Abstract: The present invention relates to silver-colored effect pigments having a strong sparkle effect based on Al2O3 flakes and to the use thereof in paints, button pastes, automotive paints, automotive refinish paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, paper, for coating seed, in security applications, as dopant for the laser marking of plastics and papers, as additive for the laser welding of plastics, in cosmetic formulations and for the preparation of pigment preparations and dry preparations.

Abstract: The present invention relates to silver-coloured effect pigments having a strong sparkle effect based on Al2O3 flakes and to the use thereof in paints, button pastes, automotive paints, automotive refinish paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, paper, for coating seed, in security applications, as dopant for the laser marking of plastics and papers, as additive for the laser welding of plastics, in cosmetic formulations and for the preparation of pigment preparations and dry preparations.

Abstract: The present invention relates to intensely coloured and light-stable effect pigments based on transparent, undoped SiO2 flakes, which are distinguished by the fact that they are covered with an iron-oxide layer having a thickness of 30-150 nm, and all SiO2 flakes have an identical thickness, and the thickness of the SiO2 flakes is 250-400 nm, and to the use thereof in pigment mixtures, in cosmetic formulations and for colouring foods and pharmaceutical products.

Abstract: The present invention relates to intensely coloured and light-stable effect pigments based on transparent, undoped SiO2 flakes, which are distinguished by the fact that they are covered with an iron-oxide layer having a thickness of 30-150 nm, and all SiO2 flakes have an identical thickness, and the thickness of the SiO2 flakes is 250-400 nm, and to the use thereof in pigment mixtures, in cosmetic formulations and for colouring foods and pharmaceutical products.

Abstract: Effect pigments having improved optical properties based on SiO2 flakes coated with one or more layers, where the SiO2 flakes have a thickness of from 50 nm to 150 nm; processes for the preparation thereof; and use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity cards, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations; are disclosed.

Abstract: The present invention relates to effect pigments having a color flop comprising metal oxide-coated SiO2 flakes having a uniform layer thickness, where the color flop runs through all four quadrants of the a,b color coordinate system (CIELAB L,a,b system). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes having a uniform layer thickness are coated with metal oxides, and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.

Abstract: The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiO2 flakes, where the total thickness of the effect pigments is not greater than 500 nm (+/?30 nm). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes are coated with iron oxide, where the thicknesses of the SiO2 flakes and of the iron-oxide layers are selected in such a way that the total thickness of the red effect pigments is not greater than 500 nm (+/?30 nm), and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.

Abstract: The present invention relates to intensely colored red effect pigments comprising iron oxide-coated SiO2 flakes, where the total thickness of the effect pigments is not greater than 500 nm (+/?30 nm). The present invention likewise relates to processes for the preparation of these pigments in which SiO2 flakes are coated with iron oxide, where the thicknesses of the SiO2 flakes and of the iron-oxide layers are selected in such a way that the total thickness of the red effect pigments is not greater than 500 nm (+/?30 nm), and to the use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity papers, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations.

Abstract: Effect pigments having improved optical properties based on SiO2 flakes coated with one or more layers, where the SiO2 flakes have a thickness of from 50 nm to 150 nm; processes for the preparation thereof; and use of these pigments in cosmetics, paints, coatings, plastics, films, in security printing, in security features in documents and identity cards, for coloring seed, for coloring foods or in medicament coatings and for the preparation of pigment compositions and dry preparations; are disclosed.