PROBLEM TO BE SOLVED: To provide a method for producing pigment-including silica particles, pigment-including silica particles obtained by the method, and a use of the particles.SOLUTION: The method for producing pigment-including silica particles includes the steps of: (a) preparing pigment-including silica particle precursor particles by atomizing a pigment-dispersed alkali silicate aqueous solution into hot air flow followed by drying (b) immersing the pigment-including silica particle precursor particles in an acid aqueous solution to remove the alkali and (c) drying and heat-treating the resulting particles. The mole ratio of SiO2/M2O (M represents alkali metal) of the pigment-dispersed alkali silicate aqueous solution is in the range of 1 to 5, SiO2 concentration (CS) is in the range of 1 to 30 wt.%, and the ratio (CD)/(CS) of pigment concentration (CD) to SiO2 concentration (CS) is in the range of 0.005-2.3.COPYRIGHT: (C)2013,JPO&INPIT【課題】顔料内包シリカ系粒子の製造方法および顔料内包シリカ系粒子ならびに該粒子の用途を提供する。【解決手段】下記の工程(a)~(c)からなることを特徴とする顔料内包シリカ系粒子の製造方法。(a)顔料分散珪酸アルカリ水溶液を熱風気流中に噴霧乾燥して顔料内包シリカ系粒子前駆体粒子を調製する工程。(b)顔料内包シリカ系粒子前駆体粒子を酸水溶液に浸漬し、アルカリを除去する工程。(c)乾燥・加熱処理する工程。前記顔料分散珪酸アルカリ水溶液の、SiO2/M2Oモル比(但し、Mはアルカリ金属を示す。)は1~5の範囲にあり、SiO2濃度(CS)が1~30重量%の範囲にあり、顔料濃度(CD)とSiO2濃度(CS)との比(CD)/(CS)が0.005~2.3の範囲にあることを特徴とする顔料内包シリカ系粒子の製造方法。【選択図】なし
