EP0263182A1
Expired / Lapsed
EP
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Electrolytic solution for electrolytic capacitor and electrolytic capacitor prepared by using it
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1987-02-20
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Granted: —
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Expires: 2007-02-20
Abstract
Abstract Low-temperature characteristics of an electrolytic capacitor and changes with time in the caracteristics In a high-temperature environment are improved and the life of the capacitor is prolonged by using as a solute a quaternary ammonium salt of a carboxylic acid selected from the group consisting of phthalic, tetrahydrophthalic, hexahydrophthalic and maleic acids or an alkyl- or nitro-substituted derivative thereof.
Inventors
- 👤 Yoshiteru 5-6 Nishiyama Waki Kuwae
- 👤 Katsuji 7-3 Sennyuji Goyounotsuji-Machi Shiono
- 👤 Takaaki 22-13 Gokasyou Kitanosyou Kishi
- 👤 Hideki 3-1-502 Miiminami-Machi Shimamoto
- 👤 Hisao 333-1 Ginza-Cho 2-Chome Nagara
- 👤 Keiji 114-5 Itinobe Ashihara Mori
- 👤 Shingo 8-108 Tonominamishimizu Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:38
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/02; H01G9/022
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
54 words
An electrolyte for an electrolytic capacitor characterized by comprising a solution in an organic solvent of a quaternary ammonium salt of a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or a quaternary ammonium salt of an alkyl or nitro-substituted compound of the carboxylic acid.
Claim 2
Dependent Claim
54 words
An electrolyte for an electrolytic capacitor characterized by comprising a solution in an organic solvent of a quaternary ammonium salt of a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or a quaternary ammonium salt of an alkyl or nitro-substituted compound of the carboxylic acid.
Claim 3
Dependent Claim
88 words
An electrolyte according to Claim 1, wherein said quaternary ammonium salt has the following general formula in which X i represents X 2 represents or COOH in which each R 1' each R 2 , each R 3 and each R 4 independently represent an alkyl group, an aryl group, a cycloalkyl group, an aralkyl group and/or a hydroxyalkyl group. or the two of these substituents combine to form a divalent group which forms a ring along with the nitrogen atom, and A represents a carboxylic acid residue.
Claim 4
Dependent Claim
19 words
An electrolyte according to Claim 1, wherein said quaternary ammonium salt is a tetraalkylammonium salt and/or a trialkylhydroxyalkylammonium salt.
Claim 5
Dependent Claim
21 words
An electrolyte according to Claim 1, wherein the alkyl or nitro-substituted compound of the acid is citraconic acid or nitrophthalic acid.
Claim 6
Dependent Claim
16 words
5 t An electrolyte according to Claim 1, wherein said quaternary ammonium salt is monotetraethylammonium phthalate.
Claim 7
Dependent Claim
14 words
An electrolyte according to Claim 1, wherein said quaternary ammonium salt is monotetraethylammonium maleate.
Claim 8
Dependent Claim
15 words
An electrolyte according to Claim 1, wherein said organic solvent is a solvent comprising γ-butyrolactone.
Claim 9
Dependent Claim
29 words
An electrolyte according to Claim 1, wherein the amount of said quaternary ammonium salt is in the range of 1% - 40% based on the weight of the electrolyte.
Claim 10
Dependent Claim
16 words
An electrolyte according to Claim 3, wherein said tetraalkyl ammonium salt is a tetraethyl ammonium salt.
Claim 11
Dependent Claim
80 words
An electrolytic capacitor of the type in which a capacitor element is arranged by providing an anode and a cathode in face-to-face relation through a separator, characterized in that an electrolyte for the capacitor consists of a solution, in an organic solution, of a quaternary ammonium salt of a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or a quaternary ammonium salt of an alkyl or nitro-substituted compound of the acid.
Claim 12
Dependent Claim
80 words
An electrolytic capacitor of the type in which a capacitor element is arranged by providing an anode and a cathode in face-to-face relation through a separator, characterized in that an electrolyte for the capacitor consists of a solution, in an organic solution, of a quaternary ammonium salt of a carboxylic acid selected from the group consisting of phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and maleic acid, or a quaternary ammonium salt of an alkyl or nitro-substituted compound of the acid.
Claim 13
Dependent Claim
89 words
An electrolytic capacitor according to Claim 10, wherein said quaternary ammonium salt has the general formula in which X 1 represents X 2 represents or COOH in which each R 1 , each R 2 , each R 3 and each R 4 independently represent an alkyl group, an aryl group, a cycloalkyl group, an aralkyl group and/or a hydroxyalkyl group, or the two of these substituents combine to form a divalent group which forms a ring along with a nitrogen atom, and A represents a carboxylic acid residue.
Claim 14
Dependent Claim
20 words
An electrolytic capacitor according to Claim 10, wherein said quaternary ammonium salt is a tetraalkylammonium salt and/or a trialkylhydroxyalkylammonium ealt.
Claim 15
Dependent Claim
23 words
An electrolytic capacitor according to Claim 10, wherein the alkyl or nitro-substituted compound of the carboxylic acid is citraconic acid or nitraphthalic acid.
Claim 16
Dependent Claim
15 words
An electrolytic capacitor according to Claim 10, wherein said quaternary ammonium salt is monotetraethylammonium phthalate.
Claim 17
Dependent Claim
15 words
An electrolytic capacitor according to Claim 10, wherein said quaternary ammonium salt is monotetraethylammonium maleate.
Claim 18
Dependent Claim
16 words
An electrolytic capacitor according to Claim 10, wherein said organic solvent is a solvent comprising γ-butyrolactone.
Claim 19
Dependent Claim
30 words
An electrolytic capacitor according to Claim 10, wherein the amount of said quaternary ammonium salt is in the range of 1% - 40% based on the weight of the electrolyte.
Claim 20
Dependent Claim
16 words
An electrolytic capacitor according to Claim 12, wherein said tetraalkylammonium salt is a tetraethyl ammonium salt.
References Cited (Backward Citations)
No citation records indexed.
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