Mitsui Chemicals, Inc.

Wataru Yamada

Tatsuya Nakamura

Isao Hara

Atsushi Shibahara

Akiko Matsumoto

Kou Tsurugi

Kazumori Kawamura

Shiori Hanada

Fumiaki Nishino

Yasuyuki Harada

Toshihiro Muroto

Takashi Yukita

Masahiro Yamashita

Hiromu Kaneyoshi

Nobukazu Yamahira

Siori Hanada

An object of the invention is to provide a solid polyaluminoxane composition suitably used as a cocatalyst and a catalyst carrier in combination with an olefin oligomerization or polymerization catalyst, without the use of solid inorganic carriers such as silica. The solid polyaluminoxane composition of the invention includes a polyalkylaluminoxane and a trialkylaluminum, and has a solubility in n-hexane at 25&#xb0; C. of less than 0.50 mol % as measured by a specific method (i), a solubility in toluene at 25&#xb0; C. of less than 1.0 mol % as measured by a specific method (ii), and a 13 mol % or more molar fraction of alkyl groups derived from the trialkylaluminum moieties relative to the total number of moles of alkyl groups derived from the polyalkylaluminoxane moieties and the alkyl groups derived from the trialkylaluminum moieties as measured with respect to tetrahydrofuran-dsoluble components by a specific method (iii).

Solid polyaluminoxane composition, olefin polymerization catalyst, olefin polymer production method and solid polyaluminoxane composition production method

[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

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Chiba, Japan

Wataru Yamada