Patent ID: 9376319
Filing Date: 2016-06-28
CPC Classification: A61K,A61Q,B82Y,C01B,C01G,C01P,C09C,C09K,Y10T

Claim Text:
1. A method for production of rounded zinc oxide particles which have an average particle diameter of 0.1 μm or more and an aspect ratio of 2.0 or less, comprising a step (1) of treating zinc oxide particles with hydrogen peroxide, in which raw material zinc oxide particles are repulped in water to prepare a slurry of raw material zinc oxide particles in a concentration of 10 to 2000 g/l in terms of zinc oxide, an aqueous hydrogen peroxide solution in a concentration of 1 to 500 g/l in terms of hydrogen peroxide is added to the slurry, and the mixture is stirred, and a step (2) of calcinating and thereby thermally decomposing the zinc peroxide obtained in the step (1).