Catalyst for preparing organosiloxanes or polyorganosiloxanes

US5773548A · kind A · utility

Assignee

• Huels Silicone GmbH · DE

Inventors

• Harald Schickmann · Meißen, DE
• Robert Lehnert · Dresden, DE
• Heinz Wendt
• Holger Rautschek · Großenhain, DE
• Harald Roesler · Dresden, DE
• Hans-Guenther Srebny · Coesfeld, DE

Key dates

• Filing date: Jan 11, 1996
• Grant date: Jun 30, 1998
• Expiry date: Jan 11, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/395
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a catalyst for preparing organosiloxanes and polyorganosiloxanes which are obtained primarily by polycondensation processes. The catalyst of the invention is a reaction product of phosphonitrilic chloride with a compound of the general formula R.sub.3 SiO(R.sub.2 SiO).sub.m !.sub.3 P.dbd.O (I), where R are, independently of one another, identical or different, unsaturated and/or saturated monovalent hydrocarbon radicals having from 1 to 6 carbon atoms or hydrogen, with the proviso that only one hydrogen atom is bound to each silicon atom and m has a value between 0 and 1000. Volatile chlorine-containing silicon compounds formed during the reaction can, if required, be completely or partially removed.