Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschrankter Haftung

Stephanie Andes

Gerhard Pfaff

Sabine Schoen

Matthias Kuntz

Ulrich Schoenefeld

Gerald Fuchs-Pohl

Dieter Br&uuml;ckner

Reiner Vogt

Karl Osterried

Michael Schmelz

Gerd Bauer

Andrea Heyland

Michael Jungnitz

Kirsten Fritsche

G&uuml;nter Brenner

Carsten Plueg

Michael Uhlig

Stefan Schlueter

Martin Friz

Ralf Petry

Katsuhisa Nitta

Johann Dietz

Helge Bettina Kniess

Klaus Ambrosius

Peter Reynders

Margarete Herbski

Elke Steudel

Sabine George

Gerhrad Pfaff

Siegfried Raabe

Ralf Schweinfurth

Martina Welsch

Thomas Krasemann

Manfred Thon

Melanie Mechthild Breidung

Michael Roesler

Nitta Katsuhisa

The present invention relates to effect pigments which are based on flake-form substrates having a circular form factor of 1.2-2 and are coated with at least one high-refractive-index layer, and to the use thereof, inter alia in paints, coatings, printing inks, plastics and in cosmetic formulations.

Effect pigments

The invention relates to interference pigments based on SiOflakes having a broad layer-thickness distribution, and to the use thereof in paints, coatings, powder coatings, plastics and in particular in cosmetic formulations and for colouring food and pharmaceutical products.

Interference pigments

Effect pigments based on AlOflakes with high weather resistance and less photoactivity and to their use thereof in paints, industrial coatings, automotive coatings, printing inks, cosmetic formulations. The effect pigments have a ratio of the amount by weight of AlOof the AlOflake and the amount by weight of the metal oxide(s) of the coating layer(s) in the range of from 27:73 to 83:17 based on the total weight of the effect pigment.

The invention relates to multilayered luster pigments based on metallic substrates, which are completely surrounded by a plurality of layers, where these layers comprise at least one layer pack (A) having a colorless dielectric layer of a material with a refractive index n of &#x2266;1.8, and a colorless dielectric layer of a material with a refractive index n of &#x3e;1.8, and a selectively or non-selectively absorbent layer (B), and to a process for their production, and to their use.

Multilayered luster pigments

The invention relates to a pigment with a metallic luster, comprising a plate-like non-metallic substrate having a thickness lower an 200 nm, which is entirely coated with a metallic layer.

Pigment with a metallic luster

A pigment with a metallic luster, comprising a wafer-like substrate made of aluminium dioxide having a thickness of more than 250 nm and less than 1 &#x3bc;m, which is fully enveloped by a metal layer.

The present invention relates to multilayer pigments based on platelet-shaped metal substrates coated with two or more metal oxide layers by a one-pot process in an exclusively aqueous medium. The invention further relates to the use of the multilayer pigments in paints, varnishes, printing inks, including security printing inks, plastics, ceramic materials and cosmetic and for the laser formulations marking of plastics.

Multilayer pigments based on coated metal platelets

Multilayer pearl lustre pigment

Multilayer nacreous pigment

Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Multi-coated interference pigments

Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Multilayer interference pigments

Multilayer pearl luster pigment based on an absorbing platelet-shaped substrate which is coated with alternating layers of a material of low refractive index and a material of high refractive index, or with a metal, the difference in the refractive indices being at least 0.1.

Multilayer pearl luster pigment based on an opaque substrate

Colored pearl luster pigment consisting of a core of platelet shaped titanium dioxide and one or more layers of other metal oxides or metal oxide hydrates obtainable by solidifying an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with one or more other metal oxides or metal oxide hydrates, for example Fe,O,, Fe,O,, FeOOH or Cr,O,, by a wet method, separating, drying and, if desired, calcining the material obtained.

Metal oxide coated titanium dioxide lamellas

Growing community of inventors

Hanau, Germany

Stephanie Andes