Polycondensation preparation of polysiloxanes using concurrent acid/base catalysts
US12421353B2 · kind B2 · utility
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Key dates
| Filing date | Jun 21, 2023 |
| Grant date | Sep 23, 2025 |
| Priority date | — |
| Expiry date | Jun 21, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing polysiloxanes is a two-part polycondensation of alkoxy silanes and/or alkoxy siloxanes the process comprising the following steps: (a) hydrolysis of the alkoxy silanes and/or alkoxy siloxanes to hydroxyl-functional silanes and/or hydroxyl-functional siloxanes; and (b) condensation of the hydroxyl-functional silanes and/or hydroxyl-functional siloxanes to form polysiloxane polycondensation product; where the process is characterized by having both gel-type heterogeneous acid catalysts and gel-type heterogeneous base catalysts present concurrently during both the hydrolysis and condensation steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.