PROBLEM TO BE SOLVED: To provide a method for producing a dye-including silica-based particle which causes no bleeding and is excellent in lubricity.SOLUTION: This method for producing a dye-including silica-based particle includes the steps of: (a) preparing a dye-including silica-based particle precursor particle by spray-drying a dye-including alkali silicate aqueous solution in a hot air flow (b) immersing the dye-including silica-based particle precursor particle into an acid aqueous solution to remove alkalis and (c) performing drying/heating treatment. In the dye-including alkali silicate aqueous solution, an SiO2/M2O molar ratio (where, M represents alkali metal) is in a range of 1-5, SiO2 concentration (CS) is in a range of 1-30 wt.%, and a concentration ratio (CD)/(CS) between dye concentration (CD) and the SiO2 concentration (CS) is in a range of 0.0002-1.COPYRIGHT: (C)2013,JPO&INPIT【課題】滲みを生ぜず、滑性に優れた、色素内包シリカ系粒子の製造方法の提供。【解決手段】(a)色素含有珪酸アルカリ水溶液を熱風気流中に噴霧乾燥して色素内包シリカ系粒子前駆体粒子を調製する工程、(b)色素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、および、(c)乾燥・加熱処理する工程、からなる色素内包シリカ系粒子の製造方法。該色素含有珪酸アルカリ水溶液は、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、色素濃度(CD)とSiO2濃度(CS)との濃度比(CD)/(CS)が0.0002~1の範囲にある。【選択図】なし
