General Electric Company

Momentive Performance Materials Gmbh

John S Razzano

Nancy E Gosh

Patricia P Anderson

Robert Russell Gallucci

Robert James Perry

Slawomir Rubinsztajn

Kenrick M Lewis

Edwin R Evans

Christopher M Hawkins

Bruce A Ashby

William D Kray

Abellard T Mereigh

John D Neely

Verne G Simpson

Dennis P Thompson

Louis P Petersen

George P De Zuba

Yanjun Zhu

Richard B Bush

Todd R Stegman

Slawomir Rubinstajn

Anping Wang

Ned J Reo

Thomas H Fitzgerald

John David Neely

Kenrick Martin Lewis

The present invention is directed to a process for the synthesis of organohalosilane monomers, comprising the steps of (1) forming a slurry of cyclone fines, ultra fines and/or spent contact mass in a thermally stable solvent and reacting the agitated slurry with an organohalide of the formula RX in the presence of an additive for a time and at a temperature sufficient to produce organohalosilane monomers having the formulae RSiHX, RSiHX, RSiX, RSiX, and RSiX; wherein Ris a saturated or unsaturated aromatic group, a saturated or unsaturated aliphatic group, alkaryl group, or cycloaliphatic hydrocarbyl group, and X is a halogen; and (2) recovering said organohalosilane monomers.

Slurry phase direct synthesis of organohalosilanes from cyclone fines

A process for making a fluorosiliconeMDDM'where

Process for producing controlled viscosity fluorosilicone polymers

A method of producing silicone copolymers having fluorinated repeat units (D units) wherein the fluorine content of the copolymer is above about thirty-seven (37) weight percent.

Methods of making high fluorine content fluoro-silicone copolymers

The invention comprises a method for producing fluorosilicone oil by reacting a fluorosilicone trimer with a triorganosilanol in the presence of an alkali silanolate. The polymer may be condensed to increase viscosity and decrease the silanol content of the polymer, and volatiles may be removed by stripping. The method provides a high yield of fluorosilicone oil of narrow viscosity ranges in an efficient reaction, and produces small amounts of waste.

Process for producing fluorosilicon polymers

Process for making silanol stopped oligomeric materials

A process for making organosilyl end-stopped diorganopolysiloxane fluid is provided comprising the steps of reacting an organic end-stopping compound with a fluorosilicone trimer in the presence of a catalytic amount of linear phosphonitrilic acid, and inactivating the linear phosphonitrilic acid, thereby forming organosilyl end-stopped diorganopolysiloxane fluid.

Polymerization process for fluorosilicone polymers

The present invention relates to an improved cracking process for increasing the yield and purity of fluoro-alkyl substituted cyclic compounds by using an alkali metal carbonate for the cracking catalyst.

Cracking of fluorosilicones to produce 1,3, 5-tris

A base catalyzed hydrolysis of dialkoxydiphenylsilanes or dialkoxymethylphenylsilanes in a solvent or solvent mixture wherein dialkoxydiphenylsilanes or dialkoxymethylphenylsilanes are soluble but in which octaphenylcyclotetrasiloxane or tetramethyltetraphenyl-cyclotetrasiloxane is sparingly soluble or insoluble provides for a process to prepare octaphenylcyclotetrasiloxane or sym-tetramethyltetraphenyl-cyclotetrasiloxane in high yield.

Process the production of octaphenylcyclotetrasiloxane

A batch or continuous process for the production of low molecular weight hydrogen siloxanes catalyzed by soluble phosphonitrilic halides or solid acid catalysts such as acid washed clays, zeolites and ion exchange resins.

Production of low molecular weight linear hydrogen siloxanes

Silicone oil-silica filler paste is provided which can be used in liquid injection molding applications. The silicone paste is made by blend reinforcing silica filler with silicone oil while it is refrigerated to produce a material having an improved application rate.

Silicone oil-silica filler paste useful in liquid injection molding

The present invention is concerned with the use of linear phosphonitrilic chloride catalyst to make low molecular weight linear siloxanes.

Process for producing octamethyltrisiloxane

The present invention relates to a new silicone cure system. More particularly, the present invention discloses that a siloxane system containing sufficiently high levels of T or Q species in addition to M, D and a limited amount of silanol species can be cured by linear phosphonitrilic chloride disproportionation catalyst.

Process for the production of crosslinked siloxanes by disproportionation

A process disclosed for the production of organosiloxanes which is based on the use of a judiciously selected catalyst, e.g., a phosphorus-nitrogen homopolymeric or oligomeric compound, a derivative thereof, a complex thereof, sulfuric acid, a fluorinated alkane sulfonic acid, a kaolin clay, or a mixture of any of the foregoing, to disproportionate or to condense and disproportionate a mixture of two different organosiloxanes which have different molecular weights, without, at the same time, increasing the cyclics content of the mixture.

Process for the production of linear organosiloxane polymers by

The present invention relates to an improved cracking process for continuously making cyclic siloxanes.

Siloxane cracking process

A composition comprising an aromatic carbonate polymer wherein in the backbone of said polymer there is a siloxane unit of the structure below ##STR1## wherein n is an integer of one to about 100, R and R' are each selected from the group consisting of alkyl of one to twelve carbon atoms, inclusive, cycloalkyl of four to eight carbon atoms, inclusive, aryl or six to twenty carbon atoms, inclusive, aryl substituted alkyl of seven to twenty two carbon atoms, inclusive, and A ##STR2## wherein p is an integer of zero to about 4, R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5, are the same or different and are selected from hydrogen, alkyl of one to six carbon atoms, inclusive, and with the proviso that there is sufficient A present that the flame retardance of the polymer is enhanced compared to the polymer without the said siloxane unit.

Growing community of inventors

Cohoes, NY, United States of America

John S Razzano