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US5436796A Expired / Lapsed US ⏱️ 0.0 years remaining

Solid electrolytic capacitor and process for producing the same

Assignee: Nitto Denko Corp
•
Filing: 1994-09-09
•
Granted: 1995-07-25
•
Expires: 2014-09-09
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Abstract

Abstract A solid electrolytic capacitor comprising a film-forming metal, a dielectric oxide film formed thereon, and an electrically conductive composite polymer film formed on the dielectric oxide film as a solid electrolyte, the electrically conductive composite polymer film comprising (a) a polyaniline as a first polymer soluble in an organic solvent in an undoped state, which is a polymer having a quinonediimine structural unit and a phenylenediamine structural unit represented by following formula (I) as the main repeating unit; ##STR1## wherein m and n are the molar fractions of the quinonediimine structural unit and the phenylenediamine structural unit, respectively, and 0<m<1, 0<n<1, and m+n=1, (b) a second polymer selected from a polymer having a structure containing an ester group or an amido group in a main chain or a side chain as the main repeating unit and a cellulose derivative, and (c) a protonic acid having a pKa value of 4.8 or less.

Inventors

  • 👤 Masao Abe
  • 👤 Keisuke Kii
  • 👤 Yoshihiro Uetani
  • 👤 Akira Ohtani

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 23:45
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022; H01G9/025; H01G11/00; H01G11/22; H01G11/30; H01G11/48; H01G11/54; H01G11/56; Y; Y02; Y02E; Y02E60/00; Y02E60/13

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 152 words
A solid electrolytic capacitor comprising a film-forming metal, a dielectric oxide film formed thereon, and an electrically conductive composite polymer film formed on the dielectric oxide film as a solid electrolyte, the electrically conductive composite polymer film comprising (a) a polyaniline as a first polymer soluble in an organic solvent in an undoped state, which is a polymer having a quinonediimine structural unit and a phenylenediamine structural unit represented by following formula (I) as the main repeating unit; ##STR3## wherein m and n are the molar fractions of the quinonediimine structural unit and the phenylenediamine structural unit, respectively, and 0<m<1, 0<n<1, and m+n=1, (b) a second polymer selected from a polymer having a structure containing an ester group or an amido group in a main chain or a side chain as the main repeating unit and a cellulose derivative, and (c) a protonic acid having a pKa value of 4.8 or less.
Claim 2
Dependent Claim 152 words
A solid electrolytic capacitor comprising a film-forming metal, a dielectric oxide film formed thereon, and an electrically conductive composite polymer film formed on the dielectric oxide film as a solid electrolyte, the electrically conductive composite polymer film comprising (a) a polyaniline as a first polymer soluble in an organic solvent in an undoped state, which is a polymer having a quinonediimine structural unit and a phenylenediamine structural unit represented by following formula (I) as the main repeating unit; ##STR3## wherein m and n are the molar fractions of the quinonediimine structural unit and the phenylenediamine structural unit, respectively, and 0<m<1, 0<n<1, and m+n=1, (b) a second polymer selected from a polymer having a structure containing an ester group or an amido group in a main chain or a side chain as the main repeating unit and a cellulose derivative, and (c) a protonic acid having a pKa value of 4.8 or less.
Claim 3
Dependent Claim 31 words
A solid electrolytic capacitor of claim 1, wherein the polyaniline soluble in an organic solvent has an intrinsic viscosity [η] measured in N-methyl-2-pyrrolidone at 30° C. of at least 0.40 dl/g.
Claim 4
Dependent Claim 35 words
A solid electrolytic capacitor of claim 1, wherein the electrically conductive composite polymer film contains the second polymer in an amount of from 10 to 400% by weight based on the weight of the polyaniline.
Claim 5
Dependent Claim 41 words
A process of producing the solid electrolytic capacitor as claimed in claim 1, which comprises subjecting the solid electrolytic capacitor to an aging treatment by applying thereto a D.C. voltage under an atmosphere of a relative humidity of at least 80%.

References Cited (Backward Citations)

JPS63173313A Cited
US4780796A Cited
JPH01253226A Cited
US5264552A Cited
JPH0335516A Cited
JPH053138A Cited
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US5223002A Cited
US5324815A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-07-24 1999-01-23 1999-07-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-07-24 2003-01-23 2003-07-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-07-24 2007-01-23 2007-07-25 $7700.00 Window Closed / Lapsed

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