Patent ID: 6017967
Filing Date: 2000-01-25
Classification: C25D,H05K

Abstract:
A method for formation of a stable aqueous dispersion of a metal sulfide, said method comprising the step of separately injecting a solution of metal ions and a solution of a sulfur compound into a reactor containing a dispersant and a stabilizer having at least three alkylene oxide groups in a chain and a hydrophilic--lipophilic balance (HLB) in excess of 12, said stabilizer being present in a concentration sufficient to stabilize the dispersion of said metal sulfide, the flow rate of the reactants into the reactor being controlled so as to form a dispersion comprising spherical particles where the particles have a mean diameter of less than 100 nanometers and a particle size distribution where less than 10 percent of the particles within the dispersion have a diameter twice that of the mean diameter of all particles within the dispersion.