Patent ID: 8802159

Claim:
A production method of an anatase-type titanium oxide sol, comprising the processes (a) to (c): (a) mixing a titanium alkoxide, an organic acid, and a quaternary ammonium hydroxide with water in a molar ratio of the organic acid of 0.4 to 4.0 relative to 1 mol of a titanium atom of the titanium alkoxide and in a molar ratio of the quaternary ammonium hydroxide of 0.8 to 1.9 relative to 1 mol of the organic acid to prepare an aqueous mixed solution having a concentration in terms of TiO 2 of 0.5 to 10% by mass; (b) heating the aqueous mixed solution to 50 to 100° C. to remove an alcohol to prepare a titanium-containing aqueous solution; and (c) subjecting the titanium-containing aqueous solution to a hydrothermal treatment at 110 to 170° C.