Robust spray-dried ziegler-natta procatalyst and...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 10/00 (2006.01) C08F 4/02 (2006.01) C08F 4/654 (2006.01)

Patent

CA 2574364

A Ziegler-Natta procatalyst composition in the form of solid particles and comprising magnesium, halide and transition metal moieties, said particles having an average size (D50) of from 10 to 70 ~m, characterized in that at least 5 percent of the particles have internal void volume substantially or fully enclosed by a monolithic surface layer (shell), said layer being characterized by an average shell thickness/ particle size ratio (Thickness Ratio) determined by SEM techniques for particles having particle size greater than 30 ~m of greater than 0.2.

L'invention concerne une composition de procatalyseur de Ziegler-Natta sous la forme de particules solides et comprenant des fractions magnésium, halogénure et métal de transition, lesdites particules présentant une taille moyenne (D50) comprise entre 10 et 70 ?m, caractérisée en ce qu'au moins 5 % des particules présentent un volume de vide interne sensiblement ou totalement enfermé par une couche de surface monolithique (enveloppe), ladite couche étant caractérisée par un rapport moyen de l'épaisseur d'enveloppe/taille des particules (épaisseur relative) déterminé par des techniques SEM pour des particules présentant une taille des particules supérieure à 30 ?m supérieur à 0,2.

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