Process for the preparation of preceramic metallopolysilanes and the polymers therefrom
US4762895A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Aug 10, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/444
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the preparation of preceramic metallopolysilanes is described. The process consists of contacting and reacting organohalogendisilanes with metal-containing compounds in the presence of a redistribution catalyst in an inert, essentially anhydrous atmosphere while removing volatile byproducts. The resulting metallopolysilanes contain significant amounts of aluminum, boron, chromium, lanthanum, molybdenum, neodymium, niobium, samarium, tantalum, titanium, tungsten, vanadium, yttrium, or zirconium. Such metallopolysilanes can be prepared with relatively low oxygen levels. These polymers are useful as chemical intermediates to synthesize organosilicon materials or polymers. These polymers are also useful, when fired at high temperatures, to form ceramic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.