| 摘要 |
PROBLEM TO BE SOLVED: To suppress the reduction in the reaction yield of the production of silver powder by allowing the silver powder to have a specified grain diameter distribution and to suitably execute its flaking by excellent dispersibility. SOLUTION: Relating to this silver powder, the cumulative 50% grain diameter D50 by a laser diffraction-scattering type grain diameter distribution measuring device is <=2μm, the cumulative 90% grain dimater is <=5μm, and also, the maximum grain diameter in a cumulative grain diameter distribution graph is <=10μm. The production of the silver powder is executed by reducing and precipitating silver grains in an aq. reaction system contg. at least either silver grains or silver oxide and moreover adding a dispersant in the process of the reducing reaction. As the dispersant, a surfactant is preferably used, in particular, the salt of fatty acid is suitable, and its amt. to be added is suitably controlled to 0.5 to 1.5 wt.% based on silver as the object for precipitation. The silver powder can be processed into flaky silver powder used in the fields requiring high electric conductivity by using pulverizing media of <=5 mm such as a ball mill.
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