Idemitsu Petrochemical Co., Ltd.

Kenji Nakacho

Hideo Funabashi

Yutaka Takakura

Toshiya Abiko

Isamu Yamamoto

Tsutomu Akimaru

Tsuyoshi Ohta

Norio Shimakura

Process for producing polyolefin

A process for producing a polyolefin is here disclosed which comprises the step of polymerizing olefins in the presence of a catalyst comprising (A) a compound of a transition metal in the group IV of the Periodic Table, (B) an aluminoxane, (C) a compound having 2 or more aromatic rings in its molecule represented by the formula

A process for the preparation of an ethylenic polymer composition having excellent physical properties such as high impact properties, environmental stress cracking resistance, pinch-off fusing characteristics and having an intrinsic viscosity ranging from 3.2 to 4.5 dl/g and a density ranging from 0.943 g/cm.sup.3 to 0.958 g/cm.sup.3.

Process for preparing ethylenic polymer composition

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Ichihara, Japan

Kenji Nakacho