Patent · US Expired

Boron/nitrogen preceramic polymers and boron nitride ceramic materials produced therefrom

US5162558A · kind A · utility

11Cited by

3References

26Claims

0Family size

Assignee

RHONE-POULENC CHIMIE · FR

Inventors

Pierre Ardaud · Sainte-Foy-lès-Lyon, FR
Maurice Charpenel · Val-de-Reuil, FR
Gerard Mignani · Val-de-Reuil, FR

Key dates

Filing date	Oct 6, 1989
Grant date	Nov 10, 1992
Priority date	—
Expiry date	Oct 6, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G79/08
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Organometallic boron/nitrogen polymers, precursors of boron nitride, are prepared by reacting at least one trihalogenoborane with at least one silazane compound containing at least one .tbd.Si--NH--Si.tbd. group, by gradually introducing the silazane compound into the trihalogenoborane, while maintaining the reaction medium at a temperature ranging from -100.degree. to 0.degree. C. and wherein the ratio of the gram equivalents of the .tbd.Si--NH--Si.tbd. groups of the silazane to the number of moles of trihalogenoborane is greater than 1; the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.