Degussa Aktiengesellschaft

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Evonik Degussa Gmbh

Ulrich Deschler

Peter K Kleinschmit

Rudolf Michel

Siegfried Wolff

Peter Panster

Roland Krafczyk

Karsten Korth

Ewe-Hong Tan

Christoph Batz-Sohn

Hans-Detlef Luginsland

Ingo Kiefer

Alfred Alig

Michael Horn

Andre Hasse

Reimund Pieter

Gerd Rainhard Zezulka

J&ouml;rg M&uuml;nzenberg

Karl-Heinz R&uuml;tzel

Georg Hellwig

Philipp Albert

Reinhard Stober

Guenter Prescher

Werner Will

Oliver Klockmann

Ralf Goedecke

Hans Christian Alt

Raymund Sonnenschein

Wolfgang Buder

Susann Witzsche

Jorg Munzenberg

Udo Gorl

Andreas Grund

Thomas Gobel

Ulrike Lechner

Albert Frings

Michael Witzel

Louis Janssens

Robert Magiera

Melanie Mayer

Volker Knapp

Christoph Klatte

Inge Kiefer

Stefan Lotter

Helmut Droege

Sefan Koenigstein

Bj&ouml;rn Treffeisen

Stephanie Schwan

Gerhard Rasig

Helmut DRÖGE

Stefan Koenigstein

The invention relates to a process for preparing organosilanes of the general formula I by reacting (haloorganyl)alkoxysilane of the formula II with hydrous alkali metal hydrogensulphide, sulphur and alkali metal carbonate in alcohol, wherein the molar (haloorganyl)alkoxysilane of the formula II to alkali metal hydrogensulphide ratio is between 1:0.4 and 1:0.75, and the molar alkali metal hydrogensulphide to alkali metal carbonate ratio is between 1:0.5 and 1:1.5.

Process for preparing organosilanes

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

Organosilicon compounds of the general formula I  

Organosilicon compounds

A process for the preparation of an organosilicon compound of the formula (I)(RRRSiR)S&#x2003;&#x2003;(I)by reacting haloalkoxysilanes of the general formula (II)RRRSiRX&#x2003;&#x2003;(II)with a dry polysulphide of the general formula (III)MS&#x2003;&#x2003;(III)and/or dry sulphide of the general formula IVMS&#x2003;&#x2003;(IV)and optionally sulphur in an organic solvent, the organic solvent being removed from the resulting suspension, the mixture containing the organosilicon compound of the general formula (I) and the solid MX being mixed with water containing at least one buffer, and the resulting phases being separated.

Process for the preparation of organosilicon compounds

Organosilicon compounds of the general formula I and/or II are produced by reacting silanes of the general formula III with alcohols of the general formula R'&#x2014;OH, with elimination of R&#x2014;OH, wherein R&#x2014;OH may be continuously separated from the reaction mixture by distillation. The organosilicon compounds may be used in rubber mixtures. Compounds, such as rubbers, produced using such organosilicon compounds.

Organosilicon compounds of the general formula I and/or IIare produced by reacting silanes of the general formula IIIwith alcohols of the general formula R'&#x2014;OH, with elimination of R&#x2014;OH, wherein R&#x2014;OH may be continuously separated from the reaction mixture by distillation. The organosilicon compounds may be used in rubber mixtures. Compounds, such as rubbers, produced using such organosilicon compounds.

Process for the production of yellow bis(3-&lsqb;trialkoxy-silyl&rsqb;alkyl)polysulfanes with an iodine color index of &lE;10 mg iodine/100 ml, in which an organic acid is added to neutral chloroalkyltrialkoxysilane and then reacted with sodium polysulfide (NPS) or sodium sulfide (Na S) and sulfur or sodium polysulfide (NPS) and Na S in alcohol.

Process for the production of yellow bis(3-&lsqb;trialkoxysily&rsqb;alkyl) polysulfanes

Process for the production of yellow bis(3-&lsqb;triethoxysilyl&rsqb;propyl)polysulfane with an average sulfur chain length of less than 4 and an iodine colour value of &lE;10 mg iodine/100 ml, wherein neutral chloropropyltriethoxysilane is mixed with chloropropyltrichlorosilane and then reacted with sodium sulfide (Na S) and sulfur, disodium tetrasulfide (Na S ) and Na S or disodium trisulfide (Na S ) and Na S in ethanol.

Process for the production of yellow bis(3-&lsqb;triethoxysilyl&rsqb;-propyl) polysulfane

A process is disclosed for the preparation of anhydrous sodium sulfide by heating sodium sulfide having a water content of from 38 to 40% in a contact drier in vacuo, the temperature of the solid to be dried being increased from approximately 20&deg; C. at the solid inlet to &gE;180&deg; C. at the solid outlet.

Process for the preparation of anhydrous sodium sulfide

The invention relates to a process for the preparation of organosilylalkylpolysulfanes, of the general formula I (R R R SiR ) S (I) by reaction of organosilylalkylpolysulfanes of the general formula II (R R R SiR ) S (II) with an ionic sulfide of the general formula M S (III) and an organosilylalkyl halide of the general formula R R R SiR X (IV), the long-chain organosilylalkylpolysulfane of the general formula (II) and the organosilylalkyl halide of the general formula (IV) being initially introduced into the reaction vessel and the ionic sulfide of the general formula (III) being added to this solution in several portions.

Process for the preparation of organosilylalkylpolysulfanes

Process for the preparation of yellow bis(3-&lsqb;triethoxysilyl&rsqb;propyl)tetrasulfane having an iodine colour value of &lE;10 mg of iodine/100 ml, in which process a small amount of chloropropyltrichlorosilane is added to neutral chloropropyltriethoxysilane and reaction with sodium polysulfide or with Na S and sulfur in ethanol is then carried out.

Process for the preparation of yellow bis (3-&lsqb;triethoxysilyl&rsqb;propyl) tetrasulfane

Mixtures are disclosed of bis(silylorganyl)polysulfanes and silylorganylthiocyanates, which are produced by reacting polysulfanes with cyanides. The inorganic thiocyanate formed is subsequently allowed to react with a haloalkylalkoxysilane to form the silylorganylthiocyanate. These substances are used in plastic and rubber mixtures reinforced with silica and optionally carbon black.

Mixtures consisting of bis (silylorganyl) polysulfans and

Bis(2,4-organylthio-s-triazine-6-yl) polysulfides of the general Formula (I) ##STR1## prepared from compounds of the general formula (II) ##STR2## and from an ammonium or alkali polysulfide and the use of such compounds as accelerators in vulcanizable rubber mixtures.

Vulcanizable rubber mixtures containing

A method of preparing pure 3-butenyl triorgano oxysilanes, the intermediate products 3,4-dichlorobutyl triorgano oxysilanes and the use of the final products in rubber mixtures reinforced with silicic acid and vulcanizable with peroxides. 3,4-dichlorobutene-1 and trichlorosilane are used as initial products.

Method of preparing pure 3-butenyl triorganooxysilanes, the intermediate

Novel cyclic N,N,N' and N,N,N',N'-substituted organyloxysilyl-functional silanes are prepared by reacting an aminopropyl silane with carbon disulfide and heating the dithiocarbamate.

Substituted organyloxysilyl-functional, cyclic thioureas

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Sailauf, Germany

Ulrich Deschler