PROBLEM TO BE SOLVED: To provide dyestuff and/or pigment-including metal oxide particles, neither easily falling off and eluting the dyestuff and/or pigment nor discoloring (color-changing).SOLUTION: The dyestuff and/or pigment-including metal oxide particles are produced by: (a) preparing metal oxide particle precursor particles by spray drying in hot air flow, a predetermined hydrolyzed polycondensate dispersion of the dyestuff and/or pigment, obtained by dispersing the dyestuff and/or pigment in a specific hydrolyzed polycondensate, in which the average molecular weight of the hydrolyzed polycondensate is in a range of 500 to 100,000, the total solid concentration is in a range of 5 to 100 wt.% and the ratio (CH)/(CD) of the concentration (CD) of the dyestuff and/or pigment as a solid part to the concentration (CH) of the hydrolyzed polycondensate as a solid part is in a range of 0.0002 to 2.3 and (b) dry/heat-treating the precursor particles.COPYRIGHT: (C)2013,JPO&INPIT【課題】染料および/または顔料が容易に脱落あるいは溶出したり、褪色(変色)することがない、染料および/または顔料内包金属酸化物粒子の提供。【解決手段】(a)染料および/または顔料が分散した特定の加水分解縮重合物分散液であって、該加水分解縮重合物の平均分子量が500~100,000の範囲にあり、全固形分濃度が5~100重量%の範囲にあり、染料および/または顔料の固形分としての濃度(CD)と加水分解縮重合物の固形分としての濃度(CH)との比(CD)/(CH)が0.0002~2.3の範囲にある染料および/または顔料の加水分解縮重合物分散液を熱風気流中に噴霧乾燥して金属酸化物粒子前駆体粒子を調製し、(b)この前駆体粒子を乾燥・加熱処理することによって製造される。【選択図】なし
