Лако-красочные материалы — производство

The whiteness (brightness and mass-tone/color) ofTiO2 pigments depends primarily on the crystalline modification, the purity, and the particle size of the TiO2 (see above). As the absorption band (385 nm) of anatase pigments is shifted into the UV region compared with rutile pigments they have less yellow undertone. Any transition elements present in the crystal structure have an adverse effect on the whiteness, therefore sophisticated manufacturing conditions are of high importance. Thus, pigments produced by the chloride process (which includes distillative purification of TiCl4 prior to the oxidation step) have higher color purity and very high brightness values.