Preparation of organic silizane polymers and ceramic materials therefrom
US5250648A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/19
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of a ceramic material comprising PA0 a) reacting at least one organochlorosilane of the formula ##STR1## in which R.sup.1 is Cl, H, C.sub.1 - to C.sub.4 -alkyl or phenyl, optionally together with at least one organochlorosilane of the formula ##STR2## in which R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each, independently is Cl, C.sub.1 - to C.sub.4 -alkyl, vinyl or phenyl, with ammonia in an inert solvent at a temperature from about -80.degree. C. to 120.degree. C. to form a product of ammonolysis, PA0 b) polymerizing the product of ammonolysis in the presence of a basic catalyst of the formula EQU R.sup.6 R.sup.7 R.sup.8 R.sup.9 N.sup.+ A.sup.- (IV) PA0 in which PA0 R.sup.6, R.sup.7, R.sup.8 and R.sup.9 each independently is an organic group having 1 to 24 carbon atoms, and PA0 A.sup.- is a basic anion capable of causing deprotonation, to form an organic silazane polymer, PA0 c) sintering the silazane polymer. The silazane polymer and the ceramic are new.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.