Union Carbide Chemicals & Plastics Technology Corporation

Osi Specialties, Inc.

Crompton Gmbh

General Electric Company

Rohm and Haas Company

Witco Corporation

Union Carbide Chemicals and Plastics Company, Inc.

Ck Witco Corporation

James S Ritscher

Thomas E Childress

Scot M Turner

Robert L Ocheltree

Michael Paul Hallden-Abberton

David D Farris

Curtis L Schilling, Jr

Paul E Austin

George M Omietanski

William E Crane

Robert A Kayser

Donald McLeod, Jr

Earl E Malson

Wei T Yang

Kenrick M Lewis

James D Reedy

Donald L Bailey

Mark D Westmeyer

Michael R Powell

Mark P Bowman

Kenneth W Hartman

Renate I Warren

Patrick James Burns

Lawrence G Moody

Robert L Pitrolo

Ronald P Leichliter

Kevin L Bobbitt

Eric Michael Graban

Donald G Beddow

Okey G Tucker, Jr

Wei-Tai Yang

A Direct Synthesis of making organohalosilanes with greater selectivity to the dialkyldihalosilane is disclosed herein. By using nanosized copper catalyst precursors, and preferably nanosized promoters as well, D/T values of greater than 10, and preferably greater than 15, are obtainable with silicon conversions in excess of 80 wt. %. Shorter induction times are realized using the nanosized copper catalysts in the Direct Synthesis. The nanosized copper catalyst precursors most preferably have an average particle size of less than 100 nanometers.

Rochow-M&#xfc;ller direct synthesis using nanosized copper catalyst precursors

Disclosed is a continuous process for producing silicone copolymer using a series of at least one stirred-tank reactor the last of which feeds into at least one plug flow reactor, wherein the crude product stream exiting the last of said stirred-tank reactors is sufficiently homogeneous that the stream which undergoes further reaction in the plug flow reactor does not undergo phase separation.

Continuous manufacture of silicone copolymers

The present invention describes a method for producing epoxyorganosilicon compounds through the platinum-catalyzed hydrosilation reaction of ethylenically unsaturated epoxides and a silicon-hydride in the presence of a carboxylic acid salt. Also taught herein is the use of carboxylic acid salts in compositions of epoxyorganosilicon compounds to provide compositions of greater stability.

Process for producing epoxyorganosilicon compounds

A process for hydrosilation reactions between olefins and hydrosilanes or hydrosiloxanes wherein a portion of the reactor output is recycled continuously to the reactor.

Hydrosilation reaction process with recycle

Disclosed is a continuous process for producing silicone copolymers using a series of at least one stirred-tank reactor, the last of which reactors in said series has crude product stream feeding into at least one plug flow reactor, wherein this crude product stream is sufficiently homogeneous that this stream which undergoes further reaction in the plug flow reactor does not undergo phase separation.

Continuous manufacture of silicone coploymers

Flexible composites, such as those useful as light pipes, may be effectively cured by reactions upon copolymerized alkoxysilane functionality. Improvements in the optical properties of the uncured and cured systems are found when the alkoxysilane monomer is stabilized during preparation, storage, and copolymerization with low levels of non-aromatic stable free radicals or stable free-radical precursors, such as nitroxides.

Cured composite and process therefor

The present invention describes a method for inhibiting the polymerization of unsaturated silanes by the addition of a non-aromatic stable free radical during any of the steps of the formation of the desired silane, the purification of the desired silane, and to the desired silanes, as well as compositions of the inhibitors and the silanes. Particular classes of silanes to be inhibited include acryloxy-, methacryloxy-, and vinyl- functional silanes. The free radicals for use as inhibitors include various nitroxides. The free radicals taught herein are effective as inhibitors at elevated temperatures, for extended periods of time, and even in the absence of molecular oxygen.

Stabilizers for unsaturated, polymerizable organosilicon compounds

Sulfur-containing organosilicon compounds useful as coupling agents in vulcanizable rubbers to enhance various properties, including low rolling resistance for automobile tires, are prepared. Preferred compounds include .OMEGA.,.OMEGA.'-bis (trialkoxysilylalkyl) polysulfides. The compounds are prepared by reacting sodium ethoxylate with hydrogen sulfide gas to yield a sodium sulfide solution, and then reacting this product with a slurried mixture of elemental sulfur and chloropropyltriethoxysilane to form the compound 3,3'-bis (triethoxysilylpropyl) tetrasulfide. The use of hydrogen sulfide gas and sodium metal alcoholates provides an efficient and economical process.

Process for the preparation of silane polysulfides

The present invention provides a class of surface-active siloxane compounds each having a single reactive alkoxysilane moiety. The siloxane compounds are linear or cyclic and are reactive to moisture and to compositions having hydroxyl-functionality.

Surface-active siloxane coating compounds and their use in coatings

The present invention provides an electroless process for making a catalyst in a liquid or gaseous medium comprising contacting a base metal with a chemical cleaning agent and simultaneously or sequentially treating said base metal under reducing conditions with a noble metal-containing material, the catalyst prepared using the process, and a method of using the catalyst.

Noble metal supported on a base metal catalyst

A method for reducing the level of acidic halide contamination in alkoxysilanes by contacting the silane with a stoichiometric excess of (i) a basic reagent, such as in particular, a metal alkoxide and (ii) an acid salt.

Acidic halide neutralization in alkoxysilanes

In a trimethoxysilane preparation from silicon metal and methanol which preparation uses a solvent, a method for removing a siloxane dissolved in the solvent, which method comprises contacting the solvent with a boron-oxygen compound, and optionally an alkali metal alkoxide such as sodium methoxide.

Method for the removal of siloxane dissolved in the solvent employed in

A method for reducing the level of acidic halide contamination in alkoxy silanes, particularly amino alkoxy silanes, by contacting said silane with a salt of an acid having a dissociation constant of greater than about 10.sup.-15.

Reducing halide contamination in alkoxy silanes

A continuous process for producing trimethoxysilane by reacting methanol and silicon metal in the presence of a copper catalyst, and optionally in an inert solvent, in a multiple reactor system containing at least three reactors by having methanol in substantially vapor form flow countercurrently to a stream containing the silicon metal.

Growing community of inventors

Marietta, OH, United States of America

James S Ritscher