Ube Industries, Inc.

Yoshihira Hosoyama

Michinori Suzuki

Nobuharu Hisano

Masato Murakami

Nobuhiro Tsujimoto

Yasumasa Iwamoto

Sakae Yuasa

Satoshi Bandai

Koji Maeda

The present invention provides a process for the production of a conjugated diene polymer having a controlled microstructure at a high polymerization activity in the presence of a metallocene type complex of compound of transition metal of the group V of the Periodic Table. A novel catalyst is provided comprising (A) a metallocene type complex of a transition metal of the group V of the Periodic Table, (B) an ionic compound of a non-coordinating anion and a cation, (C) an organic metal compound of the groups I to III and (D) water, wherein the molar ratio of (C)/(D) is from 0.66 to 5. A novel process for the production of a conjugated diene polymer is also provided, which comprises the polymerization of a conjugated diene compound in the presence of a catalyst comprising (A) a metallocene type complex of a transition metal of the group V of the Periodic Table, (B) an ionic compound of a non-coordinating anion and a cation, (C) an organic metal compound of the groups I to III and (D) water, wherein the molar ratio of (C)/(D) is from 0.66 to 5.

Conjugated diene compound polymerization catalyst process for the preparation of conjugated diene polymer in the presence thereof and polybutadiene thus prepared

Growing community of inventors

Chiba, Japan

Yoshihira Hosoyama