| 摘要 |
PROBLEM TO BE SOLVED: To obtain indium tin oxide (ITO) microparticles for forming a daylight screening film having high transmittance of visible light, low transmittance of daylight and low haze, to obtain a coating liquid capable of forming a film by a simple coating method without using physical film forming method of high cost, and to obtain a daylight screening film using this. SOLUTION: This ITO microparticles are characterized by having <=100 nm average particle size, and a powder color according to L*a*b* colorimetric system (JIS Z8729) of 20 to 52 L*, -4.4 to -0.1 a* and -10 to -3 b*. This coating liquid for forming a daylight screening film is a dispersion of the ITO microparticles in a solvent where a resin binder or an inorganic binder is added. This method for producing ITO microparticles comprises treating ITO microparticles having <=100 nm average particle size at 200 to 300 deg.C for >=10 minutes under inert atmosphere containing an alcohol or, after reducing residual impurities comprising chloride ion, nitrate ion and sulfate ion to 0.6% or less, under inert gas or inert gas containing an alcohol.
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