Catalyst compositions and polyolefins for extrusion coating...

C - Chemistry – Metallurgy – 08 – F

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C08F 210/16 (2006.01) C08F 4/642 (2006.01)

Patent

CA 2552748

This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention encompasses a catalyst composition comprising the contact product of a first metallocene compound, a second metallocene compound, at least one chemically-treated solid oxide, and at least one organoaluminum compound. The new resins were characterized by useful properties in impact, tear, adhesion, sealing, extruder motor loads and pressures at comparable melt index values, and neck-in and draw-down.

L'invention concerne le domaine des compositions de catalyseurs de polymérisation oléfinique et des procédés de polymérisation et de copolymérisation des oléfines comprenant des procédés de polymérisation au moyen d'une composition de catalyseur supporté. Dans un mode de réalisation, l'invention concerne une composition de catalyseur comprenant un produit de contact d'un premier composé de métallocène, un second composé de métallocène, au moins un oxyde solide traité chimiquement et au moins un composé d'organoaluminum. Les nouvelles résines sont caractérisées par des propriétés de résistance aux chocs et au déchirement, de pouvoir adhésif, d'étanchéité, de charges et de pressions de moteur d'extrudeur à des valeurs d'indice de fusion comparables et d'exécution de restreint et d'étirage.

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