Polyalkylaluminoxane compositions formed by non-hydrolytic...

C - Chemistry – Metallurgy – 07 – F

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C07F 5/06 (2006.01) B01J 31/14 (2006.01) C08F 4/52 (2006.01) C08F 10/00 (2006.01) C08F 4/619 (2006.01)

Patent

CA 2241091

The present invention relates to a process which comprises the non-hydrolytic transformation of an aluminoxane precursor composition, comprising carbon-to-oxygen bonds which can be alkylated by an alkylaluminum moiety, into a catalytically useful aluminoxane composition. In one embodiment of this invention, the catalytically useful aluminoxane composition is a polymethylaluminoxane composition substantially free of trimethylaluminum. The intermediate precursor is formed by the reaction of a trialkylaluminum compound, or a mixture of trialkylaluminum compounds, and a compound containing a carbon-to-oxygen bond, such as an alcohol, ketone, carboxylic acid, or carbon dioxide. Either unsupported or supported polymethylaluminoxane compositions can be formed.

La présente invention se rapporte à un procédé qui comprend la transformation non hydrolytique d'une composition précurseur d'aluminoxane, renfermant des liaisons carbone-oxygène qui peuvent être alkylées par une fraction alkylaluminium, en une composition d'aluminoxane pouvant être utilisée comme catalyseur. Selon une réalisation de cette invention, la composition d'aluminoxane pouvant être utilisée comme catalyseur est une composition de polyméthylaluminoxane pratiquement exempte de triméthylaluminium. Le précurseur intermédiaire est obtenu par la réaction d'un composé trialkylaluminium, ou d'un mélange de composés trialkylaluminium, et d'un composé contenant une liaison carbone-oxygène telle qu'un alcool, une cétone, l'acide carboxylique ou le dioxyde de carbone. Les compositions précitées de polyméthylaluminoxane peuvent être utilisées sans support ou sur support.

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