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US 9,441,063 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
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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:
- a half-metallocene titanium compound;
- (ii) an activator-support comprising a solid oxide treated with an electron-withdrawing ion, wherein the solid oxide comprises alumina, silica-alumina, silica-coated alumina, or any combination thereof, and the electron-withdrawing anion comprises sulfate and/or fluoride;
- 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 phosphinimide ligand;
- and
- wherein the olefin polymer has less than or equal to about 0.008 long chain branches (LCB) per 1000 total carbon atoms.
11 more elements
An olefin polymerization process, the process comprising:
- contacting a catalyst composition with ethylene and an olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene 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 ion;
- 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 phosphinimide ligand;
- and
- wherein the ethylene polymer is characterized by:
- a ratio of Mw/Mn in a range from about 4 to about 10;
- a ratio of HLMI/MI in a range from about 15 to about 75;
- and
- a number of short chain branches (SCB) per 1000 total carbon atoms that is greater at Mn than at Mz.
14 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 ion;
- 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 phosphinimide ligand;
- and
- wherein the olefin polymer has an increase in melt index of from about 1 g/10 min to about 5 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.