Chisso Corporation

Atsushi Suzuki

Masato Harada

Sadahiko Yamada

Jun Masuda

Hiroshi Shimizu

Akihiro Sato

Kazutsune Kikuta

Atsuyuki Kachi

Kiyoto Fukuda

Tadamitsu Hamazaki

Toshiaki Yoshida

Yoshikatsu Ishigaki

Tadamitsu Hamasaki

A method for producing .alpha.-olefin polymers is provided. This method provides products having superior properties such as higher bulk density and uniform particle form which is close to sphere, with such an extremely higher catalyst efficiency that ash-removal step can be omitted without fear of coloring. The characteristic point of this method is in the improvement of conventional catalyst obtained by reacting a trivalent metal halide with a divalent metal hydroxide, oxide or carbonate or a double salt containing foregoing compounds or a hydrate of a compound containing a divalent metal to form a solid product (I), reacting an electron donor with said product (I), reacting the resulting product with a compound of transition metal of the 4th a or the 5th a group to form a final solid product and combining an organoaluminum compound with said final product,

Method for producing .alpha.-olefin polymers

A process for producing polyethylene having a superior form and a narrower molecular weight distribution with a higher polymer yield is provided. In this process, a combination of a solid product (II) with an organoaluminum compound is used as a polymerization catalyst. This solid product is prepared by first reacting a trivalent metal halide with a divalent metal compound to form a solid product (I), which is then reacted with a halogen-containing transition metal compound and a halogen-free transition metal compound in the presence of a polysiloxane.

Process for producing polyethylene

A method for producing .alpha.-olefin polymers or copolymers by the use of an improved catalyst consisting of a combination of an organoaluminum compound with a specified solid product (III) which is produced by reacting a trivalent metal halide with a divalent metal hydroxide, oxide, carbonate, or a composite compound containing the foregoing compound(s) or a hydrate of a compound containing a divalent metal; reacting the resultant solid product (I) with a transition metal compound in the presence of an electron donor to produce a solid product (II); and further reacting said solid product (II) with a halogen-containing transition metal compound and a halogen-free transition metal compound.

Method for producing olefin polymers

A method for producing .alpha.-olefin polymers or copolymers by the use of an improved catalyst having a specific solid product combined with an organoaluminum compound is provided. The specific solid product (III) is prepared by

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Ichiharashi, Japan

Atsushi Suzuki