Degussa Aktiengesellschaft

Evonik Degussa Gmbh

Reimund Pieter

Karsten Korth

Philipp Albert

Andre Hasse

Oliver Klockmann

Dorit Wolf

Steffen Seebald

Ulrich Deschler

Reinhard Stober

Michael Huss

Wolfgang Fischer

Alfreg Alig

Hans-Detlef Luginsland

Roland Krafczyk

Susann Witzsche

Alfred Alig

Martin Ober

Jürgen Heidlas

Rudolf Zobel

Kurt Eichenauer

Inge Kiefer

Melanie Mayer

Mercaptosilanes are disclosed of the formula I wherein Ris an alkyl polyether group &#x2014;O&#x2014;(R&#x2014;O)&#x2014;R. They are prepared by a procedure in which a silane of the formula II is subjected to a catalyzed reaction with an alkyl polyether R&#x2014;H, R&#x2014;OH being split off, the molar ratio of the alkyl polyethers R&#x2014;H to the silane of the formula II is at least 0.5 and R&#x2014;OH is separated off from the reaction mixture continuously or discontinuously. They can be used in shaped articles.

Mercaptosilanes and derivatives thereof

A composition containing organosilicon compounds having the formula I and/or II wherein R is ethyl, Ris a mixture such that the proportion of one component of the mixture is 10 to 50 mol % and is the same or different C-Cbranched or unbranched monovalent alkyl, and Ris a branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C-Chydrocarbon is produced by reacting silanes having the formula III with mixtures of alcohols having the general formula R&#x2014;OH, with elimination of R&#x2014;OH, and R&#x2014;OH is continuously separated off from the reaction mixture by distillation. The organosilicon compounds can be used in rubber compounds.

Organosilicon compounds, process for their production and their use

The present invention relates to a process for preparing mercaptoorganyl(alkoxysilanes), by hydrogenating bis(alkoxy-silylorganyl) polysulphides with hydrogen in the presence of at least one alcohol and a doped metal catalyst. The doped metal catalyst comprises at least one substance from the group consisting of iron, iron compound, nickel, nickel compound, palladium, palladium compound, osmium, osmium compound, ruthenium, ruthenium compound, rhodium, rhodium compound, iridium and iridium compound plus at least one doping component.

Process for preparing mercaptoorganyl (alkoxysilanes)

Organosilicon compounds of the general formula I  

Organosilicon compounds

The invention is directed to rubber mixtures comprising rubber, fillers, optionally further rubber auxiliaries and at least one organosilane of the general formula I:RRRSiR&#x2014;SH&#x2003;&#x2003;(I)wherein: The rubber mixtures according to the invention are prepared by mixing rubber, filler, optionally further rubber auxiliaries and at least one organosilane of the general formula I. The rubber mixtures can be used for the production of shaped articles.

Rubber mixtures

The invention concerns a process for producing mercaptoorganyl(alkoxysilanes), wherein bis(alkoxysilylorganyl)polysulfides are hydrogenated at temperatures of &#x3c;190&#xb0; C. and pressures of &#x3c;100 bar with hydrogen and a transition metal catalyst without the addition of water, alcohol or HS.

Process for producing mercaptoorganyl (alkoxysilane)

The invention relates to a process for the preparation of mercaptoorganyl(alkoxysilanes), wherein bis(alkoxysilylorganyl)polysulfides are hydrogenated with hydrogen and a transition metal catalyst in a solvent without the addition of alcohols, HS or water.

Process for the preparation of mercaptoorganyl (alkoxysilanes)

Silane-modified oxidic or siliceous filler with a bead fraction below 75 &#x3bc;m of less than 15 wt. % and a median particle size distribution between of 150 to 500 &#x3bc;m, which is produced by the reaction of at least one microbeaded or microgranular, oxidic or siliceous filler in a compressed gas with at least one silane. The silane-modified oxidic or siliceous fillers are used in rubber compounds.

Silane-modified oxidic or siliceous filler, process for its production and its use

A method for the dry cationization of starch is disclosed by means of reaction with alkylene epoxides in an alkaline medium in the presence of water.

Method for the dry cationization of starch II

A method is disclosed for the dry cationization of galactomannans by means of reaction with alkylene epoxides in an alkaline medium in the presence of water at 5.degree. to 60.degree. and in the presence of a finely divided, hydrophilic silica.

Growing community of inventors

Bensheim, Germany

Reimund Pieter