Hisayoshi Yanagihara

Title: Hisayoshi Yanagihara: Innovator in Propylene-Based Polymers

Introduction

Hisayoshi Yanagihara is a prominent inventor based in Oita, Japan. He has made significant contributions to the field of polymer science, particularly in the development of propylene-based polymers. With a total of 10 patents to his name, Yanagihara's work has had a substantial impact on the industry.

Latest Patents

His latest patents focus on a propylene-based polymer characterized by several key features. The polymer has a xylene-extraction insoluble portion (XI) of 99.0 wt % or greater. Additionally, it boasts an isotactic pentad ratio (IP) of 98.0% or greater, as measured by carbon nuclear magnetic resonance spectroscopy. The isotactic average chain length (N) is 500 or greater, and the total amount of fractions obtained by column separation of the xylene insolubles, with an average chain length (N) of 800 or greater, accounts for 10 wt % or more of the entirety. Furthermore, the polymer composition is prepared by combining this propylene-based polymer with at least a nucleating agent in the range of 0.05-15 wt %. Yanagihara has also developed a polymerization catalyst component that facilitates the production of such a propylene-based polymer.

Career Highlights

Throughout his career, Yanagihara has worked with notable companies, including Showa Denko K.K. and Japan Polyolefins Co., Ltd. His expertise in polymer chemistry has allowed him to contribute to various innovative projects and advancements in the field.

Collaborations

Yanagihara has collaborated with esteemed colleagues, including Kazuyuki Watanabe and Hirotoshi Takahashi. These partnerships have further enriched his research and development efforts in polymer science.

Conclusion

Hisayoshi Yanagihara is a distinguished inventor whose work in propylene-based polymers has led to significant advancements in the industry. His contributions continue to influence the field of polymer science and inspire future innovations.