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:
Nov. 25, 2003
Filed:
Jun. 18, 2001
Kazuo Soga, late of Ichihara, JP;
Michihiko Asai, Tsukuba, JP;
Yasuzo Suzuki, Tsukuba, JP;
Akira Miyazawa, Tsukuba, JP;
Kenji Tsuchihara, Tsukuba, JP;
Masahide Murata, Tokyo, JP;
Hiroyuki Ozaki, Tsukuba, JP;
Masanao Kawabe, Tsukuba, JP;
Yoshifumi Fukui, Tsukuba, JP;
Jizhy Jin, Kanazawa, JP;
Hideaki Hagihara, Tsukuba, JP;
Toshio Kase, Tsukuba, JP;
Other;
Abstract
A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on the total molecular chains, of living chains containing a transition metal of group IV of the Periodic table at a terminal thereof; a polymer (ii) obtained by modifying terminals of the polymer (i); and a polymer (iii) obtained by coupling the polymers (i). These polymers (i), (ii) and (iii) are obtained by polymerizing a conjugated diene monomer alone or with a copolymerizable monomer at a specific temperature in the presence of a catalyst comprising a compound (A) of a transition metal of group IV of the periodic table having a cyclopentadienyl structure and a co-catalyst (B) selected from organoaluminum-oxy compound (a) and others and optionally further by contacting the resultant polymer with a terminal modifier or a coupling agent.