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:
Oct. 15, 2013
Filed:
Feb. 13, 2012
Takahiro Nakamura, Chuo-ku, JP;
Kouichirou Tani, Chuo-ku, JP;
Ryouji Tanaka, Chuo-ku, JP;
Takuo Sone, Chuo-ku, JP;
Toshihiro Tadaki, Chuo-ku, JP;
Junko Kurazumi, Kodaira, JP;
Koji Masaki, Kodaira, JP;
Yoichi Ozawa, Kodaira, JP;
Takahiro Nakamura, Chuo-ku, JP;
Kouichirou Tani, Chuo-ku, JP;
Ryouji Tanaka, Chuo-ku, JP;
Takuo Sone, Chuo-ku, JP;
Toshihiro Tadaki, Chuo-ku, JP;
Junko Kurazumi, Kodaira, JP;
Koji Masaki, Kodaira, JP;
Yoichi Ozawa, Kodaira, JP;
JSR Corporation, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and/or organoaluminum compound, and an iodine-containing compound.