Mitsubishi Chemical Industries Limited

Seiji Onogi

Masao Miyake

Toshiharu Arai

Hirohisa Yoshiura

Yoshikane Furuya

Tetsushi Kamizono

In a process for preparing a polyolefin without separation of catalyst residues by polymerizing an olefin in the pres ence of a Ziegler catalyst having high catalytic activity, in an inert gas sealing system; an improvement comprises separating the polyolefin containing the catalyst residue from the polymerization mixture, and contacting the polyolefin containing the catalyst residue with a weak reactive gas of oxygen and/or steam diluted with an inert gas.

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Kurashiki, Japan

Seiji Onogi