Patent · US Expired

Polysilazanes, processes for their preparation, ceramic materials which contain silicon nitride and can be prepared from them, and preparation thereof

US4946920A · kind A · utility

27Cited by

9References

9Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Tilo Vaahs · Kelkheim, DE
Hans-Jerg Kleiner · Kronberg, DE
Marcellus Peuckert · Hofheim, DE
Martin Bruck · Hofheim, DE

Key dates

Filing date	Dec 2, 1988
Grant date	Aug 7, 1990
Priority date	—
Expiry date	Dec 2, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B35/589
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to novel polysilazanes, their preparation, their further processing to ceramic material containing silicon nitride and this material itself. To prepare the polysilazanes, Si,Si'-diorganyl-N-alkyl-tetrachloro-disilazanes of the formula RSiCl.sub.2 -NR'-SiCl.sub.2 R are reacted with ammonia. The polysilazanes can then be pyrolyzed to ceramic material containing silicon nitride. The polysilazanes according to the invention dissolve in the customary aprotic solvents.

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