Alongside colouring agents for polymers, additives have an important role: they improve certain properties of polymers and enable easier handling of plastic products. Similar to colouring agents, there are various different options for additives to polymers. In many fields, preference is given to additive masterbatches – beside the use of treated raw materials.
Where colouring agents are concerned, a differentiation is made between dyes and pigments, with the latter being of much greater importance in the plastics sector. Pigment particles (primary particles) – as they are usually generated in manufacture – have strong forces of attraction, due to their extremely small particle sizes. Consequently, primary particles gather to form so-called aggregates.