Compound comprising a transition metal cation linked to an...

Details Compound comprising a transition metal cation linked to an... Compound comprising a transition metal cation linked to an...

C - Chemistry, Metallurgy

08

F

C08F 4/642 (2006.01) B01J 31/00 (2006.01) B01J 31/14 (2006.01) B01J 31/22 (2006.01) C07F 5/06 (2006.01) C07F 17/00 (2006.01) C08F 10/00 (2006.01) C08F 4/6592 (2006.01) C08F 110/02 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2347732

Highly effective catalyst compositions are described in which a low cost co- catalyst can be employed at very low aluminum loadings. Such compounds are composed of a cation derived from d-block or f-block metal compound, such as a metallocene, by loss of a leaving group, and an aluminoxate anion derived by transfer of a proton from a stable or metastable hydroxyaluminoxane to such leaving group. These catalyst compositions have extremely high catalytic activity and typically have high solubility in paraffinic solvents. Moreover they yield reduced levels of ash and result in improved clarity in polymers formed from such catalysts.

L'invention concerne de nouvelles compositions pour catalyseurs, d'une haute efficacité, dans lesquelles un co-catalyseur d'un coût économique peut être utilisé pour de très faibles charges d'aluminium. De tels composés sont formés d'un cation provenant d'un composé d'un métal du bloc d ou du bloc f, tel qu'un métallocène, par perte d'un groupe labile, et d'un anion aluminoxate obtenu par transfert d'un proton provenant d'un hydroxyaluminoxane vers un tel groupe labile. Ces compositions catalytiques présentent une activité catalytique extrêmement élevée et ont spécifiquement une solubilité élevée dans des solvants paraffiniques. De plus, ils donnent des taux de cendres réduits et procurent une transparence améliorée des polymères formés au moyen de tels catalyseurs.

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