Back to results
US 7,126,031 B2Granted
Bridged bi-aromatic ligands, catalysts, processes for polymerizing and polymers therefrom
AssigneeSymyx Technologies, Inc.
InventorsThomas R. Boussie, Oliver Brümmer, Gary M. Diamond, Christopher Goh, Anne M. LaPointe, Margaret K. Leclerc, James A. W. Shoemaker
Life of this patent
Estimating the term…
Abstract
New ligands and compositions with bridged bis-aromatic ligands are disclosed that catalyze the polymerization of monomers into polymers. These catalysts with metal centers have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, propylene or styrene. The catalysts also polymerize propylene into isotactic polypropylene.
Claims10
A ligand characterized by the general formula:
- wherein each of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, and R20 is independently selected from the group consisting of hydride, halide, and optionally substituted hydrocarbyl, heteroatom-containing hydrocarbyl, alkoxy, aryloxy, silyl, boryl, phosphino, amino, alkylthio, arylthio, thioxy, seleno, and nitro;
- optionally two or more R groups can combine together into ring structures, with such ring structures having from 3 to 100 atoms in the ring not counting hydrogen atoms;
- B is a bridging group having from one to 50 atoms not counting hydrogen atoms;
- X and X′ are the same or different and are independently selected from the group consisting of oxygen, sulfur, and —PR30—, where R30 is selected from the group consisting of hydride, halide, and optionally substituted hydrocarbyl, heteroatom-containing hydrocarbyl, silyl, boryl, alkoxy, and aryloxy;
- Y and Y′ are the same or different and are independently selected from the group consisting of optionally substituted amino, phosphino, hydroxy, alkoxy, aryloxy, alkylthio, arylthio and thioxy.
2 more elements
Dependencies are inferred from the claim text.