Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Haarmann & Reimer Gmbh

Jurgen Kischkewitz

Kai Butje

Waldemar Czaplik

Hilmar Rieck

Rolf Michael Braun

Udo Holtmann

Hans-Josef Buysch

Ottfried Schlak

Eberhard Zirngiebl

Norbert Schon

Ulrich Meisen

Gunter Lailach

Gunter Linde

Wilfried Burow

Roland Langner

Hans-Joachim Schittenhelm

Holger Friedrich

Andreas Schlegel

Gerhard Wiederhoft

Rolf-Michael Braun

Christoph Tiburtius

Bernd-Michael Holle

Krzysztof Chlopek

Klaus Rohbock

Peter-Joachim Barenthien

Guido Ketteler

Gerald Büchner

Peter Bailly

Michael Miksits

Peter Beumer

Albrecht Warth

Franz Herzig

Stephan Spiegelhauer

Lutz Kohnert

Holger Inden

Wolfgang Oehlert

Alfred Bardoun

Birgit Blankenmeyer-Menge

Peter Kohler

Huajun Li

The present invention relates to iron oxide red pigments having improved color values, a process for producing these improved iron oxide red pigments by the Penniman red process using nitrate (also referred to as nitrate process or direct red process) and an apparatus for the production thereof.

Red iron-oxide pigments with improved colour values

The present invention relates to an improved process for producing iron oxide red pigments by the Penniman process using nitrate (also referred to as nitrate process or direct red process).

Preparation of iron (III) oxide pigment

The present invention concerns agents containing at least one inorganic pigment, one or more oils, and one or more waxes, and also processes for production thereof and their use for coloration of building products, preferably asphalt, bitumen, bituminous mixtures, tar and tar-containing compositions, and also a process for coloration of building products and the building products colored with the agents.

Oil- and wax-containing compositions in piece form for the coloring of asphalt and bitumen

The present invention relates to a black pigment/auxiliary combination having an improved relative color strength of greater than or equal to 110%, the preparation thereof and the use thereof.

Black pigment/auxiliary combination having improved colour strength

The invention relates to a process for re-processing deactivated DENOX catalysts on the basis of Ti/V/Mo/W mixed oxides.

Process for producing mixed oxide powders from deactivated denox

This invention relates to a process for the production of inorganically coated pigments and fillers and to the use thereof.

Process for the production of inorganically coated pigments and fillers

A process for the production of a mixed oxide powder, that contains as chief constituent TiO.sub.2 in the form of anatase and as minor constituents at least one of the catalytically active oxides MoO.sub.3, WO.sub.3 and V.sub.2 O.sub.5, suitable for use as a catalyst for the removal of nitrogen oxides, comprising

Process for the production of mixed oxide powders for catalysts for the

The invention relates to finely divided, highly pure neutral zinc oxide powder used for UV protection in cosmetic sun screen preparations and daytime skin care preparations as well as in lacquers and plastics, and to a process for its preparation.

Finely divided, highly pure neutral zinc oxide powder, a process for its

A process for the preparation of very pure titanium dioxide by reacting titanium tetrahalides with sulphuric acid, hydrolysis the titanyl sulphate solution obtained and calcining the hydrolysate is disclosed wherein the reaction between titanium tetrahalide and aqueous 20-40% by weight strength sulphuric acid is performed in such a way that crystallisation of titanyl sulphate does not take place, the hydrogen halide is separated, the solution is optionally concentrated and filtered and then the ratio by weight of sulphuric acid to titanium dioxide is adjusted to between 1.7 and 2.0 and the titanium dioxide concentration is adjusted to between 250 and 300 g/l, the solution is hydrolyzed and the resulting titanium oxide hydrate is filtered off and calcined to give Futile or anatase.

Process for the preparation of very pure titanium dioxide

Carbonic diesters containing at least one aromatic ester group can be prepared from carbonic diesters containing at least one aliphatic ester group by transesterification using a phenol, titanium dioxide having a surface area of at least 20 m.sup.2 /g as determined by the BET method being used as catalyst.

Process for the preparation of aromatic carbonic diesters

A process for calcining a filter cake in a directly heated rotary kiln wherein part of the filter cake is separated from the entire mass of filter cake, the separated portion is predried and recombined with the remainder portion and the combined predried and remainder portion is calcined. The filter cake can be inorganic solids such as oxides of titanium, chromium (III), zinc and iron.

Process for the calcination of filter cakes with high solids contents

An inorganic pigment comprising a content of at least 0.1% by weight and at most 5% by weight of one or more polyorganosiloxanes, wherein the polyorganosiloxanes have viscosities of 10 to 100,000 mPa.s and a relative molecular weight of 500 to 500,000, have no reactive or crosslinking groups, contain at least one C.sub.9 -C.sub.25 Si-alkyl and/or one C.sub.9 -C.sub.25 Si-aryl group per molecule, the total content of these groups in the polyorganosiloxane being 7-70% by weight and the other organic radicals contained in the polyorganosiloxane having 1 to 8 carbon atoms. Such pigments can be used in lacquers, emulsion paints, plastics, toners, magnetic recording materials, building materials and enamels.

Storage-stable inorganic pigments containing specific

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Ratingen, Germany

Jurgen Kischkewitz