Mitsui Chemicals, Inc.

Nobukazu Yamahira

Yasushi Tohi

Shigenobu Ikenaga

Takashi Yukita

Masahiro Yamashita

Hiromu Kaneyoshi

Shiro Otsuzuki

Sunil Krzysztof Moorthi

Wataru Yamada

Tomohiro Yamaguchi

Kouji Nagahashi

Junpei Tanaka

Kazunori Kamio

[Problem] To efficiently obtain an &#x3b1;-olefin polymer having a high melting point and a high molecular weight. [Solution to Problem] The process for preparing an olefin polymer of the present invention is a process for preparing an olefin polymer, comprising polymerizing at least one monomer selected from &#x3b1;-olefins of 2 or more carbon atoms, wherein the polymerization is carried out at a temperature of not lower than 40&#xb0; C. in the presence of a catalyst comprising a transition metal compound component (A) which comprises two or more kinds of transition metal compounds (a) represented by the following formula [A1] and an organometallic compound component (B) which comprises an organometallic compound (b), propylene is contained in the monomer, and the olefin polymer is an olefin polymer whose weight-average molecular weight (Mw) and number-average molecular weight (Mn), as determined by gel permeation chromatography (GPC), satisfy the relationship of 1&#x2266;(Mw/Mn)&#x2266;3, and which has a melting point (Tm), as determined by DSC, of not lower than 150&#xb0; C. and an intrinsic viscosity ([&#x3b7;]) of not less than 1.5 dl/g.

Process for preparing olefin polymer using mixed catalyst

Disclosed is a method for producing a syndiotactic propylene polymer having a syndiotactic pentad fraction (rrrr fraction) of not less than 85%, a melting point (Tm) within the range of 145-170&#xb0; C. and a limiting viscosity [&#x3b7;] within the range of 0.1-10 dl/g by a solution polymerization method using a group 4 crosslinked metallocene compound, which is not accompanied by precipitation of a polymer (excluding white turbidity). Also disclosed is a production method which enables to continuously perform such a production.

Process for production of syndiotactic propylene polymer

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Yamaguchi, Japan

Nobukazu Yamahira