Electrolytic capacitor and driving electrolyte thereof

Details Electrolytic capacitor and driving electrolyte thereof Electrolytic capacitor and driving electrolyte thereof

1999-08-31

2002-01-15

Koslow, C. Melissa (Department: 1755)

Compositions

Electrolytes for electrical devices

C361S503000, C361S505000

Reexamination Certificate

active

06338806

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to electrolytic capacitors and driving electrolytes for the same.
BACKGROUND OF THE INVENTION
Boric acid and ammonium borate have traditionally been used as solutes for driving electrolytes (hereinafter, electrolyte) in electrolytic capacitors. Since boric acid and ammonium borate have reasonable anodizing abilities, they have been used in the production of high-voltage capacitors for a long time. However, boric acid and ammonium borate contain condensed water molecules. Therefore, they cannot be used in production of electrolytic capacitors which operate in temperature ranges of 100 degrees Celsius or more.
Well-known non-aqueous electrolytes include ones using, as solutes, di-basic acids or their salts such as azelaic acid, butyl octane di-basic acid (Japanese Patent Laid Open Publication No. S60-13293), 5,6-decan di-carboxylic acid (Japanese Patent Laid Open Publication No. S63-15738), and di-basic acid with side chains (Japanese Patent No. 2681202). With these organic carboxylic acids, water in the electrolytes can be reduced, enabling control of the opening of the valve of the electrolytic capacitor, which is triggered by intensifying internal pressure, even at 100 degrees Celsius or more. Surface active agents such as poly-ethylene glycol (Japanese Patent Laid Open Publication No. H03-76776), poly-glycerine (Japanese Patent Laid Open Publication No. H07-70443), and alkylene block polymer (Japanese Patent No. 2731241) are used to raise the discharge initiation voltage and improve anodizing characteristics.
The electrolytic capacitors used for high frequency circuits and automobile applications are required to have higher withstand voltage, temperature-resistance and longer working life. However, it has been difficult to satisfy such demands with conventional electrolytes which use organic carboxylic acids or their salts as solute and which include surface active agents. The conventional electrolytes are also difficult to use when trying to raise the discharge initiating voltage in processes including anodizing.
The present invention aims at providing driving electrolytes for electrolytic capacitors which have higher withstand voltage, high temperature-resistance and a longer working life, and also providing electrolytic capacitors using such electrolytes.
SUMMARY OF THE INVENTION
In solvents of electrolytes of the present invention, (a) or (b) is dissolved:
(a) Boric acid esters and/or their salts having the following general formulae (1), (2) or (3);
(b) Boric acid esters and/or their salts having the general formulae (1), (2) or (3), which include inorganic acids and/or organic acids such as boric acid or a boric acid salt such as ammonium borate.
R
t
—[(R
1
)
1
—O—B—(OH)—O]
k
—H  (1)
R
t
—[(R
1
)
1
—O—B—(OH)—O—(R
2
)
n
]
k
—R
t
  (2)
wherein R
t
: CH
3
or H,
R
1
, R
2
, and R
3
: —CH
2
O, —C
2
H
4
O, —C
3
H
6
O, or —C
4
H
8
O,
k, l, m, and n: arbitrary natural numbers


REFERENCES:
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patent: 63-100709 (1988-05-01), None
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patent: 3-76776 (1991-12-01), None
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patent: 07 245 247 (1995-09-01), None
patent: 7-320984 (1995-12-01), None
patent: 2681202 (1997-08-01), None
patent: 2731241 (1997-12-01), None
patent: WO96/27201 (1996-09-01), None

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