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Title:
SILVER POWDER AND PASTE USING THE SAME
Document Type and Number:
Japanese Patent JP2007224422
Kind Code:
A
Abstract:

To provide a method for producing silver powder where, as shown in the conventional method in which a dispersant is added to a reaction liquid before reduction, there occurs no unreduction reaction in accordance with the additional amount thereof, the kinds and amounts of a dispersant are not limited, and further, silver powder having excellent dispersibility can be obtained, and to provide the silver powder.

The silver powder is produced by adding a reducing agent-containing aqueous solution to an aqueous reaction system comprising either or both of a silver complex salt and silver oxide at a rate of ≥1 equivalent/min, reducing the same, thereafter filtering and water-washing the silver powder-containing slurry, so as to obtain a wet cake having a water content of 20 to 80%, and subjecting the wet cake to mixing and pulverizing in a mixer or to mixing and pulverizing together with a dispersant in a mixer, and has a tap density of ≥2 g/cm3, a mean particle diameter of 0.1 to 5 μm according to a laser diffraction process, and a specific surface area of ≤5 m2/g.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
NOGAMI TOKUAKI
SAWAI TAKAYUKI
ITABASHI TOSHIMUNE
Application Number:
JP2007061206A
Publication Date:
September 06, 2007
Filing Date:
March 12, 2007
Export Citation:
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Assignee:
DOWA HOLDINGS CO LTD
DOWA HIGHTECH CO LTD
International Classes:
B22F1/00; B22F9/24; H01B1/22; H01B5/00
Domestic Patent References:
JPH0776710A1995-03-20
Attorney, Agent or Firm:
Kenji Wada
Komatsu Taka