| 摘要 |
Multilayer pearlescent pigments comprising platelet-shaped transparent substrates provided with an optically active coating, where the optically active coating includes at least a) an absorbing high-index layer A having a refractive index n≧1.8 b) a low-index layer B having a refractive index n<1.8 c) a high-index layer C having a refractive index n≧1.8 and also d) optionally at least one outer protective layer D and where the multilayer pearlescent pigments have a cumulative frequency distribution of a volume-averaged size distribution function, with the indices D10, D50, D90 and a span &Dgr;D in a range from 0.7-1.4, the span &Dgr;D being calculated in accordance with formula (I) &Dgr;D=(D90−D10)/D50  (I). The disclosure further relates to a method for producing these multilayer pearlescent pigments, and also to their use. |
