Components and catalysts for the polymerization of olefins

Details Components and catalysts for the polymerization of olefins Components and catalysts for the polymerization of olefins

C - Chemistry, Metallurgy

08

F

C08F 4/642 (2006.01) C08F 4/654 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01) C08F 4/6592 (2006.01)

Patent

CA 2168210

The present invention relates to components of catalysts for the polymerization of olefins comprising a metallocene compound and a magnesium halide which have particular values of porosity and surface area. In particular the components of the invention have surface area (BET) greater than about 50 m2/g, porosity (BET) greater than about 0.15 cm3/g and porosity (Hg) greater than 0.3 cm3/g, with the proviso that when the surface area is less than about 150 m2/g, the porosity (Hg) is less than about 1.5 cm3/g. The components of the invention are particularly suitable for the preparation of catalysts for the gas-phase polymerization of .alpha.-olefins.

La présente invention se rapporte à des constituants de catalyseurs destinés à la polymérisation des oléfines, comprenant un composé organo-métallique et un halogénure de magnésium qui présentent des valeurs de porosité et d'aire de surface particulières. Les constituants suivant l'invention présentent plus particulièrement une aire de surface (méthode BET) supérieure à environ 50 m?2¿/g, une porosité (méthode BET) supérieure à environ 0,15 cm?3¿/g, et une porosité (méthode Hg) supérieure à 0,3 cm?3¿/g, sachant que, lorsque l'aire de surface est inférieure à environ 150 m?2¿/g, la porosité (Hg) est inférieure à environ 1,5 cm?3¿/g. Les constituants selon l'invention conviennent particulièrement à la préparation de catalyseurs pour la polymérisation en phase gazeuse des .alpha.-oléfines.

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