Dow Silicones Corporation

Phillip Griffith

Timothy J Gallagher

James Andrew Kenney

An improved process for the preparation of high viscosity (i.e., greater than 1 million mPa·s at 25° C.) silanol-terminated silicone polymers and copolymers, often referred to in the industry as silanol-terminated silicone polymer gums. The silanol-terminated silicone polymer gums are made by the ring-opening polymerisation of organocyclosiloxane oligomers (alternatively referred to as cyclic siloxane oligomers) using a conical screw dump extruder (). It also relates to silanol-terminated silicone polymer gums made by the process.

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Midland, MI, United States of America

Phillip Griffith