Process for the preparation of organopolysiloxanes containing organyloxy groups
US5670597A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1995 |
| Grant date | Sep 23, 1997 |
| Priority date | — |
| Expiry date | Jan 31, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of organopolysiloxanes which contain at least one unit of the formula EQU (R.sup.1 O).sub.3-m R.sub.m SiO.sub.1/2 (I) in which PA1 R is identical or different and is a hydrogen atom or monovalent, optionally substituted hydrocarbon radical, PA1 R.sup.1 is identical or different and is a monovalent, optionally substituted hydrocarbon radical having 1 to 8 carbon atoms and PA1 m is 0, 1 or 2, which comprises, in a 1st step, reacting organosilicon compounds (1) which contain at least one Si-bonded hydroxyl group with at least one silane (2) of the formula EQU (R.sup.1 O).sub.4-m SiR.sub.m (II) and/or partial hydrolysates thereof, in which R, R.sup.1 and m have the above mentioned meaning, in the presence of a fluoride salt (3), and, optionally, in a 2nd step, when the reaction has ended, adding component (4) which can bond fluoride ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.