Merck Patent Gesellschaft MIT Beschrankter Haftung

Merck Patent Gmbh

Merck Patent Gesellschaft MIT Beschraenkter Haftung

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Merck Patent Gesellschaft MIT Beschr&auml;nkter Haftung

E. Merck

Manfred Kieser

Otto Stahlecker

Klaus-Dieter Franz

Gerhard Edler

Emil Ferdinand Aust

Reiner Hesse

Juergen Gehlhaus

Alfred Hennemann

Hans-Jürgen Brehm

Hans Pratzer

Gerhard Pfaff

Gerhard Herget

Ralf Glausch

Johann Dietz

Klaus Ambrosius

Reiner Esselborn

Klaus Bernhardt

Hartmut Hartner

Jurgen Gehlhaus

Constanze Prengel

Markus Schum

Robin Hilder

Tony Leon Filip Daponte

Alfred Hennenmann

Axel Von Daacke

Manfred Thon

Wilhelm Gobel

Hans-J&uuml;rgen Solms

Afred Hennemann

Patrick Corneel Mathilde Verschaeren

The present invention relates to opaque plastics comprising effect pigments which are distinguished by the fact that they have high gloss and virtually no visible or no visible flow lines.

Opaque plastics

The invention includes pigment compositions for plastics comprising one or more flake-form effect pigments, a carrier material and one or more fluorine-containing polymers, to a process for the preparation of the pigment compositions, and to the use thereof for pigmenting plastics and for the production of masterbatches.

Pigment composition for plastics

The invention relates to a plastic part having lustrous pigments and filler particles. Moldings of this plastic part exhibit a pronounced glitter effect.

Plastic part comprising lustrous pigments and filler particles

The present invention relates to laser-markable plastics of which a feature is that they include, as absorber material, a mixture of pearl luster pigments and/or non-lustrous metal oxide-coated mica pigments and inorganic platelet-form substrates.

Laser-markable plastics

The present invention is directed to a process for producing a master batch of pigment, comprising mixing a pigment having a high aspect ratio, embedded in a material increasing bulk density of the pigment, with a plastic so as to produce a dispersion of pigment and plastic.

Pigment modification improving handling characteristics

Composite material for the screening of radiation, comprising a polymer, an additive and the customary stabilizers and processing aids necessary for the particular polymer. The additive is preferably an interference pigment.

Agricultural method and materials for screening solar radiation

Formulations

Surface-modified conductive pigment obtainable by partial coating of a conductive pigment with an organic modifying agent. The modifying agent is an organometallic compound of the elements silicon, tin, titanium, zirconium or aluminum. The pigment is prepared by dispersing a conductive pigment, subsequently adding the modifying agent, if appropriate as a mixture with a solvent, to the pigment dispersion, and in particular in an amount such that the powder electrical conductance of the partly coated conductive pigment is in the range between 80% of the starting value and 10 S, removing the solvent present, if appropriate, with further agitation and heating of the pigment to 100&deg; C. and finally drying the partly coated pigment.

Surface-modified conductive pigment

A process for producing powder coating materials comprising lustre pigment comprises starting materials consisting of customary powder coating components and one or more lustre pigments. The starting materials are first introduced into the filling chamber of a first vessel which has a mixing element and is provided, if desired, with a thermostat. Subsequently, a supercritical fluid is admitted to the filling chamber, and finally the starting materials are mixed in the presence of the supercritical fluid. The mixture of the customary powder coating components, one or more lustre pigments and the supercritical fluid is transferred by a distributor into a second vessel. The distributor has a plurality of nozzles with an aperture diameter of from 0.025 cm to 2.5 cm. During transfer, the second vessel is maintained at an internal pressure of from 0 bar to 350 bar and at a temperature of from &minus;85&deg; C. to 200&deg; C.

Method for producing powder lacquer containing gloss pigments

Effect powder coating compositions which contain 0.1-10% by weight of conductive pigments, the process for their preparation and their use.

Effect powder coatings

Pigment preparation

The present invention relates to a method for coating substrate materials with polymers containing lustre pigments, in which a substrate has applied to it a curable coating, followed by a coat of lustre pigments or lustre pigment mixtures and then a clear coat.

Coatings

There is disclosed an electrically conductive pigment containing 20 to 95% by weight of a component A comprising one or more conductive platelet-like pigments and 5 to 80% by weight of a component B comprising one or more conductive needle-shaped or fibrous pigments.

Conductive pigment

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.

Materials coated with plate-like pigments

The invention relates to surface-modified platelet-like pigments based on platelet-like substrates which are coated with a titanium dioxide layer and a thin alkaline earth metal titanate film on top of it, in which the pigment, in order to increase the photostability and to decrease the surface reactivity towards organic compounds, is ignited at temperatures of at least 800.degree. C.

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Darmstadt, Germany

Manfred Kieser