Titanium dioxide pigments
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Gerhard Pfaff
Abstract
Titanium dioxide (TiO2) is by far the most important white pigment. The extraordinary scattering behavior of TiO2 together with the lack of absorption in the visible range and the stability in different application systems is the reason why TiO2 is the most commonly used pigment. Of the three TiO2 modifications, only rutile and anatase play a role for pigment uses, whereas brookite has no technical importance. Two main processes are used for the production of TiO2 pigments, the sulfate process and the chloride process. Many TiO2 pigments are equipped with an additional surface treatment (aftertreatment) to improve weather resistance and lightfastness of the pigment itself and of the pigmented organic matrix. A second aim of the surface treatment is the improvement of the dispersibility of the pigments in the application system.
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