α-olefin polymerization catalyst system and its use...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...

Reexamination Certificate

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C502S120000, C525S053000

Reexamination Certificate

active

06872682

ABSTRACT:
A catalyst system for the polymerization of α-olefins prepared by a process which includes catalyst activation whereby a solid transitional metal compound is contacted with an organoaluminum compound and catalyst prepolymerization whereby a premonomer is prepolymerized in the presence of the activated catalyst. High activity, low fines polymerization can be achieved if in the first step of catalyst activation a first reaction mixture is prepared by contacting the solid transitional metal compound with a first organoaluminum compound in the presence of an oil and in the second step, the first reaction mixture is contacted with a second organoaluminum compound to give a second reaction mixture, the second organoaluminum compound being the same as or different from the first organoaluminum compound.

REFERENCES:
patent: 5455289 (1995-10-01), Caselli
patent: 5578537 (1996-11-01), Herrmann et al.
patent: 5614455 (1997-03-01), Herrmann et al.
patent: 5641721 (1997-06-01), Pentti et al.
patent: 5677375 (1997-10-01), Rifi et al.
patent: 5756575 (1998-05-01), Kawasaki et al.
patent: 5869563 (1999-02-01), Kawasaki et al.
patent: 6191223 (2001-02-01), Dolle et al.
patent: 6429250 (2002-08-01), Rohrmann
patent: 6576710 (2003-06-01), Huovinen et al.
patent: 1183788 (1998-06-01), None
patent: 573862 (1993-05-01), None
patent: 0573862 (1993-05-01), None
patent: 588277 (1994-03-01), None
patent: 0588277 (1994-03-01), None
patent: 0887379 (1998-12-01), None

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