Basf Aktiengesellschaft

Juan A Gomez

Norbert Mronga

Raimund Schmid

Werner Ostertag

Helmut Schmidt

Claus Kaliba

Hermann Bidlingmaier

Raymond Ellinghoven

Heinrich Hartmann

Walter Denzinger

Knut Oppenlaender

Harald Keller

Reinhold Rieger

Joachim Jesse

Reinhold Schlegel

Paul Guenthert

Hermann Birkhofer

Benno Sens

Robert Kreuzer

Reinhard U Roth

Luster pigments obtainable by treating titania-coated silicate-based platelets at from 400.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia are useful for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Luster pigments based on reduced titania-coated silicate-based platelets

Preparation of bluish luster pigments by treating titania-coated silicatic platelets with a reducing gas mixture, which comprises treating titania-coated silicatic platelets whose titania coating has a geometric layer thickness of from 10 to 60 nm at from 800.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia, and also bluish luster pigments based on silicatic platelets comprising a reduced titania coating with a geometric layer thickness of from 10 to 60 nm and CIELAB color coordinates -2.ltoreq.a*.ltoreq.2 and b*.ltoreq.-20 (measuring angle 20.degree., standard illuminant D65).

Preparation of bluish luster pigments

Silicon oxide-coated solid particles are produced by decomposing silanes which contain at least one alkanoyloxy radical with water vapor and/or oxygen in the presence of the agitated solid particles.

Production of silicon oxide-coated solid particles

Passivated metallic pigments obtainable by gas-phase decomposition of volatile phosphorus compounds and of volatile nitrogenous silicon compounds with steam and/or oxygen in the presence of the agitated pigment particles, and the production of these pigments and their use for coloring water-based printing inks, other inks and paints.

Doubly gas-phase passivated metallic pigments

A simple process for achieving very active passivation of metal pigments against hydroxyl-containing compounds comprises treating the metal pigments with passivators in the gas phase.

Gas-phase passivation of metal pigments

Use of pigment formulations for the preparation of pastes, printing inks

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Ludwigshafen, Germany

Juan A Gomez