Clariant Corporation

Hoechst Aktiengesellschaft

Hoecht Aktienge Sellschaft

Dieter Baumgart

Wolfgang Bauer

Walter Zoller

Klaus-Peter Kreutzer

Hans-Tobias Macholdt

Dieter Schnaitmann

Rudiger Baur

The use of an azo pigment of the formula (1) ##STR1## as a colorant in electrophotographic toners, electrophotographic developers, powders and powder coatings, and electret materials, wherein said azo pigment is prepared in the presence of 20 to 50% by weight of an auxiliary selected from the group consisting of a rosin, a salt of a rosin, an abietic acid, and a salt of an abietic acid, wherein said weight is based on the overall weight of the azo pigment including said auxiliary, and wherein the azo pigment has a specific surface area of more than 70 m.sup.2 /g and the azo pigment particles comprising the azo pigment have a length-to-width ratio of on average less than 2.8:1 and a mean particle size d.sub.50 of less than 130 nm.

Electrophotographic, resin-containing, electret, or inkjet compositions

Water-soluble perylene dyestuffs, their preparation and their use The present Application relates to water-soluble perylene dyestuffs of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another are the radicals A--X--COOM or A--X--SO.sub.3 M;

Water-soluble perylene dyestuffs, their preparation and their use

The present application relates to water-soluble copper phthalocyanine dyestuffs of the formula I ##STR1## in which CuPc is a copper phthalocyanine radical;

Water-soluble copper phthalocyanine dyestuffs, their preparation and

The present invention relates to benzothioxanthene dyes of the formula I, ##STR1## in which R.sup.1 is SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5, R.sup.2 and R.sup.3 independently of one another are hydrogen, SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5 and X, Y, n, R.sup.4, R.sup.5 and M.sup..sym. are as defined in claim 1, to their preparation and to their use, especially in inks and recording liquids.

Benzothioxanthene dyes, their preparation and their use

The present invention relates to tetrakisazo dyes of the general formula I ##STR1## in which ##STR2## and R.sup.1, R.sup.2, R.sup.3, M.sup..sym.1 to M.sup..sym.1 and n are as defined in Claim 1, to processes for their preparation and to their use.

Tetrakisazo Compounds, the method of preparation thereof and the process

The present invention relates to water-soluble polyazo dyestuffs of the general formula I ##STR1## wherein Y, Z, m and M.sup..sym.1 to M.sup..sym.4 are as defined in claim 1, processes for dyeing leather and paper with the polyazo dyestuffs, and recording liquids and inks containing the polyazo dyestuffs.

Growing community of inventors

Egelsbach, Germany

Dieter Baumgart