Method of making a homogeneous-heterogenous catalyst system for

Details Method of making a homogeneous-heterogenous catalyst system for Method of making a homogeneous-heterogenous catalyst system for

1993-01-27

1995-03-07

Pal, Asok

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

Catalyst or precursor therefor

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

502103, 502114, 502115, 502117, 502121, 502125, 502127, 502134, B01J 3100

Patent

active

053958101

ABSTRACT:
This invention concerns a making 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 for making a catalyst for 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.
patent: 5104838 (1992-04-01), Fujita et al.
Zambelli et al., "Isotactic Polymerization of Propene: Homogeneous Catalysts Based on Group 4 Metallocenes without Methylalumoxane", Macromolecules, vol. 22, pp. 2186-2189 (1989).
Fujita et al., "Production of alpha-olefin Polymer", Patent Abstracts of Japan, vol. 15, No. 231, App. No. 01-207562, (1991).

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