Process for the preparation of siloxane-oxyalkylene copolymers
US6372874B1 · kind B1 · utility
9Cited by
23References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Dec 4, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/46
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention disclosure describes an improved process for the preparation of siloxane-oxyalkylene copolymers via hydrosilation of unsaturated polyethers with organohydrogensiloxanes in the presence of hydroxyl, carbonyl, or ether-functional amines as buffer-catalyst modifiers for noble metal hydrosilation catalysts. The common side reactions such as dehydrocondensation and acetal formation are significantly reduced or eliminated, by the use of these amines, without reduction in hydrosilation rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.