Method for the preparation of organopolysiloxane

C - Chemistry – Metallurgy – 08 – G

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C08G 77/08 (2006.01) C08G 77/12 (2006.01) C08G 77/20 (2006.01) C08G 77/32 (2006.01) C08G 77/38 (2006.01)

Patent

CA 2061666

A method for the preparation of an organopolysiloxane comprising polymerizing at least one organosiloxane in the presence of a strong acid catalyst, and subsequently neutralizing said catalyst by the addition of a neutralizing agent, is disclosed wherein the neutralizing agent is ammonia gas. The invention leads to a substantial abbreviation in the neutralization time and, because it affords a nearly complete neutralization of the acid catalyst, the method provides an organopolysiloxane which has excellent heat resistance.

Méthode pour préparer un organopolysiloxane, consistant à polymériser au moins un organosiloxane en présence d'un acide fort comme catalyseur, puis à neutraliser le catalyseur par addition d'un agent neutralisant, soit de l'ammoniac gazeux. L'invention permet d'écourter sensiblement le temps de neutralisation et, comme elle aboutit à la neutralisation presque complète de l'acide catalytique, la méthode donne un organopolysiloxane possédant une excellente résistance thermique.

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