Homogeneous-heterogeneous catalyst system for polyolefins

Details Homogeneous-heterogeneous catalyst system for polyolefins Homogeneous-heterogeneous catalyst system for polyolefins

C - Chemistry, Metallurgy

08

F

C08F 4/72 (2006.01) C08F 2/02 (2006.01) C08F 10/00 (2006.01) C08F 4/639 (2006.01) C08F 4/6392 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2077744

This invention concerns a catalyst system comprising at least one homogeneous catalyst and at least one heterogeneous catalyst, specifically, a metallocene catalyst and a conventional Ziegler- Natta catalyst, respectively. This invention is useful in the polymerization of any polymer in which separate polymerizations with a homogeneous catalyst and with a heterogeneous catalyst are possible, but preferably, polymerization of olefins, more preferably, a-olefins, and, most preferably, propylene. This invention provides a catalyst system which facilitates use of a homogeneous catalyst but eliminates the disadvantages of such a system. This invention produces a polymer with molecular weight distribution (MWD) as broad or broader than the MWD of the heterogeneous catalyst alone. Hydrogen can be used to control molecular weight distribution of a polymer produced with this invention.

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