| 摘要 |
This invention relates to a method to polymerize olefins comprising contacting olefins with a catalyst system comprising a transition metal catalyst compound and at least two boron containing NCA activators represented by the formula: ?d+ (Ad-), where Z is (L- H) or a reducible Lewis acid, wherein L is a neutral Lewis base; H is hydrogen; (L-H) is a Bronsted acid; Ad- is a boron containing non-coordinating anion having the charge d-; d is 1, 2, or 3; and where in the first NCA activator Z is a Bronsted acid and in the second NCA activator Z is a reducible Lewis acid. This invention also relates to a method to polymerize olefins comprising contacting olefins with a catalyst system comprising a transition metal catalyst compound and at least two NCA activators, where at least one NCA activator is as described in Formula I and at least one NCA activator is not as described in Formula I. This invention also relates to a method to polymerize olefins where the two NCA activators are as described in Formula I except that the N in the second NCA in the ArNHal is at a different position in the nitrogen containing aromatic ring than the N in the first NCA. |
