C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 77/08 (2006.01) C07F 9/535 (2006.01) C07F 9/54 (2006.01)
Patent
CA 2468863
The invention concerns the synthesis of silicone by anionic polymerisation of cyclic organosiloxane oligomers in the presence of a slightly nucleophilic strong base. The invention aims at providing novel strong base catalysts, more efficient in terms of solubility in the silicones, with hydrolysis stability strength and polymerising capacity. To achieve this, the invention provides for the use of ylides derived from aminophosphonium such as for example that of formula: [Me¿3?N)¿3?P-CHMe¿2?]?+¿, MeO or derived from phosphoranylidenes such as that of formula: [Me¿3?P-HC=Pme¿3?]?+¿, t-BuO. The invention also concerns strong base catalysts as novel products.
L'invention concerne la synthèse de silicone par polymérisation anionique d'oligomères organosiloxanes cycliques en présence d'une superbase faiblement nucléophile. Le but de l'invention est de fournir de nouveaux catalyseurs superbasiques, plus performants en termes de solubilité dans les silicones, de stabilité de tenue à l'hydrolyse et de performance de polymérisation. Pour atteindre ce but, l'invention propose la mise en oeuvre de dérivés d'ylures d'aminophosphonium comme par exemple celui de formule : [(Me2N)3P-CHMe2](+), MeO-ou des dérivés de phosphoranylidènes comme par exemple celui de formule : [Me3P-HC=PMe3] +, t-BuO-. L'invention concerne également ces catalyseurs superbasiques à titre de produits nouveaux.
Baceiredo Antoine
Bertrand Guy
Lemeune Alla
Mignani Gerard
Rhodia Chimie
Robic
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