Exxonmobil Chemical Patents Inc.

Gregory J Karahalis

Jian Yang

Timothy Marlow Boller

Patrick Brant

John Robert Hagadorn

Evan J Morris

Yan Jiang

This invention relates to catalyst systems comprising a catalyst compound having a bridged group 4 metal metallocene (where the bridge preferably contains an (MeSi)group, an activator, and a support material. In some embodiments, the present disclosure provides for polyolefins and a process for producing a polyolefin composition comprising contacting at least one olefin with a catalyst system.

(Di)silicon bridged metallocenes that produce polyethylene with broad molecular weight distribution and high molecular weight

The present disclosure provides novel unbridged group 4 indacenyl-containing metallocene compounds. The catalyst system may be used for olefin polymerization processes.

Unbridged indacenyl metallocenes

The present disclosure relates to asymmetric ansa-metallocene catalyst compounds that include at least one indenyl ligand substituted at the 3-position with a C-C&#x3b1;-branched alkyl, such as 1-methylethyl, 1-methylpropyl, 1-methylbutyl, 1-ethylbutyl, 1,3-dimethylbutyl, 1-methyl-1-ethylbutyl, 1,1-diethylbutyl, 1-propylpentyl, and the like. Catalyst systems prepared with the catalyst compounds, polymerization methods using such catalyst systems, and polyolefins made using the polymerization methods are also described.

Asymmetric-metallocene catalyst compounds for producing polyolefins having a broad molecular weight distribution

The present disclosure relates to ansa-metallocene catalyst compounds that include (1) a first indenyl ligand substituted at the 3-position with a substituted or unsubstituted C-Chydrocarbyl group, wherein the hydrocarbyl group is branched at the &#x3b2;-position, and (2) a second indenyl ligand substituted at its 3-position with a substituted or unsubstituted alkyl group or a &#x3b2;-branched alkyl group. Catalyst systems prepared with the catalyst compounds, polymerization methods using such catalyst systems, and polyolefins made using the polymerization methods are also described.

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Houston, TX, United States of America

Gregory J Karahalis