Imino-amide catalyst compositions for the polymerization of olefins
AssigneeUnivation Technologies, LLC
InventorRex Eugene Murray
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Abstract
The present invention provides a catalyst precursor and catalyst system comprising the precursor, an embodiment of the precursor is selected from the following structures: wherein T is a bridging group; M is selected from Groups 3 to 7 atoms; Z is a coordination ligand; each L is a monovalent, bivalent, or trivalent anionic ligand; X and Y are each independently selected from nitrogen, oxygen, sulfur, and phosphorus; R is a non-bulky substituent that has relatively low steric hindrance with respect to X; and R′ is a bulky substituent that is sterically hindering with respect to Y.
Claims20
A method of polymerizing olefins comprising combining under polymerization conditions a catalyst precursor composition and an activator with one or more olefins selected from the group consisting of ethylene, propylene, 1-butene, 1-octene, and 1-decene;
- the catalyst precursor composition represented by one or more:
- wherein T is a bridging group containing 2 or more bridging atoms;
- M is an atom selected from Groups 3 to 7 of the Periodic Table of the Elements,
- Z is a coordination ligand;
- each L is a monovalent, bivalent, or trivalent anionic ligand;
- n is an integer from 1 to 6;
- X is nitrogen or phosphorus;
- Y is a heteroatom selected from the group consisting of nitrogen, phosphorus, oxygen, and sulfur;
- R is a C1 to C30 straight chain alkyl group or a C2 to C30 branched chain alkyl group;
- and
- R′ is a bulky substituent having from 3 to 50 non-hydrogen atoms that is sterically hindering with respect to Y.
Dependencies are inferred from the claim text.