Bayer Aktiengesellschaft

Kemira Oyj

Akzo Nobel Chemicals International B.v.

Lanxess Deutschland Gmbh

Gerd-Friedrich Renner

Martin Kugler

Lothar Puppe

Helmut Reiff

Hermann Uhr

Karlheinrich Meisel

Bernd Thiele

Thomas Jaetsch

Klaus Walz

Rainer Bruns

Johan Kijlstra

Arno Nennemann

Rolf Matysiak

Peter Wild

Karl-Rudolf Gassen

Rainhard Koch

Otto Exner

Karin Hassenruck

Heinz-Joachim Rother

Hans Schulze

Hanns-Peter M&uuml;ller

Gisela Greif

Thomas Hübbe

Peter Spetmann

Karl H Pisaric

Lars Obendorf

J&uuml;rgen Reiners

Andreas Böttcher

Reiner Ditzer

Dietmar Fuchs

Armin Spaniol

Lothar Klein

Harro Tr&auml;ubel

Thomas Hubbe

Carsten Gerdes

Thomas Huebbe

Branislav Boehmer

Robrecht Froyman

Dietmar Schlegel

Claudio Ortiz

Andreas Bottcher

Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.

Paper production with modified silica gels as microparticles

A process for the preparation of polymeric condensates, wherein the reaction mixture is fed at least once during the condensation reaction through a zone of high energy density which has an energy density of at least 10J/m.

Process for the preparation of polymeric condensates and their use

Biologically degradable leather

.beta.-Hydroxyalkylpicolinium salts of the formula (I) ##STR1## wherein A, R.sup.1 to R.sup.3 and X have the meanings given in the description, which are obtained by reaction of picolines of the formula (II) ##STR2## with alkylene oxides of the formula (III) in the presence of a 1- to 3-basic acid and in water or an organic solvent as the reaction medium and are used as intermediate products for the preparation of cationic dyestuffs, and dyestuff preparations comprising such cationic dyestuffs.

Process for the preparation of beta-hydroxyalkypicolinium salts

Novel dyestuffs of the formula (I) ##STR1## in which DK denotes a radical of the formula ##STR2## where m is 1 or 2 and DK' denotes a radical of the formula ##STR3## where n is 1 or 2 R.sub.1 represents hydrogen or substituted or unsubstituted C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkyl,

Triazinyl-amino bridge-containing disazo dyestuffs

Growing community of inventors

Kürten, Germany

Gerd-Friedrich Renner