06519137 is referenced by 40 patents and cites 7 patents.

The present invention relates to a solid electrolytic capacitor having a large capacitance and a higher resistance to heat and adapted as a surface-mount device and a method of producing the same. The invention may include the followings features: (1) a layer containing an electroconductive polymer and a less conductive polymer is provided on a dielectric oxide film on the positive electrode foil; (2) a separator of a polyester resin based unwoven fabric made by span bonding and/or wet processing a resin material is sandwiched between the positive electrode foil and the negative electrode foil and rolled together to form a capacitor element which also include a solid electrolyte; (3) a separator is sandwiched between the positive electrode foil and the negative electrode foil coated with a dielectric oxide film exhibiting a withstand voltage of 0.8 to 10 V and rolled together to form a capacitor element which also include a solid electrolyte of an electrically conductive polymer; (4) the negative electrode foil is coated with a layer made of at least a metallic material selected from titanium, zirconium, hafnium, and its compound or of a carbon material; (5) the capacitor element has its content of, water adjusted to not higher than 1% by weight and is enclosed in an outer case; (6-A) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer with the use of an oxidizing solution of which the weight ratio of bivalent iron to trivalent iron is not higher than 0.02; (6-B) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer with the use of an oxidizing solution of which the molar ratio of aliphatic and/or aromatic sulfonic acid to trivalent iron ranges from 3.0 to 3.5; and (7) the solid electrolyte is a conductive polymer prepared by chemically polymerizing a heterocyclic monomer in which the remaining of a basic organic solvent is not higher than 0.8%.

Title
Solid electrolytic capacitor and production method thereof, and conductive polymer polymerizing oxidizing agent solution
Application Number
9/807760
Publication Number
6519137 (B1)
Application Date
July 16, 2001
Publication Date
February 11, 2003
Inventor
Ichiro Yamashita
Yamaguchi
US
Takehiko Nakahara
Kyoto
US
Hideki Masumi
Kyoto
US
Yoshihiro Watanabe
Osaka
US
Tsuyoshi Yoshino
Kyoto
US
Kazuyo Saito
Osaka
US
Yuki Murata
Yamaguchi
US
Munehiro Morokuma
Osaka
US
Yoshiyuki Mori
Yamaguchi
US
Yukihiro Nitta
Kyoto
US
Agent
McDernott Will & Emery
US
Assignee
Matsushita Electric Industrial
US
IPC
H01G 9/02
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