DEGRADABLE ZINC OXIDE POWDER AND PROCESS FOR PRODUCTION THEREOF

摘要

The method for producing a disintegratable zinc oxide powder of the present invention is characterized by comprising: neutralizing an aqueous solution containing a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate with an alkali carbonate to produce precipitate; and firing the precipitate to obtain zinc oxide powder. As a water-soluble zinc salt, zinc chloride or zinc acetate is preferably used. As an acid, acetic acid is preferably used. As an alkali carbonate, sodium carbonate is preferably used. The disintegratable zinc oxide powder has the morphology in which the primary particles of zinc oxide are aggregated to form secondary particles, and these secondary particles are further aggregated to form the zinc oxide powder. The powder can achieve excellent UV protection capability, excellent transparency, and excellent feeling in use through its disintegration. Also, it has good usability and good handling properties.