METHOD FOR PRODUCING SILICA PARTICLE AND METHOD FOR PRODUCING SILICA SOL

To provide a method for producing silica particles having a low refractive index.SOLUTION: A method for producing silica particles comprises subjecting tetra-alkoxysilane to a hydrolysis reaction and a condensation reaction, the hydrolysis reaction and the condensation reaction have a reaction temperature of 28°C or lower from a start of a reaction to the end of the reaction, the hydrolysis reaction and the condensation reaction have a concentration of the alkali catalyst of 0.95 mass% or less in the reaction solution from the start of the reaction to the end of the reaction, and the method for producing silica sol comprises the method for producing the silica particles.SELECTED DRAWING: None 【課題】低屈折率を有するシリカ粒子の製造方法を提供する。【解決手段】テトラアルコキシシランを加水分解反応及び縮合反応させるシリカ粒子の製造方法であって、前記加水分解反応及び縮合反応の反応開始から反応終了までの反応温度が２８℃以下であり、前記加水分解反応及び縮合反応の反応開始から反応終了までの反応液のアルカリ触媒の濃度が０．９５質量％以下である、シリカ粒子の製造方法、及びこれを含むシリカゾルの製造方法。【選択図】なし