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Additives for Electrolytic Capacitors and Their Applications

A technology of electrolytic capacitors and additives, applied in the direction of electrolytic capacitors, capacitors, capacitor electrolytes/absorbents, etc., can solve the problems of insufficient suppression of leakage current and leakage current, and achieve the effect of excellent withstand voltage and low leakage current

Active Publication Date: 2021-10-22
SANYO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in conventional hybrid electrolytic capacitors, the suppression of leakage current, especially the suppression of leakage current in a high-temperature environment is not sufficient.

Method used

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  • Additives for Electrolytic Capacitors and Their Applications
  • Additives for Electrolytic Capacitors and Their Applications
  • Additives for Electrolytic Capacitors and Their Applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213]

[0214] Into a flask equipped with a stirrer, a thermometer, and a cooling tube, 30 parts by weight of toluene [manufactured by Wako Pure Chemical Industry Co., Ltd.] and 9.5 parts by weight (132 mmol (hereinafter, referred to as mmol)) of acrylic acid [Wako Pure Chemical Co., Ltd. Pharmaceutical Industry Co., Ltd.] and 4.6 parts by weight (40 mmol) of 2-hydroxyethyl acrylate [Wako Pure Chemical Industries Co., Ltd.] were heated to 80° C. while stirring. A solution obtained by dissolving 0.9 parts by weight of azobisisobutyronitrile [manufactured by Wako Pure Chemical Industries, Ltd.] in 5 parts by weight of toluene was added dropwise there over 3 hours. After completion of the dropwise addition, in a state maintained at 80° C., it was further heated with stirring for 3 hours. Thereafter, toluene was distilled off by heating to 100° C. under a reduced pressure of 0.5 kPa, and a polymer (A-1) having a hydrophilic group was synthesized to produce an electrolytic capac...

Embodiment 2

[0215]

[0216] In Example 1, the ethylenically unsaturated monomer having a hydrophilic group was changed to a monomer described in Table 1, except that, the same procedure was carried out as in Example 1 to prepare a polymer containing a hydrophilic group ( A-2) The additive (P-2) for electrolytic capacitors. The Mn of the polymer (A-2) was 5,300, and the Tg was 11°C.

Embodiment 3

[0217]

[0218] In Example 1, the ethylenically unsaturated monomer having a hydrophilic group was changed to a monomer described in Table 1, except that, the same procedure was carried out as in Example 1 to prepare a polymer containing a hydrophilic group ( A-3) Additive (P-3) for electrolytic capacitors. The Mn of the polymer (A-3) was 5,500, and the Tg was 4°C.

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Abstract

The present invention is an additive for electrolytic capacitors, which is used for electrolytic capacitors including a solid electrolyte layer, the additive for electrolytic capacitors contains a polymer (A) having a hydrophilic group, the hydrophilic group of the polymer (A) The concentration based on the weight of the polymer (A) is below 18 mmol / g, and the solubility parameter of the polymer (A) is 12 (cal / cm 3 ) 1 / 2 above. According to the present invention, it is possible to provide an additive for an electrolytic capacitor having a low leakage current and excellent withstand voltage, and an application thereof.

Description

technical field [0001] The invention relates to an additive for an electrolytic capacitor, a conductive polymer dispersion liquid, an electrolytic solution and an electrolytic capacitor. Background technique [0002] In recent years, along with miniaturization of electronic products, a small and high-capacity high-frequency capacitor is required. As such a capacitor, the development of an electrolytic capacitor having a small equivalent series resistance (hereinafter abbreviated as ESR (equivalent series resistance)) and excellent frequency characteristics has been advanced. An electrolytic capacitor includes an anode foil made of aluminum, tantalum, or the like, a dielectric layer of aluminum oxide, tantalum oxide, or the like formed on the anode foil, and a cathode foil. Among them, an electrolytic capacitor in which a solid electrolyte layer including a conductive polymer as a cathode material is formed on a dielectric layer is called a solid electrolytic capacitor. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/025H01G9/035
CPCH01G9/025H01G9/035
Inventor 赤泽庆彦田边史行内桥贤吾芝隆宏向井孝夫
Owner SANYO CHEM IND LTD