Alumoxanes and catalysts comprising alumoxanes

Details Alumoxanes and catalysts comprising alumoxanes Alumoxanes and catalysts comprising alumoxanes

C - Chemistry, Metallurgy

08

F

C08F 4/602 (2006.01) C07F 5/06 (2006.01) C08F 4/02 (2006.01) C08F 10/00 (2006.01) C08F 4/619 (2006.01) C08F 4/6192 (2006.01)

Patent

CA 2180180

A catalyst which exhibits superior control of product particle size in the insertion polymerization of alpha-olefins is described as transition metal compounds which associate with non-coordinating alumoxane anions which are dispersed throughout the interior of a silica support in the form of particles which are less than or equal to about 50 .ANG. (5 nanometers) in diameter. This catalyst is capable of gas phase (e.g. heterogeneous) polymerization of propylene into product granules with a high degree of control over granule particle size distribution and bulk density.

Cette invention concerne un catalyseur qui offre une meilleure régulation de la grosseur particulaire d'un produit, qu'on utilise dans la polymérisation par insertion d'alpha-oléfines comme composés en métal de transition s'associant avec des anions d'alumoxane non-coodonnant dispersés à l'intérieur d'un support au dioxyde de silicium sous forme de particules d'un diamètre inférieur ou égal à environ 50 .ANG. (5 nanomètres). Ce catalyseur est capable de polymériser en phase gazeuse (hétérogène par exemple) du propylène sous forme de produit de granulé tout en régulant de manière très précise la granulométrie particulaire et la densité en vrac.

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