Kronos International, Inc.

Volker Jürgens

Volker Schmitt

Lydia Drews-Nicolai

Siegfried Bluemel

Frank Mersch

Siegfried Blümel

Alexander Breyder

Siegfried Blumel

Janine Siekman

Jörg Friedrich

Hans-Ulrich Schwanitz

Achim Abdin

Siegfried Wensing

The invention relates to a titanium dioxide particle with high opacity and UV-greying resistance comprising two silica coats and at least one alumina coat, to a method for the obtaining the same, and to the use of said particle in a method for obtaining a decorative paper laminate or a d&#xe9;cor foil. The present invention further pertains a decorative paper laminate or a d&#xe9;cor foil containing said coated titanium dioxide particle.

Laminate pigment with spacing properties and high UV-greying stability

The invention relates to a method for the surface treatment of a titanium dioxide with aluminum phosphate and hydrous aluminum oxide that leads to pigments with improved greying resistance, while simultaneously maintaining good brightness and opacity. The method is characterized in that phosphoric acid is initially added to a TiOsuspension with a pH value of at least 8, in which context the pH value drops to 3 or below. An alkaline aluminum compound is subsequently added, in which context the pH rises to at least 5, after which an acid aluminum compound is added, as a result of which a pH value of 4.5 to 7 is obtained. The pigment manufactured by the method according to the invention is eminently suitable for use in decorative laminating paper.

Method for surface treatment of a titanium dioxide pigment

The invention relates to a rutile titanium dioxide pigment for use in decorative laminating papers that yields higher opacity of the papers compared to the prior art, as well as a method for its manufacture. The pigment displays a surface coating that contains aluminum phosphate, aluminum oxide, silicon oxide and titanium oxide. The silicon oxide is precipitated in fluffy form. The coated particles display a BET value of at least 15 m/g. The manufacturing method is characterized in that an aluminum and a phosphorus component are first added to a TiOsuspension. Thereafter, an alkaline silicon component, an acid-reacting titanium component and, optionally, a further pH-regulating component are added, the pH value being set in the range from 4 to 9 in this context.

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The invention relates to a jet mill of modular design for the comminution of powdery materials. An inner pulverizing casing made entirely of wear-resistant material is freely mounted in an outer casing pressure vessel.

Jet mill

The invention relates to a method for the surface treatment of a titanium dioxide that leads to pigments with improved retention and improved opacity, where consistently high opacity can be obtained using less pigment. The method is characterised in that an aluminium component and a phosphorus component are first added to a TiOsuspension, during which process its pH value does not drop below 10. The pH value of the suspension is subsequently lowered to below 9 by adding an acid component. The pigment produced by the method according to the invention is eminently suited to use in decorative laminating paper.

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Kirchhundem, Germany

Volker Jürgens