INDIUM-TIN OXIDE POWDER FOR SHIELDING ULTRAVIOLET AND NEAR INFRARED RAYS, ULTRAVIOLET AND NEAR-INFRARED RAY-SHIELDING GLASS AND PRODUCTION THEREOF

摘要

PURPOSE:To obtain the powder particles which is suitably useful as a pigment for screening UV rays and near-IR rays from the window panes of architectures and cars because of its excellent UV and near-IR screening effect by specifying the average particle sizes, a tin content, the color of the powder and dust resistance to specific values, respectively. CONSTITUTION:This powder particles has 0.01-0.05mum average particle diameter, 1-15wt.% of tin content, 20Y50, 0.25x0.3, 0.25y0.32 powder color where (Y is tristimulus value, x, y are chromaticity coordinates), 0.05-0.5OMEGA.cm dust resistance (100kg/cm2). In order to set the values of the powder color and the dust resistance to above-specified values, it is recommended that the ultrafine particles of indium-tin oxide (ITO) are subjected to reduction treatment where preferably the color is changed to deep blue to dark blue. In an actual embodiment, the tin content is 8.5wt.%, the ultrafine particles of ITO of 0.03mum average particles are heated at 380 deg.C, then a methanol-containing N2 gas is passed through for 80 minutes to effect the reduction treatment to provide the power of 0.18OMEGA.cm powder resistance.