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:
May. 28, 1985
Filed:
Jul. 19, 1984
Yoshito Yoshimura, Yokkaichi, JP;
Noboru Oshima, Suzuka, JP;
Isamu Shimizu, Kameyama, JP;
Shinsuke Yamaguchi, Tokyo, JP;
Tatsuo Fujimaki, Higashimurayama, JP;
Tomoharu Yamada, Higashimurayama, JP;
Seisuke Tomita, Tokorozawa, JP;
Bridgestone Tire Company Limited, Tokyo, JP;
Japan Synthetic Rubber Co., Ltd., Tokyo, JP;
Abstract
A styrene-butadiene copolymer having a high styrene content is disclosed, which is obtained by polymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium compound and, if necessary, a Lewis base and then coupling with a tin halide compound. This copolymer contains in its main chain at least 30 wt % of polymer having a tin-carbon bond and has a bound styrene content of more than 25 wt % but not more than 60 wt % and a content of vinyl bond in butadiene portion of not less than 30% but less than 50%.