High-purity alumina particles and method of producing same, and resin composition for electronic devices and method of producing the same

Abstract

There are provided high-purity alumina particles in which purity is increased by reducing the amount of impurities remaining in alumina particles derived from metallic aluminum and reducing the amount of metallic aluminum itself and a method of producing the same. The content of elemental uranium in the alumina particles derived from metallic aluminum is 5 ppb or less, the content of elemental thorium is 5 ppb or less, the content of metallic aluminum is 5 ppm or less, the content of sodium is 10 ppm or less, and the content of iron is 10 ppm or less, a metallic aluminum powder is put into a flame, vaporized, and oxidized, and the spherical alumina particles are obtained through spheroidization due to surface tension during cooling, the spherical alumina particles are put into a basic solution to dissolve metallic aluminum remaining in the particles, and the spherical alumina particles are dried.

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