Location History:
- Tokyo, JP (1999 - 2000)
- Chiba, JP (1996 - 2024)
Company Filing History:
4 out of 1,256 
3 out of 7 
1 out of 1,257 
Years Active: 1996-2024
Title: Seiji Hanatani: Innovator in Expansion Molded Products
Introduction
Seiji Hanatani is a notable inventor based in Chiba, Japan. He has made significant contributions to the field of materials science, particularly in the development of expansion molded products. With a total of 7 patents to his name, Hanatani's work focuses on enhancing the properties of materials used in various applications.
Latest Patents
Hanatani's latest patents include innovations such as a web, a stampable sheet, and an expansion molded product. These inventions aim to provide an expansion molded product that excels in sound absorption properties and rigidity while being resistant to tearing after bending deformation. The disclosed web, stampable sheet, and expansion molded product incorporate a reinforcing fiber that consists of both inorganic and organic fibers, a thermoplastic resin, and thermal expandable particles. The specific proportions of these materials are carefully defined to optimize performance, with the reinforcing fiber making up 20 mass % to 55 mass % of the total, and the organic fiber comprising 25 mass % to 77 mass % of the total fiber content. Additionally, the reinforcing fiber has an average length of 8 mm or more, and the organic fiber exhibits a breaking elongation of 15% or more.
Another significant patent involves a web containing a thermoplastic resin, reinforcing fibers, and thermal expandable particles. In this invention, the thermoplastic resin and reinforcing fibers are uniformly dispersed throughout the thickness of the web, while the thermal expandable particles are eccentrically located toward one side of the web. This design results in opposite sides of the web having substantially different specific gravity and density, enhancing its utility in various applications.
Career Highlights
Throughout his career, Seiji Hanatani has worked with prominent companies such as Kawasaki Steel Corporation and K-Plasheet Corporation. His experience in these organizations has contributed to his expertise in materials development and innovation.
Collaborations
Hanatani has collaborated with notable colleagues, including Yuichi Uchida and Fumiaki Yoshikawa. These partnerships have likely fostered a creative environment that has led to the advancement of his inventions.
Conclusion
Seiji Hanatani's contributions to the field of expansion molded products demonstrate his innovative spirit and commitment to enhancing material properties. His patents reflect a deep understanding of material science and a dedication to creating products that