POLYMERISATION OF SILOXANE POLYMERS
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United States of America
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Issued Date -
Apr 3, 2025
app pub date -
May 2, 2023
filing date -
May 2, 2023
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Abstract
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 (1). It also relates to silanol-terminated silicone polymer gums made by the process.
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