Titanium Phosphinimide and Titanium Iminoimidazolidide Catalyst Systems with Activator-Supports

摘要

Catalyst compositions containing activator-supports and half-metallocene titanium phosphinimide complexes or half-metallocene titanium iminoimidazolidide complexes are disclosed. These catalyst compositions can be used to produce olefin polymers having relatively broad molecular weight distributions and low levels of long chain branching.

主权项

1. An olefin polymerization process, the process comprising:
contacting a catalyst composition with an olefin monomer and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an olefin polymer, wherein the catalyst composition comprises: a half-metallocene titanium compound; (ii) an activator-support comprising a solid oxide treated with an electron-withdrawing anion; and (iii) an optional co-catalyst; wherein the half-metallocene titanium compound has the formula:wherein:
Cp is a cyclopentadienyl, indenyl, or fluorenyl group; each X independently is a monoanionic ligand; and L is a iminoimidazolidide ligand.