PROBLEM TO BE SOLVED: To provide a method of manufacturing a flaky zinc oxide powder that can stably manufacture flaky zinc oxide particles excellent in optical characteristics even in the large scale of at least 20 L of a raw material capacity.SOLUTION: The method of manufacturing the flaky zinc oxide powder includes a process in which alkali of 2.0-3.0 of a molar ratio to the zinc salt is added to a mixture including a zinc salt and water as an alkali solution under the agitation condition in which (a) of the following formula (1) becomes at least 0.45 for 30-70 seconds of an adding time. Is(&theta)=e-a&theta (1). In the formula (1), Is(&theta) denotes separation strength, (e) denotes the base of natural logarithm, and &theta denotes the mixing time (unit: second) from the beginning of the mixing.COPYRIGHT: (C)2012,JPO&INPIT【課題】原料容量が20L以上もの大スケールにおいても、光学特性が優れた薄片状酸化亜鉛粒子を安定して製造しうる、薄片状酸化亜鉛粉末の製造方法を提供する。【解決手段】亜鉛塩及び水を含む20L以上の混合物に、下記式(1)におけるaが0.45以上となる攪拌条件下で、該亜鉛塩に対してモル比2.0~3.0のアルカリを、アルカリ溶液として添加時間30~70秒で添加する工程を有する、薄片状酸化亜鉛粉末の製造方法。Is(θ)=e-aθ (1)(式(1)中、Is(θ)は分離強度、eは自然対数の底、θは混合開始からの攪拌時間(単位:秒)を表す。)【選択図】なし
