Patent ID: 9108862
Filing Date: 2015-08-18
Classification: B82Y,C01G,C01P,Y10T

Abstract:
1. A method for preparing rutile TiO 2 particles which comprise generally spherical structures in the range of from 1 to 2 microns in diameter, said structures being aggregates of elongated TiO 2 crystallites, said method comprising: (a) forming an aqueous solution of a soluble titanium compound at a titanium concentration of from 0.5 to 1.0 moles per liter; (b) introducing a morphology controlling agent selected from the group consisting of an α-hydroxy carboxylic acid of the formula R—CH(OH)COOH, an α-hydroxy carboxamide of the formula R—CH(OH)CONH (c) maintaining the stirred solution at a temperature in the range of from 75° C. to 80° C. for a period of from one to 3 hours; (d) elevating the temperature of the stirred solution to a value of from 100° C. to the refluxing temperature and maintaining said temperature for a period of from 2 hours to 4 hours to form a reaction product; (e) optionally neutralizing the stirred solution which results from step (d); (f) cooling the stirred solution to room or ambient temperature; and (h) separating and drying the reaction product.