Patent Number: 7,786,178

Title: Process for producing fine silver particle colloidal dispersion, fine silver particle colloidal dispersion, and conductive silver film

Abstract: A process for producing a fine silver particle colloidal dispersion which can simply form conductive silver layers and antimicrobial coatings by screen printing or the like. The process is characterized by having a reaction step of allowing an aqueous silver nitrate solution to react with a mixed solution of an aqueous iron(II) sulfate solution and an aqueous sodium citrate solution to form an agglomerate of fine silver particles, a filtration step of filtering the resultant agglomerate of fine silver particles to obtain a cake of the agglomerate of fine silver particles, a dispersion step of adding pure water to the cake to obtain a first fine silver particle colloidal dispersion of a water system in which dispersion the fine silver particles have been dispersed in the pure water, and a concentration and washing step of concentrating and washing the first fine silver particle colloidal dispersion of a water system.

Inventors: Kato; Kenji (Chiba, JP), Yukinobu; Masaya (Chiba, JP)

Assignee: Sumitomo Metal Mining Co., Ltd.

International Classification: B01F 3/12 (20060101); B22F 9/24 (20060101); H01B 13/00 (20060101); H01B 1/22 (20060101)

Expiration Date: 8/31/12018