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:
Feb. 08, 2011
Filed:
Dec. 20, 2005
Naomi Okamoto, Ichihara, JP;
Mitsuharu Anbe, Ichihara, JP;
Jyun Yamashita, Ichihara, JP;
Tetsuji Nakajima, Ichihara, JP;
Takashi Kitamura, Ichihara, JP;
Osamu Kimura, Ichihara, JP;
Takashi Wada, Ichihara, JP;
Naomi Okamoto, Ichihara, JP;
Mitsuharu Anbe, Ichihara, JP;
Jyun Yamashita, Ichihara, JP;
Tetsuji Nakajima, Ichihara, JP;
Takashi Kitamura, Ichihara, JP;
Osamu Kimura, Ichihara, JP;
Takashi Wada, Ichihara, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
A process for producing a vinyl-cis-polybutadiene rubber, including mixing (A) vinyl-cis-polybutadiene obtained by (1) a step of adding a cis-1,4-polymerization catalyst obtainable from an organoaluminum compound and a soluble cobalt compound to a mixture containing 1,3-butadiene and a hydrocarbon-based organic solvent as the major components and having an adjusted water content, thereby subjecting the 1,3-butadiene to cis-1,4-polymerization and subsequently, (2) a step of making a catalyst obtainable from a soluble cobalt compound, an organoaluminum compound represented by the general formula, AlR(wherein R represents an alkyl group having from 1 to 6 carbon atoms, a phenyl group, or a cycloalkyl group), and carbon disulfide present in the resulting polymerization reaction mixture, thereby subjecting the 1,3-butadiene to 1,2-polymerization; and (B) cis-polybutadiene obtained by a step of adding the foregoing cis-1,4-polymerization catalyst, thereby subjecting the 1,3-butadiene to cis-1,4-polymerization and a rubber composition containing the resulting rubber.