Dow Corning Corporation

Dow Silicones Corporation

Brian P Deeth

John Joseph Kennan

Kevin Lewis

Charles Neal

Theodore Oberhellman

Simon Parsley

Yoshiyuki Tanaka

Kevin Dale Lewis

Silicone-polyether block copolymers are disclosed, having the average formula: RRSi(ORSi){[RO(CHO)RRSi(ORSi)]RO(CHO)RRSi)}OSiRRwherein Ris C-Chydrocarbyl; Ris C-Chydrocarbylene; Ris Ror H; Ris &#x2014;R&#x2014;NRor &#x2014;R&#x2014;NR&#x2014;R&#x2014;NR; Ris Ror R; h is 1 to 100; k is 2 to 500; m is 2 to 500; n is 0 to 30; p is 2 to 120; and q is 2 to 4. The silicone-polyether block copolymers comprise two terminal amine functionalities and may comprise varying degrees of pendent amine functionality. In a method for synthesizing linear silicone-polyether block copolymers of the above formula, a reaction mixture is formed by combining a polyether, an organosilicon component, an endblocking agent, and a catalyst. Thereupon, the reaction mixture is heated to produce a silicone-polyether block copolymer having at least one pendent amine functionality and a number-average molecular weight from 2000 to 500,000. Also disclosed are silicone-polyether block copolymers prepared according to the above method.

Reactive amine-functional silicone-polyether block copolymers

A process is disclosed for the preparing silicone polyethers by reacting; (A) a polyether having at least one terminally unsaturated aliphatic hydrocarbon group and an alkali metal content of less than 50 ppm, (B) an organohydrogensiloxane having an acid number of less than 0.005, via a hydrosilylation reaction. The process is particularly useful to prepare silicone polyethers of improved quality via a continuous process.

Process for preparing silicone polyethers

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Midland, MI, United States of America

Brian P Deeth