Clariant Corporation

Clariant Produkte (deutschland) Gmbh

Hoechst Aktiengescellschaft

Gerhard Wilker

Joachim Weber

Erwin Dietz

Manfred Urban

Martin B&ouml;hmer

Hans-Tobias Macholdt

Klaus Brychcy

Frank Alfter

A pigment composition containing one or more, organic yellow pigments selected from the group C.I. Pigment Yellow (213), Pigment Yellow (214) and disazo pigment of the formula (I) and containing one or more inorganic pigments.

Pigment compositions consisting of organic and inorganic pigments

A pigment composition containing a disazo pigment of formula (I) and at least one pigment from the group of organic orange, red and violet pigments 

Pigment compositions consisting of a yellow disazo pigment and an organic pigment

The invention relates to pigment dispersants of the formula (I), and to pigment preparations including at least one organic pigment and at least one pigment disperant of the formula (I):wherein Q, R, R, E, G, s and n are defined in the specification.

Acid pigment dispersants and pigment preparations

Process for preparing perylene-3,4,9,10-tetracarboxylic diimide in transparent pigment form

A process for the preparation of 4,10-dibromoanthanthrone pigment, which comprises first subjecting the crude 4,10-dibromoanthanthrone pigment, which is in the coarsely crystalline state, to wet milling in an aqueous medium in a stirred ball mill which is operated at a power density of more than 2.5 kW per liter of milling space and at a peripheral stirrer speed of more than 12 m/s under the action of grinding media with a diameter of less than 1.0 mm, until the desired degree of fine division is reached (millbase suspension), and then isolating the resulting pigment in a conventional manner; or subjecting the prepigment obtained in the wet milling to a treatment at elevated temperature (finish) in an aqueous medium, an aqueous-organic medium or a liquid aromatic compound, and then isolating the pigment.

Process for the preparation of 4,10-dibromoanthanthrone pigment

Growing community of inventors

Moerfelden-Walldorf, Germany

Gerhard Wilker