Patent ID: 7371276

Claim:
A method for producing an anatase type titanium dioxide pigment comprising, a single calcining step, wherein particles of a hydrous titanium oxide are introduced into a rotary kiln having a temperature of not lower than 800° C. and lower than 1000° C. in the presence of calcination treating agents, said calcination treating agents including an aluminum compound corresponding to 0.02-0.2% by weight calculated as Al 2 O 3 , a potassium compound corresponding to 0.2-1% by weight calculated as K 2 O and a phosphoric acid compound corresponding to 0.02-0.5% by weight calculated as P 2 O 5 based on the weight of TiO 2 in the hydrous titanium oxide, the ratio K 2 O/P 2 O 5 being in the range of 1.5/1-10/1.