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Conductive paste for internal electrode of laminated ceramic capacitor

A technology of ceramic capacitors and internal electrodes, which is applied to fixed capacitor electrodes, components of fixed capacitors, conductive materials dispersed in non-conductive inorganic materials, etc. The effect of eliminating chip corrosion and low cost

Active Publication Date: 2011-08-31
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although this solvent dries quickly, it does not have enough sheet corrosion avoidance

Method used

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  • Conductive paste for internal electrode of laminated ceramic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0099] (manufacturing of organic media)

[0100] Using ethylene glycol monobutyl ether acetate or dipropylene glycol methyl ether acetate shown in Table 1 as an organic solvent, ethyl cellulose resin was dissolved therein to prepare an organic medium used in the paste for internal electrodes.

[0101] Each solvent was heated to a temperature of 60° C. with a heater, stirred with a stirring paddle, and ethyl cellulose resin was slowly added to dissolve, thereby obtaining an organic medium. In order to confirm that the resin is completely dissolved, a part of the dissolved material is taken out, and it is confirmed that there is no residue of the resin on the specimen.

[0102] The content of ethyl cellulose was 15 parts by weight relative to 100 parts by weight of all solvents. As ethyl cellulose, grades STD-45 and STD-300 manufactured by Dow Chemical Co. were mixed and used, and the mixing ratio of the two was adjusted so as to have a predetermined viscosity to prepare an org...

Embodiment 3～10

[0115] (Examples 3-10) (Comparative Examples 9-10)

[0116] As the first solvent, ethylene glycol monobutyl ether acetate was used, and as the second solvent, dihydroterpineol acetate, isobornyl propionate, isobornyl butyrate, and isobornel isobutyrate were used. Brain esters were mixed in various ratios to prepare mixed solvents, and conductive pastes were prepared in the same manner as in Examples 1 and 2 (Examples 3-10).

[0117] In addition, using ethylene glycol monobutyl ether acetate as the first solvent and terpineol as the second solvent, conductive pastes were also prepared in the same manner (Comparative Examples 9 to 10).

[0118] Table 2 shows the evaluation results of the dryness, sheet corrosion, and sheet peeling tests of the conductive pastes prepared using various mixed solvents.

[0119] Table 2

[0120]

first solvent

second solvent

solvent

weight ratio

60℃-1min

dryness

piece

corrosion

...

Embodiment 11～18

[0126] (Examples 11-18) (Comparative Examples 11-12)

[0127] As the first solvent, dipropylene glycol methyl ether acetate was used, and as the second solvent, dihydroterpineol acetate, isobornyl propionate, isobornyl butyrate, and isobornyl isobutyrate were used , mixed in various ratios to prepare mixed solvents, and similarly to Examples 1 and 2 to prepare conductive pastes (Examples 11-18).

[0128] In addition, using dipropylene glycol methyl ether acetate as the first solvent and terpineol as the second solvent, conductive pastes were also prepared in the same manner (Comparative Examples 11 to 12).

[0129] Table 3 shows the evaluation results of the dryness, sheet corrosion, and sheet peeling tests of the conductive pastes prepared using various mixed solvents.

[0130] table 3

[0131]

first solvent

second solvent

solvent weight

Proportion

60℃-1min

dryness

piece

corrosion

peel off

te...

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Abstract

The invention provides a conductive paste for an internal electrode of a laminated ceramic capacitor. Even if a green slice of the laminated ceramic capacitor is as thin as 2-5mum, the green slice can eliminate the slice corrosion caused by the conductive paste, has better dryness, and can effectively inhibit troubles caused by the slice corrosion. The conductive paste for the internal electrode of the laminated ceramic capacitor is used for printing on a green slice of a dielectric medium containing polyvinyl butyral resin and comprises conductive powder (A), organic resin (B) and an organic solvent (C), wherein the organic solvent (C) comprises at least one solvent selected from ethylene glycol butyl ether acetate and dipropylene glycol methyl ether acetate. The invention also provides the conductive paste for the internal electrode of the laminated ceramic capacitor, which comprises a mixed solvent of at least one solvent selected from dihydroterpineol acetate, isobornyl propanoate, isobornyl butyrate and isobornyl isobutyrate in the organic solvent.

Description

technical field [0001] The present invention relates to a conductive paste for internal electrodes of multilayer ceramic capacitors. More specifically, it relates to the elimination of sheet corrosion caused by the conductive paste even when green sheets of multilayer ceramic capacitors are as thin as 2 to 5 μm, Furthermore, it is a conductive paste for multilayer ceramic internal electrodes that has good drying properties and can effectively suppress troubles caused by it. Background technique [0002] In electronic equipment represented by mobile phones and digital equipment, electronic components used in them have been thinned and miniaturized in recent years, and multilayer ceramic capacitors (MLCCs), which are chip components, are also being miniaturized and increased in capacity. [0003] Inside the multilayer ceramic capacitor, a laminated body in which a dielectric and internal electrodes overlap alternately is provided, and external electrodes are attached to both e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/008H01B1/20H01B1/22C08L1/28C08K3/08C08K3/10
Inventor 石山直希
Owner SUMITOMO METAL MINING CO LTD
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