Huels Aktiengesellschaft

Degussa-Huels Aktiengesellschaft

Hans-Guenther Srebny

Jaroslaw Monkiewicz

Burkhard Standke

Michael Horn

Hans-Joachim Koetzsch

Claus-Dietrich Seiler

Albert Frings

Frank Kropfgans

Albert-Johannes Frings

Bertram Trautvetter

Peter Jenker

Hartwig Rauleder

Peter Jenkner

Anton Schoengen

Hermann-Josef Korte

Uwe Dittrich

Gerhard Franz

Frank Steding

Christine Fliedner

Thomas Jostmann

Huhn Guenter

Stefan Jelko

Katrin Marschner

An apparatus for the purification of crude N,N&prime;-diphenyl-p-phenylenediamine (DPPD) in which there is an extraction unit containing a liquid permeable container and an adsorption layer downstream of the container, a solvent evaporator downstream of the adsorption layer, a filter unit, a line for returning the filtrate to the solvent evaporator, and a condenser for returning solvent to the extraction unit.

Apparatus for the purification of commercially available diphenyl-p-phenylenediamine (DPPD)

The invention concerns reinforcement additives consisting of oligomeric and/or polymeric sulfur-containing organoorganooxysilanes, perhaps other unsaturated hydrocarbon-containing organoorganooxysilanes and reinforcing semiactive, active, and/or highly active carbon blacks, common in rubber, their production, and the use of the additives in perhaps silicatically filled vulcanizable rubber mixtures and compositions and in plastic mixtures or in carbon black dispersions.

Reinforcement additives

A process for the purification of crude N,N'-diphenyl-p-phenylenediamine (DPPD), which comprises extracting crude DPPD with a hydrocarbon or hydrocarbon mixtures thereby forming an extract solution containing DPPD, passing the extract solution over an adsorption layer, and recovering purified DPPD from the solution.

Process and apparatus for the purification of commercially available

A process for the stabilizing of an organosilane with an effective, stabilizing amount of purified N,N'-diphenyl-p-phenylenediamine (DPPD). The purification of crude DPPD involves extracting crude DPPD with hexane thereby forming an extract solution containing DPPD, passing the extract solution over an adsorption layer comprising silica gel as the adsorbent to form a solution containing purified DPPD and recovering the purified DPPD from the solution.

Process for the stabilizing of an organosilane

A process is provided for the oxidation of p-xylene and methyl p-tolulate with oxygen-containing gases in the Witten-Hercules process for preparing dimetyl terephthalate in at least two sequentially arranged stages and in the presence of a catalyst, wherein the process involves oxidizing p-xylene and methyl p-toluate with oxygen containing gases in at least two sequential stages in the presence of a catalyst, wherein the at least two sequential stages include at least one p-xylene rich stage and at least one methyl p-toluate rich stage, wherein at least one of the following steps (a) and (b) occurs:

Oxidation in the Witten-Hercules process for preparing dimethyl

Cyclic silane esters and solvolysis products thereof and processes for making these materials. The cyclic silanes and their solvolysis products are useful as adhesives, crosslinking agents and reagents for modifying polymers containing ester groups.

Cyclic silane esters and solvolysis products thereof, and processes for

The invention relates to a process for preparing amino-functional organosilanes which are low in chlorofunctional organosilanes or essentially free of chlorofunctional organosilanes, by reacting chloro-functional organosilanes with organic amines or ammonia and separating off the organic ammonium chlorides and/or the ammonium chloride thus formed, wherein the small amounts of chloro-functional organosilanes which have not reacted with ammonia or alkylamines are reacted by addition of at least one metal alkoxide in a reaction downstream of the aminosilane synthesis.

Process for preparing amino-functional organosilanes low in or free of

Water-based organopolysiloxane-containing compositions which are essentially free from organic solvents, have a flashpoint above 80.degree. C., and essentially liberate no alcohols by hydrolysis on dilution with water are obtainable by mixing water-soluble aminoalkylalkoxysilanes with alkyltrialkoxysilanes and/or dialkyldialkoxysilanes and/or mixtures of alkyltrialkoxysilanes and dialkyldialkoxysilanes which are not water-soluble, adding water to the mixture, adjusting the pH of the reaction mixture to a value of between 1 and 8 and removing any alcohol already present and/or formed during the reaction. Such compositions are especially useful for hydrophobicizing the surface of building materials such as brick, concrete, lime sand brick, and mortar.

Water-based organic polysiloxane-containing compositions, processes for

Process for preparing alkylhydrogenchlorosilanes

3-Acryloyloxypropylalkoxysilanes of formula I:

Process for the preparation of 3-acryloyloxypropylalkoxysilanes

The present invention relates to a process for preparing low-chloride or chloride-free aminofunctional organosilanes by reacting chlorofunctional organosilanes with organic amines or ammonia and separating off the organic hydrochlorides or ammonium chloride thus formed, wherein further amounts of organic hydrochlorides or ammonium chloride present are reacted by addition of metal alkoxides dissolved in alcohols and the metal chlorides formed are separated off, and also to aminofunctional organosilanes prepared thereby.

Process for preparing low-chloride or chloride-free aminofunctional

3-Halo- and pseudohalo-alkylsilane esters are prepared by reacting an allyl X compound or a compound containing an allyl X structure with a hydridosilane ester in the presence of an iridium catalyst prepared under specific conditions and/or the reaction medium containing a 0.01-100 mol % excess of the allyl X compound or compound containing the allyl X unit relative to the amount of hydridosilane ester reactant.

Process for the preparation of 3-halo-and pseudohalo-alkylsilane esters

Process for preparing aminopropylalkoxysilanes in the presence of shaped

Hydrogenalkoxysilanes are prepared by direct reaction of finely divided metallic silicon with alcohols in the presence of copper-containing catalysts in a heat-transfer oil comprising tritoluenes, tetratoluenes or mixtures thereof at from 100.degree. to 350.degree. C.

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Duelmen, Germany

Hans-Guenther Srebny