Catalyst compounds, catalyst systems thereof and their use in a polymerization process
AssigneeUnivation Technologies, LLC
InventorsDonna J. Crowther, Phillip T. Matsunaga, Ching-Tai Lue
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Abstract
The present invention relates to a cyclic germanium bridged bulky ligand metallocene-type catalyst compound, a catalyst system thereof, and to its use in a process for polymerizing olefin(s) to produce enhanced processability polymers.
Claims39
A catalyst system comprising a cyclic germanium bridged bulky ligand metallocene-type catalyst compound and an activator.
A process for polymerizing ethylene alone or in combination with one or more olefin(s) to produce a polymer product in the presence of a catalyst system comprising a cyclic germanium bridged bulky ligand metallocene-type catalyst compound and an activator.
A process for polymerizing ethylene alone or in combination with one or more other olefin(s) in the presence of a catalyst system comprising a cyclic germanium bridged bulky ligand metallocene-type catalyst compound and an activator, the process producing a polymer product having a melt strength greater than 7cN and an I21/I2 of greater than 35.
A continuous gas phase process for polymerizing ethylene and at least one alpha-olefin having from 3 to 20 carbon atoms in the presence of a catalyst system comprising a cyclic germanium bridged bulky ligand metallocene-type catalyst compound, an activator and a carrier, the process producing a polymer product having a density greater than 0.900 g/cc, I21/I2 greater than 35, and a melt strength of greater than 6 cN.
A continuous gas phase process for the polymerization of olefin(s) to produce a polymer product in the presence of a catalyst system comprising a cyclic germanium bridged bulky ligand metallocene-type catalyst compound and activator.
The process in accordance with claim 34 wherein the activator is alumoxane.
The gas phase process in accordance with claim 34 wherein the olefin(s) comprises ethylene alone or in combination with one or more other olefin(s).
A process for polymerizing olefin(s) to produce a polymer product in the presence of a catalyst system comprising a saturatewd or monounsaturated cyclic germanium bridged bulky ligand metallocene-type catalyst compound and an activator.
The process in accordance with claim 37 wherein the activator is alumoxane.
The process of claim 38 wherein the cyclic germanium bridged bulky ligand metallocene-type catalyst compound is represented by the formula:
- LA(R′GeR′)xLBMQn (I)
- where M is a Group 3 to 12 transition metal, LA and LB is an unsubstituted or substituted, cyclopentadienyl ligand or cyclopentadienyl-type bulky ligand bonded to M;
- (R′GeR′)x is a cyclic bridging group bridging LA and LB, and the twoR′'s form a saturated or monounsaturated ring or ring system with Ge;
- independently, each Q is a monoanionic ligand, or optionally two Q's together form a divalent anionic chelating ligand;
- and where n is 0, 1 or 2 depending on the formal oxidation statew of M, and x is an integer from 1 to 4.
An ethylene copolymer having a melt strength greater than 7cN and a I21/I2 greater than 35.
Dependencies are inferred from the claim text.