Method for preparing functionalised polyorganosiloxane resins by redistribution in the presence of at least one triflic acid derivative
US7402647B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Mar 20, 2003 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Jul 27, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing functionalized polyorganosiloxane (POS) resins comprising units M: (R3SiO1/2), Q: (SiO4/2) and M′: (YaR3-aSiO1/2) and optionally D: (R2SiO2/2) and/or D′: (RYSiO2/2) and T: (RSiO3/2) and/or T′: (YSiO3/2), with, in these units: R=C1-C10 alkyl or a C8-C12 aryl and Y a functional group (e.g.: Si—H),by redistribution of POS resins using POSf bearing functional units M′ and/or D′ and/or in the presence of an acid catalyst of the trifluoromethane-sulfonimide (TFSI) type.The present invention also relates to the aforementioned catalyst system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.