Imino-amide catalyst compositions for the polymerization of...

C - Chemistry – Metallurgy – 08 – F

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C08F 10/00 (2006.01) C07F 7/00 (2006.01) C08F 4/64 (2006.01) C08F 4/639 (2006.01) C08F 4/659 (2006.01) C08F 110/02 (2006.01) C08F 210/16 (2006.01)

Patent

CA 2469111

The present invention provides a catalyst precursor and catalyst system comprising the precursor, an embodiment of the precursor is selected from the following structures: (I), (II), (III) and (IV) wherein T is a bridging group; M is selected from Groups 3 to 7 atoms, and the Lanthanide series of atoms the Periodic Table of the Elements; 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.

La présente invention concerne un précurseur de catalyseur et un système de catalyseur comprenant ce précurseur. Pour un mode de réalisation, le précurseur est choisi parmi les structures (I), (II), (III) et (IV) suivantes. Dans ces formules, T est un groupe passerelle. M désigne l'un des atomes des Groupes 3 à 7 et de la série Lanthanides de la Table Périodique des Eléments. Z est un ligand de coordination. Chaque L est un ligand anionique monovalent, bivalent ou trivalent. X et y sont chacun indépendamment azote, oxygène, soufre ou phosphore. R est un substituant non aggloméré qui présente un empêchement stérique relativement faible par rapport à X. enfin, R' est un substituant aggloméré présentant un empêchement stérique par rapport à Y.

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