Boron/nitrogen preceramic polymers and boron nitride ceramic materials produced therefrom
US5118774A · kind A · utility
6Cited by
4References
27Claims
0Family size
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Key dates
| Filing date | Jan 22, 1991 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Jan 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/62227
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Crosslinked random boron/nitrogen preceramic polymers are prepared by reacting (a) admixture of a trihalogenoborane A and a cyclic boron/nitrogen compound B containing recurring structural units of the following general formula (1): ##STR1## in which A is a halogen atom and R is a hydrogen atom, or a hydrocarbyl, organosilyl or hydrogenoorganosilyl radical, with (b) an amino compound C containing at least one --NH.sub.2 group; the resulting polymers are facilely pyrolyzed into boron nitride ceramic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.