Patent ID: 7611574
Filing Date: 2009-11-03
Classification: C01P,C09C,Y10T

Abstract:
1. A process for producing an interference pigment, comprising a flake-form inorganic substrate and at least one FeTiO 3 -containing layer thereon, where the FeTiO 3 is present in a proportion of 8-100% by weight, based on the total weight of the layer, and is homogeneously distributed in the layer, and at least one further layer of metal oxides, metal oxide hydrates, MgF 2 or BiOCl, said process comprising the following steps: a flake-form inorganic substrate is suspended in water, a water-soluble inorganic metal compound is added, and a pH at which a corresponding metal oxide hydrate, MgF a water-soluble inorganic titanium compound and a water-soluble inorganic iron compound in a molar ratio of 1:0.05 to 1:1, based on the oxides TiO the resultant coated substrate is separated off, optionally washed and dried, and thermally treated at temperatures in the range from 500° C. to 1200° C. under reducing conditions.