US 12,221,355 B2
Titanium oxide particles and manufacturing method therefor
Masanori Tomonari, Osaka (JP); Kiyonobu Ida, Osaka (JP); and Takuya Hosokawa, Osaka (JP)
Assigned to ISHIHARA SANGYO KAISHA, LTD., Osaka (JP)
Appl. No. 16/980,456
Filed by ISHIHARA SANGYO KAISHA, LTD., Osaka (JP)
PCT Filed Mar. 27, 2019, PCT No. PCT/JP2019/013090
§ 371(c)(1), (2) Date Sep. 14, 2020,
PCT Pub. No. WO2019/189307, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-062355 (JP), filed on Mar. 28, 2018.
Prior Publication US 2021/0017037 A1, Jan. 21, 2021
Int. Cl. C01G 23/053 (2006.01)
CPC C01G 23/0536 (2013.01) [C01P 2004/52 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2006/12 (2013.01)] 12 Claims
 
1. A method for manufacturing titanium oxide particles, comprising:
a step of hydrolyzing a titanium (oxy)chloride by neutralization by mixing a solution containing a carboxylic acid and the titanium (oxy)chloride with an alkali in a range of 1 to 200 mol % relative to an amount of the titanium (oxy)chloride; and
a step of thermally hydrolyzing the titanium (oxy)chloride remaining in the solution after hydrolyzing the titanium (oxy)chloride by neutralization by heating the solution after hydrolyzing the titanium (oxy)chloride by neutralization at a temperature of 80° C. or more to 110° C. or less to form the 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 %.