Published online by Cambridge University Press: 14 June 2019
Precipitation and crystallization are the key production steps for shaping the application properties of pigments. Although the technical features of the particle-formation technologies and process design considerations applied for pigment synthesis are quite similar to those for other sparingly soluble substances, some unique differences exist. These differences are to a large extent related to the special application properties of pigments, that is, the coloristic quality of pigments; pigment stability toward light, weather, heat, and chemicals; and their dispersability in application media. To facilitate a better understanding of how the operating conditions applied during precipitation and crystallization control the application properties, this chapter starts with a detailed discussion on the different types of pigments and their properties in Section 16.2. In particular, the discussion is focused on color. Some theoretical background on color perception and color systems is given with the aim of providing the fundamentals for understanding the quality characteristics of pigments. Moreover, it is discussed in some detail how pigment coloristic properties can depend on particle size, and some aspects of the influence of particle size, particle size distribution, and particle morphology on color are also discussed. However, a thorough understanding of these influences is not fully established, and this is still an important field of ongoing research that is aimed at providing solid and rational foundations to pigment particle technology.
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