 for 2 minutes, pulled out, and dried at 50 ° C. for 10 minutes.
- the capacitor element was immersed in an aqueous solution of ammonium persulfate having a concentration of 35% for 2 minutes, pulled out, allowed to stand at room temperature (25 ° C.) for 10 minutes, and then heated at 50 ° C. for 30 minutes for polymerization. Thereafter, the capacitor element was immersed in a cleaning solution in which pure water and ethanol were mixed at a mass ratio of 1: 1 for 30 minutes, pulled out, and dried at 150 ° C. for 30 minutes. These operations were repeated 5 times to form a first solid electrolyte layer made of a conductive polymer on the capacitor element.
- the capacitor element was immersed in the conductive polymer dispersion (I) produced as described above for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes twice, as described above.
- the conductive polymer dispersion liquid (I) is formed on the first solid electrolyte layer made of the conductive polymer based on the polymerization of the monomer in the monomer liquid for conductive polymer production prepared in Example 1.
- a second solid electrolyte layer made of a conductive polymer based on immersion and drying hereinafter referred to simply as “second solid electrolyte layer based on conductive polymer dispersion (I)” was formed. .
- the capacitor element is immersed in the conductive polymer dispersion (II) for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes, based on the conductive polymer dispersion (I).
- a third solid electrolyte layer based on immersion and drying in a conductive polymer dispersion (II) on the second solid electrolyte layer [hereinafter referred to as “conductive polymer dispersion (II)”
- a tantalum electrolytic capacitor was manufactured by covering the solid electrolyte layer with carbon paste and silver paste.
- Example 22 to 40 The same procedure as in Example 21 was conducted except that the monomer solutions for producing conductive polymer prepared in Examples 2 to 20 were used separately in place of the monomer solution for producing conductive polymer prepared in Example 1. The operation was performed to manufacture tantalum electrolytic capacitors of Examples 22 to 40.
- Comparative Example 6 A capacitor element similar to that in Example 21 was immersed in an ethanol solution of ethylenedioxythiophene having a concentration of 30% for 2 minutes, pulled out, and allowed to stand at room temperature for 10 minutes. Thereafter, the film was immersed in an ethanol solution of ferric paratoluenesulfonate having a concentration of 40% for 30 seconds, pulled out, allowed to stand at room temperature for 10 minutes, and then heated at 50 ° C. for 30 minutes for polymerization. Thereafter, the capacitor element was immersed in a cleaning solution in which pure water and ethanol were mixed at a mass ratio of 1: 1, allowed to stand for 30 minutes, and then pulled out and dried at 150 ° C. for 30 minutes. These operations were repeated 5 times to form a first solid electrolyte layer made of a conductive polymer on the capacitor element.
- Example 21 Thereafter, the same treatment as in Example 21 was performed, and the second solid electrolyte layer based on the conductive polymer dispersion (I) and the conductive polymer dispersion (II) on the first solid electrolyte layer.
- the third solid electrolyte layer based on (1) was sequentially formed, and then a coating treatment with a carbon paste and a silver paste was performed to manufacture a tantalum-based electrolytic capacitor.
- Comparative Example 7 A capacitor element similar to that in Example 21 was immersed in an ethylenedioxythiophene solution (ethanol solution) having a concentration of 35% for 1 minute, pulled out, and allowed to stand for 5 minutes. Thereafter, an oxidizing agent comprising a mixture prepared by previously mixing the capacitor element with a 50% phenol butylamine sulfonate aqueous solution (pH 5) and a 30% ammonium persulfate aqueous solution in a mass ratio of 1: 1. It was immersed in the cum dopant solution for 30 seconds, pulled out, and allowed to stand at room temperature for 10 minutes. Then, it superposed
- the capacitor element was immersed in a cleaning solution in which pure water and ethanol were mixed at a mass ratio of 1: 1, allowed to stand for 30 minutes, and then pulled out and dried at 150 ° C. for 30 minutes. These operations were repeated 5 times to form a first solid electrolyte layer made of a conductive polymer based on the chemical oxidative polymerization of ethylenedioxythiophene.
- the capacitor element was dipped in the conductive polymer dispersion (I) produced as described above for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes twice.
- a second solid electrolyte layer based on the conductive polymer dispersion (I) was formed on the solid electrolyte layer.
- the capacitor element is immersed in the conductive polymer dispersion (II) produced as described above for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes to conduct the conductive polymer dispersion.
- a third solid electrolyte layer based on the conductive polymer dispersion (II) was formed on the second solid electrolyte layer based on (I).
- the solid electrolyte layer was covered with carbon paste and silver paste to manufacture a tantalum-based electrolytic capacitor.
- Comparative Example 8 A capacitor element similar to that of Example 21 was immersed in an ethanol solution (pH 5 to 6) of 2-methylimidazole naphthalenesulfonate having a concentration of 50% for 1 minute, then pulled up and left at room temperature for 5 minutes. Thereafter, the capacitor element was immersed in a 45% ammonium persulfate aqueous solution prepared in advance for 30 seconds, then pulled up and left at room temperature for 10 minutes. Thereafter, the capacitor element was immersed in ethylenedioxythiophene (100% ethylenedioxythiophene) for 5 seconds, then pulled up and allowed to stand at room temperature for 60 minutes to polymerize ethylenedioxythiophene.
- the capacitor element was immersed in pure water for 30 minutes, then pulled up and dried for 30 minutes. These operations were repeated five times to form a first solid electrolyte layer made of a conductive polymer by chemical oxidative polymerization of ethylenedioxythiophene on the capacitor element.
- the capacitor element was immersed in the conductive polymer dispersion (I) produced as described above for 1 minute, then pulled out and dried at 150 ° C. for 30 minutes twice.
- a second solid electrolyte layer based on the dispersion liquid (I) of the conductive polymer was formed on the first solid electrolyte layer composed of the conductive polymer based on chemical oxidation polymerization of thiophene.
- the capacitor element was immersed in the conductive polymer dispersion (II) produced as described above for 1 minute, then pulled out and dried at 150 ° C. for 30 minutes to disperse the conductive polymer.
- a third solid electrolyte layer based on the conductive polymer dispersion (II) was formed on the second solid electrolyte layer based on the liquid (I).
- the solid electrolyte layer was covered with carbon paste and silver paste to manufacture a tantalum-based electrolytic capacitor.
- ESR Using an LCR meter (4284A) manufactured by HEWLETT PACKARD, measurement is performed at 100 kHz under the condition of 25 ° C.
- Capacitance Using an LCR meter (4284A) manufactured by HEWLETT PACKARD, measurement is performed at 120 Hz under the condition of 25 ° C.
- Leak current A voltage of 16 V is applied to the electrolytic capacitor at 25 ° C. for 60 seconds, and then the leakage current is measured with a digital oscilloscope.
- the above measurement is performed for each sample for 10 samples, and the numerical values shown in Table 1 for ESR are obtained by calculating the average value of the 10 measured values and rounding off to the first decimal place.
- the numerical values shown in Table 1 regarding the capacitance and leakage current are obtained by calculating an average value of the ten measured values and rounding off the decimals.
- the type of the monomer liquid for producing a conductive polymer used in Examples 21 to 40 is indicated by its example number. In Table 1, the “type of monomer liquid for producing conductive polymer” is simplified and shown as “type of monomer liquid” in terms of space.
- tantalum-based electrolytic capacitors of Examples 21 to 40 and Comparative Examples 6 to 8 after the measurement of the initial characteristics shown in Table 1 above were stored in a stationary state in a dryer at 150 ° C. for 240 hours.
- ESR, capacitance, and leakage current were measured in the same manner as described above.
- the results are shown in Table 2 in the same manner as in Table 1 above.
- the tantalum-based electrolytic capacitors of Examples 21 to 40 have an ESR of 11.4 to 14.8 m ⁇ . Satisfying the set ESR of 20 m ⁇ or less, the leakage current of 3 to 9 ⁇ A, satisfying the set leakage current of 100 ⁇ A or less, the capacitance of 842 to 901 ⁇ F, satisfying the set capacitance of 800 ⁇ F or more, and Compared with the capacitors of Comparative Examples 6 to 8, the ESR is low (small), the capacitance is larger than that of the capacitors of Comparative Examples 6 to 8, and the leakage current is equal to that of the capacitors of Comparative Examples 6 to 8. Less than that, there was no significant deterioration in the properties of these.
- the capacitors of Examples 21 to 40 have little increase in ESR and leakage current, little reduction in capacitance even after storage for 240 hours at 150 ° C., and ESR is 11.8. ⁇ 16.3 m ⁇ satisfying the set ESR of 20 m ⁇ or less, the capacitance is 840 to 898 ⁇ F, satisfying the set capacitance of 800 ⁇ F or more, the leakage current is 5 to 17 ⁇ A, and 100 ⁇ A or less The set leakage current was satisfied.
- the capacitor of Comparative Example 6 uses ferric paratoluenesulfonate as an oxidizing agent and a dopant in forming the first solid electrolyte layer. Therefore, even in the initial characteristics, as shown in Table 1, based on the iron of the oxidant, the leakage current is large, and some of the short-circuiting occurred during the measurement of the leakage current. There were two of them. In addition, as shown in Table 2, after the capacitor of Comparative Example 6 was stored at 150 ° C. for 240 hours, the increase in ESR, leakage current, and the decrease in capacitance were larger than those of Examples 21 to 40, The heat resistance was poor.
- the capacitor of Comparative Example 7 uses a non-ferrous salt-based oxidant / dopant in the synthesis of the conductive polymer constituting the first solid electrolyte layer, in the initial characteristics, as shown in Table 1, Although the leakage current is not large, the capacitance is small compared to the capacitors of Examples 21 to 40, and after storage for 240 hours at 150 ° C., as shown in Table 2, the increase in ESR and the capacitance There was room for improvement in terms of heat resistance.
- the synthesis of the conductive polymer composing the first solid electrolyte layer is performed by separating the dopant (that is, 2-methylimidazole naphthalenesulfonate) and the monomer (that is, ethylenedioxythiophene).
- the dopant and the oxidizing agent ammonium persulfate are made into separate solutions, the capacitor element is immersed in the dopant solution, then immersed in the oxidizing agent solution, and then immersed in the monomer. Therefore, in the initial characteristics, as shown in Table 1, the capacitance is much smaller than the capacitors of Examples 21 to 40, and after storage for 240 hours at 150 ° C.
- the capacitance was greatly reduced, and the heat resistance was problematic. This is considered to be because the dopant and the oxidant react on the surface of the capacitor element to form a salt, so that it is difficult for the monomer in addition to the dopant and the oxidant to enter the capacitor element.
- Example 41 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of 4-methylimidazole naphthalenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate.
- Example 42 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of naphthalenesulfonic acid triazole was used instead of 100 g of 2-methylimidazole of naphthalenesulfonic acid.
- Example 43 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that 100 g of imidazole naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate.
- Example 44 All the examples except that 100 g of 1-methylimidazole naphthalenetrisulfonate was used instead of 100 g of 2-methylimidazole naphthalenetrisulfonate, and 10 g of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane was further added.
- a monomer solution for producing a conductive polymer was prepared in the same manner as in No. 4.
- Example 45 In place of 100 g of 2-methylimidazole naphthalenetrisulfonate, 100 g of 2-methyl-4-ethylimidazole naphthalenetrisulfonate was used, and in place of 100 g of ethylenedioxythiophene, 100 g of ethylated ethylenedioxythiophene was used. Furthermore, a monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that 5 g of polysiloxane was added.
- Example 46 In place of 100 g of 2-methylimidazole naphthalenetrisulfonate, 100 g of triazine naphthalenetrisulfonate is used, and in place of 100 g of ethylenedioxythiophene, 50 g of butylated ethylenedioxythiophene and 50 g of ethylenedioxythiophene are used, Further, a monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that 10 g of glycidyl methacrylate was added.
- Example 47 All the examples except that 100 g of naphthalene trisulfonic acid 2-methylimidazole was used instead of 100 g of naphthalene trisulfonic acid pyridine, and 8 g of 3-glycidoxypropyltrimethoxysilane and 8 g of polyethylene glycol diglycidyl ether were added. 45. A monomer solution for producing a conductive polymer was prepared in the same manner as in No. 45.
- Example 48 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 45 except that 100 g of morpholine naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate.
- Example 49 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 45 except that 100 g of piperazine naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate.
- Examples 50-58 The same procedure as in Example 21 was conducted except that the monomer solutions for producing conductive polymer prepared in Examples 41 to 49 were used separately in place of the monomer solution for producing conductive polymer prepared in Example 1. The operation was performed to manufacture tantalum electrolytic capacitors of Examples 50 to 58.
- the tantalum-based electrolytic capacitors of Examples 50 to 58 after the measurement of the initial characteristics shown in Table 3 were stored in a stationary state in a dryer at 150 ° C. for 240 hours. Similarly, ESR, capacitance and leakage current were measured. The results are shown in Table 4 in the same manner as in Table 3.
- the tantalum-based electrolytic capacitors of Examples 50 to 58 have an ESR of 11.7 to 13.5 m ⁇ , Satisfies the set ESR of 20 m ⁇ or less, the capacitance is 849 to 900 ⁇ F, satisfies the set capacitance of 800 ⁇ F or more, the leakage current is 1 to 9 ⁇ A, satisfies the setting leakage current of 100 ⁇ A or less, and Compared with the capacitor of Comparative Example 6 shown in Table 1, the ESR was low (small), the capacitance was large, and the leakage current was much smaller.
- the capacitors of Examples 50 to 58 show little increase in ESR and leakage current, little decrease in capacitance even after storage for 240 hours at 150 ° C., and ESR is 12.2 14.1 m ⁇ satisfying the set ESR of 20 m ⁇ or less, the capacitance is 840 to 895 ⁇ F, satisfying the set capacitance of 800 ⁇ F or more, and the leakage current is 1 to 18 ⁇ A, which is 100 ⁇ A or less The set leakage current was satisfied.
- Example 59 A monomer for producing a conductive polymer in the same manner as in Example 1 except that 100 g of 4-methylimidazole naphthalenesulfonate was used instead of 100 g of 2-methylimidazole naphthalenesulfonate and 7 g of pyrrole was further added. A liquid was prepared. The amount of pyrrole added to the thiophene monomer was 7%.
- the monomer in the monomer liquid for producing a conductive polymer of Example 59 is a mixture of ethylenedioxythiophene and pyrrole, and the content of pyrrole in this mixture is more apparent than the amount of pyrrole added, 7% with respect to ethylenedioxythiophene.
- Example 60 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 1 except that 100 g of naphthalenesulfonic acid triazole was used instead of 100 g of 2-methylimidazole naphthalenesulfonic acid and 20 g of pyrrole was further added. did. The amount of pyrrole added to the thiophene monomer was 20%.
- Example 61 The same procedure as in Example 4 was repeated except that 100 g of imidazole naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate and 10 g of pyrrole was added. Was prepared. The amount of pyrrole added to the thiophene monomer was 10%.
- Example 62 Instead of 100 g of 2-methylimidazole naphthalene trisulfonate, 100 g of 1-methylimidazole naphthalene trisulfonate was used, 20 g of pyrrole was added, and 10 g of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane was added. Except for the addition, the same operation as in Example 4 was performed to prepare a monomer liquid for producing a conductive polymer. The amount of pyrrole added to the thiophene monomer was 20%.
- Example 63 In place of 100 g of 2-methylimidazole naphthalenetrisulfonate, 100 g of 2-methyl-4-ethylimidazole naphthalenetrisulfonate was used, and in place of 100 g of ethylenedioxythiophene, 100 g of ethylated ethylenedioxythiophene was used. Further, a monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that 25 g of pyrrole and 5 g of polysiloxane were added. The amount of pyrrole added to the thiophene monomer was 25%.
- Example 64 In place of 100 g of 2-methylimidazole naphthalenetrisulfonate, 100 g of triazine naphthalenetrisulfonate is used, and in place of 100 g of ethylenedioxythiophene, 50 g of butylated ethylenedioxythiophene and 50 g of ethylenedioxythiophene are used.
- a monomer solution for producing a conductive polymer was prepared in the same manner as in Example 4 except that 30 g of pyrrole and 10 g of glycidyl methacrylate were added. The amount of pyrrole added to the thiophene monomer was 30%.
- Example 65 All the examples except that 100 g of naphthalene trisulfonic acid 2-methylimidazole was used instead of 100 g of naphthalene trisulfonic acid pyridine, and 8 g of 3-glycidoxypropyltrimethoxysilane and 8 g of polyethylene glycol diglycidyl ether were added.
- a monomer solution for producing a conductive polymer was prepared in the same manner as in No. 63. The amount of pyrrole added to the thiophene monomer was 25%.
- Example 66 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 63 except that 100 g of morpholine naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate. The amount of pyrrole added to the thiophene monomer was 25%.
- Example 67 A monomer solution for producing a conductive polymer was prepared in the same manner as in Example 63 except that 100 g of piperazine naphthalene trisulfonate was used instead of 100 g of 2-methylimidazole naphthalene trisulfonate. The amount of pyrrole added to the thiophene monomer was 25%.
- Examples 68-76 The same procedure as in Example 21 was conducted except that the monomer solution for producing conductive polymer prepared in Examples 59 to 67 was used separately in place of the monomer solution for producing conductive polymer prepared in Example 1. Operation was performed to manufacture tantalum-based electrolytic capacitors of Examples 68 to 76.
- tantalum electrolytic capacitors of Examples 68 to 76 after the measurement of the initial characteristics shown in Table 5 above were stored in a dryer at 150 ° C. for 240 hours, and the capacitors after the storage were Similarly, ESR, capacitance and leakage current were measured. The results are shown in Table 6 in the same manner as in Table 5 above.
- the tantalum-based electrolytic capacitors of Examples 68 to 76 have an ESR of 11.0 to 13.3 m ⁇ . Satisfying the set ESR of 20 m ⁇ or less, the capacitance of 860 to 907 ⁇ F, the set capacitance of 800 ⁇ F or more, the leakage current of 1 to 9 ⁇ A and the setting leakage current of 100 ⁇ A or less, and Compared with the capacitor of Comparative Example 6 shown in Table 1, the ESR was low (small), the capacitance was large, and the leakage current was much smaller.
- the capacitors of Examples 68 to 76 showed little increase in ESR and leakage current, little decrease in capacitance even after storage for 240 hours at 150 ° C., and ESR was 11.5. 13.9 m ⁇ satisfying the set ESR of 20 m ⁇ or less, the capacitance is 852 to 902 ⁇ F, satisfying the set capacitance of 800 ⁇ F or more, the leakage current is 1 to 14 ⁇ A and 100 ⁇ A or less The set leakage current was satisfied.
- the capacitors of Examples 68 to 76 do not have a significant increase in ESR or leakage current or a significant decrease in capacitance due to high-temperature storage as in the capacitor of Comparative Example 6, and compared with the capacitor of Comparative Example 7. Also, the increase in ESR due to high-temperature storage was small, and the capacitance decreased due to high-temperature storage was small compared to the capacitor of Comparative Example 8.
- the monomer liquids for producing conductive polymers of Examples 59 to 67 used in the capacitors of Examples 68 to 76 were the same as those of Examples 41 to 49 used in the capacitors of Examples 50 to 58. Although the pyrrole is added to the monomer solution for producing the high molecular weight polymer, the capacitors of Examples 68 to 76 have an ESR higher than that of the corresponding capacitors of Examples 50 to 58. Low and excellent capacitor characteristics.
- the monomer liquid for producing a conductive polymer of Example 59 (hereinafter sometimes referred to simply as “monomer liquid”) is obtained by adding pyrrole to the monomer liquid of Example 41.
- the capacitor of Example 68 using the monomer solution of Example 59 had lower ESR and superior capacitor characteristics than the capacitor of Example 50 using the monomer solution of Example 41.
- the monomer solution of Example 60 corresponds to the monomer solution of Example 42 added with pyrrole
- the monomer solution of Example 61 corresponds to the monomer solution of Example 43 added with pyrrole.
- the monomer solution of Example 62 corresponds to the monomer solution of Example 44 with pyrrole added
- the monomer solution of Example 63 corresponds to the monomer solution of Example 45 with pyrrole added thereto
- the monomer solution of Example 64 The liquid corresponds to a monomer liquid obtained by adding pyrrole to the monomer liquid of Example 46
- the monomer liquid of Example 65 corresponds to a liquid obtained by adding pyrrole to the monomer liquid of Example 47
- the monomer liquid of Example 66 corresponds to the Example.
- the monomer solution of Example 67 corresponds to the monomer solution of Example 49 added with pyrrole
- the monomer solution of Example 49 corresponds to the monomer solution of Example 49 added with pyrrole.
- Example 77 The capacitor element of the electrolytic capacitor of Example 77 is made of an aluminum foil having a porous surface portion, rated voltage of 25 V, ESR of 30 m ⁇ or less, capacitance of 40 ⁇ F or more, and leakage current of 20 ⁇ A or less. The one designed in this way was used.
- first solid electrolyte layer based on conductive polymer dispersion (I) was formed.
- the capacitor element was immersed in the monomer solution for producing a conductive polymer prepared in Example 2 for 2 minutes, pulled out, and dried at 50 ° C. for 10 minutes.
- the capacitor element was immersed in an aqueous solution of ammonium persulfate having a concentration of 35% for 2 minutes, pulled out, allowed to stand at room temperature (25 ° C.) for 10 minutes, and then heated at 50 ° C. for 30 minutes for polymerization. Thereafter, the capacitor element was immersed in a cleaning solution in which pure water and ethanol were mixed at a mass ratio of 1: 1 for 30 minutes, pulled out, and dried at 150 ° C. for 30 minutes. These operations were repeated twice to form a second solid electrolyte layer made of a conductive polymer based on the monomer solution for conductive polymer production of Example 1 on the capacitor element.
- the capacitor element is immersed in the conductive polymer dispersion (II) for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes, so that the conductive polymer is formed on the second solid electrolyte layer.
- a third solid electrolyte layer (hereinafter referred to as a “third solid electrolyte layer based on the conductive polymer dispersion (II)”), which is based on immersion in the dispersion (II) and drying. Formed.
- Example 77 An aluminum electrolytic capacitor of Example 77 was manufactured by covering the solid electrolyte layer with carbon paste and silver paste.
- Examples 78-84 Instead of the monomer liquid for producing conductive polymer prepared in Example 1, the monomer liquid for producing conductive polymer prepared in Examples 2, 4, 5, 59, 62, 63, and 64 was used separately. Except for the above, the same operation as in Example 77 was performed to manufacture aluminum electrolytic capacitors of Examples 78 to 84.
- Comparative Example 9 Except that the second solid electrolyte layer based on the monomer solution for conductive polymer production of Example 1 was not formed on the capacitor element, all operations were performed in the same manner as in Example 77. An electrolytic capacitor was manufactured.
- Comparative Example 10 The capacitor element on which the first solid electrolyte layer was formed by the same operation as in Example 77 was immersed in an ethanol solution of ethylenedioxythiophene having a concentration of 30% for 2 minutes, pulled out, and then allowed to stand at room temperature for 10 minutes. Thereafter, the film was immersed in an ethanol solution of ferric paratoluenesulfonate having a concentration of 40% for 30 seconds, pulled out, allowed to stand at room temperature for 10 minutes, and then heated at 50 ° C. for 30 minutes for polymerization. Thereafter, the capacitor element was immersed in a cleaning solution in which pure water and ethanol were mixed at a mass ratio of 1: 1, left for 30 minutes, and then pulled out and dried at 150 ° C. for 30 minutes. This operation was repeated twice to form a second solid electrolyte layer made of a conductive polymer produced using ferric paratoluenesulfonate as an oxidizing agent and a dopant on the capacitor element.
- the capacitor element is immersed in the conductive polymer dispersion (II) for 1 minute, pulled out, and then dried at 150 ° C. for 30 minutes to disperse the conductive polymer on the second solid electrolyte layer.
- a third solid electrolyte layer based on immersion in liquid (II) and drying (hereinafter referred to as “third solid electrolyte layer based on conductive polymer dispersion (II)”) was formed. .
- the aluminum electrolytic capacitors of Examples 77 to 84 have an ESR of 21.4 to 26.1 m ⁇ . Satisfies the set ESR of 30 m ⁇ or less, the capacitance is 41.1 to 41.4 ⁇ F, satisfies the set capacitance of 40 ⁇ F or more, the leak current is 1 to 12 ⁇ A, and the set leak current is 20 ⁇ A or less As compared with the capacitors of Comparative Examples 9 to 10, the ESR was low and the capacitor characteristics were excellent.
- the capacitors of Examples 77 to 84 show little increase in ESR and leakage current and little decrease in capacitance even after being stored at 150 ° C. for 240 hours, and the ESR is 21.9. 26.8 m ⁇ satisfying the set ESR of 30 m ⁇ or less, the capacitance is 40.5 to 41.1 ⁇ F, the set capacitance of 40 ⁇ F or more is satisfied, and the leakage current is 2 to 8 ⁇ A. The set leakage current of 20 ⁇ A or less was satisfied.
- Comparative Example 9 in which the second solid electrolyte layer made of the conductive polymer based on the monomer solution for manufacturing the conductive polymer of the present invention is not formed. Although this capacitor had a small leakage current, it had a higher ESR and a lower capacitance than the capacitors of Examples 77 to 84.
- the capacitor of Comparative Example 10 in which the second solid electrolyte layer was made of a conductive polymer produced using ferric paratoluenesulfonate as an oxidizing agent and dopant had a large leakage current, and had an ESR of high temperature storage.
- the increase, the increase in ESR, and the decrease in capacitance were large, and the increase in leakage current was particularly large.
- an electrolytic capacitor with low ESR, excellent heat resistance and low leakage current, and to provide a monomer solution for producing a conductive polymer that does not cause a problem with respect to its storage stability. Can do. And the electrolytic capacitor which has the said characteristic can be provided using the said monomer liquid for conductive polymer manufacture.
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Abstract
Description
上記シラン化合物も、それぞれ単独で用いることができるし、また、2種類以上を併用することもできる。
で表される繰り返し単位を有するものが好ましく、このようなフェノールスルホン酸ノボラック樹脂としては、その重量平均分子量が5,000~500,000のものが好ましい。
実施例1
内容積が1Lの攪拌機付きビーカーに、エチレンジオキシチオフェン100g、ナフタレンスルホン酸2-メチルイミダゾール100gおよびエタノール60gを添加し、1時間撹拌して、導電性高分子製造用モノマー液を調製した。上記ナフタレンスルホン酸2-メチルイミダゾールはナフタレンモノスルホン酸系複素環化合物に属する化合物である。
ナフタレンスルホン酸2-メチルイミダゾールの使用量を100gから150gに変更した以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾールの使用量を100gから50gに変更した以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。上記ナフタレントリスルホン酸2-メチルイミダゾールはナフタレントリスルホン酸系複素環化合物に属する化合物である。
ナフタレントリスルホン酸2-メチルイミダゾールの使用量を100gから150gに変更した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾールの使用量を100gから50gに変更した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸2-エチル-4-メチルイミダゾール100gを用い、エタノール60gに代えて、n-ブタノール60gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。上記ナフタレンスルホン酸2-エチル-4-メチルイミダゾールはナフタレンモノスルホン酸系複素環化合物に属する化合物である。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸2-エチル-4-メチルイミダゾール100gを用い、エタノール60gに代えて、n-ブタノール60gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。上記ナフタレントリスルホン酸2-エチル-4-メチルイミダゾールはナフタレントリスルホン酸系複素環化合物に属する化合物である。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸2-メチルイミダゾール50gとナフタレントリスルホン酸2-メチルイミダゾール50gとを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
エチレンジオキシチオフェン100gに代えて、エチレンジオキシチオフェン50gとブチル化エチレンジオキシチオフェン50gとを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
エチレンジオキシチオフェン100gに代えて、エチレンジオキシチオフェン10gとエチル化エチレンジオキシチオフェン90gとを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ベンゼンスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、トルエンスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、メトキシベンゼンスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ニトロベンゼンスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、キュメンスルホン酸2-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸2-メチルイミダゾール50gとベンゼンスルホン酸2-メチルイミダゾール50gとを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸2-メチルイミダゾール50gとトルエンスルホン酸2-メチルイミダゾール50gとを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
エチレンジオキシチオフェン100gに代えて、エチレンジオキシチオフェン60gとブチル化エチレンジオキシチオフェン40gとを用いた以外は、すべて実施例13と同様の操作を行って導電性高分子製造用モノマー液を調製した。
エチレンジオキシチオフェン100gに代えて、エチル化エチレンジオキシチオフェン100gを用いた以外は、すべて実施例16と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸ナトリウム50gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液の調製を試みた。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸ナトリウム50gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液の調製を試みた。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、フェノールスルホン酸2-メチルイミダゾール50gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液の調製を試みた。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、アントラキノンスルホン酸2-メチルイミダゾール50gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液の調製を試みた。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ベンゼンスルホン酸ナトリウム50gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液の調製を試みた。
内容積が2Lの攪拌機付きセパラブルフラスコに1Lの純水を入れ、そこにスチレンスルホン酸ナトリウム170gとアクリル酸ヒドロキシエチル30gとを添加した。そして、その溶液に酸化剤として過硫酸アンモニウムを1g添加して、スチレンスルホン酸とアクリル酸ヒドロキシエチルとの重合反応を12時間行った。この重合反応後の反応液を限外濾過装置〔ザルトリウス社製Vivaflow200(商品名)、分子量分画5万〕で処理して、液中の遊離の低分子成分を除去し、水を加えて濃度を3%に調整した。
3%スルホン化ポリエステル〔互応化学工業社製プラスコートZ-561(商品名)、重量平均分子量27,000〕水溶液200gを内容積1Lのビーカーに入れ、過硫酸アンモニウム2gを添加した後、スターラーで攪拌して溶解した。次いで、硫酸第二鉄の40%水溶液0.4gを添加し、攪拌しながら、その中にエチレンジオキシチオフェン3mLをゆっくり滴下し、24時間かけて、エチレンジオキシチオフェンの重合を行った。
この電解コンデンサでの評価(1)では、前記のように、実施例1~20の導電性高分子製造用モノマー液を用いて実施例21~40の電解コンデンサを製造し、その電解コンデンサの特性を測定することによって、上記実施例1~20の導電性高分子製造用モノマー液の特性も評価する。
この実施例21の電解コンデンサのコンデンサ素子としては定格電圧が16Vで、ESRが20mΩ以下、静電容量が800μF以上、漏れ電流が100μA以下になるよう設計したタンタル焼結体を用いた。
実施例1で調製した導電性高分子製造用モノマー液に代えて、実施例2~20で調製した導電性高分子製造用モノマー液をそれぞれ別々に用いた以外は、すべて実施例21と同様の操作を行って、実施例22~40のタンタル系の電解コンデンサを製造した。
実施例21と同様のコンデンサ素子を濃度が30%のエチレンジオキシチオフェンのエタノール溶液に2分間浸漬し、引き出した後、室温で10分間放置した。その後、濃度が40%のパラトルエンスルホン酸第二鉄のエタノール溶液に30秒間浸漬し、引き出した後、室温で10分間放置し、その後、50℃で30分間加熱して、重合を行った。その後、上記コンデンサ素子を純水とエタノールとを1:1の質量比で混合した洗浄液に浸漬し、30分間放置した後、引き出して150℃で30分間乾燥した。これらの操作を5回繰り返して、コンデンサ素子に導電性高分子からなる第1の固体電解質層を形成した。
濃度が35%のエチレンジオキシチオフェン溶液(エタノール溶液)に実施例21と同様のコンデンサ素子を1分間浸漬し、引き出した後、5分間放置した。その後、上記コンデンサ素子をあらかじめ用意しておいた濃度が50%のフェノールスルホン酸ブチルアミン水溶液(pH5)と濃度が30%の過硫酸アンモニウム水溶液とを1:1の質量比で混合した混合物からなる酸化剤兼ドーパント溶液中に30秒間浸漬し、引き出した後、室温で10分間放置した。その後、50℃で20分間加熱して、重合を行った。その後、上記コンデンサ素子を純水とエタノールとを1:1の質量比で混合した洗浄液に浸漬し、30分間放置した後、引き出して150℃で30分間乾燥した。これらの操作を5回繰り返して、上記エチレンジオキシチオフェンの化学酸化重合に基づく導電性高分子からなる第1の固体電解質層を形成した。
濃度が50%のナフタレンスルホン酸2-メチルイミダゾールのエタノール溶液(pH5~6)に実施例21と同様のコンデンサ素子を1分間浸漬した後、引き上げ、5分間室温で放置した。その後、上記コンデンサ素子をあらかじめ用意しておいた45%過硫酸アンモニウム水溶液に30秒間浸漬した後、引き上げ、室温で10分放置した。その後、上記コンデンサ素子をエチレンジオキシチオフェン(100%エチレンジオキシチオフェン)に5秒間浸漬した後、引き上げ、室温下で60分間放置してエチレンジオキシチオフェンを重合させた。その後、上記コンデンサ素子を純水に30分間浸漬した後、引き上げ、30分間乾燥した。これらの操作を5回繰り返して、コンデンサ素子に上記エチレンジオキシチオフェンの化学酸化重合による導電性高分子からなる第1の固体電解質層を形成した。
HEWLETT PACKARD社製のLCRメーター(4284A)を用い、25℃の条件下で、100kHzで測定する。
静電容量:
HEWLETT PACKARD社製のLCRメーター(4284A)を用い、25℃の条件下で、120Hzで測定する。
漏れ電流:
電解コンデンサに、25℃で16Vの電圧を60秒間印加した後、デジタルオシロスコープにて漏れ電流を測定する。
実施例41
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸4-メチルイミダゾール100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸トリアゾ-ル100gを用いた以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸イミダゾール100gを用いた以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸1-メチルイミダゾール100gを用い、さらに2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを10g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸2-メチル-4-エチルイミダゾール100gを用い、かつ、エチレンジオキシチオフェン100gに代えて、エチル化エチレンジオキシチオフェン100gを用い、さらにポリシロキサンを5g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸トリアジン100gを用い、かつ、エチレンジオキシチオフェン100gに代えて、ブチル化エチレンジオキシチオフェン50gとエチレンジオキシチオフェン50gとを用い、さらにメタクリル酸グリシジルを10g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸ピリジン100gを用い、さらに3-グリシドキシプロピルトリメトキシシランを8gとポリエチレングリコールジグリシジルエーテルを8g添加した以外は、すべて実施例45と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸モルホリン100gを用いた以外は、すべて実施例45と同様の操作を行って導電性高分子製造用モノマー液を調製した。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸ピペラジン100gを用いた以外は、すべて実施例45と同様の操作を行って導電性高分子製造用モノマー液を調製した。
この電解コンデンサでの評価(2)では、上記実施例41~49の導電性高分子製造用モノマー液を用いて実施例50~58の電解コンデンサを製造して、その特性を測定することによって、特性を評価する。
実施例1で調製した導電性高分子製造用モノマー液に代えて、実施例41~49で調製した導電性高分子製造用モノマー液をそれぞれ別々に用いた以外は、すべて実施例21と同様の操作を行って、実施例50~58のタンタル系の電解コンデンサを製造した。
実施例59
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸4-メチルイミダゾール100gを用い、さらにピロールを7g添加した以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は7%であった。この実施例59の導電性高分子製造用モノマー液におけるモノマーは、エチレンジオキシチオフェンとピロールとの混合物であり、この混合物中におけるピロールの含有量は、上記ピロールの添加量より明らかなように、エチレンジオキシチオフェンに対して7%である。
ナフタレンスルホン酸2-メチルイミダゾール100gに代えて、ナフタレンスルホン酸トリアゾール100gを用い、さらにピロールを20g添加した以外は、すべて実施例1と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は20%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸イミダゾール100gを用い、さらにピロールを10g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は10%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸1-メチルイミダゾール100gを用い、さらにピロールを20g添加し、かつ、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランを10g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は20%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸2-メチル-4-エチルイミダゾール100gを用い、かつ、エチレンジオキシチオフェン100gに代えて、エチル化エチレンジオキシチオフェン100gを用い、さらにピロールを25g添加し、かつポリシロキサンを5g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は25%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸トリアジン100gを用い、かつ、エチレンジオキシチオフェン100gに代えて、ブチル化エチレンジオキシチオフェン50gとエチレンジオキシチオフェン50gを用い、さらにピロールを30g添加し、かつ、メタクリル酸グリシジルを10g添加した以外は、すべて実施例4と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は30%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸ピリジン100gを用い、さらに3-グリシドキシプロピルトリメトキシシランを8gとポリエチレングリコールジグリシジルエーテルを8g添加した以外は、すべて実施例63と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は25%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸モルホリン100gを用いた以外は、すべて実施例63と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は25%であった。
ナフタレントリスルホン酸2-メチルイミダゾール100gに代えて、ナフタレントリスルホン酸ピペラジン100gを用いた以外は、すべて実施例63と同様の操作を行って導電性高分子製造用モノマー液を調製した。チオフェン系モノマーに対するピロールの添加量は25%であった。
実施例68~76
実施例1で調製した導電性高分子製造用モノマー液に代えて、実施例59~67で調製した導電性高分子製造用モノマー液をそれぞれ別々に用いた以外は、すべて実施例21と同様の操作を行って、実施例68~76のタンタル系の電解コンデンサを製造した。
この電解コンデンサの評価(4)では、平板型アルミニウム電解コンデンサを製造して、その特性を評価する。
この実施例77の電解コンデンサのコンデンサ素子としては、表面部が多孔質化したアルミニウム箔からなり、定格電圧が25Vで、ESRが30mΩ以下、静電容量が40μF以上、漏れ電流が20μA以下になるように設計したものを用いた。
実施例1で調製した導電性高分子製造用モノマー液に代えて、実施例2、4、5、59、62、63、64で調製した導電性高分子製造用モノマー液をそれぞれ別々に用いた以外は、すべて実施例77と同様の操作を行って、実施例78~84のアルミニウム系の電解コンデンサを製造した。
コンデンサ素子に実施例1の導電性高分子製造用モノマー液に基づく第2の固体電解質層を形成しなかった以外は、すべて実施例77と同様の操作を行って、比較例9のアルミニウム系の電解コンデンサを製造した。
実施例77と同様の操作で第1の固体電解質層を形成したコンデンサ素子を濃度が30%のエチレンジオキシチオフェンのエタノール溶液に2分間浸漬し、引き出した後、室温で10分間放置した。その後、濃度が40%のパラトルエンスルホン酸第二鉄のエタノール溶液に30秒間浸漬し、引き出した後、室温で10分間放置し、その後、50℃で30分間加熱して、重合を行った。その後、上記コンデンサ素子を純水とエタノールを1:1の質量比で混合した洗浄液に浸漬し、30分間放置した後、引き出して150℃で30分間乾燥した。この操作を2回繰り返して、コンデンサ素子にパラトルエンスルホン酸第二鉄を酸化剤兼ドーパントとして製造した導電性高分子からなる第2の固体電解質層を形成した。
Claims (15)
- チオフェンまたはその誘導体、ピロールまたはその誘導体およびアニリンまたはその誘導体よりなる群から選ばれる少なくとも1種のモノマーに、ナフタレンスルホン酸系複素環化合物およびベンゼン核に直結する水酸基を有しないベンゼンスルホン酸系複素環化合物よりなる群から選ばれる少なくとも1種が分散していることを特徴とする導電性高分子製造用モノマー液。
- ナフタレンスルホン酸系複素環化合物が、ナフタレンモノスルホン酸複素環化合物およびナフタレントリスルホン酸複素環化合物よりなる群から選ばれる少なくとも1種である請求項1記載の導電性高分子製造用モノマー液。
- ナフタレンスルホン酸系複素環化合物の複素環が、窒素原子を含むものである請求項1または2記載の導電性高分子製造用モノマー液。
- ナフタレンスルホン酸系複素環化合物における複素環化合物部分が、イミダゾール、1-メチルイミダゾール、2-メチルイミダゾール、4-メチルイミダゾール、2-エチル-4-メチルイミダゾール、2-メチル-4-エチルイミダゾール、トリアゾール、トリアジン、ピリジン、モルホリンおよびピペラジンよりなる群から選ばれる少なくとも1種である請求項1~3のいずれかに記載の導電性高分子製造用モノマー液。
- ベンゼンスルホン酸系複素環化合物が、ベンゼンスルホン酸複素環化合物、アルキル基を有するベンゼンスルホン酸複素環化合物、アルコキシ基を有するベンゼンスルホン酸複素環化合物およびニトロ基を有するベンゼンスルホン酸複素環化合物よりなる群から選ばれる少なくとも1種である請求項1記載の導電性高分子製造用モノマー液。
- ベンゼンスルホン酸系複素環化合物の複素環が、窒素原子を含むものである請求項1または5記載の導電性高分子製造用モノマー液。
- ベンゼンスルホン酸系複素環化合物における複素環化合物部分が、イミダゾール、1-メチルイミダゾール、2-メチルイミダゾール、4-メチルイミダゾール、2-エチル-4-メチルイミダゾール、2-メチル-4-エチルイミダゾール、トリアゾール、トリアジン、ピリジン、モルホリンおよびピペラジンよりなる群から選ばれる少なくとも1種である請求項1、5または6記載の導電性高分子製造用モノマー液。
- モノマーと、ナフタレンスルホン酸系複素環化合物およびベンゼン核に直結する水酸基を有しないベンゼンスルホン酸系複素環化合物よりなる群から選ばれる少なくとも1種との比率が、質量比で1:0.1~0.1:1である請求項1~7のいずれかに記載の導電性高分子製造用モノマー液。
- さらに、炭素数が1~4のアルコールを含む請求項1~8のいずれかに記載の導電性高分子製造用モノマー液。
- モノマーが、チオフェンまたはその誘導体である請求項1~9のいずれかに記載の導電性高分子製造用モノマー液。
- モノマーが、チオフェンまたはその誘電体に対してピロールまたはその誘導体を質量基準で1~100%含むチオフェンまたはその誘導体とピロールまたはその誘導体との混合物である請求項1~9のいずれかに記載の導電性高分子製造用モノマー液。
- コンデンサ素子に請求項1~12のいずれかに記載の導電性高分子製造用モノマー液を含浸した後、そのコンデンサ素子に酸化剤溶液を含浸し、モノマーの重合を行う工程を少なくとも1回経由して、導電性高分子からなる固体電解質層を形成することを特徴とする電解コンデンサの製造方法。
- コンデンサ素子に請求項13記載の方法により導電性高分子からなる固体電解質層を形成した後、導電性高分子の分散液を含浸し、乾燥する工程を少なくとも1回経由して、さらに導電性高分子からなる固体電解質層を形成することを特徴とする電解コンデンサの製造方法。
- コンデンサ素子に導電性高分子の分散液を含浸し、乾燥する工程を少なくとも1回経由して固体電解質層を形成した後、請求項13記載の方法により導電性高分子からなる固体電解質層を形成し、その後、導電性高分子の分散液を含浸し、乾燥する工程を少なくとも1回経由して、さらに導電性高分子からなる固体電解質層を形成することを特徴とする電解コンデンサの製造方法。
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JP2010090324A (ja) * | 2008-10-10 | 2010-04-22 | Tayca Corp | 導電性高分子用ドーパント溶液、導電性高分子用酸化剤兼ドーパント溶液、導電性組成物、固体電解コンデンサおよびその製造方法 |
WO2011068026A1 (ja) * | 2009-12-04 | 2011-06-09 | テイカ株式会社 | 導電性高分子およびそれを固体電解質として用いた固体電解コンデンサ |
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EP3228242A1 (en) * | 2016-04-05 | 2017-10-11 | AI Silk Corporation | Method and device for producing a conductive polymer conductor |
JP2021034684A (ja) * | 2019-08-29 | 2021-03-01 | テイカ株式会社 | 電解コンデンサおよびその製造方法 |
JP7357487B2 (ja) | 2019-08-29 | 2023-10-06 | テイカ株式会社 | 電解コンデンサおよびその製造方法 |
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JPWO2015037481A1 (ja) | 2017-03-02 |
US20160225531A1 (en) | 2016-08-04 |
CN105531298A (zh) | 2016-04-27 |
US10049822B2 (en) | 2018-08-14 |
CN105531298B (zh) | 2017-11-28 |
TWI607033B (zh) | 2017-12-01 |
JP5725637B1 (ja) | 2015-05-27 |
TW201529630A (zh) | 2015-08-01 |
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