Location History:
- Higashimurayama City, Tokyo, JP (1984)
- Tokyo, JP (1984)
- Higashimurayama, JP (1983 - 1985)
Company Filing History:
4 out of 504 
1 out of 377 
1 out of 832,680 Years Active: 1983-1985
Title: Tomoharu Yamada: Innovator in Styrene-Butadiene Copolymers
Introduction
Tomoharu Yamada is a notable inventor based in Higashimurayama, Japan. He has made significant contributions to the field of polymer chemistry, particularly in the development of styrene-butadiene copolymers. With a total of 5 patents to his name, Yamada's work has had a substantial impact on the rubber industry.
Latest Patents
Yamada's latest patents include innovative formulations of styrene-butadiene copolymers. One of his key inventions is a styrene-butadiene copolymer with a high styrene content. This copolymer is synthesized by polymerizing styrene and butadiene in a hydrocarbon solvent, utilizing an organolithium compound and, if necessary, a Lewis base, followed by coupling with a tin halide compound. The resulting copolymer contains at least 30 wt % of polymer with a tin-carbon bond and has a bound styrene content exceeding 25 wt % but not more than 60 wt %. Additionally, the vinyl bond content in the butadiene portion ranges from 30% to less than 50%. Another significant patent involves rubber compositions suitable for tires, which consist mainly of a rubber blend comprising 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber. This rubber is obtained by copolymerizing styrene with 1,3-butadiene and contains 3-30% by weight of bonded styrene, along with a minimum of 60% by weight of 1,2-bond in the butadiene unit.
Career Highlights
Throughout his career, Tomoharu Yamada has worked with prominent companies in the rubber industry. He has been associated with Bridgestone Tire Company Limited and Japan Synthetic Rubber Co., Ltd. His expertise in polymer chemistry has allowed him to contribute to advancements in tire technology and rubber formulations.
Collaborations
Yamada has collaborated with notable colleagues in his field, including Tatsuo Fujimaki and Seisuke Tomita. These collaborations have further enriched his research and development efforts in polymer science.
Conclusion
Tomoharu Yamada's innovative work in styrene-butadiene copolymers has
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