Bayer Aktiengesellschaft

Hans-Heinrich Moretto

Hans-Dieter Block

Rainer Weber

Heinrich Alberts

Helmut Steinberger

Hans Sattlegger

Armand De Montigny

Klaus Pohmer

Hans Friemann

Peter Schmidt

Wolfgang Ohlendorf

Ulrich Finke

Ottfried Schlak

Christoph Holzner

Michael Batz

Hans Rinkes

Andreas Bulan

Hans-Walter Illger

Bruno Degen

Gebhard Wagner

Norbert Lonhoff

Rainer Bellinghausen

Bernhard Spreckelmeyer

Wilfried Kniege

Uwe Arndt

Joachim Maas

Heinrich Helker

Werner Ludovici

Peter Schober

Uwe Brekau

Ingrid Larking

Alberto C Gonzalez-Doerner

Karlheinz Stachulla

Jan Mazanek

Helmut Vorbruggen

Lothar Puppe

Josef Witte

Karl-Heinz Sockel

Manfred Schonfelder

John Mitchell Huggins

Christian Wegner

Hans Niederprum

Reinhard Schliebs

Gerhard Langstein

Wilhelm Weber

Reiner Voigt

Roland Kleinstuck

Wilfried Kortmann

Fritz Mietzsch

Werner Clarenz

Wolfgang Wieder

Bernd Peltzer

Andreas Nickel

Josef Pfeiffer

Dietrich Pantke

Karl Brandle

Gunther Maass

Elke Licht

Manfred Schulze

Karl-Heinz Kasler

Hans Joachim Lucking

Hans Toepsch

Manfred Borgardt

Karl-Friedrich Thom

Jurgen Ackermann

Werner Michel

Gerhard Jonas

Hans-Georg Nieder-Vahrenholz

Rudolf Mundil

Cornelia Dorzbach-Lange

Ralf Kr Uger

Bernard Munchenbach

Alfred B Orsting

Zbigniew Muziol

Hartmut Schlecker

Werner Rauer

Cornelia Dorzhach-Lange

Willi Burgmer

Reinhard Haida

Wolfgang Schneider

Alfred Wagner

Manfred Wienand

Cornelia Do/ rzbach-Lange

Paul Strehlow

Hans-G Unter Fr Ohlen

A process is provided for the preparation of aqueous silica sols having a particle size of 27 to 72 nm. by adding fresh acidic silica sol into the reactors of a multi stage cascade reactor wherein the reactors contain aqueous solution of colloidal silica sol of a pH of 8 or above. Each successive stage of the cascade reactor is supplied with overflow from the preceding stage. Alkaline compounds, such as alkaline sodium silicate solution, alkaline potassium silicate solution, sodium hydroxide solution or potassium hydroxide solution, are introduced into the first reactor or first reactors so that a pH value in the range of 8 to 12.5 is established in the reactors.

Continuous preparation of silica sols which contain large particles

Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.

Extraction of acids and metal salts from aqueous solutions with diethyl

A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.

Method for manufacturing alkali chromates from chromium ore

This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.

Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali

Fine particle silicon containing surface-bound halogen, a process for

A process for the recovery by distillation of tributyl phosphate (TBPO) from spent hydraulic oils, which are employed particularly in aircraft used for civilian air traffic.

Process for the recovery of tributyl phosphate from spent hydraulic oils

Novel mixtures containing at least one polysiloxane and at least one reactive filler, at least one pigment and/or unreactive filler and optionally other additives, their preparation and use in coating. Preferably they are largely free of organic polymers.

Method for the preparation and use of new mixtures for coatings

In the preparation of dimethylamine-borane by reacting an alkali metal or alkaline earth metal borohydride with a dimethylammonium salt, the improvement which comprises effecting the reaction in a liquid mixture comprising dimethylamine as a solvent and an additional organic solvent.

Method of preparing dimethylamine-borane

Combinations of polyorganosiloxanes and fluororubbers containing double

A process for improving the storage life of a one-component silicone paste containing an alkali metal phosphate and which cures with elimination of acetic acid on exposure to atmospheric moisture, which comprises adding to such paste an acidic additive bearing the functional group --SO.sub.3 H or hydrogen chloride in a concentration sufficient to convene the alkali metal phosphate into the alkali metal salt of the acidic additive.

Stabilization of acetate systems

A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.

Fluoroalkyl- and fluoroaryl-group-containing imides and their salts of general formula (I) ##STR1## wherein R.sub.F is a fluoroalkyl group with 1 to 18 carbon atoms, a fluoroaryl group with 6 to 12 carbon atoms or a mixed fluoroalkylaryl group with 7 to 18 carbon atoms, wherein the carbon chain can also be interrupted by oxygen atoms,

Imides and their salts, as well as their use

A process for the removal of organic impurities and dissolved salts from hydrazine hydrate and aqueous solutions thereof by distillation of the hydrazine hydrate under reduced pressure, passing the hydrazine hydrate vapor through an adsorbent, and condensing the vapor.

Process for the removal of impurities from hydrazine hydrate

Process for the production and concentration of alkaline silica sols containing nonaggregated, spherical SiO.sub.2 particles with a diameter of .gtoreq.1 nm starting with SiO.sub.2 concentrations of 4-8% by weight, using microporous membrane filters.

Process for the production and concentration of silica sols

The present invention relates to fluorinated carboxylic acid esters of phosphono- and phosphinocarboxylic acids containing hydroxyl and/or mercapto groups, their use as waterproofing and/or oil-repellency agents, and a method for their preparation.

Fluorinated carboxylic acid esters of phosphono- and phosphinocarboxylic

Growing community of inventors

Cologne, Germany

Hans-Heinrich Moretto