| 摘要 |
Catalyst systems and methods for making and using the same. A method of polymerizing olefins to produce a polyolefin polymer with a multimodal 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 commonly supported catalyst system. The first catalyst compound includes a compound with the general formula (C5HaR1b)(C5HcR2d)HfX2. The second catalyst compound includes at least one of the following general formulas: In both catalyst systems, the R groups can be independently selected from any number of substituents, including, for example, H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group, among others. |
| 主权项 |
1. A method of polymerizing olefins to produce a polyolefin polymer with a multimodal composition distribution, comprising contacting ethylene and a comonomer with a catalyst system, wherein the catalyst system comprises a first catalyst compound and a second catalyst compound that are co-supported to form a commonly supported catalyst system, wherein the first catalyst compound comprises the following formula:
(C5HaR1b)(C5HcR2d)HfX2 wherein each R1 is independently H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group; each R2 is independently H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group; a and c are ≧3; a+b=c+d=5; at least one R1 and at least one R2 is a hydrocarbyl or substituted hydrocarbyl group; adjacent groups R1 and R2 groups may be coupled to form a ring; and each X is independently a leaving group selected from a labile hydrocarbyl, substituted hydrocarbyl, or heteroatom group, or a divalent radical that links to an R1 or R2 group; and the second catalyst compound comprises the following formula: wherein each R3 is independently H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group; R4 is a hydrocarbyl group, a substituted hydrocarbyl group, or a heteoatom group; each R5 is independently H, a hydrocarbyl group, a substituted hydrocarbyl group, or a heteroatom group; wherein R3, R4, and R5 may be the same or different; and each X is independently a leaving group selected from a labile hydrocarbyl, a substituted hydrocarbyl, a heteroatom group, or a divalent radical that links to an R3, R4, or R5 group. |
