Production of high melt flow propylene-based polymer and product from same
Disclosed are catalyst compositions having an internal electron donor which includes a 3,6-di-substituted-1,2-phenylene aromatic diester. Ziegler-Natta catalyst compositions containing the present catalyst compositions exhibit very high hydrogen response, high activity, high selectivity and produce propylene-based olefins with high melt flow rate.
1. A catalyst composition comprising:
a magnesium moiety and a substituted-1,2-phenylene dibenzoate having structure (I),
wherein:
R 1 -R 14 are the same or different;
R 1 and R 4 are independently selected from the group consisting of C1 to C8 alkyl and C2 to C8 alkenyl;
one of R 2 and R 3 is H and the other is a C1 to C20 hydrocarbyl, the hydrocarbyl comprising a cycloalkyl moiety, a cycloalkenyl moiety, or a cycloalkadienyl moiety; and
each of R 5 -R 14 is selected from the group consisting of H, halogen, C1 to C20 hydrocarbyl, and C1 to C20 hydrocarbyloxy.
2. The procatalyst composition of claim 1 further comprising a magnesium moiety, a titanium moiety.
3. The procatalyst composition of claim 2 , wherein the magnesium moiety comprises a magnesium halide.
4. The procatalyst composition of claim 1 , wherein R 1 and R 4 are the same.
5. The procatalyst composition of claim 1 , wherein R 1 and R 4 are linear hydrocarbyl.
6. The procatalyst composition of claim 1 , wherein R 1 and R 4 are methyl.
7. The procatalyst composition of claim 1 , wherein at least one of R 2 or R 3 is isopropyl, tert-butyl, 2,3,3-trimethylbutan-2-yl, cyclopentyl, or cyclohexyl.
8. A catalyst composition comprising the procatalyst composition of claim 1 and a cocatalyst.
9. The catalyst composition of claim 8 , wherein the cocatalyst comprises an alkyl aluminum compound.
10. The catalyst composition of claim 8 further comprising an external electron donor.
11. The catalyst composition of claim 10 , wherein the external electron donor comprises an alkoxysilane.
12. The catalyst composition of claim 10 , wherein the external electron donor comprises dicyclopentyldimethoxysilane, di-tert-butyldimethoxysilane, methylcyclohexyldimethoxysilane, methylcyclohexyldiethoxysilane, ethylcyclohexyldimethoxysilane, diphenyldimethoxysilane, diisopropyldimethoxysilane, di-n-propyldimethoxysilane, diisobutyldimethoxysilane, diisobutyldiethoxysilane, isobutylisopropyldimethoxysilane, di-n-butyldimethoxysilane, cyclopentyltrimethoxysilane, isopropyltrimethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, diethylaminotriethoxysilane, cyclopentylpyrrolidinodimethoxysilane, bis(pyrrolidino)dimethoxysilane, bis(perhydroisoquinolino)dimethoxysilane, or dimethyldimethoxysilane.
13. The catalyst composition of claim 12 , wherein the external electron donor comprises dicyclopentyldimethoxysilane, methylcyclohexyldimethoxysilane, or n-propyltrimethoxysilane.
14. The catalyst composition of claim 8 further containing an activity limiting agent.