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. 09, 2012
Filed:
Dec. 04, 2009
Masato Murakami, Ichihara, JP;
Koji Shiba, Ichihara, JP;
Takeshi Shoda, Ichihara, JP;
Mitsuharu Anbe, Ichihara, JP;
Masato Murakami, Ichihara, JP;
Koji Shiba, Ichihara, JP;
Takeshi Shoda, Ichihara, JP;
Mitsuharu Anbe, Ichihara, JP;
UBE Industries, Ltd, , JP;
Abstract
Provided by using a catalyst containing an yttrium compound is conjugated diene polymer with very low solution viscosity, improved workability, high degree of branching, and high content of cis-1,4 structures. Also provided is a rubber composition utilizing the polymer and allowing excellent dispersion of reinforcing agent. According to a method of manufacturing a conjugated diene polymer characterized by polymerizing a conjugated diene at 50 to 120° C. in the presence of a catalyst obtained from (A) an yttrium compound, (B) an ionic compound consisting of a non-coordinating anion and a cation, and (C) an organoaluminum compound, the conjugated diene polymer has the following characteristics that: (1) a ratio (T/ML) between a 5 wt % toluene solution viscosity (T) measured at 25° C. and a Mooney viscosity (ML) at 100° C. is 0.1 to 1.2; and (2) a content of cis-1,4 structures is 80% or higher, and a content of 1,2 structures is lower than 5%.