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AssigneeSymyx Technologies, Inc.
InventorsThomas Boussie, Gary Diamond, Christopher Goh, Keith Hall, Anne LaPointe, Margarete Leclerc, Cheryl Lund, Vince Murphy
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New ligands, compositions, metal-ligand complexes and arrays with pyridyl-amine ligands are disclosed that catalyze the polymerization of monomers into polymers. Certain of these catalysts with hafnium metal centers have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, isobutylene or styrene. Certain of the catalysts are particularly effective at polymerizing propylene to high molecular weight isotactic polypropylene in a solution process at a variety of polymerization conditions.
Isotactic polypropylene produced by polymerization of propylene with the aid of a catalyst that comprises Hf or Zr in a solution polymerization process, wherein the tacticity index value of the polypropylene does not vary by more than 0.1 when the temperature of the solution process is varied from a temperature below 90° C. to a temperature above 100° C.
Isotactic polypropylene produced by polymerization of propylene with the with the aid of a catalyst that comprises Hf or Zr in a solution polymerization process, wherein the melting point of the polypropylene does not vary by more than 10° C. when the temperature of the solution process is varied from a temperature below 90° C. to a temperature above 100° C.
Isotactic polypropylene produced by polymerization of propylene with the with the aid of a catalyst that comprises Hf or Zr in a solution polymerization process, wherein the temperature of the solution process is at least 110° C. and the polypropylene has a weight average molecular weight of at least 100,000.
Dependencies are inferred from the claim text.