Ziegler-Natta catalyst systems and polymers formed therefrom
Processes of forming catalyst systems, catalyst systems and polymers formed therefrom are described herein. The processes generally include providing a first compound including a magnesium dialkoxide, contacting the first compound with a second compound to form a solution of reaction product “A”, wherein the second compound is generally represented by the formula: Ti(OR 1 ) 4 ; wherein R 1 is selected from C 1 to C 10 linear to branched alkyls, contacting the solution of reaction product “A” with a first metal halide to form a solid reaction product “B”, contacting solid reaction product “B” with a second metal halide, to form reaction product “C” and contacting reaction product “C” with reducing agent to form a catalyst component.
1. A process of forming a catalyst system comprising:
providing a magnesium dialkoxide as a first compound;
contacting the magnesium dialkoxide with a third compound in the presence of a second compound to form a solution of reaction product “A”, wherein the second compound is TNBT or Ti(O-2-ethylhexyl) 4 , and the third compound is generally represented by the formula:
Al(OR 2 ) 3
wherein R 2 is selected from C 1 to C 10 linear or branched alkyls
contacting the solution of reaction product “A” with a first metal halide to form a solid reaction product “B”;
contacting solid reaction product “B” with a second metal halide to form reaction product “C”; and
contacting reaction product “C” with a reducing agent to form a catalyst component, wherein the reducing agent is selected from the group consisting of trimethyl aluminum, triisobutyl aluminum, triethyl aluminum, n-octyl aluminum and n-hexyl aluminum.
2. The process of claim 1 , wherein the magnesium dialkoxide is represented by the formula Mg(OEt) 2 .
3. The process of claim 1 , wherein the magnesium dialkoxide contacts the second compound in an equivalent of from about 0.75 to about 1.75.
4. The process of claim 1 , wherein the third compound comprises aluminum 2-ethylhexanoxide.
5. The process of claim 1 , wherein the second compound and the third compound contact one another prior to contact with the magnesium dialkoxide.
6. The process of claim 1 , wherein the first metal halide and the second metal halide each comprise TiCl 4 .
7. A Ziegler-Natta catalyst formed from the process of claim 1 .
8. The catalyst of claim 7 further comprising a particle size of at least about 5 microns.
9. The catalyst of claim 7 , wherein the catalyst exhibits a particle size that is greater than a particle size of the catalyst absent contact with the third compound.
10. A polymerization process comprising:
introducing an olefin monomer into a reaction zone;
contacting the olefin monomer with the catalyst of claim 1 to form a polyolefin; and
withdrawing the polyolefin from the reaction zone.
11. The process of claim 1 , wherein the reaction product “A” is formed from the second compound and the magnesium dialkoxide in a single process step.