PRODUCTION OF ANTIMONY DOPED TIN OXIDE POWDER AND COATING MATERIAL CONTAINING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain an antimony doped tin oxide powder having high conductivity and dispersibility even using tervalent antimony without using an oxidizing agent by treating a fine particulate slurry containing hydrous oxides of tetravalent tin and tervalent antimony with supercritical water. SOLUTION: A slurry applied for the treatment is preferably the one containing hydrates of tin and antimony in a fine particulate state of =0.2 m average particle diameter. The fine particulate slurry of the hydrous oxides is obtained by hydrolyzing a hydrolyzable tin compound and an antimony compound in the same vessel to coprecipitate the hydrous oxides of tin and antimony. The ratio of the tin compound to the antimony compound is preferably 0.02-0.2 in the atomic ratio Sb/(Sn+Sb). The hydrothermic treatment of a dispersion of the coprecipitate is carried out at a higher temp. than the critical temp. (374 deg.C) of water. The preferable temp. of the hydrothermic treatment is 380-450 deg.C. The time is usually 10 sec to 1 hr. The pH of dispersion is preferably =4.