Vacuum for the manufacture of siloxane oxyalkylene copolymers

Details Vacuum for the manufacture of siloxane oxyalkylene copolymers Vacuum for the manufacture of siloxane oxyalkylene copolymers

C - Chemistry, Metallurgy

08

G

C08G 65/32 (2006.01) C08G 77/46 (2006.01)

Patent

CA 2242303

Disclosed is an improved process for the manufacture of silicone containing copolymers via a hydrosilation reaction, in which the catalyzed reaction of organohydrosiloxane and olefinic polyether is carried out at between 20-120°C, preferably 70-120°C, under a vacuum between 750-1 mmHg. The reaction under these conditions results in a copolymer of a higher quality as compared to copolymers made by the traditional method without the benefit of a vacuum.

On divulgue un procédé amélioré pour la production de copolymères renfermant du silicone, par une réaction d'hydrosilation, soit une réaction d'un organohydrosiloxane et d'un polyéther oléfinique, en présence d'un catalyseur, entre 20 et 120 degrés C, préférablement entre 70 et 120 degrés C, sous un vide de 750-1 mm de Hg. Dans ces conditions, on obtient un copolymère de qualité supérieure, comparativement aux copolymères produits par des méthodes classiques, sans vide.

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