PROCESS FOR PRODUCTION OF ZINC OXIDE FINE-PARTICLE POWDER

摘要

[PROBLEM] It is to provide a production method of zinc oxide powder excellent in UV protection ability and transparency and to provide cosmetics containing the same. [MEANS TO SOLVE THE PROBLEM] The fine particle zinc oxide powder is produced by subjecting either an aqueous solution containing both a water-soluble zinc salt and a carboxylic acid or an aqueous solution containing a water-soluble zinc carboxylate to pH adjustment with an alkali carbonate agent and aging the resulting mixture without calcining. The alkali carbonate agent may be 0.1 to 2 mol/L aqueous solution and the carboxylate group is 1 to 5 times in moles with respect to zinc. The pH adjustment can be carried out by dropwise addition of the alkali carbonate aqueous solution at 0.5 to 5 mL/min per 100 mL of either the aqueous solution containing both the water-soluble zinc salt and the carboxylic acid or the aqueous solution containing the water-soluble zinc carboxylate.