Momentive Performance Materials Gmbh

General Electric Company

Union Carbide Corporation

Union Carbide Chemicals & Plastics Technology Corporation

Witco Corporation

Crompton Gmbh

David D Farris

Mark Leatherman

Chauncey J Rinard

Paul E Austin

James D Reedy

James S Ritscher

Robert A Kayser

William E Crane

Philbert E Ramdatt

Charles H Blevins

Ladislau Heisler

Kunj R Mehta

Raymond L Cobb

David B Davis

Richard A Lehew

An asymmetric siloxane is made by reacting a silicone having the formula MDM'where Mis RRHSiO, M&#x2032;is RRHSiOand x is an integer 0&#x2266;x&#x2266;10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefinic compound and in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating conditions with another olefinic compound different from the first olefinic compound.

Polyalkylene oxide asymmetric siloxane

An asymmetric siloxane is made by reacting a silicone having the formula MDM'where Mis RRHSiO, M&#x2032;is RRHSiOand x is an integer 0&#x2266;x&#x2266;10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefinic compound and in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating conditions with another olefinic compound different from the first olefinic compound. The formed asymmetric siloxane is incorporated into a composition in need of hydrolysis resistance.

Incorporating an asymmetrical siloxane into a composition in need of hydrolysis resistance

An asymmetric siloxane is made by reacting a silicone having the formula MDM'where Mis RRHSiO. M&#x2032;is RRHSiOand x is an integer 0&#x2266;x&#x2266;10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefinic compound and in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating conditions with another olefinic compound different from the first olefinic compound.

Asymmetrical siloxane

Hydrosilylating an isolated monohydridosiloxane

Selective hydrosilylation method with rhodium catalyst

An asymmetric siloxane is made by reacting a silicone having the formula MDM'where Mis RRHSiO, M&#x2032;is RRHSiOand x is an integer 0&#x2266;x&#x2266;10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefinic compound an in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating conditions with another olefinic compound different from the first olefinic compound.

Tetramethyl siloxane reaction

Selective hydrosilylation method with alcohol or epoxide reactant and product

Selective hydrosilylation method and product

An asymmetric siloxane is made by reacting a silicone having the formula MDM'where Mis RRHSiO, M&#x2032;is RRHSiOand x is an integer 0&#x2266;x&#x2266;10 under selective hydrosilylation conditions in the presence of a precious metal hydrosilylation catalyst, with a first olefine compound and in a second step, a monohydridosiloxane produced in the first step is reacted under hydrosilylating condtions with another olefine compound different from the first olefine compound.

Selective hydrosilylation method

A process is disclosed for producing silicone copolymers, wherein the process comprises the steps of:

Continuous manufacture of silicone copolymers via multi-stage blade-mixed plug flow tubular reactor

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

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

Compositions including silicone surfactants of the type used in manufacturing urethane foams and certain siloxane-oxyalkylene copolymers which act as cell openers when employed in combination with silicone surfactants in urethane foam manufacture are disclosed and claimed, as are urethane foam compositions including such cell operers, a method of preparing urethane foams using such cell operers, and urethane foams prepared by the method.

Cell openers for urethane foam surfactants

An improved process is provided for the preparation of siloxane-oxyalkylene block copolymer surfactant compositions which utilized a hydrosilation reaction with high boiling point polar polyols as the reaction solvent. The reaction solvent need not be removed from the block copolymer, particularly when the block copolymer is used as a surfactant for polyurethane foam formulations. Dipropylene glycol is the preferred polar solvent and when used in the preparation of the surfactants need not be removed when the surfactants are employed in the preparation of urethane foams.

Process for the preparation of organopolysiloxane surfactants

An improved process is provided for the preparation of siloxane-oxyalkylene copolymers by a solventless process via hydrosilation of oxyethylene-rich polyethers in the presence of carboxylic acids or carboxylic acid salts as a catalyst modifier. The use of a carboxylic acid or salt prevents acetal formation through the hydroxyl groups of the polyether and/or copolymer. The use of solvent, acetal treatment and solvent stripping steps of the conventional processes are eliminated and accordingly, environmental as well as economic benefits are achieved.

Growing community of inventors

Marietta, OH, United States of America

David D Farris