| abstract |
Catalyst system and methods for making and using it. A process for polymerizing olefins to produce a polyolefin polymer having a versatile composition distribution includes contacting ethylene and a comonomer with a catalyst system. The catalyst system includes a first catalyst compound and a second catalyst compound that are co-supported to form a common supported catalyst system. The first catalyst compound includes a compound having the general formula (C 5 H a R 1 b ) (C 5 H c R 2 d ) HfX 2 . The second catalyst compound comprises the following formula (A), wherein each R 3 or R 4 independently comprises H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, and each R 3 or R 4 may be the same or different and each X is independently a leaving group selected from a labile hydrocarbyl, substituted hydrocarbyl, heteroatom group, or a divalent radical linked to an R 3 group It is. [Selection] Figure 1 |