Effect pigments with a strong colour flop

摘要

Effect pigments with a colour flop comprise SiO2 laminars coated with metal oxides and with unit layer thickness. The colour flop extends through all four quadrants of the a,b-colour coordinate system (L,a,b-system according to CIELAB). The layer thickness tolerance of the SiO2 laminar with a unit layer thickness comes to 3-10% of the overall dry layer thickness of the particles. The thickness of the SiO2 is 520-560 nano-meters, and the diameter between 1 and 250 micrometers. An independent claim is also included for the manufacture of effect pigments as above where SiO2 laminars with a unit thickness layer are coated with metal oxides