Modified ziegler-natta (pro) catalysts and system
AssigneeDow Global Technologies LLC
InventorsLinfeng Chen, Mehmet Demirors
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Abstract
A modified Ziegler-Natta procatalyst that is a product mixture of modifying an initial Ziegler-Natta procatalyst with a molecular (pro)catalyst, and optionally an activator, the modifying occurring before activating the modified Ziegler-Natta procatalyst with an activator and before contacting the modified Ziegler-Natta procatalyst with a polymerizable olefin. Also, a modified catalyst system prepared therefrom, methods of preparing the modified Ziegler-Natta procatalyst and the modified catalyst system, a method of polymerizing an olefin using the modified catalyst system, and a polyolefin product made thereby.
Claims11
-15. (canceled)
A modified Ziegler-Natta procatalyst that is prepared by mixing an initial Ziegler-Natta procatalyst and a molecular (pro)catalyst together in (C) a saturated or aromatic hydrocarbon liquid under modifying conditions comprising a modifying temperature less than 100° C. and a modifying time of at least 1 minute, and optionally an activator, to give the modified Ziegler-Natta procatalyst;
- wherein the modified Ziegler-Natta procatalyst is free of a trialkylaluminum;
- and wherein the activator is selected from the group consisting of:
- (i) a (A) hydrocarbylaluminoxane;
- (ii) an organoborate or an organoboron;
- and (iii) both (i) and (ii).
Dependencies are inferred from the claim text.