Polymerization of olefins
Mixtures of different polyolefins may be made by direct, preferably simultaneous, polymerization of one or more polymerizable olefins using two or more transition metal containing active polymerization catalyst systems, at least one of which contains cobalt or iron complexed with selected ligands. The polyolefin products may have polymers that vary in molecular weight, molecular weight distribution, crystallinity, or other factors, and are useful as molding resins and for films.
1. A process for the polymerization of olefins, comprising, contacting under polymerizing conditions:
(a) a first active polymerization catalyst for said olefins which is a Fe or Co complex of a ligand of the formula:
wherein:
R 1 , R 2 and R 3 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl, or an inert functional group;
R 4 and R 5 are each independently hydrogen, hydrocarbyl, an inert functional group or substituted hydrocarbyl;
R 6 and R 7 are aryl or substituted aryl; and
provided that a polymer produced by said first active polymerization catalyst has a degree of polymerization of about 40 or more;
(b) a second active polymerization catalyst for said olefins which contains one or more transition metals;
(c) at least one first olefin capable of being polymerized by said first active polymerization catalyst; and
(d) at least one second olefin capable of being polymerized by said second active polymerization catalyst,
and provided that said polymerization with said first active polymerization catalyst and said polymerization with said second polymerization catalyst are carried out simultaneously.
2. The process as recited in claim 1 , wherein said second active polymerization catalyst is a Ziegler-Natta or a metallocene type polymerization catalyst.
3. The process as recited in claim 1 , wherein said first olefin and said second olefin are both ethylene.
4. The process as recited in claim 1 , wherein said first olefin is ethylene.
5. The process as recited in claim 1 , wherein said first olefin and said second olefin is each independently one or both of ethylene or propylene.
6. The process as recited in claim 1 , wherein said first olefin and said second olefin are the same.
7. The process as recited in claim 2 , wherein said first olefin is ethylene.
8. The process as recited in claim 2 , wherein said first olefin and said second olefin is each independently one or both of ethylene or propylene.
9. A process for the polymerization of olefins, comprising, contacting under polymerizing conditions:
(a) a first active polymerization catalyst for said olefins which is a Fe or Co complex of a ligand of the formula:
wherein:
R 1 , R 2 and R 3 are each independently hydrogen, hydrocarbyl, substituted hydrocarbyl, or an inert functional group;
R 4 and R 5 are each independently hydrogen, hydrocarbyl, an inert functional group or substituted hydrocarbyl;
R 6 and R 7 are aryl or substituted aryl; and
provided that a polymer produced by said first active polymerization catalyst has a degree of polymerization of about 40 or more;
(b) a second active polymerization catalyst for said olefins which contains one or more transition metals;
(c) at least one first olefin capable of being polymerized by said first active polymerization catalyst; and
(d) at least one second olefin capable of being polymerized by said second active polymerization catalyst;
and provided that said process produces a polymer blend.
10. The process as recited in claim 9 , wherein said second active polymerization catalyst is a Ziegler-Natta or a metallocene type polymerization catalyst.
11. The process as recited in claim 9 , wherein said first olefin and said second olefin are both ethylene.
12. The process as recited in claim 9 , wherein said first olefin is ethylene.
13. The process as recited in claim 9 , wherein said first olefin and said second olefin is each independently one or both of ethylene or propylene.
14. The process as recited in claim 9 , wherein said first olefin and said second olefin are the same.
15. The process as recited in claim 10 , wherein said first olefin is ethylene.
16. The process as recited in claim 10 , wherein said first olefin and said second olefin is each independently one or both of ethylene or propylene.