Method for making and using a prepolymerized olefin...

C - Chemistry – Metallurgy – 08 – F

Patent

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C08F 4/02 (2006.01) B01J 31/22 (2006.01) C08F 2/06 (2006.01) C08F 4/642 (2006.01) C08F 10/00 (2006.01) C08F 4/659 (2006.01)

Patent

CA 2287840

A catalyst is prepared by creating a catalyst solution by combining an aluminoxane with a group 4-6 metallocene having a substituent which has olefinic unsaturation in a suitable ligand to form a liquid catalyst, conducting prepolymerization of an olefin on the liquid catalyst, and separating the resulting solid metallocene-containing catalyst from the reaction mixture, wherein the prepolymerization is conducted below 15 ~C at a constant temperature and/or the resulting solid metallocene-containing catalyst is combined with a particulate polyethylene. Polymerization of olefins using the inventive solid catalyst is also disclosed.

On élabore un catalyseur en créant une solution catalytique selon un procédé qui consiste à combiner un aluminoxane avec un métallocène de groupe 4-6 ayant un substituant qui possède une insaturation oléfinique dans un ligand approprié, afin de former un catalyseur liquide, à effectuer la prépolymérisation d'une oléfine sur ce catalyseur liquide, et à séparer du mélange de réaction le catalyseur contenant le métallocène solide, ladite prépolymérisation étant effectuée en dessous de 15 ·C à une température constante et/ou le catalyseur contenant un métallocène solide qui en résulte est combiné avec un polyéthylène particulaire. La polymérisation d'oléfines à l'aide du catalyseur solide de cette invention est également décrite.

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