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AssigneeChisso Corporation
InventorsAkihiro Sato, Kazutsune Kikuta, Kenji Matsuda, Toshihiro Uwai, Tohru Hanari
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A process for producing .alpha.-olefin polymers is provided which comprises: reacting an organoaluminum compound (A.sub.1) with an electron donor (B.sub.1) to obtain a reaction product (I); reacting (I) with TiCl.sub.4 to obtain a solid product (II); reacting (II) with an electron donor (B.sub.2) and an electron acceptor to obtain a solid product (III); combining (III) with an organoaluminum compound (A.sub.2) and a reaction product (G) of an organoaluminum (A.sub.3) with an electron donor (B.sub.3) ((III), (A.sub.2) and (G) being referred to as catalyst components), and in this combination, subjecting a part or the whole of the catalyst components to polymerization treatment with an .alpha.-olefin at least in the presence of (III) and said (A.sub.2) to obtain a preliminarily activated catalyst; and polymerizing an .alpha.-olefin in the presence of the catalyst. According to this process, even in the case of gas phase polymerization, the resulting polymer has a uniform particle size; the catalyst employed has not only a high stability but also a high activity whereby the advantages of gas phase polymerization can be fully exhibited; and further it is possible to easily control the stereoregularity of polymer.
A process for producing .alpha.-olefin polymers which comprises:
A process for producing .alpha.-olefin polymers which comprises:
Dependencies are inferred from the claim text.