Catalyst for polymerizing olefins

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/618 (2006.01) C08F 10/00 (2006.01)

Patent

CA 2179159

The disclosure concerns Ziegler-Natta catalysts. Specifically, magnesium and titanium containing catalysts are disclosed that do not exhibit a well known effect, the "comonomer effect". This effect manifests itself in decreasing activity with decreasing amounts of comonomer in a 1-olefin polymerization. Through the use of magnesium chloride, the effect is shown to be substantially reduced. Further, even where there are comonomers present, the catalysts of this invention show improved catalyst activity in the presence of magnesium chloride.

L'invention concerne des catalyseurs de Ziegler-Natta. De manière spécifique, l'invention a pour objet des catalyseurs contenant du magnésium et du titane et ne produisant pas "l'effet de comonomère" bien connu. Cet effet se manifeste par une activité décroissante lors de la réduction des doses de comonomères dans lae polymérisation d'une oléfine-1. On a observé que cet effet était sensiblement réduit par l'utilisation de chlorure de magnésium. En outre, même en présence de comonomères, les catalyseurs selon l'invention ont une meilleure activité en présence de chlorure de magnésium.

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