Kohei Yamanaka

Title: Kohei Yamanaka: Innovator in Polypropylene Film Technology

Introduction

Kohei Yamanaka is a notable inventor based in Otsu, Japan. He has made significant contributions to the field of materials science, particularly in the development of advanced polypropylene films. His work focuses on enhancing the reliability and performance of films used in high voltage capacitors.

Latest Patents

Yamanaka holds a patent for a polypropylene film, metal membrane layered film, and film capacitor. This innovative polypropylene film exhibits excellent reliability and withstand voltage characteristics in high-temperature environments. It is designed for use in high voltage capacitors and features a structure that maintains stability against heat. The film is also noted for its excellent processability, ensuring it does not wrinkle during the conveyance process, including vapor deposition. The patent specifies that the absolute value of the difference between crystallite sizes in different directions is 3.0 nm or less, and the shrinkage stress in the machine direction is 2.0 MPa or less at 135°C.

Career Highlights

Yamanaka is associated with Toray Industries, Inc., a leading company in the field of advanced materials. His work has contributed to the company's reputation for innovation and quality in the production of high-performance films.

Collaborations

Yamanaka has collaborated with notable colleagues such as Yasuyuki Imanishi and Masatoshi Ohkura. Their combined expertise has furthered advancements in the field of materials science.

Conclusion

Kohei Yamanaka's contributions to polypropylene film technology exemplify the impact of innovative thinking in materials science. His patent reflects a commitment to enhancing the performance of materials used in critical applications.