Polymerization catalyst system using...

C - Chemistry – Metallurgy – 08 – F

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C08F 110/06 (2006.01) C08F 4/42 (2006.01)

Patent

CA 2545483

It has been discovered that using di-sec-butyldialkoxysilanes, such as di-sec- butyldimethoxysilane (DSBDMS), as external electron donors for Ziegler-Natta catalysts can provide a catalyst system that may prepare polypropylene films with improved properties and processing. The catalyst systems of the invention provide high activity, high bulk density, moderate hydrogen response, moderate donor response and high polydispersity (MWD). Suitable di-sec- butyldialkoxysilanes have the formula (sBu)2Si(OR")2, where R" is independently a straight or branched alkyl group of 1-5 carbon atoms.

On a découvert qu'en utilisant des di-sec-butyldialcoxysilanes, tels que du di-sec-butyldiméthoxysilane (DSBDMS), comme donneurs d'électrons externes pour catalyseurs de Ziegler-Natta, on peut produire un système catalytique permettant de préparer des films de polypropylène avec des propriétés et une aptitude à la transformation améliorées. Ces systèmes catalytiques assurent une forte activité, une densité apparente élevée, une réponse modérée à l'hydrogène, une réponse modérée aux donneurs et une polydispersité élevée (MWD). Les di-sec-butyldialcoxysilanes appropriés sont représentés par la formule (?s¿Bu)¿2?Si(OR")¿2?, dans laquelle R" représente séparément un groupe alkyle droit ou ramifié ayant 1 à 5 atomes de carbone.

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