Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gmbh

Herberts Gmbh

Klaus Ambrosius

Klaus-Dieter Franz

Reiner Esselborn

Sabine Schoen

Ralf Anselmann

Klaus D Franz

Marcus Mathias

Matthias Schraml-Marth

Manfred Parusel

Gerhard Pfaff

Manfred Kieser

Ralf Petry

Reinhold Rueger

Christoph Schmidt

Katsuhisa Nitta

Wolfgang Hechler

Helge Bettina Kniess

Johann Dietz

Stephanie Andes

Stefan Wilhelm

Ralf Emmert

Margarete Herbski

Claudia Seibel

Axel Rau

Matthias Schilling

Manfred Letsch

Hans-Joachim Graetz

Reinhold Rüger

Helmut Plamper

August Knapp

Michael Roesler

Andreas Wächtler

Ralf Schäfer

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 present invention relates to interference pigments based on coated flake-form substrates which are distinguished by the fact in that they comprise

Interference pigments

The present invention relates to multilayer pigments based on glass flakes and to a method for the production of such pigments. The resulting pigment can be used in any application for which pearlescent pigments have been heretofore used such as, for example, in plastics, paints, inks, cosmetic formulations, coatings including solvent or waterborne automotive paint systems, powder coatings, inks and agriculture foils, for the laser-marking of papers and plastics.

Multilayer pigments based on glass flakes

The present invention relates to effect pigments based on thin glass flakes and to a method for the production of such pigments. The resulting pigment can be used in any application for which pearlescent pigments have been heretofore used such as, for example, in plastics, paints, inks, cosmetic formulations, coatings including solvent or waterborne automotive paint systems, powder coatings, inks and agriculture foils.

Effect pigments based on coated glass flakes

Multilayered interference pigments

The present invention relates to non-lustrous iron oxide-containing color pigments based on dry-milled inorganic plateletlike substrates having a particle size of &lt;60 .mu.m, characterized in that the iron oxide compound is yellow FeO(OH) and/or Fe.sub.2 O.sub.3.

Non-lustrous pigments

The present invention relates to color pigments based on substrates which are coated with a doped layer of iron(III) oxide, to processes for their preparation and to their use, especially in aqueous coating systems.

Color pigments

Platelet-like colored pigments and process for producing the same

The invention relates to the preparation of single-multi-component metal oxide sols by hydrolysis of an aqueous metal salt solution or a solution of a metal salt mixture by direct electrolysis at -20.degree. to 50.degree. C.

Preparation of metal oxide sols by electrolysis

Pearl luster pigments based on mica flakes coated with metal oxides are provided with a top coating of tin dioxide and/or cerium dioxide to improve their stability in glazes and enamels.

Pearl luster pigments stable to glaze and enamel

In mica/titanium dioxide pigments reliable rutilization is obtained with small amounts of tin by precipitating tin dioxide directly on the mica and completing this precipitation before the precipitation of titanium dioxide is started.

Process for preparing rutile-coated mica pigments

The application relates to a pearlescent pigments based on platelet-like substrates, such as mica, which are coated with metal oxides, the metal oxide layer containing titanium and also iron, wherein the pigment has a multi-layer structure in which a first layer of TiO.sub.2 in the rutile form is followed by a layer of pseudobrookite and an iron oxide layer.

Iron oxide coated perlescent pigments

Base lacquers suitable for use in multi-layer lacquerings containing a layer of base lacquer and a layer of clear lacquer on top of this, contain a nacreous pigment based on mica flakes coated with metal oxides, wherein the nacreous pigments have a particle size substantially in the range between 5 and 25 .mu.m. The resultant lacquerings have advantageous properties.

Lacquering process using nacreous pigments

Nacreous pigments which have improved stability to weathering and are based on mica flakes coated with metal oxides, are provided with a stabilizing, chromium-containing second coating which comprises a combination of metal salts. To form the second layer, iron and/or manganese are deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate and chromium is deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate or as methacrylato-chromium chloride. These are prepared by adding iron and/or manganese and chromium, in the form of salt solutions and at a pH of 2 to 8, to an aqueous suspension of a mica flake pigment coated with metal oxides, precipitating them on the mica flake pigments, and separating off these pigments and drying them.

Nacreous pigments

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Dieburg, Germany

Klaus Ambrosius