Modified spray-dried ziegler-natta (pro)catalyst systems
AssigneeUnivation Technologies, LLC
InventorsWesley R. Mariott, C. Dale Lester, Phuong A. Cao, Michael D Awe, Nitin Borse
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Abstract
A modified spray-dried Ziegler-Natta (pro)catalyst system comprising a Ziegler-Natta (pro)catalyst, a carrier material, and a tetrahydrofuran/ethanol modifier; polyolefins; methods of making and using same; and articles containing same.
Claims12
A modified spray-dried Ziegler-Natta procatalyst system comprising a product of spray-drying a slurry of (A+) a modified Ziegler-Natta procatalyst system and (B) a hydrophobic pre-treated fumed silica;
- wherein the (A+) modified Ziegler-Natta procatalyst system comprises a complex of TiCl3 and MgCl2 and an effective amount of (C) a tetrahydrofuran/ethanol modifier, wherein the (C) tetrahydrofuran/ethanol modifier has a THF/EtOH weight/weight ratio of from 20:80 to 80:20.
A method of making a polyethylene composition, the method comprising contacting ethylene (monomer) and optionally zero, one, or more (C3-C20)alpha-olefin (comonomer(s)) with the modified spray-dried Ziegler-Natta catalyst system of claim 9 to give a polyethylene composition comprising a polyethylene homopolymer or ethylene/(C3-C20)alpha-olefin copolymer, respectively, and the modified spray-dried Ziegler-Natta catalyst system, or a by-product thereof.
Dependencies are inferred from the claim text.