The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2004
Filed:
Nov. 08, 2001
Kazuo Soga, late of Tsukuba, JP;
Takeshi Shiono, Yokohama, JP;
Michihiko Asai, Tsukuba, JP;
Yasuzo Suzuki, Tsukuba, JP;
Akira Miyazawa, Tsukuba, JP;
Kenji Tsuchihara, Tsukuba, JP;
Masahide Murata, Tokyo, JP;
Hiroyuki Ozaki, Yokohama, JP;
Masanao Kawabe, Kitakyushu, JP;
Toshio Kase, Yokosuka, JP;
Jizhu Jin, Kanazawa, JP;
Hideaki Hagiwara, Tsukuba, JP;
Yoshifumi Fukui, Toyonaka, JP;
Other;
Abstract
A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.