Composite particles of the present invention include alumina particles and an inorganic coating disposed on a surface of the alumina particles, the alumina particles containing molybdenum (Mo), the inorganic coating including a composite metal oxide.

The present invention relates to a method for producing metal effect pigments based on aluminum platelets which are provided with a metal oxide coating, said method comprising the following steps: (a) providing the aluminum platelets in an organic solvent so as to form a corresponding dispersion and adding at least one metal oxide precursor compound while the metal oxide precursor compound is dissolved, and b) decomposing the metal oxide precursor compound in the organic solvent so as to form the metal oxide coating on the aluminum platelets. The present invention further relates to metal effect pigments that can be obtained by the method according to the invention as well as to the use of the metal effect pigments according to the invention.

The present invention is directed to a coated bismuth oxy halide-based pigment having a coating comprising an anti-oxidant, said antioxidant is being a phenol based, a phosphite or phosphonate based, or a thioether based stabilizer, and the coating comprising an inner coating and an outer coating, wherein the outer coating comprises the antioxidant, and wherein the inner coating comprises a first layer consisting of one or more salts, or one or more oxides, heteropolyacids, organic acids, sulphites, sulfides, sulfates, phosphates, pyrophosphates, polyphosphates, hydrates, carbonates, or a combination thereof, selected from the group of alkali-earth metals, metals, non-metals, transition metals or lanthanides. Further, the present invention is directed to a composition comprising a paint, a lacquer, an ink, a cosmetic, a resin, a plastisol or a polymer formulation, and such pigment. In addition, the present invention is directed to a method for manufacturing a coated bismuth oxy halide-based pigment, said method comprising the steps of:providing a dispersion of a bismuth oxy halide-based pigment,adding a dispersion of an antioxidant,mixing and drying.

A colored metallic pigment according to the present invention is a colored metallic pigment including at least a metallic pigment, an amorphous silicon oxide film layer formed on a surface of the metallic pigment, a metallic-particle-supporting layer formed on a surface of the amorphous silicon oxide film layer, and metallic particles formed on a surface of the metallic-particle-supporting layer, characterized in that the metallic-particle-supporting layer is formed of one or both of a metal layer and a metal oxide layer composed of a metal oxide other than silicon oxide, the metallic particles are formed to directly cover a part of the surface of the metallic-particle-supporting layer, and the amorphous silicon oxide film layer has a thickness of more than 500 nm.

Disclosed are pigment powders containing only coated BiOCl flakes, which flakes area) BiOCl flakes having a coating containing yellow iron oxide Fe.sub.2O.sub.3*xH.sub.2O, optionally a colorant, optionally an adjuvant, and optionally SiO.sub.2, b) BiOCl flakes having a coating containing SiO.sub.2, optionally a colorant, and optionally an adjuvant, c) BiOCl flakes having a coating containing a colorant, SiO.sub.2, optionally yellow iron oxide Fe.sub.2O.sub.3*xH.sub.2O, and optionally an adjuvant, or d) BiOCl flakes having a coating containing Fe.sub.3O.sub.4 and optionally SiO.sub.2, to a process for the preparation of the pigment powders, and to the use thereof especially in cosmetic formulations.

The invention relates to coated effect pigments, wherein the coating comprises a binder which is suitable for powder paints. They comprise a crystalline and an amorphous fraction which is determined by C.sup.13 NMR MAS relaxation measurements, the relaxation of the .sup.13C cores being fitted as a biexponential relaxation according to the formula (II) and the degree of crystallinity c being in a range between 40 to 85%, and relaxation having a short average relaxation time T.sub.1.sup.s and a long average relaxation time T.sub.1.sup.l, and T.sub.1.sup.l being in a range of from 65 to 130 s. The effect pigments coated according to the invention have at least one endothermic peak with a maximum from a range of T.sub.max=100 to 150 C. and an enthalpy H associated with said peak from a range of 15 J/g to 80 J/g in DSC at a feed speed of 5 C./min, the enthalpy being calculated relative to the amount of the binder. The binders are applied to the effect pigment by way of spontaneous precipitation.