Plate-shaped alumina powder, its manufacturing method, and coatings and cosmetics containing the plate-shaped alumina powder

Abstract

This invention provides a plate-shaped alumina powder, a method for manufacturing the same, and coatings and cosmetics containing the plate-shaped alumina powder. The plate-shaped alumina powder has few aggregated particles or the aggregated particles are easily dispersed. The plate-shaped alumina powder is composed of a plurality of plate-shaped α-alumina particles with an average thickness of 0.2 μm or more and 3.0 μm or less. After ultrasonic dispersion at an ultrasonic intensity of 600 W, the average particle size (Dp50) is 2 μm or more and 100 μm or less, and the proportion of particles with an average particle size of 3 times the Dp50 (3 × Dp50) or more is 1.5% or less. The invention also provides a method for manufacturing the aforementioned plate-shaped alumina powder and a suitable method for manufacturing the aforementioned plate-shaped alumina powder, as well as coatings and cosmetics containing the aforementioned plate-shaped alumina powder. none

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