Prepolymerized catalyst composition, a process for the preparati

Details Prepolymerized catalyst composition, a process for the preparati Prepolymerized catalyst composition, a process for the preparati

1997-03-27

1998-03-31

Nagumo, Mark

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5261253, 5261243, 526903, 526904, 526351, 526352, 502108, 502109, C08F 464

Patent

active

057339899

ABSTRACT:
The present invention concerns prepolymerized catalyst composition for polymerization of .alpha.-olefins, a process for the preparation thereof and a process for polymerization of .alpha.-olefins. According to the polymerization process a procatalyst composition containing a transition metal is prepolymerized with a monomer in order to produce a prepolymerized Ziegler-Natta type catalyst composition and said catalyst composition is contacted with an alpha-olefin monomer, in particular with ethylene or propylene, for preparing a polymer. According to the invention the procatalyst composition is preferably prepolymerized in a medium which is inert to the catalyst components, the viscosity of the medium being so high that the catalyst does not substantially settle in this medium. Because the catalyst composition according to the invention does not have to be dried before being fed into the medium, its activity is high before and during polymerization.

REFERENCES:
patent: 3061601 (1962-10-01), Watt
patent: 3817970 (1974-06-01), Mueller-Tamm
patent: 3849334 (1974-11-01), Frielingsdorf et al.
patent: 4200715 (1980-04-01), Lynch et al.
patent: 4235747 (1980-11-01), Leung
patent: 4579836 (1986-04-01), Arzoumanidis et al.
Boor, Jr., John, Ziegler-Natta, "Catalysts and Polymerizations", Academic Press, New York,1979, pp. 602-609.
English Language translation of SE 367,552.

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