Polymerisation of siloxane polymers
US12331162B2 · kind B2 · utility
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12References
11Claims
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Key dates
| Filing date | May 2, 2023 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | May 2, 2043 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2083/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.