Heterocenes for use in olefin polymerization processes
OwnerThilina Gunasekara, Qing Yang +2inventors
InventorsThilina Gunasekara, Qing Yang, Jared L. Barr, Sierra N. Hinkle
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Abstract
Disclosed herein are heterocene compounds and catalyst compositions containing the heterocene compounds that can be used for the polymerization of olefins. For example, catalyst compositions disclosed herein can be used in polymerization processes to produce olefin polymers having higher molecular weights than catalyst compositions comprising conventional metallocene compounds. The catalyst compositions comprising the heterocenes also may demonstrate an increased metallocene activity as compared to otherwise identical catalyst systems that contain conventional metallocene compounds.
Claims20
A metallocene compound having the formula:
- wherein:
- M is Ti, Zr, or Hf;
- E is C, Si, or Ge;
- Cp is a substituted or unsubstituted cyclopentadienyl group;
- X1 and X2 independently are a monoanionic ligand;
- RA and RB independently are H, C1 to C36 hydrocarbyl group, a C1 to C36 hydrocarboxy group, or a C1 to C36 hydrocarbylsilyl group;
- and
- RX, RY, and RZ independently are H or a C1 to C36 hydrocarbyl group.
A catalyst composition comprising a metallocene compound, an activator, and an optional co-catalyst, wherein the metallocene compound has the formula:
- wherein:
- M is Ti, Zr, or Hf;
- E is C, Si, or Ge;
- Cp is a substituted or unsubstituted cyclopentadienyl group;
- X1 and X2 independently are a monoanionic ligand;
- RA and RB independently are H, a C1 to C36 hydrocarbyl group, a C1 to C36 hydrocarboxy group, or a C1 to C36 hydrocarbylsilyl group;
- and
- RX, RY, and RZ independently are H or a C1 to C36 hydrocarbyl group.
Dependencies are inferred from the claim text.