Mitsui Chemicals, Inc.

Hidetsugu Tanaka

Terunori Fujita

Shigekazu Matsui

Kazutaka Tsuru

Norio Kashiwa

Yasunori Yoshida

Makoto Mitani

Junji Saito

Tomoaki Matsugi

Takashi Nakano

Shinichi Kojoh

Naoto Matsukawa

Seiichi Ishii

Junichi Mohri

Masatoshi Nitabaru

Yasuhiko Suzuki

Yukihiro Takagi

Makato Mitani

Olefin polymer with narrow molecular weight distribution and specific molecular weight, olefin polymer having functional group introduced at terminal, tapered polymer containing segment wherein monomer composition continuously changes in the polymer chain, olefin polymer having different segments bonded to each other, and process for preparing these polymers. The olefin polymers are polymers of Ccarbon atom olefins and have a number-average molecular weight of &#x2267;500 and Mw/Mn of &#x2266;1.5. In syntheses, an olefin of 2-20 carbon atoms is polymerized in the presence of a catalyst comprising a transition metal compound represented by the formula LMXwherein M is a transition metal atom of Group 3-11, m is 1-5, n is a number satisfying a valence of M, L is a ligand&#x2014;coordinated to the central metal M&#x2014;which contains a heteroatom having no direct bond to the central metal, and X is e.g. halogen or a hydrocarbon.

Olefin polymer and process for preparing the same

The present invention provides an olefin polymer having a narrow molecular weight distribution and a specific molecular weight, an olefin polymer having a functional group introduced at the terminal, a tapered polymer containing a segment wherein monomer composition continuously changes in the polymer chain, an olefin polymer having different segments which are bonded to each other, and a process for preparing these polymers. The olefin polymers of the invention are polymers of olefins of 2 to 20 carbon atoms and have a number-average molecular weight of not less than 500 and Mw/Mn of not more than 1.5. In the process for preparing an olefin polymer, an olefin of 2 to 20 carbon atoms is polymerized in the presence of an olefin polymerization catalyst comprising a transition metal compound represented by, for example, the following formula (I):LMX&#x2003;&#x2003;(I)wherein M is a transition metal atom of Group 3 to Group 11 of the periodic table, m is 1 to 5, n is a number satisfying a valence of M, L is a ligand coordinated to the central metal M and is a ligand containing a heteroatom having no direct bond to the central metal, and X is a halogen atom, a hydrocarbon group or the like.

Olefin polymer and production processes thereof

The present invention is intended to provide an olefin polymerization catalyst comprising a novel transition metal compound and having an excellent olefin polymerization activity and to provide a process for olefin polymerization.

Catalyst for olefin polymerization and method of polymerizing olefin

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Sodegaura, Japan

Hidetsugu Tanaka