Catalyst for the production of organosiloxanes and...

Details Catalyst for the production of organosiloxanes and... Catalyst for the production of organosiloxanes and...

C - Chemistry, Metallurgy

07

F

C07F 9/09 (2006.01) B01J 31/02 (2006.01) C07F 7/02 (2006.01) C07F 7/08 (2006.01) C07F 9/06 (2006.01) C08G 77/08 (2006.01) C08G 77/30 (2006.01) C08G 77/395 (2006.01)

Patent

CA 2166874

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 [R3SiO(R2SiO)m]3P=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.

L'invention concerne un catalysateur pour la fabrication d'organosiloxanes et de polyorganosiloxanes qui sont obtenus principalement en mettant en oeuvre des procédés de polycondensation. Le catalyseur selon l'invention est un produit de décomposition du chlorure de phosphoronitrile avec un composé de formule générale [R3SiO(R2SiO)m]3P=O (I) où les restes R désignent, indépendamment les uns des autres, des restes hydrocarbures de 1 à 6 atomes de carbone, monovalents insaturés et/ou saturés, identiques ou différents, ou un hydrogène, sous réserve qu'un seul atome d'hydrogène par silicium soit lié, et que m ait une valeur comprise entre 0 et 1000. Des composés volatils du silicium, renfermant du chlore, qui se forment durant la réaction, peuvent être séparés, si nécessaire, complètement ou partiellement.

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