Method of polymerizing an olefin
AssigneeDow Global Technologies LLC
InventorsLinfeng Chen, Mehmet Demirors
Life of this patent
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Abstract
A method of polymerizing an olefin using a combination of a Ziegler-Natta catalyst and an unsupported molecular catalyst in a same reactor at the same time to give a polyolefin product, and the polyolefin product made by the method. Also, methods of preparing the combination of (pro)catalysts.
Claims13
A method of polymerizing an olefin using a Ziegler-Natta catalyst and an unsupported molecular catalyst in a same reactor at the same time, the method comprising simultaneously contacting at least one polymerizable olefin in the reactor with the Ziegler-Natta catalyst and the unsupported molecular catalyst in a saturated or aromatic hydrocarbon liquid under effective conditions to give a polyolefin product comprising a mixture of a first polyolef in made by a first polymerization reaction catalyzed by the Ziegler-Natta catalyst and a second polyolefin made by a second polymerization reaction catalyzed by the unsupported molecular catalyst.
The method of claim 2 wherein the first or second activation reaction further comprises contacting at least one of the (B) magnesium halide-supported titanium procatalyst with (G) an organoborate or (H) an organoboron;
- and/or the third activation reaction further comprises contacting the unsupported molecular ligand-metal complex procatalyst with (G) an organoborate or (H) an organoboron.
A polymerization method of polymerizing an olefin using an enhanced Ziegler-Natta catalyst and an unsupported or supported molecular catalyst in solution-phase process in a same reactor at the same time, wherein the enhanced Ziegler-Natta catalyst consists essentially of a product of a first activation reaction of (A) a hydrocarbylaluminoxane and (B) a magnesium halide-supported titanium procatalyst in (C) a saturated or aromatic hydrocarbon liquid, wherein the (B) magnesium halide-supported titanium procatalyst has been prepared by contacting (D) a solid particulate consisting essentially of magnesium halide with (E) titanium tetrachloride in the (C) saturated or aromatic hydrocarbon liquid so as to give the (B) magnesium halide-supported titanium procatalyst;
- and wherein the unsupported or supported molecular catalyst consists essentially of a product of a third activation reaction of an unsupported or supported molecular ligand-metal complex procatalyst with (A) a hydrocarbylaluminoxane and/or (G) an organoborate or (H) an organoboron;
- the method comprising simultaneously contacting at least one polymerizable olefin in the solution phase in the reactor with the enhanced Ziegler-Natta catalyst and the unsupported or supported molecular catalyst in a saturated or aromatic hydrocarbon liquid under effective conditions to give a polyolefin product comprising a mixture of a third polyolefin made by a third polymerization reaction catalyzed by the Ziegler-Natta catalyst and a fourth polyolefin made by a fourth polymerization reaction catalyzed by the unsupported or supported molecular catalyst.
Dependencies are inferred from the claim text.