Basf Aktiengesellschaft

Basf Se Corporation

Basf Corporation

Christoph Schwidetzky

Norbert Mronga

Raimund Schmid

Werner Ostertag

Aron Wosylus

Henning Wienand

Ekkehard Schwab

Paul Klingelhoefer

Helmut Knittel

Harald Ochmann

Juergen Walker

Gabe Uzunian

Michael Nebel

The use of an effect pigment (a) comprising an aluminum-based substrate and an iron oxide coating having a red 1order interference color in combination with a colored absorption pigment (b) for producing a coating having enhanced coloristic properties, in particular enhanced chroma, lightness and hiding power, is provided. The pigment combination of (a) and (b) is suitable for coloring plastics, a fiber, a film and a coating composition such as a paint, a printing ink, a varnish or a powder coating, preferably an automotive, an architectural or an industrial coating composition.

Use of iron oxide coated aluminum flakes having red 1order interference color in coatings

An iron oxide containing effect pigment, and methods for producing and using the same are discussed. The iron oxide containing effect pigment may include an iron oxide coating in direct contact with a particulate substrate, which may have high levels of hematite, magnetite, or maghemite; and low amounts of toxic metals. A method for producing the pigment may include chemical vapor deposition of iron pentacarbonyl onto a particulate substrate. The iron oxide containing effect pigments may be incorporated into compositions, such as cosmetics.

Iron oxide containing effect pigments, their manufacture and their use

A process for preparing transparent yellow iron oxide pigments by the precipitation of iron (II) hydroxide by adding an inorganic base to an iron (II) salt solution and subsequent oxidation to FeOOH.

Preparation of transparent yellow iron oxide pigments

Luster pigments comprise coated plateletlike substrates wherein the coating comprises a layer comprising bismuth vanadate.

Luster pigments containing bismuth vanadate

Iron oxides in the form of platelets are produced by hydrothermal treatment of aqueous suspensions containing iron(III) hydroxide or oxide hydrates in the presence of alkali metal hydroxides and of aluminum and/or silicon compounds in two stages. The normality of the alkali is from 0 2 to 2 N in the first stage and is increased by from 0.2 to 2.5 in the second stage. The two-stage process according to the invention makes it possible to produce hematite pigments which are in the form of platelets, have increased luster, larger particle diameter, improved dispersibility and color hues which can be adjusted as desired.

Production of hematite pigments in the form of platelets

Thermostable bismuth vanadate/molybdate pigments are prepared by precipitating onto a pigment, obtained by calcination, of the formula

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Hassloch, Germany

Christoph Schwidetzky