Preceramic polycarbosilane derivatives
US4761458A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1987 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Aug 17, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/571
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Halogenated polycarbosilanes are prepared by reacting a polycarbosilane containing at least 0.1 weight percent Si-H groups with a halogenating reagent selected from the group consisting of chlorine, bromine, phosphorous pentachloride, phosphorous pentabromide, antimony pentachloride, N-chlorosuccinimide, N-bromosuccinimide, sulfonyl chloride, and mixtures of CH.sub.e X.sub.f and a free radical initiator where e is 0 or 1, f is 3 or 4, the sum (e+f) is 4, and X is chlorine or bromine. The halogenated polycarbosilanes can be further treated to produce other derivatized polycarbosilanes. The halogenated and derivatized polycarbosilanes can be converted to silicon carbide-containing ceramic materials by pyrolysis at elevated temperatures under an inert atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.