Preparation of silazane polymers and ceramic materials therefrom
US5229338A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Jul 20, 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 PA1 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 is Cl, C.sub.1 to C.sub.4 -alkyl, vinyl or phenyl, with ammonia in an inert solvent to form a product of ammonolysis, PA1 b) polymerizing the product of ammonolysis in an inert solvent in the presence of a basic catalyst of the formula EQU R.sup.3 R.sup.4 R.sup.5 R.sup.6 N.sup.+ A.sup.- (III) PA1 in which PA2 R.sup.3, R.sup.4, R.sup.5 and R.sup.6 each independently is an organic radical containing 1 to 24 carbon atoms, and PA2 A is a basic anion which is capable of causing deprotonation, thereby to form an organic silazane polymer, PA1 c) rendering the catalyst inactive at a temperature above its decomposition temperature, and PA1 d) sintering the silazane polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.