| abstract |
Rutile TiO2 pigment particles bearing coatings comprising: (a) an inner layer comprising about 0.05-1 percent by weight, based on the weight of the TiO2, of cerium radicals and about a stoichiometric amount of phosphate radicals, based on the amount of cesium radicals, (b) a second layer of about 0.1-4 percent by weight, based on the weight of the TiO2, of amorphous silica, and optionally (c) an outer layer of (1) about 0.5 to 8 percent by weight, based on the weight of the TiO2, of hydrous alumina or (2) hydrous alumina in the amount of about 0.5-8 percent, based on the weight of the TiO2, and associated therewith up to about a stoichiometric amount of phosphate radicals needed to form aluminum phosphate, the combined total weight of said coatings being about 2 to 12 percent by weight, based on the weight of the TiO2. |