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Conductive paste having stable viscosity over time

A conductivity and paste technology, applied in the field of conductive paste, can solve problems such as quality deterioration, viscosity increase, particle aggregation, etc.

Active Publication Date: 2020-10-30
NORITAKE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of the particle size of the conductive powder essentially leads to the aggregation of the particles, which causes quality deterioration (such as an increase in viscosity over time) during storage of the conductive paste.

Method used

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  • Conductive paste having stable viscosity over time
  • Conductive paste having stable viscosity over time
  • Conductive paste having stable viscosity over time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0085] Ni powder with an average particle size of 0.18 μm and barium titanate powder with an average particle size of 0.05 μm were dispersed in a carrier together with a dispersant and a thickening inhibitor, and kneaded with a three-roll mill to prepare the products of Examples 1 to 13. conductive paste.

[0086] In addition, a carrier can be prepared by mixing a binder and an organic solvent, and processing it, stirring suitably for about 5 hours at 100 degreeC. Ethyl cellulose was used as a binder, isobornyl acetate was used as an organic solvent, a carboxylic acid-based dispersant was used as a dispersant, and a secondary amine shown in the following Table 1 was used as a thickening inhibitor. In addition, the composition of each component in the conductive paste is as follows: Ni powder: 50 mass %, barium titanate powder: 12.5 mass % (25 mass % of Ni powder), binder: 2.0 mass %, carboxylic acid dispersion Agent: 0.64 mass %, secondary amine: 0.5 mass %, and the remainder...

Embodiment approach 2

[0101] The Ni powder and the barium titanate powder were dispersed in an organic solvent together with a binder, a dispersant, and a thickening inhibitor, and were kneaded with a three-roll mill to prepare the conductive pastes of Examples 14 to 31.

[0102] Ethyl cellulose was used as a binder, isobornyl acetate was used as an organic solvent, a carboxylic acid-based dispersant was used as a dispersant, and the amine-based compounds shown in Table 2 below were used as a thickening inhibitor. In addition, the composition of each component in the conductive paste is as follows: Ni powder: 50 mass %, barium titanate powder: 12.5 mass % (25 mass % of Ni powder), binder: 2.0 mass %, carboxylic acid dispersion Agent: 0.9% by mass, amine compound: refer to Table 2 below, and the remainder is solvent.

example 14～20

[0104] In the conductive pastes of Examples 14 to 20, as in Embodiment 1, powders having an average particle diameter of 0.18 μm and 0.05 μm were used as the Ni powder and the barium titanate powder, respectively. Moreover, as an amine compound, n-dibutylamine was used, and the compounding quantity was changed as shown in following Table 2 between 0 mass % - 2.00 mass %.

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Abstract

The present invention provides a conductive paste which is suppressed in increase of the viscosity during storage, thereby having further enhanced viscosity stability. The present invention provides aconductive paste which contains a conductive powder, a binder, a thickening inhibitor and a dispersion medium. The thickening inhibitor is a secondary amine compound which is represented by general formula NHR1R2. In the formula, each of R1 and R2 independently represents a linear or cyclic aliphatic group having 4-12 carbon atoms, and carbon chains in the R1 and R2 moieties do not contain a nitrogen atom and an oxygen atom.

Description

technical field [0001] The present invention relates to a conductive paste capable of forming a conductive layer. [0002] This application claims priority based on Japanese Patent Application No. 2018-050965 for which it applied on March 19, 2018, and the entire content of this application is incorporated in this specification as a reference. Background technique [0003] Along with the reduction in size and weight of electronic devices, reduction in size and thickness is also required for each electronic component constituting the electronic device. As an example, a multilayer ceramic capacitor (Multi-Layer Ceramic Capacitor: MLCC) has a structure in which dielectric layers made of ceramics and internal electrode layers are laminated in multiple layers. In MLCCs, it is required to reduce the size of the MLCC and increase the capacitance by further reducing the thickness of the dielectric layer and increasing the number of layers to increase the electrode area. [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/20B22F1/00B22F9/00H01B1/22H01G4/30
CPCB22F1/00H01B1/20H01G4/30B22F9/00H01B1/22
Inventor 河方信吾小川昌辉中村泰辅金子太地
Owner NORITAKE CO LTD
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