Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschraenkter Haftung

Merck Patent Gesellschaft MIT Beschr&auml;nkter Haftung

Klaus Bernhardt

Gerhard Pfaff

Christoph Schmidt

Helge Bettina Kniess

Constanze Prengel

Sabine Schoen

Reiner Vogt

Dieter Heinz

Manfred Kieser

Karl Osterried

Klaus-Dieter Franz

Hartmut Hartner

Gerhard Edler

Wolf-Dietrich Weber

Hans-Dieter Br&uuml;ckner

Axel Von Daacke

The present invention relates to an intrinsically markable laser pigment in the form of a reducible metal compound in the form of a preparation, and to the use thereof in inorganic systems and in organic polymers, in particular plastics, surface coatings, automobile paints, powder coatings, printing inks, paper coatings and papermaking stocks.

Pigment for laser marking

The present invention relates to semitransparent interference pigments having a neutral mass tone comprising a substrate and a coating comprising metallic tin and additionally at least one metal oxide, to a process for the preparation of these pigments, and to the use thereof.

Semi-transparent interference pigments containing tin

The invention relates to an interference pigment with a high covering power, comprising at least one FeTiO-containing layer, which is applied to a lamellar inorganic substrate and whose thickness and absorbing power can be precisely set. The invention also relates to a method for producing this interference pigment and to the use thereof.

Interference pigment with a high covering power

The invention relates to intensely colored interference pigments based on multi-layered plate-like substrates with at least two sequences of layers consisting of (A) a colorless layer with a refraction index n&lE;1,8; (B) a high-index layer consisting of a mixture of TiO and Fe O in a ratio of 1:0.1 to 1:5 and optionally, one or more metal oxides in quantities of to layer (B); and optionally (C) an outer protective layer.

Intensely colored interference pigments

The invention relates to interference pigments with a great color strength that are based on multicoated platelet-shaped substrates that have at least one series of layers from (A) a highly refractive coating that consists of a mixture of TiO and Fe O in ratio of 1:0.1 to 1:5 and optionally one or more metal oxides in amounts of &lE;20% by weight based on layer (A), (B) a colorless coating with a refractive index n&lE;1.8, (C) a colorless coating with a refractive index of n 1.8, (D) an absorptive coating with a refractive index of n 1.8, and optionally (E) an outer protective layer.

Interference pigments with great color strength

Interference pigments

A colored interference pigment having a platelet-shaped layer as substrate, a coating of at least one metal oxide layer and, optionally, a further layer, at least two layers comprising or consisting of colorants.

Colored interference pigment

The invention relates to carbon-containing pigments having improved abrasion resistance and dispersibility and to their production.

Carbon-containing figments

The invention relates to conductive flaky pigments for which a flaky substrate has been coated with an electrically conductive layer, characterized in that the conductive layer comprises a metal oxide pigment layer which is interspersed with carbon black particles and which has at the same time been doped with additional metal oxide particles.

Conductive flaky pigments

The invention is interference pigments having improved covering power and high luster based on platelet-shaped substrates which, if desired, are coated with one or more films comprising one or more metal oxides and are obtainable by adding an aqueous carbon black dispersion and a solution of one or more metal salts to an aqueous suspension of the substrate at a pH suitable for hydrolysis of a film comprising the metal oxide(s) or hydroxide(s) and containing carbon black, in which the product obtained, after being separated off and, if desired, after washing and drying, is ignited at 700.degree.-900.degree. C. in an oxygen-containing atmosphere, during which carbon oxides escape.

The invention relates to a pigment containing carbon black having improved abrasion resistance comprising a platelet-shaped substrate coated with a metal oxide layer containing carbon black, wherein the carbon black is fixed on the substrate by means of an anionic or cationic and a nonionic surfactant and an organosilane compound.

Pigments containing carbon black

Materials coated with plate-like pigments and characterized in that the coating shows structuring in defined areas due to a difference in the orientation of the pigment particles are highly suitable in the area of general security printing.

Growing community of inventors

Gross-Umstadt, Germany

Klaus Bernhardt