Catalysts for the polymerization of olefins and process for...

C - Chemistry – Metallurgy – 08 – F

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C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2274903

Catalysts for the polymerization of olefins are disclosed, comprising the product obtainable by contacting: (A) a bridged and/or substituted cyclopentadienyl compound of Ti, Zr or Hf; (B) one or more organometallic aluminium compounds of formula (II): A1R43-zHz wherein the substituents R4, same or different from each other, are linear or branched, saturated or unsaturated C1-C20 alkyl or alkylaryl radicals, optionally containing Si or Ge atoms, wherein at least one of the substituents R4 is different from a straight alkyl group; z is 0 or 1; and (C) water; the molar ratio between the organometallic aluminium compound and water being comprised between 1:1 and 100:1; said catalyst being obtainable by a process comprising the following steps: (i) contacting component (A) with part of component (B) in the absence of component (C); (ii) contacting part of component (B) with component (C) in the absence of component (A) and successively (iii) contacting the products obtained in steps (i) and (ii).

L'invention concerne des catalyseurs de polymérisation d'oléfines. On obtient ces catalyseurs en mettant en contact: (A) un composé cyclopentadiényle ponté et/ou substitué de Ti, Zr ou Hf; (B) un ou plusieurs composés d'aluminium organométallique de formule (II): A1R?4¿¿3-z?H¿z?, dans laquelle les substituants R?4¿, qui sont identiques ou différents les uns des autres, sont des radicaux alkyle ou alkylaryle en C¿1?-C¿20? linéaires ou ramifiées, saturés ou insaturés, contenant éventuellement de atomes Si ou Ge, et au moins un des substituants R?4¿ étant autre chose qu'un groupe alkyle linéaire; z est 0 ou 1; et (C) de l'eau. Le rapport molaire entre le composé d'aluminium organométallique et l'eau est compris entre 1:1 et 100:1. On obtient ces catalyseurs par un procédé comprenant les étapes suivantes: (i) on met en contact le composant (A) avec une partie du composant (B) en l'absence du composant (C); (ii) on met en contact une partie du composant (B) avec le composant (C) en l'absence du composant (A) puis (iii) on met en contact les produits obtenus lors des étapes (i) et (ii).

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