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:
Jul. 26, 2016
Filed:
Jun. 18, 2013
Bridgestone Corporation, Chuo-ku, Tokyo, JP;
Satoru Tamaki, Kodaira, JP;
Olivier Tardif, Wako, JP;
BRIDGESTONE CORPORATION, Tokyo, JP;
Abstract
The present invention provides a method for synthesizing a polybutadiene more efficiently and stably which is possible to obtain a rubber composition and a tire excellent in durability (fracture resistance, wear resistance and crack growth resistance). A method for producing a polybutadiene, where a butadiene monomer is polymerized with the existence of rare-earth element compounds represented by the following formula (i):M-(NQ)(NQ)(NQ)  (i)(in the formula, M is at least one selected from lanthanides, scandium and yttrium; (NQ), (NQ)and (NQ)are amide groups which may be the same or different to each other, and have M-N bonds).