Catalyst composition with phosphorus-based donor and method
View Patent ↗Disclosed are catalyst compositions having an external electron donor which includes one or more of the following compositions: a phosphite, a phosphonite, a pyrophosphite, and/or a diphosphazane. Ziegler-Natta catalyst compositions containing the present external electron donor exhibit strong activity and produce propylene-based olefins with high isotacticity and high melt flow rate.
1. A catalyst composition comprising:
a procatalyst composition comprising a magnesium moiety;
a cocatalyst; and
a phosphorus-based external electron donor having the structure (IX)
wherein R 1 and R 2 are the same or different and each of R 1 -R 2 is selected from the group consisting of a substituted hydrocarbyl group having 1 to 20 carbon atoms, an unsubstituted hydrocarbyl group having 1 to 20 carbon atoms, and combinations thereof; and
X is an amino group selected from the group consisting of —NH 2 , —NHR 3 , and —NR 3 R 4 , wherein R 3 and R 4 are the same or different and each of R 3 and R 4 is selected from the group consisting of a substituted hydrocarbyl group having 1 to 20 carbon atoms and an unsubstituted hydrocarbonyl group having 1 to 20 carbon atoms.
2. The catalyst composition of claim 1 wherein the procatalyst composition comprises a component selected from the group consisting of a titanium moiety, an internal electron donor, and combinations thereof.
3. The catalyst composition of claim 2 wherein the procatalyst composition comprises an internal electron donor selected from the group consisting of an aromatic acid ester, a diether, a silyl ester, and combinations thereof.
4. The catalyst composition of claim 3 wherein the internal electron donor is an aromatic acid ester.
5. The catalyst composition of claim 1 wherein R 1 and R 2 form a P-ring structure.
6. The catalyst composition of claim 1 wherein R 1 and X form a first P-ring structure and R 2 and X form a second P-ring structure.
7. The catalyst composition of claim 1 wherein at least one of R 3 and R 4 is a substituted hydrocarbyl group comprising one or more heteroatoms.
8. The catalyst composition of claim 1 wherein R 3 and R 4 are joined together to form a ring structure.
9. The catalyst composition of claim 1 wherein R 3 forms a ring structure with R 1 .
10. The catalyst composition of claim 9 wherein R 4 forms a ring structure with R 2 .
11. The catalyst composition of claim 1 wherein structure (IX) is a phosphoramidite.
12. The catalyst composition of claim 1 wherein structure (IX) has the structure
13. The catalyst composition of claim 1 wherein structure (IX) has the structure
14. The catalyst composition of claim 1 wherein the external electron donor further comprises a member selected from the group consisting of a phosphite, an alkoxysilane, an activity limiting agent, and combinations thereof.
15. The catalyst composition of claim 1 wherein X is —NR 3 R 4 .
16. The catalyst composition of claim 1 wherein X is —NR 3 R 4 and each of R 3 and R 4 is an unsubstituted hydrocarbonyl group having 1 to 20 carbon atoms.