Supported catalyst for 1-olefin(s) (co)polymerization

Details Supported catalyst for 1-olefin(s) (co)polymerization Supported catalyst for 1-olefin(s) (co)polymerization

C - Chemistry, Metallurgy

08

F

C08F 4/622 (2006.01) C08F 4/602 (2006.01) C08F 10/00 (2006.01) C08F 4/639 (2006.01) C08F 4/6392 (2006.01)

Patent

CA 2138138

This invention relates to a supported catalyst composition useful in the polymerization of olefins and to a method for its production. The catalyst is formed by first reacting a trialkylaluminum compound with a transition metal metallocence, and subsequently reacting the resulting material with the undehydrated support material to form a solid product containing at least 20 grams of support material per milimole of transition metal. The resulting supported catalyst has a level of activity comparable to that of conventionally made supported catalysts which are achieved at active metal loadings which are reduced from the loadings used in the previously known metallocene-alumoxane catalysts by at least 20 %, and preferably 50 %. The invention particularly relates to the use of undehydrated silica gel containing from 6 to 20 per cent by weight adsorbed water as the catalyst support material.

La présente invention concerne une composition de catalyseur sur support utile pour la polymérisation des oléfines et une méthode pour la production de cette composition. Le catalyseur est formé en faisant d'abord réagir un composé de trialkylaluminium avec un métallocène à base de métal de transition et en faisant ensuite réagir la matière obtenue avec la matière de support non déshydratée pour former un produit solide contenant au moins 20 grammes de matière de support par millimole de métal de transition. Le catalyseur sur support obtenu possède un degré d'activité comparable à celui des catalyseurs sur support fabriqués de manière traditionnelle; on les obtient à des charges de métal actif qui sont inférieures d'au moins 20 %, et préférablement de 50 %, aux charges utilisées dans les catalyseurs de métallocène-alumoxane antérieurement connus. L'invention concerne particulièrement l'utilisation du gel de silice non déshydraté contenant de 6 à 20 % en poids d'eau adsorbée comme matière de support du catalyseur.

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