WO2019044044A1 - 固体電解コンデンサの製造方法 - Google Patents
固体電解コンデンサの製造方法 Download PDFInfo
- Publication number
- WO2019044044A1 WO2019044044A1 PCT/JP2018/017998 JP2018017998W WO2019044044A1 WO 2019044044 A1 WO2019044044 A1 WO 2019044044A1 JP 2018017998 W JP2018017998 W JP 2018017998W WO 2019044044 A1 WO2019044044 A1 WO 2019044044A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- group
- dispersion
- conductive polymer
- electrolytic capacitor
- conjugated conductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- 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
- H01G9/0029—Processes of manufacture
- H01G9/0036—Formation of the solid electrolyte layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a method of manufacturing a solid electrolytic capacitor and a solid electrolytic capacitor obtained by the method of manufacturing the same.
- the solid electrolytic capacitor is manufactured by forming a dielectric oxide film on the metal surface by anodic oxidation and contacting the same with a solid electrolyte.
- a solid electrolytic capacitor using a conductive polymer as a solid electrolyte has been proposed.
- Aluminum, tantalum, niobium, etc. are known as an example of the metal covered with the dielectric oxide film by anodic oxidation.
- conductive polymers used for solid electrolytic capacitors conjugated conductive polymers such as polythiophene, polypyrrole, polyaniline, polyacetylene, polyphenylene, poly (p-phenylene-vinylene), polyacene, polythiophene vinylene and their derivatives are known. It is done.
- the technique which dopes a conjugated system conductive polymer is known, using polyanions, such as a polystyrene sulfonic acid, as a counter anion of the said conjugated system conductive polymer.
- the solid electrolyte is generally formed by chemical oxidation polymerization of a monomer solution and an oxidant solution for obtaining a conductive high molecular weight polymer on a dielectric oxide film formed on a metal surface having a valve action. Or formed by electrolytic polymerization.
- a method of forming a solid electrolyte by applying a conductive polymer aqueous solution or a suspension has been proposed. For example, in Japanese Patent Application Laid-Open No.
- Patent Document 1 a step of impregnating a capacitor element with a conductive polymer-dispersed aqueous solution in which fine particles of a conductive polymer are dispersed to form a first solid electrolyte layer Or by separately impregnating the surface of the first solid electrolyte layer with a solution containing a heterocyclic monomer and a solution containing an oxidizing agent, or a mixed solution containing a heterocyclic monomer and an oxidizing agent.
- a manufacturing method is disclosed which comprises the step of forming a second solid electrolyte layer by impregnation.
- JP 2005-109252 A discloses that a capacitor element in which a dielectric oxide film is formed on the surface of a sintered body formed by sintering valve metal powder is conductive by chemical polymerization of a polymerizable monomer. After forming a solid electrolyte layer comprising a polymer, the capacitor element is dipped in a conductive polymer solution, or a conductive polymer solution is applied and dried to form a conductive polymer layer by chemical polymerization. A method of forming a conductive polymer layer thick is disclosed.
- JP-A-2011-510141 US Pat. No. 872 1928
- patent document 3 discloses that poly (3,4-ethylenedioxythiophene) -polystyrene sulfonic acid is used to impregnate a conductive polymer into a capacitor.
- a process has been proposed in which the (PEDOT-PSS) dispersion is reduced in viscosity and polymerized using ultrasound irradiation.
- WO 2014/163202 discloses a dispersion medium containing a monomer for obtaining a conjugated conductive polymer and a seed particle protected by a polyanion and made into a protective colloid.
- a method and a solid electrolytic capacitor are disclosed in which a solid electrolytic capacitor excellent in capacitor characteristics can be produced with high productivity by the step of polymerizing a monomer to obtain a conjugated conductive polymer-containing dispersion.
- This solid electrolytic capacitor is characterized by using a conductive polymer, low equivalent series resistance (ESR), excellent frequency characteristics, and small characteristic change with temperature change.
- ESR equivalent series resistance
- solid electrolytic capacitors are expected to be applied to locations where the circuit peripheral temperature tends to rise, such as inverter power supplies and in-vehicle devices, and the high temperature stability and high temperature reliability of solid electrolytic capacitors become an issue There is.
- An object of the present invention is to provide a solid electrolytic capacitor having a high capacity development ratio (capacitance), excellent heat resistance, and high reliability under high temperature conditions.
- the present inventors have prepared a dispersion prepared by adding a morpholine compound to a conjugated conductive polymer dispersion used as a solid electrolyte of a solid electrolytic capacitor, that is, a morpholine compound and a conjugated conductive polymer. It is found that the above problem can be solved by forming a solid electrolyte layer by the step of attaching a dispersion containing coalesce to a porous electrode made of a valve metal having a dielectric film, and the present invention is completed. did. That is, the present invention relates to a method of manufacturing a solid electrolytic capacitor of the following [1] to [14] and a solid electrolytic capacitor.
- a conjugated conductive polymer is obtained by polymerizing a monomer for obtaining a conjugated conductive polymer in a dispersion medium containing seed particles protected by a polyanion, or in a dispersion medium containing a polyanion Step (A) of obtaining a united containing dispersion
- the conjugated conductive polymer-containing dispersion the following general formula (1) (Wherein, R 1 represents (1) a hydrogen atom, (2) a hydroxyl group, a cyano group, an alkyl group having 1 to 8 carbon atoms which may be substituted with an amino group, (3) a cycloalkenyl having 5 to 6 carbon atoms Alkenyl group, (4) amino group, phenyl group optionally substituted with cyano group, or formyl group, (5) acetyl group, (6) acetoacetyl group, (7) allyl group, (8) acroyl group, (9) represents a pyridyl group, (10) an alkyl group
- step (A) of obtaining the conjugated conductive polymer-containing dispersion liquid a seed further protected by a polyanion or a polyanion during polymerization of monomers for obtaining the conjugated conductive polymer
- the method for producing a solid electrolytic capacitor according to any one of the above 1 to 4 wherein a dispersion of particles is added.
- a monomer for obtaining the conjugated conductive polymer is represented by the following formula (2) (Wherein, R 2 and R 3 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 18 carbon atoms which may have a substituent, or a carbon number 1 to 18 which may have a substituent) Or an alkoxy group having 1 to 18 carbon atoms which may have a substituent, or an alkylthio group having 1 to 18 carbon atoms, or R 2 and R 3 bonded to each other to have a substituent and having 3 to 10 carbon atoms Alicyclic ring, aromatic ring having 6 to 10 carbon atoms which may have a substituent, oxygen atom-containing heterocyclic ring having 2 to 10 carbon atoms which may have a substituent, carbon number which may have a substituent The sulfur atom-containing heterocycle having 2 to 10, or the sulfur atom having a carbon number of 2 to 10, which may have a substituent, and an oxygen atom-containing heterocycle;
- a step of forming a solid electrolyte layer by attaching a dispersion prepared by adding a morpholine compound to a conjugated conductive polymer dispersion to a porous electrode body made of a valve metal having a dielectric film According to the method of manufacturing a solid electrolytic capacitor of the present invention, a solid electrolytic capacitor having a high capacity development ratio (capacitance), excellent heat resistance, and high reliability under high temperature conditions can be manufactured.
- the method for producing a solid electrolytic capacitor according to the present invention comprises a monomer for obtaining a conjugated conductive polymer in a dispersion medium containing seed particles protected with a polyanion by a protective colloid or in a dispersion medium containing a polyanion.
- a morpholine compound (described in detail below) represented by the general formula (1) is added to the conjugated conductive polymer-containing dispersion.
- a polyanion-protected seed particles particles in a state in which a polyanion is coordinated to the surface of a seed particle to form a protective colloid are referred to as "polyanion-protected seed particles".
- a polyanion means the polymer which has 2 or more of anionic groups.
- Step (A) for Obtaining a Conjugated Conductive Polymer-Containing Dispersion In the step (A) of obtaining a conjugated conductive polymer-containing dispersion, (1) in a dispersion medium containing a monomer for obtaining a conjugated conductive polymer and seed particles which are made protective colloid by a polyanion, Or (2) in the dispersion medium containing a monomer and a polyanion for obtaining a conjugated conductive polymer, the above-mentioned monomer is polymerized and carried out.
- the conjugated conductive polymer-containing dispersion (hereinafter sometimes referred to as “dispersion a”) in this step (A) is a composite of a conjugated conductive polymer and a seed particle protected by polyanion with a protective anion. At least one selected from a body or a complex of a conjugated conductive polymer and a polyanion is a dispersion liquid dispersed in a dispersion medium. In this step, the polyanion is considered to form a complex by doping the conjugated conductive polymer.
- the conjugated conductive polymer is not particularly limited as long as it is an organic polymer compound having a ⁇ conjugated system in the main chain.
- a conjugated conductive polymer compound for example, polypyrroles, polythiophenes, polyisothianaphthenes, polyacetylenes, polyphenylenes, polyphenylene vinylenes, polyanilines, polyacenes, polythiophene vinylenes, and copolymers thereof Etc.
- "class" in the conjugated system conductive polymer compound notation means the compound group containing the said compound structure, for example, polypyrroles refer to the compound group containing polypyrrole structure.
- conjugated conductive polymers polypyrroles, polythiophenes and polyanilines are preferable, and polythiophenes are more preferable. Further, from the viewpoint of obtaining high conductivity, a conjugated conductive polymer having a substituent such as an alkyl group, a carboxy group, a sulfo group, an alkoxyl group, a hydroxyl group or a cyano group is preferable. Specific examples of polypyrroles, polythiophenes and polyanilines which are preferable conjugated conductive polymers are shown below.
- polypyrrole polypyrrole, poly (N-methylpyrrole), poly (3-methylpyrrole), poly (3-ethylpyrrole), poly (3-n-propylpyrrole), poly (3-butylpyrrole), poly (3-Octylpyrrole), poly (3-decylpyrrole), poly (3-dodecylpyrrole), poly (3,4-dimethylpyrrole), poly (3,4-dibutylpyrrole), poly (3-carboxypyrrole) Poly (3-methyl-4-carboxypyrrole), poly (3-methyl-4-carboxyethylpyrrole), poly (3-methyl-4-carboxybutylpyrrole), poly (3-hydroxypyrrole), poly (3 -Methoxypyrrole), poly (3-ethoxypyrrole), poly (3-butoxypyrrole), poly (3-hexyloxypyridine) Lumpur), poly (3-methyl-4-hexyloxy-pyrrole) and poly (3-methyl-4-
- polythiophenes polythiophene, poly (3-methylthiophene), poly (3-hexylthiophene), poly (3-heptylthiophene), poly (3-octylthiophene), poly (3-decylthiophene), poly (3) -Dodecylthiophene), poly (3-octadecylthiophene), poly (3-bromothiophene), poly (3-chlorothiophene), poly (3-iodothiophene), poly (3-cyanothiophene), poly (3-phenyl) Thiophene), poly (3,4-dimethylthiophene), poly (3,4-dibutylthiophene), poly (3-hydroxythiophene), poly (3-methoxythiophene), poly (3-ethoxythiophene), poly (3) -Butoxythiophene), poly (3-hexyloxythiophene), poly ( -Heptyloxythiophene),
- polyanilines examples include polyaniline, poly (2-methylaniline), poly (3-isobutylaniline), poly (2-anilinesulfonic acid) and poly (3-anilinesulfonic acid).
- poly (3,4-ethylenedioxythiophene) (PEDOT) is more preferable because of its high conductivity and excellent heat resistance.
- the conjugated conductive polymers can be used singly or in combination of two or more.
- the monomer which is a constituent unit of the conjugated conductive polymer is selected from pyrrole which may have a substituent, aniline which may have a substituent, and thiophene which may have a substituent. Those containing one or more kinds are preferable.
- the substituent include an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 10 carbon atoms, a heteroaryl group having 5 to 10 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, and an alkylthio having 1 to 18 carbon atoms. Groups, carboxy groups, hydroxyl groups, halogen atoms and cyano groups.
- the alkyl group, the aryl group, the heteroaryl group, the alkoxy group and the alkylthio group may be substituted with one or more selected from a carboxy group, a hydroxyl group, a halogen atom or a cyano group.
- two or more of the substituents may be condensed to form a ring.
- the monomer examples include pyrrole, N-methylpyrrole, 3-methylpyrrole, 3-ethylpyrrole, 3-n-propylpyrrole, 3-butylpyrrole, 3-octylpyrrole, 3-decylpyrrole, 3 -Dodecylpyrrole, 3,4-dimethylpyrrole, 3,4-dibutylpyrrole, 3-carboxylpyrrole, 3-methyl-4-carboxylpyrrole, 3-methyl-4-carboxyethylpyrrole, 3-methyl-4-carboxybutyl Pyrrole, 3-hydroxypyrrole, 3-methoxypyrrole, 3-ethoxypyrrole, 3-butoxypyrrole, 3-hexyloxypyrrole, 3-methyl-4-hexyloxypyrrole, 3-methyl-4-hexyloxypyrrole;
- a compound represented by the following formula (2) is preferably included, and a compound represented by the following formula (3) is included. More preferably, 3,4-ethylenedioxythiophene is included.
- R 2 and R 3 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 18 carbon atoms which may have a substituent, a carbon which may have a substituent It represents an alkoxy group of the number 1 to 18 or an alkylthio group having a carbon number of 1 to 18 which may have a substituent.
- R 2 and R 3 are mutually bonded to form a ring, an optionally substituted alicyclic ring having 3 to 10 carbon atoms, an optionally substituted aromatic ring having 6 to 10 carbon atoms, A C2-C10 oxygen atom-containing heterocycle which may have a substituent, a C2-C10 sulfur atom containing heterocycle which may have a substituent, or a carbon which may have a substituent It represents a sulfur atom containing several 2 to 10 atoms and an oxygen atom-containing heterocycle.
- substituents examples include an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 10 carbon atoms, a heteroaryl group having 5 to 10 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, and an alkylthio having 1 to 18 carbon atoms.
- the above-mentioned alkyl group, aryl group, heteroaryl group, alkoxy group and alkylthio group may be substituted by a carboxy group, a hydroxyl group, a halogen atom or a cyano group.
- two or more substituents may be condensed to form a ring.
- Examples of the oxygen atom-containing heterocycle include an oxirane ring, an oxetane ring, a furan ring, a hydrofuran ring, a pyran ring, a pyrone ring, a dioxane ring and a trioxane ring.
- Examples of the sulfur atom-containing heterocyclic ring include thiirane ring, thietane ring, thiophene ring, thione ring, thiopyran ring, thiopyrilium ring, benzothiopyran ring, dithian ring, dithiolane ring, and trithian ring.
- Examples of the sulfur atom and oxygen atom-containing heterocycle include an oxathiolane ring and an oxathiane ring.
- R 4 and R 5 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may have a substituent, or R 4 and R 5 are bonded to each other And an oxygen atom-containing heterocycle having 3 to 6 carbon atoms which may have a substituent, which forms a ring.
- R 4 and R 5 are preferably an optionally substituted oxygen atom-containing heterocycle having 3 to 6 carbon atoms in which R 4 and R 5 are bonded to each other to form a ring.
- the oxygen atom-containing heterocycle include a dioxane ring and a trioxane ring, and a dioxane ring is preferable.
- substituents examples include an alkyl group having 1 to 18 carbon atoms, an aryl group having 6 to 10 carbon atoms, a heteroaryl group having 5 to 10 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, and an alkylthio having 1 to 18 carbon atoms.
- the alkyl group, aryl group, heteroaryl group, alkoxy group and alkylthio group may be substituted by a carboxy group, a hydroxyl group, a halogen atom or a cyano group.
- two or more substituents may be condensed to form a ring.
- the polyanion is a polymer having two or more anionic groups, is coordinated to the surface of the seed particle to form a protective colloid, and functions as a dopant to a conjugated conductive polymer.
- the anionic group include a group formed of sulfonic acid or a salt thereof, a group formed of phosphoric acid or a salt thereof, a monosubstituted phosphate ester group, a group formed of a carboxylic acid or a salt thereof, a monosubstituted sulfate ester group, etc.
- a strongly acidic group is preferable, a group consisting of sulfonic acid or its salt, and a group consisting of phosphoric acid or its salt are more preferable, and a group consisting of sulfonic acid or its salt is more preferable.
- the anionic group may be directly bonded to the main chain of the polymer or to a side chain. When the anionic group is bonded to the side chain, it is preferable that the anionic group be bonded to the end of the side chain because the doping effect is more pronounced.
- the polyanion may have a substituent other than an anionic group.
- a substituent an alkyl group, a hydroxyl group, an alkoxy group, a phenol group, a cyano group, a phenyl group, a hydroxyphenyl group, an ester group, a halogeno group, an alkenyl group, an imide group, an amide group, an amino group, an oxycarbonyl group, a carbonyl group Etc.
- an alkyl group, a hydroxyl group, a cyano group, a phenol group and an oxycarbonyl group are preferable, and an alkyl group, a hydroxyl group and a cyano group are more preferable.
- the substituent may be directly attached to the polymer main chain or may be attached to the side chain. In order to show the effect of each substituent when the substituent is attached to the side chain, the substituent is preferably attached to the end of the side chain.
- the alkyl group that can be substituted in the polyanion can be expected to have the effect of enhancing the solubility and dispersibility in the dispersion medium, the compatibility and the dispersibility with the conjugated conductive polymer, and the like.
- the alkyl group include a linear alkyl group such as methyl group, ethyl group, propyl group, butyl group, isobutyl group, t-butyl group, pentyl group, hexyl group, octyl group, decyl group and dodecyl group; cyclopropyl group, And cycloalkyl groups such as cyclopentyl and cyclohexyl.
- an alkyl group having 1 to 12 carbon atoms is more preferable.
- the hydroxyl group which can be substituted in the polyanion makes it easy to form a hydrogen bond with another hydrogen atom etc., and improves the solubility in the dispersion medium, the compatibility with the conjugated conductive polymer, the dispersibility, and the adhesiveness. It can be expected to work.
- the hydroxyl group is preferably bonded to the end of the alkyl group having 1 to 6 carbon atoms bonded to the polymer main chain.
- the cyano group and the hydroxyphenyl group which can be substituted in the polyanion can be expected to have the effect of enhancing the compatibility with the conjugated conductive polymer, the solubility in the dispersion medium, and the heat resistance.
- the cyano group is directly bonded to the polymer main chain, is bonded to the end of an alkyl group having 1 to 7 carbon atoms bonded to the polymer main chain, or is the end of an alkenyl group having 2 to 7 carbon atoms bonded to the polymer main chain Preferred is that bound to
- the oxycarbonyl group which can be substituted in the polyanion is preferably an alkyloxycarbonyl group, an aryloxycarbonyl group, an alkyloxycarbonyl group formed by interposing another functional group or an aryloxycarbonyl group directly bonded to the polymer main chain.
- composition of the polymer backbone of the polyanion is not particularly limited.
- examples of the polymer main chain include polyalkylenes, polyimides, polyamides, polyesters and the like. Among these, polyalkylenes are preferred from the viewpoint of synthesis and availability.
- Polyalkylenes are polymers composed of repeating units of ethylenically unsaturated monomers.
- the polyalkylene may have a carbon-carbon double bond in the main chain.
- the polyalkylene for example, polyethylene, polypropylene, polybutene, polypentene, polyhexene, polyvinyl alcohol, polyvinyl phenol, poly (3,3,3-trifluoropropylene), polyacrylonitrile, polyacrylate, polymethacrylate, polystyrene, polybutadiene, poly An isoprene etc. are mentioned.
- polyimide examples include pyromellitic dianhydride, biphenyltetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, 2,2,3,3-tetracarboxydiphenylether dianhydride, 2,2- [4,4 Include those obtained by the polycondensation reaction of acid anhydrides such as' -di (dicarboxyphenyloxy) phenyl] propane dianhydride with diamines such as oxydianiline, paraphenylene diamine, metaphenylene diamine, benzophenone diamine and the like .
- acid anhydrides such as' -di (dicarboxyphenyloxy) phenyl] propane dianhydride
- diamines such as oxydianiline, paraphenylene diamine, metaphenylene diamine, benzophenone diamine and the like .
- polyamide examples include polyamide 6, polyamide 6,6, polyamide 6,10 and the like.
- polyester examples include polyethylene terephthalate and polybutylene terephthalate.
- polysulfo group suitably used as a polyanion
- polyvinylsulfonic acid polystyrenesulfonic acid, polyallylsulfonic acid, polyacrylic acid ethylsulfonic acid, polyacrylic acid butylsulfonic acid, poly (2-acrylamido-) 2-methylpropane sulfonic acid), polyisoprene sulfonic acid and the like. These may be homopolymers or copolymers of two or more.
- polystyrene sulfonic acid polystyrene sulfonic acid, polyisoprene sulfonic acid, polyacrylic acid ethyl sulfonic acid, and poly acrylic acid butyl sulfonic acid are preferable, and polystyrene sulfonic acid (PSS) is more preferable, from the viewpoint of imparting conductivity.
- PSS polystyrene sulfonic acid
- the polymer having a polyanion, in particular, a sulfo group improves the dispersibility of the monomer in the dispersion medium to obtain a conjugated conductive polymer, and further functions as a dopant of the conjugated conductive polymer.
- the polyanion used in the present invention preferably has a weight average molecular weight of 1,000 to 1,000,000, more preferably 5,000 to 500,000, and still more preferably 50,000 to 300,000.
- weight average molecular weight is in this range, the solubility of the polyanion in the dispersion medium and the doping of the polyanion into the conjugated conductive polymer become good.
- weight average molecular weight said here is the value measured as polystyrene conversion molecular weight using gel permeation chromatography.
- the polyanion may be selected from commercially available ones having the above-mentioned characteristics, or may be synthesized by a known method.
- the synthesis method of polyanion is described, for example, in JP-A-2005-76016.
- the total amount of polyanions used is the total amount of anions in the polyanions.
- the amount of the functional group is preferably 0.25 to 30 moles, more preferably 0.8 to 25 moles, with respect to 1 mole of a monomer for obtaining a conjugated conductive polymer.
- the amount of the polyanion used in this step is preferably 10 to 30,000 parts by mass, more preferably 50 to 25,000 parts by mass, with respect to 100 parts by mass of the conjugated conductive polymer. When the amount of polyanion used is 10 parts by mass or more, the conductivity of the conductive polymer is appropriate, and when it is 30,000 parts by mass or less, the dispersibility of the conductive polymer in the dispersion medium is good.
- the seed particles used in the present invention are polymer particles which are protectively colloidalized by polyanions in the dispersing medium.
- a seed particle what consists of a polymer which contains 1 type, or 2 or more types of ethylenically unsaturated monomers as a structural unit, for example is preferable.
- the polymers may be used alone or in combination of two or more, and may be either crystalline or amorphous. In the case of crystallinity, the degree of crystallinity is preferably 50% or less.
- the ethylenically unsaturated monomer may be one having one or more polymerizable ethylenic carbon-carbon double bonds.
- the ethylenically unsaturated monomers include (meth) acrylates having a linear, branched or cyclic alkyl chain; aromatic vinyl compounds such as styrene and ⁇ -methylstyrene; heterocyclics such as vinyl pyrrolidone Vinyl compounds; hydroxyalkyl (meth) acrylates; dialkylaminoalkyl (meth) acrylates such as 2-ethylhexyl (meth) acrylate; vinyl esters such as vinyl acetate, vinyl alkanoate; monoolefins such as ethylene, propylene, butylene, isobutylene; Conjugated diolefins such as butadiene, isoprene and chloroprene; ⁇ , ⁇ -unsaturated mono or dicarboxylic acids such as acrylic acid,
- (meth) acrylic refers to acrylic or methacrylic
- (meth) acrylate refers to acrylate or methacrylate.
- the ethylenically unsaturated monomer may contain a crosslinkable monomer, and may be crosslinked by itself or in combination with an ethylenically unsaturated compound having an active hydrogen group.
- a crosslinked copolymer By using a crosslinked copolymer, the water resistance, moisture resistance, heat resistance, and the like of the conductive film can be improved.
- the crosslinkable monomer is a compound having two or more ethylenic carbon-carbon double bonds, or one or more ethylenic carbon-carbon double bonds, and one other reactive group. It says the compound which it has above.
- crosslinkable monomer examples include epoxy group-containing ⁇ , ⁇ -ethylenically unsaturated compounds such as glycidyl (meth) acrylate; hydrolyzable alkoxysilyls such as vinyltriethoxysilane and ⁇ -methacryloxypropyltrimethoxysilane. Group-containing ⁇ , ⁇ -ethylenically unsaturated compounds; polyfunctional vinyl compounds such as ethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, allyl (meth) acrylate, divinylbenzene, diallyl phthalate and the like. .
- polyhydrazide compounds in particular, oxalic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide
- a crosslinkable monomer such as a carbonyl group-containing ⁇ , ⁇ -ethylenically unsaturated compound (containing a ketone group)
- Crosslinking may be performed in combination with one having two or more hydrazide groups such as polyacrylic acid hydrazide. 50 mass% or less is preferable, as for content of the crosslinkable monomer in an ethylenically unsaturated monomer, 35 mass% or less is more preferable, and 25 mass% or less is more preferable.
- the seed particles are those that are protectively colloidalized by the polyanion in the dispersing medium, and a dispersion of protective colloidal seed particles dispersed in the dispersing medium can be produced as a resin emulsion.
- the polymerization reaction of the resin emulsion is a radical polymerization reaction, and is carried out by using an atmospheric pressure reactor or a pressure resistant reactor, either batchwise, semicontinuously or continuously.
- an atmospheric pressure reactor or a pressure resistant reactor either batchwise, semicontinuously or continuously.
- the reaction temperature is usually 10 to 100 ° C., and 30 to 90 ° C. is common.
- the reaction time is not particularly limited, and may be appropriately adjusted in accordance with the amount of each component, the type of polymerization initiator, the reaction temperature, and the like.
- the polyanion which is a protective colloid contributes to the stability of the emulsion particles, but if necessary, an emulsifier such as an anionic emulsifier, a nonionic emulsifier and a reactive emulsifier, an aliphatic amine, etc. You may add.
- the type and amount of the emulsifier and aliphatic amine may be appropriately adjusted according to the amount of polyanion used and the various conditions including the composition of the ethylenically unsaturated monomer.
- alkyl sulfate ester salt alkyl benzene sulfonate, alkyl sulfo succinate, alkyl diphenyl ether disulfonate, polyoxyalkylene alkyl sulfate, polyoxyalkylene alkyl phosphate
- Anionic emulsifiers such as ester, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenol ether, polyoxyalkylene fatty acid ester, nonionic surfactant, such as polyoxyalkylene sorbitan fatty acid ester, are mentioned.
- primary amines such as octylamine, laurylamine, myristylamine, stearylamine, oleylamine, etc.
- secondary amines such as dioctylamine, dilaurylamine, distearylamine, dioleylamine, N, N-dimethyl lauryl Amine, N, N-dimethylmyristylamine, N, N-dimethylpalmitylamine, N, N-dimethylstearylamine, N.I.
- Tertiary amines such as N-dimethyl behenylamine, N, N-dimethyl oleylamine, N-methyldidecylamine, N-methyl dioleylamine and the like can be mentioned.
- the emulsifier and the aliphatic amine may be used singly or in combination of two or more.
- water-soluble polymers such as polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and polyvinyl pyrrolidone may be used in combination as long as the properties of the conjugated conductive polymer obtained are not impaired.
- the dispersion medium is an aqueous medium and includes water or a mixed solvent of water and a water-soluble solvent.
- the proportion of the water-soluble solvent in the mixed solvent is preferably 0 to 30% by mass.
- the polymerization reaction of a resin emulsion can be stabilized as the ratio of a water-soluble solvent is 30 mass% or less.
- the water-soluble solvent include alcohols such as methanol, ethanol and isopropyl alcohol, ketones such as acetone, glycols such as ethylene glycol and propylene glycol, and ethers such as ethylene glycol monomethyl ether and ethylene glycol monobutyl ether. .
- polymerization initiator used in radical polymerization known and commonly used ones can be used.
- the polymerization initiator include inorganic peroxides such as hydrogen peroxide, persulfate, ammonium persulfate, potassium persulfate and sodium persulfate, organic peroxides such as benzoyl peroxide and t-butyl hydroperoxide, Azo compounds such as 2,2'-azobisisobutyronitrile, 4,4'-azobis (4-cyanovaleric acid) and the like can be mentioned.
- these polymerization initiators may be combined with sodium sulfoxylate formaldehyde, ascorbic acids, sulfites, tartaric acid or salts thereof, iron (II) sulfate and the like to obtain redox polymerization.
- chain transfer agents such as alcohol and mercaptans, as needed.
- the amount of the polyanion and the ethylenically unsaturated monomer used in the production of the protective colloidal seed particles is preferably 10 to 100 parts by mass, more preferably the ethylenically unsaturated monomer per 100 parts by mass of the polyanion Is 20 to 90 parts by mass. If the amount of the ethylenically unsaturated monomer used is 10 parts by mass or more, the proportion of the conductive polymer containing the seed particle protectively colloided by the polyanion occupied in the conjugated conductive polymer is appropriate, and the polymerization is carried out. It is possible to suppress thickening due to When the amount is 100 parts by mass or less, the stability of the protective colloidal seed particles is good.
- the d50 (50% median diameter on a volume basis) of the particle diameter of the seed particles which are in the form of protective colloid and dispersed in the dispersion medium is preferably 0.01 to 10 ⁇ m, more preferably 0.05 It is preferably 1 to 1 ⁇ m, more preferably 0.1 to 0.8 ⁇ m.
- the particle size distribution of the seed particles can be measured by Microtrac UPA type particle size distribution analyzer manufactured by Nikkiso Co., Ltd. If the d50 of the particle diameter of the seed particles dispersed in the dispersion medium is 0.01 ⁇ m or more, the dispersibility of the seed particles is good, and if it is 10 ⁇ m or less, the particles hardly precipitate.
- Polymerization of Monomer to Obtain Conjugated Conductive Polymer Polymerization of a monomer for obtaining a conjugated conductive polymer can be carried out either in the dispersion medium containing (1) the monomer and seed particles protected by a polyanion, or (2) the monomer And a polyanion.
- the monomer liquid may be one in which monomers for obtaining a conjugated conductive polymer are uniformly dispersed.
- dispersion treatment for that purpose usually uses a strong stirring device such as a homogenizer or an ultrasonic irradiation device, ultrasonic irradiation treatment is preferable.
- the ultrasonic irradiation energy is not particularly limited as long as uniform monomer liquid can be obtained, but the power consumption is 5 to 500 W / L (liter) and the irradiation time is 0.1 to 2 hours / L (liter). preferable.
- a conjugated conductive polymer formed by polymerization It is preferable to contain the same polyanion as that used for protective colloid formation of seed particles from the viewpoint of suppressing the aggregation of
- the polyanion can be contained by being added to the monomer liquid and dissolving, emulsifying or dispersing.
- the amount thereof is preferably 5 to 99% by mass, and 10 to 90% by mass of the total amount of polyanions used. More preferably, 20 to 80% by mass is more preferable.
- the dispersion medium used for the polymerization of the monomer for obtaining the conjugated conductive polymer is a complex of the conjugated conductive polymer and the seed particle protected by the polyanion by a protective anion, or the conjugated conductive polymer.
- a complex of the conjugated conductive polymer and the seed particle protected by the polyanion by a protective anion, or the conjugated conductive polymer There is no particular limitation as long as it is capable of dispersing a complex of the poly (anion) and the polyanion, but the same type as that used in the dispersion of seed particles is preferable.
- the dispersion medium for example, water; Amides such as N-vinylpyrrolidone, hexamethylphosphotriamide, N-vinylformamide, N-vinylacetamide and the like; Phenols such as cresol, phenol, xylenol and the like; Dipropylene glycol, 1, Polyhydric alcohols such as 3-butylene glycol, 1,4-butylene glycol, diglycerin, isoprene glycol, butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol and the like Carbonate compounds such as ethylene carbonate and propylene carbonate; Dioxane, diethyl ether, propylene glycol dialkyl ether, polyethylene glycol dialkyl ether, polypropylene glycol dialkyl ether Ethers such as Le; 3- heterocyclic compound methyl-2-
- the amount of the dispersion medium used is preferably 1 to 50000 parts by mass with respect to a total of 100 parts by mass of a monomer for obtaining a conjugated conductive polymer, a seed particle protected by a polyanion and a polyanion, and a polyanion. More preferably, it is 50 to 10000 parts by mass.
- the amount of the dispersion medium used is 1 part by mass or more, the viscosity during polymerization is appropriate, and when it is 50000 parts by mass or less, the performance of the solid electrolytic capacitor is good.
- the polymerization of the monomers for example, in the case of producing a dispersion containing polypyrroles and polythiophenes as a conjugated conductive polymer, the polymerization is initiated by setting the temperature to a predetermined temperature in the presence of an oxidizing agent.
- peroxodisulfates such as peroxodisulfuric acid, ammonium peroxodisulfate, sodium peroxodisulfate, potassium peroxodisulfate and the like; metal halide compounds such as boron trifluoride; ferric chloride, ferric sulfate, chloride Transition metal compounds such as cupric copper; metal oxides such as silver oxide and cesium oxide; peroxides such as hydrogen peroxide and ozone; organic peroxides such as benzoyl peroxide; oxygen and the like.
- peroxydisulfuric acid and peroxodisulfate are preferable, and peroxodisulfate is more preferable.
- the oxidizing agents can be used singly or in combination of two or more.
- the temperature at the time of polymerization of the monomers is usually 5 to 80 ° C., preferably 10 to 60 ° C., more preferably 15 to 40 ° C.
- the polymerization temperature is in this range, the polymerization can be carried out at an appropriate reaction rate, the increase in viscosity can be suppressed, and the production of a dispersion containing a conductive polymer can be stably performed economically.
- the conductivity of the resulting conductive polymer tends to be high.
- the temperature at the time of polymerization can be controlled by using a known heater or cooler. Moreover, you may polymerize, changing temperature within the said range as needed.
- step (A) of obtaining the conjugated conductive polymer-containing dispersion liquid it is preferable to carry out dispersion treatment of the conjugated conductive polymer formed by the polymerization of the monomer during the polymerization reaction. It is preferable to carry out this dispersion treatment by a strong stirring device such as a homogenizer or ultrasonic irradiation. This dispersion treatment can suppress aggregation of the conjugated conductive polymer having a long main chain.
- the power consumption per dispersion treatment liquid is 5 to 500 W / L until the end of the reaction. It is preferred to do.
- dispersion of protective colloidal seed particles it is preferable to further add a dispersion of seed particles protected with a polyanion into a protective colloid during polymerization of the monomers using the dispersion containing the monomers and a seed particle protected with a protective colloid. .
- a dispersion of a predetermined amount of protective colloidal seed particles during the polymerization of the monomers it is possible to suppress the thickening of the reaction liquid at the time of polymerization, to improve the stirring and mixing efficiency, or to a manufacturing apparatus. The load can be reduced.
- the amount of dispersion of protective colloided seed particles to be added during polymerization is preferably 10 to 90% by mass, more preferably 20 to 70% by mass of the total dispersion of protective colloided seed particles used .
- the polyanion may be further added during the polymerization of the monomer solution.
- the amount of polyanion added during polymerization is preferably 0 to 90% by mass, more preferably 20 to 70% by mass, of the total amount of polyanions used.
- Step (B) of Preparing a Dispersion Containing a Morpholine Compound and a Conjugated Conductive Polymer a dispersion containing a morpholine compound in which a morpholine compound is added to the conjugated conductive polymer-containing dispersion (dispersion a) obtained in the above-mentioned step (A) and a conjugated conductive polymer There is a step of preparing a liquid (hereinafter sometimes referred to as "dispersion b").
- the morpholine compound is represented by the following general formula (1) It is indicated by.
- the addition of the morpholine compound makes it possible to produce a solid electrolytic capacitor having a high capacity development ratio (capacitance), an excellent heat resistance, and a high reliability under high temperature conditions.
- corrosion resistance can be imparted to the solid electrolytic capacitor, and the pH of the conjugated conductive polymer-containing dispersion can be adjusted.
- R 1 is (1) a hydrogen atom, (2) a hydroxyl group, a cyano group, an alkyl group having 1 to 8 carbon atoms which may be substituted with an amino group, (3) 5 to 6 carbon atoms (4) amino group, cyano group or phenyl group which may be substituted by formyl group, (5) acetyl group, (6) acetoacetyl group, (7) allyl group, (8) acroyl group A group, (9) a pyridyl group, (10) an alkylsulfo group which may be substituted with a hydroxyl group, or (11) a formyl group, n is 0, 1 or 2.
- Specific examples of the compound represented by the general formula (1) include morpholine, 4-methylmorpholine, 4-ethylmorpholine, 4-n-propylmorpholine, 4-isopropylmorpholine, 4-n-butylmorpholine and 4-isobutylmorpholine , 4-pentylmorpholine, 4-hexylmorpholine, (R) -3-methylmorpholine, (S) -3-methylmorpholine, cis-2,6-dimethylmorpholine, 4- (1-cyclohexenyl) morpholine, 1- Morpholino-1-cyclopentene, 4-phenylmorpholine, 4- (p-tolyl) morpholine, 4- (2-aminoethyl) morpholine, 4- (3-aminopropyl) morpholine, 2-morpholinoaniline, 4-morpholinoaniline, 4- (2-morpholinoethoxy) aniline, 4- (4-pyridyl) Morpholine, 4-aminomorpho
- morpholine 4-ethylmorpholine, 4-n-butylmorpholine, 4-isobutylmorpholine, 4-phenylmorpholine, 4- (2-hydroxypropyl) morpholine, 4- (2-hydroxyethyl) morpholine, 4- (3-hydroxypropyl) morpholine is preferred in terms of productivity.
- the amount of the morpholine compound added to the dispersion a is preferably 0.1 to 4 equivalents, more preferably 0.4 to 2 equivalents, relative to the neutralization equivalent of the dispersion a. If it is 0.1 equivalent or more, the addition effect appears notably. If the addition is 4 equivalents or less, de-doping of the polyanion doped in the conjugated conductive polymer hardly occurs.
- the addition amount of the morpholine compound to the dispersion a is preferably adjusted so that the pH falls within a range of 3 to 13, and more preferably adjusted to a pH of 4 to 7. If the pH is 3 or more, corrosion is less likely to be progressed by the valve metal used such as aluminum. In addition, if the pH is 13 or less, de-doping of the polyanion doped in the conductive polymer becomes difficult to occur.
- additives In addition to the morpholine compound represented by General Formula (1), other additives can be added to the dispersion liquid b, as needed. Other additives are not particularly limited as long as they can be mixed with the conjugated conductive polymer and the seed particle or polyanion protected by the polyanion to be protectively colloided. Other additives may also be added in step (A). Examples of such additives include water-soluble polymer compounds, water-dispersible compounds, alkaline compounds, surfactants, antifoaming agents, coupling agents, antioxidants, electrical conductivity improvers and the like. These additives can be used singly or in combination of two or more.
- the water-soluble polymer compound is a water-soluble polymer having a cationic group or a nonionic group in the main chain or side chain of the polymer.
- Specific examples of the water-soluble polymer compound include, for example, polyoxyalkylene, water-soluble polyurethane, water-soluble polyester, water-soluble polyamide, water-soluble polyimide, water-soluble polyacrylic, water-soluble polyacrylamide, polyvinyl alcohol, polyacrylic acid, etc. Can be mentioned. Among these, polyoxyalkylene is preferred.
- polyoxyalkylene examples include diethylene glycol, triethylene glycol, oligopolyethylene glycol, triethylene glycol monochlorohydrin, diethylene glycol monochlorohydrin, oligoethylene glycol monochlorohydrin, triethylene glycol monobromohydrin, diethylene glycol monobromohydrin, Oligoethylene glycol monobromohydrin, polyethylene glycol, glycidyl ethers, polyethylene glycol glycidyl ethers, polyethylene oxide, triethylene glycol dimethyl ether, tetra ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether diethylene glycol Dibutyl ether, dipropylene glycol, tripropylene glycol, polypropylene glycol, polypropylene dioxide, polyoxyethylene alkyl ethers, polyoxyethylene glycerol fatty acid esters, polyoxyethylene fatty acid amides.
- the water-dispersible compound is a compound in which a part of the low hydrophilic compound is substituted with a highly hydrophilic functional group, or a compound in which a compound with a high hydrophilic functional group is adsorbed around the low hydrophilic compound (For example, an emulsion etc.) which is dispersed without being precipitated in water.
- Specific examples thereof include polyester, polyurethane, acrylic resin, silicone resin, and an emulsion of these polymers.
- Other examples include block copolymers and graft copolymers of acrylic resins and other copolymers such as polyesters and polyurethanes.
- the water-soluble polymer compound and the water-dispersible compound can be used singly or in combination of two or more. By adding the water-soluble polymer compound and the water-dispersible compound, the viscosity of the dispersion containing the conductive polymer can be adjusted, and the coating performance can be improved.
- the amount of the water-soluble polymer compound and the water-dispersible compound used is preferably 1 to 4000 parts by mass, based on 100 parts by mass in total of the conjugated conductive polymer and the seed particles protected with a polyanion. Preferably, it is 50 to 2000 parts by mass.
- the amount of the water-soluble polymer compound and the water-dispersible compound is in the range of 1 to 4000 parts by mass, proper conductivity can be exhibited, and good equivalent series resistance (ESR) of the solid electrolytic capacitor can be obtained.
- an alkaline compound may be added to the dispersion b.
- the addition of the alkaline compound can impart corrosion resistance to the article to which the dispersion is applied, and can adjust the pH of the conjugated conductive polymer-containing dispersion.
- organic alkaline compounds other than known inorganic alkaline compounds and morpholine compounds can be used.
- an inorganic alkaline compound ammonia, sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia etc. are mentioned, for example.
- the organic alkaline compound include aromatic amines, aliphatic amines, alkali metal alkoxides and the like.
- nitrogen-containing heteroaryl ring compounds are preferred.
- Nitrogen-containing heteroaryl ring compounds are nitrogen-containing heterocyclic compounds that exhibit aromaticity. In aromatic amines, the nitrogen atom contained in the heterocycle has a conjugated relationship with other atoms.
- nitrogen-containing heteroaryl ring compounds include pyridines, imidazoles, pyrimidines, pyrazines, triazines and the like. Among these, pyridines, imidazoles and pyrimidines are preferable from the viewpoint of solvent solubility and the like.
- aliphatic amines examples include ethylamine, n-octylamine, diethylamine, diisobutylamine, methylethylamine, trimethylamine, trimethylamine, triethylamine, allylamine, 2-ethylaminoethanol, 2,2'-iminodiethanol, N-ethylethylenediamine and the like.
- alkali metal alkoxide examples include sodium alkoxide such as sodium methoxide and sodium ethoxide, potassium alkoxide, calcium alkoxide and the like.
- Surfactants include anionic surfactants such as carboxylates, sulfonates, sulfates, phosphates and the like; cationic surfactants such as amines and quaternary ammonium salts; carboxybetaine, aminocarboxylic acid Salts, amphoteric surfactants such as imidazolium betaine; and nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene glycerol fatty acid ester, ethylene glycol fatty acid ester, polyoxyethylene fatty acid amide, and the like.
- silicone resin polydimethylsiloxane, silicone resin etc.
- examples of the antioxidant include phenol-based antioxidants, amine-based antioxidants, phosphorus-based antioxidants, sulfur-based antioxidants, saccharides, vitamins and the like.
- the conductivity improving agent is not particularly limited as long as it increases the conductivity of the dispersion containing the conductive polymer.
- the conductivity improver include compounds containing an ether bond such as tetrahydrofuran; compounds containing a lactone group such as ⁇ -butyrolactone and ⁇ -valerolactone; caprolactam, N-methylcaprolactam, N, N-dimethylacetamide, N Compounds containing an amide or lactam group such as -methylacetamide, N, N-dimethylformamide, N-methylformamide, N-methylformanilide, N-methylpyrrolidone, N-octylpyrrolidone, pyrrolidone and the like; tetramethylene sulfone, dimethyl sulfoxide and the like Sulfone compounds or sulfoxide compounds of the following: saccharides or saccharide derivatives such as sucrose, glucose, fructose and lactose; sugar alcohols
- tetrahydrofuran, N-methyl formamide, N-methyl pyrrolidone, ethylene glycol, propylene glycol, glycerin, dimethyl sulfoxide, and sorbitol are preferable from the viewpoint of improving the electrical conductivity, and ethylene glycol, propylene glycol and glycerin are more preferable among them. preferable.
- the conductivity improver can be used singly or in combination of two or more.
- Step (C) of attaching a dispersion (dispersion liquid b) containing a morpholine compound and a conjugated conductive polymer to a porous anode body the dispersion b obtained in the above-mentioned step (B), an anode body made of a valve metal, and a dielectric film formed on at least a part of the surface of the anode body (C) adhering to the surface of the porous anode body having
- the solid electrolytic capacitor according to the manufacturing method of the present invention may be, for example, a porous electrode obtained by sintering valve metal powder having a high surface area or a porous film obtained by etching a valve metal foil.
- valve metal aluminum (Al), beryllium (Be), bismuth (Bi), magnesium (Mg), germanium (Ge), hafnium (Hf), niobium (Nb), antimony (Sb), silicon (Si) , Tin (Sn), tantalum (Ta), titanium (Ti), vanadium (V), tungsten (W) and zirconium (Zr), and alloys or compounds of at least one of these metals with other elements .
- an electrode material composed of Al, Nb or Ta valve metal is preferable.
- the porous electrode made of valve metal forms, for example, a dielectric oxide film on the surface by anodization to form a porous anode body.
- the porous electrode can be anodized by applying a voltage, for example, in a phosphoric acid solution to form a dielectric oxide film.
- the magnitude of the formation voltage can be determined by the thickness of the dielectric oxide film and the withstand voltage of the capacitor.
- the formation voltage is preferably 1 to 800 V, more preferably 1 to 300 V.
- the dispersion b is then applied to the porous anode body.
- the method of adhesion include known methods such as coating, spraying, and immersion. Above all, a method of immersing the dispersion liquid b from the point of being able to uniformly attach and permeate the porous anode body uniformly is preferable. Also, in order to impregnate by the details of the porous anode body, it may be impregnated under reduced pressure.
- the immersion time is usually about 10 seconds to 5 minutes, and the temperature of the dispersion b is usually about 10 to 35 ° C. although it depends on the type of the dispersion medium.
- the method for producing a solid electrolytic capacitor according to the present invention comprises the step (D) of removing the dispersion medium from the dispersion b attached to the porous anode body obtained in the step (C) described above to form a solid electrolyte layer .
- the removal of the dispersion medium in this step (D) does not mean that the entire dispersion medium is removed, and some dispersion medium may remain as long as it does not affect the production of the solid electrolytic capacitor.
- the removal of the dispersion medium is preferably drying by heat treatment from the viewpoint of efficiency.
- the heating conditions can be determined in consideration of the boiling point and volatility of the dispersion medium.
- the heating is preferably performed in a temperature range in which the conductive polymer is not deteriorated by oxygen, for example, room temperature to 300 ° C., preferably 50 to 200 ° C.
- the heat treatment time is preferably 5 seconds to several hours.
- the heat treatment may be performed, for example, under the atmosphere using a hot plate, an oven, a hot air drier, or under reduced pressure to rapidly perform the heat treatment.
- the step (C) of attaching the dispersion described above and the step (D) of forming the solid electrolyte layer may be repeated once or twice or more depending on the type of the electrode assembly.
- Heat treatment may be carried out each time the dispersion is deposited to remove a part or all of the dispersion medium, or the dispersion may be deposited several times in succession, and finally the dispersion medium may be removed.
- any electrolyte may be impregnated.
- Solid content concentration The solid content concentration of each example is about 10 g of the sample obtained in each example, an infrared moisture meter (manufactured by Kett Scientific Research Institute, model FD-720, heating condition 110 ° C./30 minutes The evaporation residue was calculated as a solid content.
- pH The pH of the dispersion obtained in each example was measured at 25 ° C. using a pH meter (manufactured by Toa DK K. K., type HM-30G).
- Particle Size of Seed Particles Measured by a Microtrac UPA type particle size distribution analyzer manufactured by Nikkiso Co., Ltd.
- Example 1 [Preparation of dispersion liquid of seed particles protected with polyanion by protective colloid] 86 g of styrene, 49 g of 2-ethylhexyl acrylate, 15 g of divinylbenzene and 500 g of a 22% by mass aqueous solution of sodium polystyrene sulfonate (manufactured by Tosoh Organic Chemical Co., Ltd., Polinath PS-5, weight average molecular weight: about 120000) are mixed by stirring A mixture was prepared. On the other hand, the temperature was raised to 80 ° C.
- Dispersion Liquid a) Containing Seed Particles Protected by Polyanion In a 1 L polyethylene container, 223.2 g of water, 31.5 g of a 12% by mass aqueous solution of sodium polystyrene sulfonate, and 34.0 g of a dispersion of seed particles protected with the polyanion prepared above and dispersed at a temperature of 32 ° C. did.
- the monomer dispersion is introduced into a 1 L stainless steel container connected with a high shear mixer (MILDER (registered trademark) 303 V; 5000 rpm) manufactured by Pacific Kiko Co., Ltd. and a circulation pump, and the stirring blade and the high shear mixer are used.
- MILDER registered trademark
- a circulation pump a circulation pump
- stirring blade and the high shear mixer are used.
- Stirring with circulation at 32 ° C. 5.89 g of sodium peroxodisulfate and 6.88 g of a 1% by mass aqueous solution of iron (III) sulfate hexahydrate as an oxidant were added, and a polymerization reaction was carried out for 24 hours.
- reaction liquid 221 g and water 79 g are charged into a 1 L stainless steel container connected with a high shear mixer (manufactured by IKA, Magic Lab; 1800 rpm) and a circulation pump, and stirred for 12 hours while being circulated and dispersed. Did.
- a high shear mixer manufactured by IKA, Magic Lab; 1800 rpm
- a circulation pump a circulation pump
- 300 mL of cation exchange resin (same as above) and 300 mL of anion exchange resin (same above) are added, and after stirring for 6 hours, the ion exchange resin is separated by filtration.
- a porous anode body having a dielectric oxide film on the surface which is used for a solid electrolytic capacitor, was produced by the method described in JP-A-2011-77257. That is, using a niobium powder for a capacitor, a porous anode body with an anode lead having a dielectric oxide film having niobium pentoxide formed on the surface of the anode body was produced. This porous anode body had a capacitance of 21.4 ⁇ F in 20% sulfuric acid.
- Steps (C) and (D): Preparation of Solid Electrolytic Capacitor The porous anode body obtained by the above method is impregnated in the dispersion (1-1) for 1 minute in the atmosphere at 25 ° C., and then the temperature is raised to 120 ° C. with a hot air drier (type ST-110 manufactured by TABAI). Dried for 30 minutes. This process was repeated 10 times. Next, a carbon paste was applied to the porous anode body and dried so as not to contact the anode lead terminal. Furthermore, a silver paste was applied to obtain an anode-cathode contact, placed on a lead frame, and dried.
- a hot air drier type ST-110 manufactured by TABAI
- This element was electrically connected to the anode lead of the element and the anode lead of the element and sealed with a resin to obtain a solid electrolytic capacitor element.
- the electrostatic capacity ( ⁇ F) at 120 Hz of the obtained solid electrolytic capacitor element was measured using an LCR meter to obtain an initial electrostatic capacity.
- the capacitance ( ⁇ F) at 120 Hz was measured after the device was left to stand in a hot air dryer at 130 ° C. for 250 hours. The results are shown in Table 1.
- Example 2 4-Ethyl morpholine was added instead of morpholine in Example 1 to obtain a dispersion having a solid concentration of 1.7% by mass and a pH of 4.5. Furthermore, 5 parts by mass of ethylene glycol was added to 100 parts by mass of the obtained dispersion liquid, to obtain a impregnated liquid (1-2) for producing a solid electrolytic capacitor.
- a solid electrolytic capacitor element was produced in the same manner as in Example 1, and the capacitance ( ⁇ F) at 120 Hz was measured using an LCR meter. Furthermore, the capacitance ( ⁇ F) at 120 Hz was measured after the obtained device was left to stand in a hot air dryer at 130 ° C. for 250 hours. The results are shown in Table 1.
- Example 3 4- (2-hydroxyethyl) morpholine was added instead of morpholine in Example 1 to obtain a dispersion having a solid concentration of 1.7% by mass and a pH of 4.7. Furthermore, 5 parts by mass of ethylene glycol was added to 100 parts by mass of the obtained dispersion liquid, to obtain a impregnated liquid (1-3) for producing a solid electrolytic capacitor.
- a solid electrolytic capacitor element was produced in the same manner as in Example 1, and the capacitance ( ⁇ F) at 120 Hz was measured using an LCR meter. Furthermore, the capacitance ( ⁇ F) at 120 Hz was measured after the obtained device was left to stand in a hot air dryer at 130 ° C. for 250 hours. The results are shown in Table 1.
- Example 4 [Step (A): Preparation of Conjugated Conductive Polymer-Containing Dispersion Containing Polyanion (Dispersion Liquid a) (Does not Contain Seed Particles)]
- Dispersion Liquid a Dispersion Liquid a
- a 1 L polyethylene container 231.0 g of water and 60.0 g of a 12% by mass aqueous solution of sodium polystyrene sulfonate were stirred and mixed at 32 ° C.
- reaction liquid 221 g and water 79 g are charged into a 1 L stainless steel container connected with a high shear mixer (manufactured by IKA, Magic Lab; 1800 rpm) and a circulation pump, and stirred for 12 hours while being circulated and dispersed. Did.
- Comparative Example 1 The morpholine of Example 1 was not added to obtain a dispersion having a solid concentration of 1.4% by mass and a pH of 1.9. 5 parts by mass of ethylene glycol was added to 100 parts by mass of the dispersion to obtain a impregnated liquid (1-5) for producing a solid electrolytic capacitor.
- a solid electrolytic capacitor element was produced in the same manner as in Example 1, and the capacitance ( ⁇ F) at 120 Hz was measured using an LCR meter. Furthermore, the capacitance ( ⁇ F) at 120 Hz was measured after the obtained device was left to stand in a hot air dryer at 130 ° C. for 250 hours. The results are shown in Table 1.
- Comparative example 2 Aqueous ammonia was added instead of morpholine in Example 1 to obtain a dispersion having a solid content concentration of 1.5% by mass and a pH of 4.8. Furthermore, 5 parts by mass of ethylene glycol was added to 100 parts by mass of the obtained dispersion liquid, to obtain a impregnated liquid (1-6) for producing a solid electrolytic capacitor.
- a solid electrolytic capacitor element was produced in the same manner as in Example 1, and the capacitance ( ⁇ F) at 120 Hz was measured using an LCR meter. Furthermore, the capacitance ( ⁇ F) at 120 Hz was measured after the obtained device was left to stand in a hot air dryer at 130 ° C. for 250 hours. The results are shown in Table 1.
- the solid electrolytic capacitor element of No. 4 has a stable capacity expression ratio (capacitance) as compared with the solid electrolytic capacitor elements of Comparative Examples 1 and 2 to which no morpholine compound is added, has excellent heat resistance, and has high reliability under high temperature conditions. Is high.
- an industrially useful solid electrolytic capacitor having a high capacity development rate (capacitance), excellent heat resistance, and high reliability under high temperature conditions.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
陽極酸化による誘電体酸化被膜で被われる金属の例として、アルミニウム、タンタル、ニオブ等が知られている。
また、固体電解コンデンサに用いられる導電性高分子として、ポリチオフェン、ポリピロール、ポリアニリン、ポリアセチレン、ポリフェニレン、ポリ(p-フェニレン-ビニレン)、ポリアセン、ポリチオフェンビニレン及びその誘導体等の共役系導電性重合体が知られている。また、前記共役系導電性重合体の対アニオンとしてポリスチレンスルホン酸等のポリアニオンを用い、共役系導電性重合体をドープする技術が知られている。
例えば、特開2003-100561号公報(特許文献1)には、コンデンサ素子に導電性高分子の微粒子を分散させた導電性高分子分散水溶液を含浸させて第1の固体電解質層を形成する工程と、この第1の固体電解質層の表面に、複素環式モノマーを含有する溶液と酸化剤を含有する溶液を個々に含浸させることにより、または複素環式モノマーと酸化剤を含有する混合溶液を含浸させることにより第2の固体電解質層を形成する工程を有する製造方法が開示されている。
すなわち、本発明は下記[1]~[14]の固体電解コンデンサの製造方法及び固体電解コンデンサに関する。
前記共役系導電性重合体含有分散液に、下記一般式(1)
で示されるモルホリン化合物を添加し、モルホリン化合物と共役系導電性重合体を含有する分散液を調製する工程(B)、
前記分散液を表面に誘電体被膜を有する弁作用金属からなる多孔性陽極体に付着させる工程(C)、
及び前記多孔性陽極体に付着した、モルホリン化合物と共役系導電性重合体を含有する分散液から分散媒を除去し固体電解質層を形成する工程(D)
を有することを特徴とする固体電解コンデンサの製造方法。
[2] 前記一般式(1)で示されるモルホリン化合物が、4-n-ブチルモルホリン、4-イソブチルモルホリン、4-フェニルモルホリン、4-(2-ヒドロキシプロピル)モルホリン、4-(2-ヒドロキシエチル)モルホリン、または4-(3-ヒドロキシプロピル)モルホリンである前項1に記載の固体電解コンデンサの製造方法。
[3] 前記シード粒子が、エチレン性不飽和単量体の重合体の粒子である前項1または2に記載の固体電解コンデンサの製造方法。
[4] 前記ポリアニオンにより保護コロイド化されたシード粒子のd50粒子径が、0.01~10μmである前項1~3のいずれかに記載の固体電解コンデンサの製造方法。
[5] 前記共役系導電性重合体含有分散液を得る工程(A)において、前記共役系導電性重合体を得るための単量体の重合中にさらにポリアニオンまたはポリアニオンにより保護コロイド化されたシード粒子の分散液を添加する前項1~4のいずれかに記載の固体電解コンデンサの製造方法。
[6] 前記共役系導電性重合体含有分散液を得る工程(A)において、生成する共役系導電性重合体を分散処理する前項1~5のいずれかに記載の固体電解コンデンサの製造方法。
[7] 前記分散処理が超音波照射である前項6に記載の固体電解コンデンサの製造方法。
[8] 前記共役系導電性重合体を得るための単量体が、置換基を有してもよい、ピロール化合物、アニリン化合物、及びチオフェン化合物から選ばれる少なくとも1つである前項1~7のいずれかに記載の固体電解コンデンサの製造方法。
[9] 前記共役系導電性重合体を得るための単量体が、下記式(2)
[10] 前記ポリアニオンが、スルホ基を有するポリマーである前項1~9のいずれかに記載の固体電解コンデンサの製造方法。
[11] 前記ポリアニオン中のアニオン基の割合が、前記共役系導電性重合体を得るための単量体1モルに対し、0.25~30モルである前項1~10のいずれかに記載の固体電解コンデンサの製造方法。
[12] 前記共役系導電性重合体含有分散液を得る工程(A)において、前記分散媒が水を含み、前記重合がペルオキソ二硫酸及びその塩から選ばれる少なくとも1つの酸化剤を用いて行われる前項1~11のいずれかに記載の固体電解コンデンサの製造方法。
[13] 前記工程(B)において、電気伝導率向上剤としてエチレングリコール、プロピレングリコール及びグリセリンから選ばれる少なくとも1つを添加する前項1~12のいずれかに記載の固体電解コンデンサの製造方法。
[14] 前項1~13のいずれかに記載の製造方法で得られた固体電解コンデンサ。
本明細書においては、共役系導電性重合体を得るための単量体を単独で重合して、または複数の単量体を共重合して得られる共役系導電性共重合体を合わせて「共役系導電性重合体」と言う。
また、ポリアニオンがシード粒子の表面に配位して保護コロイドを形成した状態の粒子を「ポリアニオンにより保護コロイド化されたシード粒子」と言う。なお、ポリアニオンは、アニオン性基を2個以上有する重合体を意味する。
共役系導電性重合体含有分散液を得る工程(A)は、(1)共役系導電性重合体を得るための単量体とポリアニオンにより保護コロイド化されたシード粒子とを含む分散媒中、または(2)共役系導電性重合体を得るための単量体とポリアニオンとを含む分散媒中で、前記単量体を重合して行われる。
本工程(A)における共役系導電性重合体含有分散液(以下、「分散液a」と呼ぶことがある)は、共役系導電性重合体とポリアニオンにより保護コロイド化されたシード粒子との複合体、または共役系導電性重合体とポリアニオンとの複合体から選択される少なくとも一つが分散媒中に分散した分散液である。本工程において、ポリアニオンは共役系導電性重合体にドープすることで複合体を形成すると考えられる。
本明細書において、共役系導電性重合体は主鎖にπ共役系を有する有機高分子化合物であれば特に限定されるものではない。共役系導電性重合体化合物としては、例えば、ポリピロール類、ポリチオフェン類、ポリイソチアナフテン類、ポリアセチレン類、ポリフェニレン類、ポリフェニレンビニレン類、ポリアニリン類、ポリアセン類、ポリチオフェンビニレン類、及びこれらの共重合体等が挙げられる。なお、前記の共役系導電性重合体化合物表記における「類」は、当該化合物構造を含む化合物群を意味するものであり、例えばポリピロール類はポリピロール構造を含む化合物群を指す。
前記の共役系導電性重合体の中でも、ポリピロール類、ポリチオフェン類及びポリアニリン類が好ましく、ポリチオフェン類がより好ましい。また、高い導電性を得る観点から、アルキル基、カルボキシ基、スルホ基、アルコキシル基、水酸基、シアノ基等の置換基を有する共役系導電性重合体が好ましい。
以下に好ましい共役系導電性重合体であるポリピロール類、ポリチオフェン類及びポリアニリン類の具体例を示す。
これらの中でも、導電性が高い点から、ポリピロール、ポリチオフェン、ポリ(N-メチルピロール)、ポリ(3-メチルチオフェン)、ポリ(3-メトキシチオフェン)及びポリ(3,4-エチレンジオキシチオフェン)が好ましい。特に導電性が高く、耐熱性にも優れていることから、ポリ(3,4-エチレンジオキシチオフェン)(PEDOT)がより好ましい。
本発明では、共役系導電性重合体は、1種単独でまたは2種以上を組み合わせて用いることができる。
前記共役系導電性重合体の構成単位である単量体は、置換基を有してもよいピロール、置換基を有してもよいアニリン、及び置換基を有してもよいチオフェンから選ばれる1種以上を含むものが好ましい。置換基としては、例えば炭素数1~18のアルキル基、炭素数6~10のアリール基、炭素数5~10のヘテロアリール基、炭素数1~18のアルコキシ基、炭素数1~18のアルキルチオ基、カルボキシ基、水酸基、ハロゲン原子及びシアノ基等が挙げられる。なお、前記アルキル基、アリール基、ヘテロアリール基、アルコキシ基及びアルキルチオ基は、カルボキシ基、水酸基、ハロゲン原子またはシアノ基のうちから選ばれる1種以上で置換されていてもよい。また、前記置換基は、2つ以上が縮合して環を形成していてもよい。
アニリン、2-メチルアニリン、3-イソブチルアニリン、2-アニリンスルホン酸、3-アニリンスルホン酸等が挙げられる。
本発明では共役系導電性重合体を得るための単量体は、1種単独でまたは2種以上を組み合わせて用いることができる。
前記イオウ原子含有複素環としては、チイラン環、チエタン環、チオフェン環、チアン環、チオピラン環、チオピリリウム環、ベンゾチオピラン環、ジチアン環、ジチオラン環、トリチアン環等が挙げられる。
前記イオウ原子及び酸素原子含有複素環としては、オキサチオラン環、オキサチアン環等が挙げられる。
R4及びR5は、好ましくはR4とR5とが互いに結合して環を形成した、置換基を有してもよい炭素数3~6の酸素原子含有複素環である。前記酸素原子含有複素環としては、ジオキサン環、トリオキサン環等が挙げられ、好ましくはジオキサン環である。置換基としては、例えば炭素数1~18のアルキル基、炭素数6~10のアリール基、炭素数5~10のヘテロアリール基、炭素数1~18のアルコキシ基、炭素数1~18のアルキルチオ基、カルボキシ基、水酸基、ハロゲン原子及びシアノ基が挙げられる。なお、前記アルキル基、アリール基、ヘテロアリール基、アルコキシ基及びアルキルチオ基は、カルボキシ基、水酸基、ハロゲン原子またはシアノ基で置換されていてもよい。また2つ以上の置換基が縮合して環を形成していてもよい。
ポリアニオンは、アニオン性基を2個以上有する重合体であり、シード粒子の表面に配位して保護コロイドを形成し、かつ、共役系導電性重合体へのドーパントとして機能する。
アニオン性基としては、例えば、スルホン酸またはその塩からなる基、リン酸またはその塩からなる基、一置換リン酸エステル基、カルボン酸またはその塩からなる基、一置換硫酸エステル基等が挙げられる。これらの中でも、強酸性基が好ましく、スルホン酸またはその塩からなる基、及びリン酸またはその塩からなる基がより好ましく、スルホン酸またはその塩からなる基がさらに好ましい。
アニオン性基は、重合体の主鎖に直接結合していても、側鎖に結合していてもよい。アニオン性基が側鎖に結合している場合、ドープ効果がより顕著となることから、側鎖末端に結合していることが好ましい。
ポリエステルとしては、ポリエチレンテレフタレート、ポリブチレンテレフタレート等が挙げられる。
ポリアニオン、特にスルホ基を有するポリマーは、共役系導電性重合体を得るための単量体の分散媒中での分散性を向上させ、さらに共役系導電性重合体のドーパントとして機能する。
また、本工程における共役系導電性重合体100質量部に対するポリアニオンの使用量は、好ましくは10~30000質量部、より好ましくは50~25000質量部である。
ポリアニオンの使用量が10質量部以上であれば導電性重合体の導電性が適切であり、30000質量部以下であれば導電性重合体の分散媒中での分散性が良好である。
本発明に用いるシード粒子は、分散媒体中でポリアニオンにより保護コロイド化されるポリマー粒子である。シード粒子としては、例えば、1種または2種以上のエチレン性不飽和単量体を構成単位として含む重合体からなるものが好ましい。重合体は、1種単独でも、2種以上の混合物でもよく、また、結晶性または非晶性のいずれでもよい。結晶性の場合は、結晶化度が50%以下であることが好ましい。
なお、本明細書において、「(メタ)アクリル」は、アクリルまたはメタクリルを指し、また、「(メタ)アクリレート」は、アクリレートまたはメタクリレートを指す。
架橋性単量体としては、例えば、グリシジル(メタ)アクリレート等のエポキシ基含有α,β-エチレン性不飽和化合物;ビニルトリエトキシシラン、γ-メタクリロキシプロピルトリメトキシシラン等の加水分解性アルコキシシリル基含有α,β-エチレン性不飽和化合物;エチレングリコールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、アリル(メタ)アクリレート、ジビニルベンゼン、ジアリルフタレート等の多官能ビニル化合物等が挙げられる。
また、カルボニル基含有α,β-エチレン性不飽和化合物(ケトン基含有のもの)等の架橋性単量体を用いて、ポリヒドラジン化合物(特に、シュウ酸ジヒドラジド、コハク酸ジヒドラジド、アジピン酸ジヒドラジド、ポリアクリル酸ヒドラジド等の2個以上のヒドラジド基を有するもの)と組み合わせて架橋させてもよい。
エチレン性不飽和単量体中の架橋性単量体の含有量は、50質量%以下が好ましく、35質量%以下がより好ましく、25質量%以下がさらに好ましい。
シード粒子は、分散媒体中でポリアニオンによって保護コロイド化されるものであり、分散媒中に分散した保護コロイド化されたシード粒子の分散液は、樹脂エマルジョンとして製造することができる。
反応温度は、通常10~100℃で行われ、30~90℃が一般的である。反応時間は特に制限されることはなく、各成分の使用量、重合開始剤の種類及び反応温度等に応じて適宜調整すればよい。
乳化剤及び脂肪族アミンは、1種単独または2種以上を組み合わせて使用してもよい。
保護コロイド化されて、分散媒体中に分散しているシード粒子の粒径のd50(体積基準での50%メジアン径)は、0.01~10μmであることが好ましく、より好ましくは0.05~1μmで、さらに好ましくは0.1~0.8μmである。シード粒子の粒子径分布は、日機装(株)製、マイクロトラックUPA型粒度分布測定装置にて測定できる。分散媒体中に分散しているシード粒子の粒径のd50が0.01μm以上であればシード粒子の分散性が良好であり、10μm以下であれば粒子が沈降しにくい。
共役系導電性重合体を得るための単量体の重合は、(1)当該単量体とポリアニオンにより保護コロイド化されたシード粒子とを含む分散媒中で、または(2)当該単量体とポリアニオンとを含む分散媒中で行われる。
共役系導電性重合体を得るための単量体を分散媒中で重合するためには、単量体と保護コロイド化されたシード粒子とを含む分散液、または単量体とポリアニオンを含む分散液(以下、併せて単に「単量体液」と称すことがある。)を調製する。
前記単量体液は、共役系導電性重合体を得るための単量体が均一に分散しているものであればよい。そのための分散処理には通常ホモジナイザー等の強力な撹拌装置、または超音波照射装置を使用するが、超音波照射処理が好ましい。超音波照射エネルギーは、均一な単量体液が得られるのであれば特に限定されないが、消費電力5~500W/L(リットル)、照射時間0.1~2時間/L(リットル)で行うことが好ましい。
共役系導電性重合体を得るための単量体の重合に用いられる分散媒は、共役系導電性重合体とポリアニオンにより保護コロイド化されたシード粒子との複合体、または共役系導電性重合体とポリアニオンとの複合体を分散させることができるものであれば特に限定されないが、シード粒子の分散液に用いたのと同じ種類のものが好ましい。
分散媒としては、例えば、水;N-ビニルピロリドン、ヘキサメチルホスホルトリアミド、N-ビニルホルムアミド、N-ビニルアセトアミド等のアミド類;クレゾール、フェノール、キシレノール等のフェノール類;ジプロピレングリコール、1,3-ブチレングリコール、1,4-ブチレングリコール、ジグリセリン、イソプレングリコール、ブタンジオール、1,5-ペンタンジオール、1,6-ヘキサンジオール、1,9-ノナンジオール、ネオペンチルグリコール等の多価アルコール類;エチレンカーボネート、プロピレンカーボネート等のカーボネート化合物;ジオキサン、ジエチルエーテル、プロピレングリコールジアルキルエーテル、ポリエチレングリコールジアルキルエーテル、ポリプロピレングリコールジアルキルエーテル等のエーテル類;3-メチル-2-オキサゾリジノン等の複素環化合物;アセトニトリル、グルタロジニトリル、メトキシアセトニトリル、プロピオニトリル、ベンゾニトリル等のニトリル類が挙げられる。これらの溶媒は、1種単独でまたは2種以上を組み合わせて用いることができる。これらのうち、水を1~99質量%含む分散媒を用いることが好ましく、水を50~99質量%含むことがより好ましく、水を単独で用いることがさらに好ましい。
前記単量体の重合において、例えば、ポリピロール類やポリチオフェン類を共役系導電性重合体として含む分散液を製造する場合、酸化剤の存在下に所定の温度にすることによって重合が開始される。
酸化剤としては、ペルオキソ二硫酸、ペルオキソ二硫酸アンモニウム、ペルオキソ二硫酸ナトリウム、ペルオキソ二硫酸カリウム等のペルオキソ二硫酸塩;三フッ化ホウ素等の金属ハロゲン化合物;塩化第二鉄、硫酸第二鉄、塩化第二銅等の遷移金属化合物;酸化銀、酸化セシウム等の金属酸化物;過酸化水素、オゾン等の過酸化物;過酸化ベンゾイル等の有機過酸化物;酸素等が挙げられる。これらのうちペルオキソ二硫酸及びペルオキソ二硫酸塩が好ましく、ペルオキソ二硫酸塩がより好ましい。
前記酸化剤は、1種単独でまたは2種以上を組み合わせて用いることができる。
前記単量体の重合時の温度は通常、5~80℃であり、好ましくは10~60℃であり、より好ましくは15~40℃である。重合時の温度をこの範囲内にすると、適度な反応速度で重合を行うことができ、粘度の上昇を抑えることができ、導電性重合体を含む分散液の製造を安定的に経済的な時間で行うことができ、かつ得られる導電性重合体の導電率が高くなる傾向がある。重合時の温度は、公知のヒータやクーラを用いることにより管理することができる。また、必要に応じ、前記範囲内で温度を変化させながら重合を行ってもよい。
共役系導電性重合体含有分散液を得る工程(A)においては、重合反応中に前記単量体の重合で生成する共役系導電性重合体を分散処理することが好ましい。この分散処理は、ホモジナイザー等の強力な撹拌装置や超音波照射によって行うことが好ましい。この分散処理によって、長い主鎖を有する共役系導電性重合体の凝集を抑制することができる。例えば、特開2007-332183公報に記載のせん断速度5000s-1以上で撹拌しながら重合させる方法や、超音波照射の場合、分散処理液あたりの消費電力5~500W/Lで、反応終了時まで行うことが好ましい。
また、前記単量体と保護コロイド化されたシード粒子とを含む分散液を用いた前記単量体の重合中に、ポリアニオンにより保護コロイド化されたシード粒子の分散液をさらに添加することが好ましい。前記単量体の重合中に、所定量の保護コロイド化されたシード粒子の分散液をさらに添加することにより、重合時の反応液の増粘を抑制でき撹拌混合効率の向上や製造装置への負荷を低減することができる。重合中に添加する保護コロイド化されたシード粒子の分散液の量は、使用する保護コロイド化されたシード粒子の分散液の総量の10~90質量%が好ましく、20~70質量%がより好ましい。
単量体液の重合中にポリアニオンをさらに添加してもよい。前記単量体の重合中に所定量のポリアニオンの一部をさらに添加することにより重合時の反応液の増粘を抑制でき撹拌混合効率の向上や製造装置への負荷を低減することができる。重合中に添加するポリアニオンの量は、使用するポリアニオンの総量の0~90質量%が好ましく、20~70質量%がより好ましい。
本発明の製造方法では、前述の工程(A)で得られた共役系導電性重合体含有分散液(分散液a)にモルホリン化合物を添加したモルホリン化合物と共役系導電性重合体を含有する分散液(以下「分散液b」と呼ぶことがある)を調製する工程を有する。
モルホリン化合物は、下記一般式(1)
式(1)中、R1は、(1)水素原子、(2)水酸基、シアノ基、アミノ基で置換されていてもよい炭素数1~8のアルキル基、(3)炭素数5~6のシクロアルケニル基、(4)アミノ基、シアノ基、またはホルミル基で置換されていてもよいフェニル基、(5)アセチル基、(6)アセトアセチル基、(7)アリル基、(8)アクロイル基、(9)ピリジル基、(10)水酸基で置換されていてもよいアルキルスルホ基、または(11)ホルミル基を表し、nは0、1または2である。
分散液bには、必要に応じて一般式(1)で示されるモルホリン化合物以外に他の添加剤を添加することができる。他の添加剤は、共役系導電性重合体、及びポリアニオンにより保護コロイド化されたシード粒子若しくはポリアニオンと混合しうるものであれば特に制限されない。また、他の添加剤は、工程(A)で添加してもよい。
このような添加剤としては、例えば、水溶性高分子化合物、水分散性化合物、アルカリ性化合物、界面活性剤、消泡剤、カップリング剤、酸化防止剤、電気伝導率向上剤等が挙げられる。これらの添加剤は、1種単独でまたは2種以上を組み合わせて用いることができる。
水溶性高分子化合物及び水分散性化合物は、1種単独でまたは2種以上を組み合わせて用いることができる。水溶性高分子化合物及び水分散性化合物を添加することにより、導電性重合体を含む分散液の粘度調節ができ、また塗布性能を向上させることができる。
窒素含有ヘテロアリール環化合物としては、ピリジン類、イミダゾール類、ピリミジン類、ピラジン類、トリアジン類等が挙げられる。これらの中でも、溶媒溶解性等の観点から、ピリジン類、イミダゾール類、ピリミジン類が好ましい。
酸化防止剤としては、フェノール系酸化防止剤、アミン系酸化防止剤、リン系酸化防止剤、硫黄系酸化防止剤、糖類、ビタミン類等が挙げられる。
本発明の固体電解コンデンサの製造方法は、前述の工程(B)で得られた分散液bを、弁金属からなる陽極体と、該陽極体表面の少なくとも一部に形成された誘電体被膜とを有する多孔性陽極体の表面に付着させる工程(C)を有する。
本発明の製造方法に係る固体電解コンデンサは、例えば、高表面積を有する弁金属粉末を焼結してなる多孔性の電極、あるいは弁金属箔をエッチングし得られる多孔性膜を電極とすることができる。
前記弁金属としては、アルミニウム(Al)、ベリリウム(Be)、ビスマス(Bi)、マグネシウム(Mg)、ゲルマニウム(Ge)、ハフニウム(Hf)、ニオブ(Nb)、アンチモン(Sb)、ケイ素(Si)、スズ(Sn)、タンタル(Ta)、チタン(Ti)、バナジウム(V)、タングステン(W)及びジルコニウム(Zr)、ならびにこれらの金属の少なくとも1つと他の元素との合金または化合物が挙げられる。中でもAl、Nb、またはTaの弁金属から構成される電極材料が好ましい。
前記多孔性電極は、例えばリン酸溶液中で電圧を印加することにより陽極酸化され、誘電体酸化被膜を形成することができる。誘電体酸化被膜の厚さやコンデンサの耐電圧により、化成電圧の大きさを決めることができる。好ましい化成電圧は1~800Vであり、より好ましくは1~300Vである。
浸漬時間は、通常10秒~5分間程度であり、分散液bの温度は分散媒の種類にもよるが通常10~35℃程度である。
本発明の固体電解コンデンサの製造方法は、前述の工程(C)で得られた多孔性陽極体に付着した分散液bから、分散媒を除去し固体電解質層を形成する工程(D)を有する。本工程(D)における分散媒の除去は、分散媒の全てを除去することを意味するものでなく、固体電解コンデンサの製造に影響しない範囲で分散媒が一部残存してもいて差し支えない。
分散媒の除去は、効率性の点から加熱処理による乾燥が好ましい。加熱条件は、分散媒の沸点や揮発性を考慮して決めることができる。加熱は、導電性重合体の酸素による劣化のない温度範囲、例えば、室温~300℃、好ましくは50~200℃で行うことが好ましい。加熱処理時間は5秒~数時間が好ましい。加熱処理は、例えば、ホットプレート、オーブン、熱風乾燥機を用いて大気下で、もしくは加熱処理を迅速に行うために減圧下で行ってもよい。
各例の固形分濃度は、各例で得られた試料およそ10gを、赤外線水分計((株)ケツト科学研究所製、形式FD-720、加熱条件110℃/30分)を用いて測定し、蒸発残分を固形分として計算した。
(2)pH
各例で得られた分散液のpHは、25℃においてpHメーター(東亜ディーケーケー(株)製、型式HM-30G)を用いて測定した。
(3)シード粒子の粒径
日機装(株)製マイクロトラックUPA型粒度分布測定装置により測定した。
(4)ポリスチレンスルホン酸ナトリウムの重量平均分子量
ゲル浸透クロマトグラフィーを用いて測定を行った。なお、測定には昭和電工(株)製の「Shodex(登録商標) GPC 101」(カラム OHPak SB-806M HQ)を用い、測定条件はカラム温度40℃、溶出液は水、溶出速度1ml/分とした。標準ポリスチレン換算分子量(Mw)で表示した。
[ポリアニオンで保護コロイド化されたシード粒子の分散液の作製]
スチレン86g、2-エチルヘキシルアクリレート49g、ジビニルベンゼン15g及びポリスチレンスルホン酸ナトリウム(東ソー有機化学株式会社製、ポリナスPS-5、重量平均分子量:約120000)22質量%水溶液500gを撹拌混合し、単量体混合液を調製した。一方、ポリスチレンスルホン酸ナトリウム(同上)22質量%水溶液1000gを撹拌しながら、80℃に昇温し、これに過硫酸カリウム2gを添加した。この溶液に、前記単量体混合液及び過硫酸カリウム2.5質量%水溶液40gを、それぞれ、2時間及び2.5時間かけて滴下した。滴下終了後、80℃で2時間保持し、その後、室温(25℃)まで冷却した。得られた反応液に陽イオン交換樹脂(オルガノ株式会社製、IR120B-H)1500ml及び陰イオン交換樹脂(オルガノ株式会社製、IRA410-OH)1500mlを添加し、12時間撹拌した後、イオン交換樹脂をろ別した。イオン交換水(以下、単に水と言う。)を添加して固形分濃度が15.0質量%となるように調整し、ポリアニオンで保護コロイド化されたシード粒子(Tg:30℃、粒径d50:0.46μm)の分散液を得た。
1Lポリエチレン製容器内で、水223.2g、ポリスチレンスルホン酸ナトリウム12質量%水溶液31.5g、及び上記で作製したポリアニオンで保護コロイド化されたシード粒子の分散液34.0gを32℃で撹拌混合した。この混合液に、32℃で3,4-エチレンジオキシチオフェン2.80gを添加して、ホモミキサー(特殊機化工業株式会社製、ロボミックス;4000rpm)で30分間乳化混合し、単量体分散液を調製した(3,4-エチレンジオキシチオフェン1モルに対するスルホ基含有量:1.9モル)。なお、前記スルホ基は、ポリスチレンスルホン酸ナトリウム12質量%水溶液及び前記分散液中のポリスチレンスルホン酸ナトリウム由来のものである。
前記単量体分散液を、ハイシェアミキサー(太平洋機工株式会社製、マイルダー(登録商標)303V;5000rpm)及び循環ポンプが接続された1Lステンレス製容器に投入し、撹拌翼及びハイシェアミキサーにより、32℃で循環しながら撹拌し、酸化剤としてペルオキソ二硫酸ナトリウム5.89g及び硫酸鉄(III)六水和物の1質量%水溶液6.88gを添加して、24時間重合反応を行った。得られた反応液221g、及び水79gをハイシェアミキサー(IKA社製、マジックラボ;1800rpm)及び循環ポンプが接続された1Lステンレス製容器に投入し、12時間、循環しながら撹拌し、分散処理を行った。得られた分散液300gに、陽イオン交換樹脂(同上)300mL及び陰イオン交換樹脂(同上)300mLを添加し、6時間撹拌した後、イオン交換樹脂をろ別し、この操作により、未反応単量体及び酸化剤を除去し、ポリアニオンで保護コロイド化されたシード粒子と共役系導電性重合体との複合体を含む分散液(固形分濃度2.7質量%、pH1.9)を得た。
[工程(B):モルホリン化合物と共役系導電性重合体を含有する分散液(分散液b)の調製]
得られた分散液にモルホリンを添加し、さらに純水を加えて、固形分濃度が1.6質量%、pHが4.9の分散液を得た。さらに、得られた分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-1)を得た。
特開2011-77257号公報に記載の方法によって固体電解コンデンサに用いる、誘電体酸化被膜を表面に有する多孔性陽極体を製造した。すなわち、コンデンサ用ニオブ粉末を用い、陽極体表面に五酸化二ニオブを有する誘電体酸化被膜が形成された陽極リード付きの多孔性陽極体を作製した。この多孔性陽極体は、20%硫酸中での静電容量は、21.4μFであった。
25℃の大気下で、上記方法で得られた多孔性陽極体を、前記分散液(1-1)に1分間含浸させた後、熱風乾燥器(TABAI製、形式ST-110)で120℃30分間乾燥した。この処理を10回繰り返し行った。次いで陽極リード端子に接触させないように多孔性陽極体にカーボンペーストを塗布し乾燥させた。さらに、陽極・陰極の接点をとるために銀ペーストを塗布しリードフレーム上に置き、乾燥させた。この素子を該素子の陽極リード線をリードフレームの陽極リード部に電気的に接続させ樹脂で封止し、これによって固体電解コンデンサ素子を得た。得られた固体電解コンデンサ素子の120Hzでの静電容量(μF)をLCRメーターを用いて測定し、初期静電容量とした。次に、素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
実施例1のモルホリンの代わりに4-エチルモルホリンを添加し、固形分濃度が1.7質量%、pHが4.5の分散液を得た。さらに、得られた分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-2)を得た。実施例1と同様の方法で、固体電解コンデンサ素子を作製し、120Hzでの静電容量(μF)をLCRメーターを用いて測定した。さらに、得られた素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
実施例1のモルホリンの代わりに4-(2-ヒドロキシエチル)モルホリンを添加し、固形分濃度が1.7質量%、pHが4.7の分散液を得た。さらに、得られた分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-3)を得た。実施例1と同様の方法で、固体電解コンデンサ素子を作製し、120Hzでの静電容量(μF)をLCRメーターを用いて測定した。さらに、得られた素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
[工程(A):ポリアニオンを含む共役系導電性重合体含有分散液(分散液a)の製造(シード粒子を含まない)]
1Lポリエチレン製容器内で、水231.0g、ポリスチレンスルホン酸ナトリウム12質量%水溶液60.0gを32℃で撹拌混合した。この混合液に、32℃で3,4-エチレンジオキシチオフェン2.80gを添加して、ホモミキサー(特殊機化工業株式会社製、ロボミックス;4000rpm)で30分間乳化混合し、単量体分散液を調製した。
前記単量体分散液を、ハイシェアミキサー(太平洋機工株式会社製、マイルダー(登録商標)303V;5000rpm)及び循環ポンプが接続された1Lステンレス製容器に投入し、撹拌翼及びハイシェアミキサーにより、32℃で循環しながら撹拌し、酸化剤としてペルオキソ二硫酸ナトリウム5.89g及び硫酸鉄(III)六水和物の1質量%水溶液6.88gを添加して、24時間重合反応を行った。得られた反応液221g、及び水79gをハイシェアミキサー(IKA社製、マジックラボ;1800rpm)及び循環ポンプが接続された1Lステンレス製容器に投入し、12時間、循環しながら撹拌し、分散処理を行った。得られた分散液300gに、陽イオン交換樹脂(同上)300mL及び陰イオン交換樹脂(同上)300mLを添加し、6時間撹拌した後、イオン交換樹脂をろ別し、この操作により、未反応単量体及び酸化剤を除去し、ポリアニオンと共役系導電性重合体との複合体を含む分散液(固形分濃度2.6質量%、pH1.8)を得た。
得られた分散液にモルホリンを添加し、固形分濃度が1.6質量%、pHが4.6の分散液を得た。さらに、得られた分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-4)を得た。実施例1と同様の方法で、固体電解コンデンサ素子を作製し、120Hzでの静電容量(μF)をLCRメーターを用いて測定した。さらに、得られた素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
実施例1のモルホリンの添加を行わず、固形分濃度が1.4質量%、pHが1.9の分散液を得た。分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-5)を得た。実施例1と同様の方法で、固体電解コンデンサ素子を作製し、120Hzでの静電容量(μF)をLCRメーターを用いて測定した。さらに、得られた素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
実施例1のモルホリンの代わりにアンモニア水を添加し、固形分濃度が1.5質量%、pHが4.8の分散液を得た。さらに、得られた分散液100質量部に対しエチレングリコールを5質量部添加し、固体電解コンデンサ作製用の含侵液(1-6)を得た。
実施例1と同様の方法で、固体電解コンデンサ素子を作製し、120Hzでの静電容量(μF)をLCRメーターを用いて測定した。さらに、得られた素子を130℃の熱風乾燥機で250時間放置した後の120Hzでの静電容量(μF)を測定した。結果を表1に示す。
Claims (14)
- ポリアニオンにより保護コロイド化されたシード粒子を含む分散媒中で、またはポリアニオンを含む分散媒中で、共役系導電性重合体を得るための単量体を重合して共役系導電性重合体含有分散液を得る工程(A)、
前記共役系導電性重合体含有分散液に、下記一般式(1)
(式中、R1は、(1)水素原子、(2)水酸基、シアノ基、アミノ基で置換されていてもよい炭素数1~8のアルキル基、(3)炭素数5~6のシクロアルケニル基、(4)アミノ基、シアノ基、またはホルミル基で置換されていてもよいフェニル基、(5)アセチル基、(6)アセトアセチル基、(7)アリル基、(8)アクロイル基、(9)ピリジル基、(10)水酸基で置換されていてもよいアルキルスルホ基、または(11)ホルミル基を表わし、nは0、1または2である。)
で示されるモルホリン化合物を添加し、モルホリン化合物と共役系導電性重合体を含有する分散液を調製する工程(B)、
前記分散液を表面に誘電体被膜を有する弁作用金属からなる多孔性陽極体に付着させる工程(C)、
及び前記多孔性陽極体に付着した、モルホリン化合物と共役系導電性重合体を含有する分散液から分散媒を除去し固体電解質層を形成する工程(D)
を有することを特徴とする固体電解コンデンサの製造方法。 - 前記一般式(1)で示されるモルホリン化合物が、モルホリン、4-エチルモルホリン、4-n-ブチルモルホリン、4-イソブチルモルホリン、4-フェニルモルホリン、4-(2-ヒドロキシプロピル)モルホリン、4-(2-ヒドロキシエチル)モルホリン、または4-(3-ヒドロキシプロピル)モルホリンである請求項1に記載の固体電解コンデンサの製造方法。
- 前記シード粒子が、エチレン性不飽和単量体の重合体の粒子である請求項1または2に記載の固体電解コンデンサの製造方法。
- 前記ポリアニオンにより保護コロイド化されたシード粒子のd50粒子径が、0.01~10μmである請求項1~3のいずれかに記載の固体電解コンデンサの製造方法。
- 前記共役系導電性重合体含有分散液を得る工程(A)において、前記共役系導電性重合体を得るための単量体の重合中にさらにポリアニオンまたはポリアニオンにより保護コロイド化されたシード粒子の分散液を添加する請求項1~4のいずれかに記載の固体電解コンデンサの製造方法。
- 前記共役系導電性重合体含有分散液を得る工程(A)において、生成する共役系導電性重合体を分散処理する請求項1~5のいずれかに記載の固体電解コンデンサの製造方法。
- 前記分散処理が超音波照射である請求項6に記載の固体電解コンデンサの製造方法。
- 前記共役系導電性重合体を得るための単量体が、置換基を有してもよい、ピロール化合物、アニリン化合物、及びチオフェン化合物から選ばれる少なくとも1つである請求項1~7のいずれかに記載の固体電解コンデンサの製造方法。
- 前記共役系導電性重合体を得るための単量体が、下記式(2)
(式中、R2及びR3は、各々独立して水素原子、水酸基、置換基を有してもよい炭素数1~18のアルキル基、置換基を有してもよい炭素数1~18のアルコキシ基、若しくは置換基を有してもよい炭素数1~18のアルキルチオ基を表し、またはR2とR3とが互いに結合して置換基を有してもよい炭素数3~10の脂環、置換基を有してもよい炭素数6~10の芳香環、置換基を有してもよい炭素数2~10の酸素原子含有複素環、置換基を有してもよい炭素数2~10のイオウ原子含有複素環、若しくは置換基を有してもよい炭素数2~10のイオウ原子及び酸素原子含有複素環を表す。)示される化合物である請求項1~8のいずれかに記載の固体電解コンデンサの製造方法。 - 前記ポリアニオンが、スルホ基を有するポリマーである請求項1~9のいずれかに記載の固体電解コンデンサの製造方法。
- 前記ポリアニオン中のアニオン基の割合が、前記共役系導電性重合体を得るための単量体1モルに対し、0.25~30モルである請求項1~10のいずれかに記載の固体電解コンデンサの製造方法。
- 前記共役系導電性重合体含有分散液を得る工程(A)において、前記分散媒が水を含み、前記重合がペルオキソ二硫酸及びその塩から選ばれる少なくとも1つの酸化剤を用いて行われる請求項1~11のいずれかに記載の固体電解コンデンサの製造方法。
- 前記工程(B)において、電気伝導率向上剤としてエチレングリコール、プロピレングリコール及びグリセリンから選ばれる少なくとも1つを添加する請求項1~12のいずれかに記載の固体電解コンデンサの製造方法。
- 請求項1~13のいずれかに記載の製造方法で得られた固体電解コンデンサ。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18850243.9A EP3678152B1 (en) | 2017-08-31 | 2018-05-09 | Method for manufacturing solid electrolytic capacitor |
| KR1020207005381A KR102414490B1 (ko) | 2017-08-31 | 2018-05-09 | 고체 전해 콘덴서의 제조 방법 |
| US16/635,722 US11591480B2 (en) | 2017-08-31 | 2018-05-09 | Method for manufacturing solid electrolytic capacitor |
| CN201880056310.1A CN111052280B (zh) | 2017-08-31 | 2018-05-09 | 固体电解电容器的制造方法 |
| JP2019538961A JP7298475B2 (ja) | 2017-08-31 | 2018-05-09 | 固体電解コンデンサの製造方法 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017167324 | 2017-08-31 | ||
| JP2017-167324 | 2017-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2019044044A1 true WO2019044044A1 (ja) | 2019-03-07 |
Family
ID=65525257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2018/017998 Ceased WO2019044044A1 (ja) | 2017-08-31 | 2018-05-09 | 固体電解コンデンサの製造方法 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US11591480B2 (ja) |
| EP (1) | EP3678152B1 (ja) |
| JP (2) | JP7298475B2 (ja) |
| KR (1) | KR102414490B1 (ja) |
| CN (1) | CN111052280B (ja) |
| WO (1) | WO2019044044A1 (ja) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2022054640A1 (ja) * | 2020-09-08 | 2022-03-17 | ||
| US20220415581A1 (en) * | 2019-12-24 | 2022-12-29 | Panasonic Intellectual Property Management Co., Ltd. | Electrolytic capacitor and method for producing same |
| JP2023019101A (ja) * | 2021-07-28 | 2023-02-09 | 東ソー株式会社 | 導電性高分子溶液及びその用途 |
| WO2023119762A1 (ja) * | 2021-12-21 | 2023-06-29 | 株式会社レゾナック | 固体電解コンデンサ用重合体分散液の製造方法及び固体電解コンデンサの製造方法 |
| WO2025142117A1 (ja) * | 2023-12-28 | 2025-07-03 | Tdk株式会社 | 固体電解コンデンサ |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115989554A (zh) * | 2020-08-27 | 2023-04-18 | 松下知识产权经营株式会社 | 电解电容器 |
| TWI819397B (zh) * | 2020-10-26 | 2023-10-21 | 日商信越聚合物股份有限公司 | 導電性高分子分散液及其製造方法、含導電性高分子的液體及其製造方法、導電性層疊體及其製造方法、以及電容器及其製造方法 |
| CN114551983B (zh) * | 2021-10-08 | 2023-06-09 | 万向一二三股份公司 | 一种高韧性的peodme复合固体电解质膜及其制备方法、固体锂电池 |
| CN118471584B (zh) * | 2024-05-15 | 2025-03-25 | 南京点援微材料科技有限公司 | 一种导电石墨乳及其制备方法、应用 |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003100561A (ja) | 2001-07-16 | 2003-04-04 | Matsushita Electric Ind Co Ltd | 固体電解コンデンサの製造方法 |
| JP2005076016A (ja) | 2003-09-03 | 2005-03-24 | Shin Etsu Polymer Co Ltd | 導電性組成物及びその製造方法 |
| JP2005109252A (ja) | 2003-09-30 | 2005-04-21 | Nippon Chemicon Corp | 固体電解コンデンサの製造方法 |
| JP2007332183A (ja) | 2006-06-12 | 2007-12-27 | Yokohama Rubber Co Ltd:The | 導電性ポリマーの合成方法および導電性ポリマーならびに導電性ポリマー分散液の製造方法および導電性ポリマー分散液 |
| JP2011510141A (ja) | 2008-01-22 | 2011-03-31 | エイチ・シー・スタルク・クレビオス・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | 導電性ポリマーの製造方法 |
| JP2011077257A (ja) | 2009-09-30 | 2011-04-14 | Showa Denko Kk | 固体電解コンデンサの製造方法 |
| JP2014024905A (ja) * | 2012-07-25 | 2014-02-06 | Tosoh Corp | 導電性膜用高分子分散体 |
| WO2014136796A1 (ja) * | 2013-03-05 | 2014-09-12 | 昭和電工株式会社 | 固体電解コンデンサおよびその製造方法 |
| WO2014163202A1 (ja) | 2013-04-05 | 2014-10-09 | 昭和電工株式会社 | 固体電解コンデンサの製造方法 |
| WO2016088300A1 (ja) * | 2014-12-01 | 2016-06-09 | パナソニックIpマネジメント株式会社 | 電解コンデンサおよびその製造方法 |
| WO2016103616A1 (ja) * | 2014-12-25 | 2016-06-30 | パナソニックIpマネジメント株式会社 | 電解コンデンサの製造方法 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE331513B (ja) * | 1969-06-19 | 1971-01-04 | Ericsson Telefon Ab L M | |
| JPS60149628A (ja) * | 1984-01-17 | 1985-08-07 | Toray Ind Inc | 電解酸化重合方法 |
| US5266617A (en) * | 1991-04-22 | 1993-11-30 | Allied-Signal Inc. | Lewis base catalyzed phase transfer coating process for polyanilines |
| US5526224A (en) | 1994-05-23 | 1996-06-11 | Matsushita Electric Industrial Co., Ltd. | Ion-conductive polymer electrolyte and electrolytic capacitor using the same |
| US6517892B1 (en) | 1999-05-24 | 2003-02-11 | Showa Denko K.K. | Solid electrolytic capacitor and method for producing the same |
| US20070096066A1 (en) * | 2003-06-18 | 2007-05-03 | Kazuyoshi Yoshida | Conductive composition, conductive coating material, conductive resin, capacitor, photoelectric transducer, and their production method |
| JP2008085240A (ja) | 2006-09-29 | 2008-04-10 | Nichicon Corp | 電解コンデンサの駆動用電解液および電解コンデンサ |
| CN101302339B (zh) | 2007-05-09 | 2010-10-27 | 郑州泰达电子材料科技有限公司 | 导电性聚合物组合物和使用该组合物的固体电解电容器 |
| JP4792145B2 (ja) | 2008-01-31 | 2011-10-12 | ニチコン株式会社 | 電解コンデンサの駆動用電解液および電解コンデンサ |
| JP2009196202A (ja) | 2008-02-21 | 2009-09-03 | Konica Minolta Opto Inc | ハードコートフィルム、これを用いた反射防止フィルム、偏光板、及び表示装置 |
| CN103390502B (zh) | 2012-05-08 | 2016-10-19 | 海洋王照明科技股份有限公司 | 吗啉离子液体/凝胶聚合物电解质膜及其制备方法 |
| JP6190575B2 (ja) * | 2012-06-22 | 2017-08-30 | 日本ケミコン株式会社 | ゲル電解質、コンデンサ用ゲル電解質及びゲル電解質コンデンサ |
| WO2014141367A1 (ja) | 2013-03-11 | 2014-09-18 | 昭和電工株式会社 | 導電性重合体含有分散液の製造方法 |
| WO2015037481A1 (ja) | 2013-09-11 | 2015-03-19 | テイカ株式会社 | 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 |
| JP6417621B2 (ja) * | 2014-02-12 | 2018-11-07 | ナガセケムテックス株式会社 | インク用組成物及び透明電極 |
| EP2950317B1 (en) | 2014-05-30 | 2017-08-23 | Heraeus Deutschland GmbH & Co. KG | Two or polyfunctional compounds as adhesion primers for conductive polymers |
| JP6607832B2 (ja) | 2016-08-05 | 2019-11-20 | 信越ポリマー株式会社 | 導電性高分子分散液及びその製造方法、並びに導電性フィルム及びその製造方法 |
-
2018
- 2018-05-09 JP JP2019538961A patent/JP7298475B2/ja active Active
- 2018-05-09 KR KR1020207005381A patent/KR102414490B1/ko active Active
- 2018-05-09 WO PCT/JP2018/017998 patent/WO2019044044A1/ja not_active Ceased
- 2018-05-09 CN CN201880056310.1A patent/CN111052280B/zh active Active
- 2018-05-09 US US16/635,722 patent/US11591480B2/en active Active
- 2018-05-09 EP EP18850243.9A patent/EP3678152B1/en active Active
-
2023
- 2023-04-10 JP JP2023063733A patent/JP7552775B2/ja active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003100561A (ja) | 2001-07-16 | 2003-04-04 | Matsushita Electric Ind Co Ltd | 固体電解コンデンサの製造方法 |
| JP2005076016A (ja) | 2003-09-03 | 2005-03-24 | Shin Etsu Polymer Co Ltd | 導電性組成物及びその製造方法 |
| JP2005109252A (ja) | 2003-09-30 | 2005-04-21 | Nippon Chemicon Corp | 固体電解コンデンサの製造方法 |
| JP2007332183A (ja) | 2006-06-12 | 2007-12-27 | Yokohama Rubber Co Ltd:The | 導電性ポリマーの合成方法および導電性ポリマーならびに導電性ポリマー分散液の製造方法および導電性ポリマー分散液 |
| US8721928B2 (en) | 2008-01-22 | 2014-05-13 | Heraeus Precious Metals Gmbh & Co. Kg | Method for the production of conductive polymers |
| JP2011510141A (ja) | 2008-01-22 | 2011-03-31 | エイチ・シー・スタルク・クレビオス・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | 導電性ポリマーの製造方法 |
| JP2011077257A (ja) | 2009-09-30 | 2011-04-14 | Showa Denko Kk | 固体電解コンデンサの製造方法 |
| JP2014024905A (ja) * | 2012-07-25 | 2014-02-06 | Tosoh Corp | 導電性膜用高分子分散体 |
| WO2014136796A1 (ja) * | 2013-03-05 | 2014-09-12 | 昭和電工株式会社 | 固体電解コンデンサおよびその製造方法 |
| WO2014163202A1 (ja) | 2013-04-05 | 2014-10-09 | 昭和電工株式会社 | 固体電解コンデンサの製造方法 |
| US9640325B2 (en) | 2013-04-05 | 2017-05-02 | Showa Denko K.K. | Method for manufacturing solid electrolytic capacitor |
| WO2016088300A1 (ja) * | 2014-12-01 | 2016-06-09 | パナソニックIpマネジメント株式会社 | 電解コンデンサおよびその製造方法 |
| WO2016103616A1 (ja) * | 2014-12-25 | 2016-06-30 | パナソニックIpマネジメント株式会社 | 電解コンデンサの製造方法 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP3678152A4 |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220415581A1 (en) * | 2019-12-24 | 2022-12-29 | Panasonic Intellectual Property Management Co., Ltd. | Electrolytic capacitor and method for producing same |
| US12131872B2 (en) * | 2019-12-24 | 2024-10-29 | Panasonic Intellectual Property Management Co., Ltd. | Electrolytic capacitor and method for producing same |
| JPWO2022054640A1 (ja) * | 2020-09-08 | 2022-03-17 | ||
| WO2022054640A1 (ja) * | 2020-09-08 | 2022-03-17 | 凸版印刷株式会社 | 有機導電フィルムの製造方法、有機導電フィルム及び積層体 |
| JP7757970B2 (ja) | 2020-09-08 | 2025-10-22 | Toppanホールディングス株式会社 | 有機導電フィルムの製造方法、有機導電フィルム及び積層体 |
| JP2023019101A (ja) * | 2021-07-28 | 2023-02-09 | 東ソー株式会社 | 導電性高分子溶液及びその用途 |
| WO2023119762A1 (ja) * | 2021-12-21 | 2023-06-29 | 株式会社レゾナック | 固体電解コンデンサ用重合体分散液の製造方法及び固体電解コンデンサの製造方法 |
| EP4456099A4 (en) * | 2021-12-21 | 2025-12-24 | Resonac Corp | METHOD FOR PRODUCING POLYMER DISPERSION FOR SOLID ELECTROLYTIC CAPACITOR, AND METHOD FOR PRODUCING SOLID ELECTROLYTIC CAPACITOR |
| WO2025142117A1 (ja) * | 2023-12-28 | 2025-07-03 | Tdk株式会社 | 固体電解コンデンサ |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2023093563A (ja) | 2023-07-04 |
| EP3678152A4 (en) | 2021-06-09 |
| EP3678152A1 (en) | 2020-07-08 |
| JP7552775B2 (ja) | 2024-09-18 |
| US20210130628A1 (en) | 2021-05-06 |
| KR102414490B1 (ko) | 2022-06-29 |
| CN111052280B (zh) | 2022-08-23 |
| CN111052280A (zh) | 2020-04-21 |
| JP7298475B2 (ja) | 2023-06-27 |
| KR20200028021A (ko) | 2020-03-13 |
| JPWO2019044044A1 (ja) | 2020-08-13 |
| EP3678152B1 (en) | 2022-09-21 |
| US11591480B2 (en) | 2023-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7552775B2 (ja) | 共役系導電性重合体含有分散液、及び固体電解コンデンサの製造方法 | |
| JP6539913B2 (ja) | 固体電解コンデンサの製造方法 | |
| CN111527574B (zh) | 固体电解电容器制造用分散液组合物和固体电解电容器的制造方法 | |
| TWI864446B (zh) | 固體電解電容用聚合物分散液之製造方法及固體電解電容之製造方法 | |
| CN111937106B (zh) | 固体电解电容器的制造方法、和含有共轭系导电性聚合物的分散液的制造方法 | |
| JP7131941B2 (ja) | 共役系導電性重合体を含有する分散液の製造方法、固体電解コンデンサの製造方法および固体電解コンデンサ | |
| JP2024089375A (ja) | 固体電解コンデンサの製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18850243 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 2019538961 Country of ref document: JP Kind code of ref document: A |
|
| ENP | Entry into the national phase |
Ref document number: 20207005381 Country of ref document: KR Kind code of ref document: A |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| ENP | Entry into the national phase |
Ref document number: 2018850243 Country of ref document: EP Effective date: 20200331 |






