METHOD OF MODIFYING PIGMENT TITANIUM DIOXIDE Russian patent published in 1995 - IPC

FIELD: inorganic chemistry. SUBSTANCE: aqueous suspension of pigment containing Al₂O₃ and SiO₂ at the ratio 0.55-0.65/0.35-0.45 is carbonized with a mixture consisting of carbon dioxide and air at 15-30 C and pH of the final suspension 11-9.2. Transient element salts of IV group of Periodic system were added additionally to the suspension, for example, germanium, zirconium, tin, hafnium, lead at concentration 0.1-0.3% to TiO₂. Pigment indices: weatherproofing is 760-840 h, up to the strong chalking, photochemical activity is 0.01-0.08 conditional units, salt content is 0.02-0.07% to TiO₂. EFFECT: improved method of pigment modifying. 3 cl, 1 tbl