Preparation of mesophasic polyborazylene mesophasic polyborazylene and use as a BN precursor
US6277348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Dec 27, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/03
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to: PA1 a novel process for the preparation of mesophasic polyborazylene. Said process is of particular value in that it affords a quality product from an appropriate polyborazylene, rapidly (virtually instantaneously), reproducibly and with a good yield. Furthermore, said process is easy to carry out. Said process comprises the preparation of polyborazylene by the polycondensation of borazine in a closed reactor and the addition, to said polyborazylene obtained by polycondensation, of a solvent selected from aromatic solvents, borazine solvents and mixtures thereof, PA1 mesophasic polyborazylene which is novel in that it is in the presence of a particular solvent and/or by virtue of its quality, PA1 the use of said polyborazylene of the invention, and/or prepared according to the invention, as a boron nitride precursor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.