Back to results
US 9,951,156 B2Granted
Titanium phosphinimide and titanium iminoimidazolidide catalyst systems with activator-supports
AssigneeChevron Phillips Chemical Company LP
InventorsCarlos A. Cruz, Jared L. Barr, Jeremy M. Praetorius
Life of this patent
Estimating the term…
Abstract
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.
Claims22
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:
- (i) 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;
- and
- wherein the olefin polymer has less than or equal to about 0.008 long chain branches (LCB) per 1000 total carbon atoms.
10 more elements
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:
- (i) 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;
- and
- wherein the olefin polymer has an increase in melt index of at least about 1 g/10 min, based on an increase in hydrogen:monomer weight ratio from 0 to 150 ppmw.
10 more elements
Dependencies are inferred from the claim text.