A ziegler-natta catalyst system and a process of polymerisation therefrom
AssigneeReliance Industries Limited
InventorsVirendrakumar Gupta, Parthiv Mukundkumar Trivedi
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Abstract
The present disclosure relates to a Ziegler-Natta catalyst system comprising a pro-catalyst, a co-catalyst and a selectivity control agent. The pro-catalyst comprises a magnesium compound, a titanium compound and a multi-dentate internal donor, wherein the internal donor is tetraethyl 3,3,3′,3′-tetramethyl-2,2′,3,3′-tetrahydro-1,1′-spirobiindane-5,5′,6,6′-tetracarbonate. The present disclosure further relates to a process for polymerization of an olefin using the Ziegler-Natta catalyst system. The Ziegler-Natta catalyst system of the present disclosure shows very high hydrogen response and thus can be used to produce low to high molecular weight polyolefin.
Claims20
A Ziegler-Natta catalyst system comprising:
- 2 wt % to 10 wt % of a pro-catalyst with respect to the total weight of the catalyst system;
- wherein said pro-catalyst comprises;
- a magnesium compound;
- a titanium compound;
- and
- a multi-dentate internal donor;
- 83 wt % to 95 wt % of a co-catalyst with respect to the total weight of the catalyst system;
- and
- 1 wt % to 8 wt % of a selectivity control agent with respect to the total weight of the catalyst system.
A process for preparing a Ziegler-Natta catalyst system, said process comprises a step of adding a pro-catalyst containing multi-dentate internal donor to at least one co-catalyst and at least one selectivity control agent to obtain the Ziegler-Natta catalyst system.
A process for polymerization of an olefin using a Ziegler-Natta catalyst system;
- said process comprising the following steps:
- adding a Ziegler-Natta catalyst system comprising a pro-catalyst, a co-catalyst and a selectivity control agent;
- and a hydrocarbon fluid medium
- in a reactor under inert atmosphere to obtain a first slurry;
- introducing an olefin into the reactor containing said first slurry at a first predetermined pressure to obtain a second slurry;
- subjecting said second slurry to polymerization at a predetermined temperature and at a second predetermined pressure followed by adding a chain terminating agent to obtain a polyolefin.
Dependencies are inferred from the claim text.