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. 06, 2012
Filed:
Dec. 25, 2009
Applicants:
Michinori Suzuki, Chiba, JP;
Koji Shiba, Chiba, JP;
Masato Murakami, Chiba, JP;
Inventors:
Assignee:
Ube Industries, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 4/44 (2006.01); C08F 136/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed is a process for producing a conjugated diene polymer having a very high content of cis-1,4 structures by using an yttrium compound-containing catalyst that is relatively easy to handle and has a high activity. Specifically disclosed is a process for producing a conjugated diene polymer containing cis-1,4 structures at a ratio of 99% or higher, which is characterized by polymerizing a conjugated diene in the presence of a catalyst produced from (A) a specific yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound.