Location History:
- Nara, JP (2000)
- Himeji, JP (2002 - 2020)
- Tokyo, JP (2022)
Company Filing History:
10 out of 1,165 
6 out of 645 
1 out of 373 
Years Active: 2000-2022
Title: Kiyoharu Tsutsumi: Innovator in Advanced Materials
Introduction
Kiyoharu Tsutsumi is a prominent inventor based in Himeji, Japan, recognized for his significant contributions to the field of material science. He holds a noteworthy portfolio of 18 patents, focusing primarily on innovative prepreg materials and adhesives designed to excel in high-performance applications.
Latest Patents
One of Tsutsumi's latest innovations is a sheet-shaped prepreg that combines a low coefficient of linear thermal expansion with high flexibility, excellent anti-warpage performance, and cracking resistance. This advanced material comprises a curable composition and a porous support impregnated with the composition. The support is crafted from a material with a linear thermal expansion coefficient of 10 ppm/K or lower, facilitating the creation of cured products with a glass transition temperature range of -60°C to 100°C. Furthermore, the curable composition consists of one or more curable compounds (A) and at least one curing agent (B) or curing catalyst (C), with a focus on using epoxides.
In addition, Tsutsumi developed a high-performance adhesive designed for secure bonding in elevated temperature environments. This adhesive allows for easy removal of adhered components without leaving residue, making it an efficient choice for various applications. The composition of the adhesive includes a multivalent vinyl ether compound (A) and compounds (B) and (C), which enhance its performance and versatility.
Career Highlights
Throughout his career, Tsutsumi has made impactful strides while working with well-regarded companies, including Daicel Chemical Industries, Ltd. and Daicel Corporation. His innovative mindset and dedication to advancing material technologies have been pivotal in enhancing product performance and reliability.
Collaborations
Tsutsumi has collaborated with talented individuals such as Yoshinori Funaki and Keizo Inoue, among others. These collaborations have further aided in the development of groundbreaking advancements in material science.
Conclusion
Kiyoharu Tsutsumi’s contributions to the field of advanced materials and adhesives highlight his role as a leading inventor. His extensive patent portfolio reflecting 18 patents demonstrates his commitment to innovation and excellence in material technology. As he continues to push the boundaries of research, his work is likely to have a lasting impact on various industries.