Лако-красочные материалы — производство

11.5.1

General Properties

A broad spectrum of solid-state shades ranging from yellow to blue-violet have been accomplished by exchanging the substituents in the phenyl rings of the DPP chromophoric unit. Most DPP pigments display high color strength, the high smax values being additional testimony to this. The level of light — and weather fastness of such pigments is in general excellent both in full shades and white reductions making the DPP pigments very suitable for automotive and industrial coatings. Despite their low molecular weights, the diaryl-1,4-diketo-pyrrolo-pyrroles are highly insoluble and remarkably resistant to migration, even when carrying other­wise solubilizing alkyl substituents, such as the tertiary butyl group. The DPP pig­ments also show good to excellent thermal stability surpassing 400 °C (TGA) and allowing for use in plastics and fibers applications, mainly polyolefins. A major and striking feature of many DPP pigments compared to other pigment classes is the high chroma observed in the applications, which is related to the high purity of the compounds and the relatively sharp absorption bands.

11.5.2