Homogeneous-heterogeneous catalyst system for polyolefins

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

1991-09-30

1993-09-07

Schofer, Joseph L.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Plural component system comprising a - group i to iv metal...

502103, 502117, 502152, 502153, 526114, 526119, C08F 402

Patent

active

052428761

ABSTRACT:
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, .alpha.-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.

REFERENCES:
patent: 4701432 (1987-10-01), Welborn, Jr.

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