Ziegler-Natta catalyst and preparation thereof
AssigneeBorealis AG
InventorsVictor Sumerin, Georgy Kipiani
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Abstract
This invention relates to a solid MgCb-based Natta catalyst component comprising a C2 to C6 alkyl tetrahydrofurfuryl ether as internal electron donor for producing olefin polymers and preparation of said catalyst component. Further, the invention relates to a Ziegler-Natta catalyst comprising said solid catalyst component, Group 13 metal compound as co-catalyst and optionally external additives. The invention further relates to the use of said catalyst component in producing olefin polymers, especially ethylene copolymers.
Claims32
A method for producing a solid MgCl2 supported catalyst component, the method comprising the steps of:
- a) providing solid carrier particles of MgCl2*mROH adduct, wherein R is a linear or branched alkyl group with 1 to 12 C atoms, and m is 0 to 6;
- b) pre-treating the solid carrier particles of step a) with a compound comprising a Group 13 metal;
- c) treating pre-treated solid carrier particles of step b) with a compound comprising a transition metal of Group 4 to 6;
- and
- d) recovering the solid MgCl2 supported catalyst component from step c),
- wherein the solid carrier particles are contacted with an internal organic compound of formula (I) before treating solid carrier particles in step c)
- wherein in formula (I):
- R1 is a linear or branched C2to C6-alkyl group.
A solid MgCl2 supported catalyst component comprising Ti, Mg, Al, Cl, and an internal electron donor of formula (I):
- wherein in the formula (I), R1 is a linear or branched C2 to C6-alkyl group;
- and
- wherein the solid catalyst component has:
- a Mg/Ti mol/mol ratio of 1 to 10,
- a Mg/Al ratio of >10 mol/mol, and
- a Cl/Ti mol/mol ratio of 4 to 40.
Dependencies are inferred from the claim text.