Patent ID: 8168157
Filing Date: 2012-05-01
Classification: A61K,A61Q,B82Y,C01G,C01P,C09C

Abstract:
1. A production method of fine particle zinc oxide powder comprising steps of: dropwise adding an alkali carbonate agent to 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 adjust the pH of the mixture, wherein the pH adjustment is 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; and aging the resulting mixture without calcining to produce fine particle zinc oxide powder.