Prepolymerized catalyst components for the polymerization of...

C - Chemistry – Metallurgy – 08 – F

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C08F 4/654 (2006.01) C08F 4/647 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2289027

The invention provides new prepolymerized catalyst components for the (co)polymerisation of olefins CH2=CHR, wherein R is hydrogen or a C1-C12 alkyl group, characterized by comprising a solid catalyst component, comprising Ti, Mg, halogen and an electron donor compound, being capable of yielding, under standard polymerization conditions, a propylene homopolymer having an insolubility in xylene at 25 ~C higher than 90 %, which is prepolymerized with ethylene to such an extent that the amount of the ethylene prepolymer is up to 100g per g of said solid catalyst component. These such catalyst components allow to obtain a high catalyst activity, a high isotactic index and are not affected by aging.

L'invention concerne de nouveaux constituants catalytiques prépolymérisés servant à copolymériser des oléfines CH¿2?=CHR, dans laquelle R représente hydrogène ou un groupe alkyle C1-C12, caractérisés par le fait qu'ils comprennent un constituant catalytique solide contenant Ti, Mg, halogène et un composé donneur d'électrons capable de produire, dans des conditions de polymérisation normalisées, un homopolymère de propylène dont l'insolubilité dans xylène à 25 ·C est supérieure à 90 %, qui est prépolymérisé avec éthylène de telle manière que la quantité du prépolymère d'éthylène est au maximum de 100 g par g dudit constituant catalytique solide. Ces constituants catalytiques permettent d'obtenir une activité catalytique élevée, un indice isotactique important et le vieillissement n'exerce aucun effet sur eux.

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