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AssigneeIshihara Sangyo Kaisha, Ltd.
InventorsMasanori Tomonari, Kiyonobu Ida, Takuya Hosokawa
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The present invention manufactures titanium oxide particles that have a small degree of aggregation (size of aggregate particle diameter relative to primary particle diameter) and are not readily sintered by heating. The present invention has: a step in which an alkali and a solution including a carboxylic acid and a titanium (oxy)chloride are mixed, and the titanium (oxy)chloride is hydrolyzed by neutralization; and a step in which, after the hydrolysis by neutralization, the solution is heated to a temperature of 80° C. or more and 110° C. or less, and the titanium (oxy)chloride remaining in the solution is hydrolyzed by heating. It is thus possible to obtain titanium oxide particles that have a small degree of aggregation and a range of 1-35 for the ratio (D90/BET diameter) between the 90% cumulative mass particle size distribution diameter (D90) (nm) as measured by a dynamic light-scattering particle diameter distribution measurement device and the BET diameter (nm) as calculated from the specific surface area of the titanium oxide particles.
A method for manufacturing titanium oxide particles, comprising:
Titanium oxide particles having a ratio (D90/BET diameter) of a 90% cumulative volume particle size distribution diameter (D90) (nm) of the titanium oxide particles measured by a dynamic light scattering particle size distribution analyzer to a BET diameter (nm) calculated from a specific surface area of the titanium oxide particles is in a range of 1 to 35 and a content of carbon contained in the titanium oxide particles is in a range of 0.4 to 10 mass %.
The titanium oxide particles according to 5, wherein a rutile ratio after the titanium oxide particles are heated at 600° C. for 2 hours is 10% or less.
The titanium oxide particles according to 5, wherein a BET specific surface area of the titanium oxide particles is 100 to 400 m2/g.
The titanium oxide particles according to 6, wherein a BET specific surface area of the titanium oxide particles is 100 to 400 m2/g.
Titanium oxide particles having a ratio (D90/BET diameter) of a 90% cumulative volume particle size distribution diameter (D90)(nm) of the titanium oxide particles measured by a dynamic light scattering particle size distribution analyzer to a BET diameter (nm) calculated from a specific surface area of the titanium oxide particles is in a range of 1 to 35 and a content of carbon contained in the titanium oxide particles is in a range of 0.4 to 10 mass %, formed by the process comprising:
Dependencies are inferred from the claim text.