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US 9,255,160 B2Granted
Multi-metallic ziegler-natta procatalysts and cataysts prepared therefrom for olefin polymerizations
AssigneeDow Global Technologies LLC
InventorsSylvie Desjardins, Mehmet Demirors, Ellen Donkers, Philip P. Fontaine, Cristina Serrat
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Abstract
Novel catalyst compositions comprising three or more transition metals are effective in increasing catalyst efficiency, reducing polydispersity, and increasing uniformity in molecular weight distribution when used in olefin, and particularly, linear low density polyethylene (LLDPE), polymerizations. The resulting polymers may be used to form differentiated products including, for example, films that may exhibit improved optical and mechanical properties.
Claims10
A process to prepare a multi-metallic procatalyst comprising
- (a) reacting a hydrocarbon-soluble organomagnesium compound or complex thereof and an active non-metallic or metallic halide to form a halogenated magnesium support;
- (b) contacting the magnesium halide support with a conditioning compound containing an element selected from the group consisting of boron, aluminum, gallium, indium and tellurium under conditions sufficient to form a conditioned magnesium halide support;
- (c) contacting the conditioned magnesium halide support and a compound containing, as a first metal, titanium, to form a supported titanium compound;
- (d) contacting the supported titanium compound and a second metal and a third metal independently selected from the group consisting of zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten, provided that the second metal and the third metal are not the same;
- and further provided that the molar ratio of the magnesium to a combination of the titanium and the second and third metals ranges from 30:1 to 5:1;
- under conditions sufficient to form a multi-metallic procatalyst.
3 more elements
Dependencies are inferred from the claim text.