Olefin polymerization catalyst
A process for preparing a solid pre-catalyst component for use in olefinic polymerization includes dissolving a magnesium chloride in an alcohol and optionally adding water to form a first solution having a water content of about 0.5 mmol water per mol MgCl 2 to about 100 mmol water per mol MgCl 2 ; contacting the first solution with a first titanium compound to form the solid pre-catalyst component; and treating the solid pre-catalyst component with a hydrocarbon or halogenated hydrocarbon solvent, optionally containing a second titanium compound.
1. A process for preparing a solid pre-catalyst component for use in olefinic polymerization, the process comprising:
dissolving anhydrous magnesium chloride in an alcohol to form a complex of formula [Mg(alcohol) n ]Cl 2 , where n is 2, 3, 4, 5, or 6; and
adding water to form a first solution having a water content of about 0.5 mmol water per mol MgCl 2 to about 100 mmol water per mol MgCl 2 ;
contacting the first solution with a first titanium compound to form the solid pre-catalyst component; and
treating the solid pre-catalyst component with a hydrocarbon or halogenated hydrocarbon solvent, optionally containing a second titanium compound.
2. The process of claim 1 further comprising adding to the first solution a hydrocarbon, a siloxane, an aluminum alkoxide, or a mixture of any two or more thereof to form a second solution.
3. The process of claim 1 further comprising adding to the first solution a hydrocarbon, a siloxane, and an aluminum alkoxide to form a second solution.
4. The process of claim 1 with the proviso that no aluminum alkoxide compounds are present during the dissolving the magnesium chloride in the alcohol.
5. The process of claim 1 further comprising contacting the first solution with an internal electron donor concurrently with, or subsequent to, dissolving the magnesium chloride in the alcohol.
6. The process of claim 5 , wherein contacting the first solution with the internal electron donor and contacting the first solution with the first titanium compound in the second solvent to form the solid pre-catalyst component occur simultaneously.
7. The process of claim 5 , wherein the internal donor is an organic monoester having 2 to about 30 carbon atoms.
8. The process of claim 2 , wherein the aluminum alkoxide compound is added and is selected from the group consisting of aluminum methoxide, aluminum ethoxide, aluminum isopropoxide, and mixtures of any two or more thereof.
9. The process of claim 1 , wherein the first titanium compound is a titanium halide, a titanium alkoxide, or a titanium alkoxychloride.
10. The process of claim 1 , wherein the second titanium compound is a titanium halide.
11. The process of claim 1 , wherein the moisture level of the magnesium chloride solution is from about 5 mmolH 2 O/mol MgCl 2 to 50 mmol H 2 O/mol MgCl 2 .
12. The process of claim 11 , wherein the moisture level of the magnesium chloride solution is from about 25 mmolH 2 O/mol MgCl 2 to 50 mmol H 2 O/mol MgCl 2 .
13. The process of claim 2 , wherein the hydrocarbon solvent is added and is an aromatic or aliphatic hydrocarbon.
14. The process of claim 13 , wherein the hydrocarbon solvent is selected from the group consisting of toluene, ethyl benzene, pentane, hexane, and heptane.
15. The process according to claim 2 , wherein the siloxane is added.
16. The solid pre-catalyst component prepared by the process of claim 1 .
17. A process of polymerizing or copolymerizing an olefin, the process comprising contacting the solid pre-catalyst component of claim 16 with an organoaluminum activating agent and the olefin.
18. The process of claim 17 , wherein the organoaluminum activating agent is triethylaluminum, triisobutylaluminum, tri-n-octylaluminum, or a mixture of any two or more thereof.
19. The process of claim 18 , wherein the olefin is ethylene, propylene, 1-butylene, 1-methyl-1-pentene, 1-hexene, and 1-octene.