Yoshitaka Sumi

Title: **Yoshitaka Sumi: Innovations in Propylene Resin and Molded Polypropylene**

Introduction

Yoshitaka Sumi is a prominent inventor based in Ichihara, Japan, known for his contributions to the field of polymer science. With a remarkable portfolio of 6 patents, Sumi has focused his work on advancing the properties and applications of propylene resin and molded polypropylene.

Latest Patents

Among Sumi's latest innovations is a patented **propylene resin composition**. This formulation consists of a propylene-α-olefin random copolymer with a high proportion of propylene units (99.1% to 99.9% by weight) along with another copolymer containing 70% to 90% propylene units. This composition is engineered to possess specific dynamic viscoelasticity characteristics, providing a raw material that excels in transparency, stress-whitening resistance, impact resistance at low temperatures, and heat resistance.

Sumi also holds a patent for **molded polypropylene** that demonstrates an exceptional balance of material properties. This innovative molded product features crystalline polypropylene as a matrix, combined with a propylene-α-olefin copolymer, allowing for enhanced impact resistance, transparency, gloss, and reduced molding shrinkage and whitening. Notably, the copolymer disperses within the crystalline polypropylene to form interconnected domains, improving the material's performance during molding.

Career Highlights

Yoshitaka Sumi has received recognition for his innovative work in polymer compositions throughout his career. He has contributed significantly to the development of materials that meet diverse industrial needs, reflecting his expertise in polymer science. His tenure at Chisso Corporation underscores his role in advancing materials technology.

Collaborations

Throughout his career, Sumi has worked alongside esteemed colleagues such as Takanori Nakashima and Shinichi Akitaya. These collaborations have enriched his research and innovation efforts, leading to significant advancements in the field of plastics and polymers.

Conclusion

Yoshitaka Sumi's inventive contributions to propylene resin and molded polypropylene demonstrate his enduring impact on material science. His patents not only highlight his technical expertise but also illustrate the potential applications of his innovations in various industries. As the need for advanced materials continues to grow, Sumi's work remains pivotal in shaping the future of polymer technology.