Toyomi Hashizume

Title: **Innovative Contributions of Toyomi Hashizume in Toner Technology**

Introduction

Toyomi Hashizume is a distinguished inventor based in Ichihara, Japan, recognized for her significant contributions to toner technology. With a total of three patents to her name, Hashizume has demonstrated a commitment to advancing the field of electrostatic image development. Her innovative work primarily focuses on the formulation of toners that enhance image quality while minimizing the need for additional solutions in heat roller fixation systems.

Latest Patents

Toyomi Hashizume's most recent patents include innovations in toner composition and manufacturing methods. Her first patent describes a toner for electrostatic image development made from a polyester resin that assumes a spherical or generally spherical shape. This design facilitates the application of an oilless fixation system, which can produce high-quality images without relying on an anti-offset solution. The toner is characterized by its specific temperature ranges, with a flow beginning temperature between 90°C and 120°C, a T1/2 temperature exceeding 120°C up to 160°C, and a flow ending temperature between 130°C and 170°C.

In her second patent, Hashizume further refines the polyester resin toner to improve fixing properties and image quality specifically in heat roller fixation systems. The characteristics of the resin include a weight-average molecular weight of 30,000 or more, and molecular weights within defined ratios ensuring optimal performance. The toner's particle shape maintains an average circularity higher than 0.97, further enhancing its usability in imaging technologies.

Career Highlights

Hashizume currently works at Dainippon Ink and Chemicals, Incorporated, where she collaborates with a talented team in the development of advanced toner technologies. Her innovative approach and deep understanding of material properties have positioned her as a key figure in her organization.

Collaborations

Throughout her career, Toyomi Hashizume has worked closely with notable colleagues such as Hitoshi Takayanagi and Takashi Ito. This collaborative environment has fostered creativity and led to breakthroughs in the formulation and production of toners tailored for various applications.

Conclusion

Toyomi Hashizume exemplifies the spirit of innovation within the realm of toner technology. Her patented inventions significantly impact the electrostatic imaging industry, addressing critical needs in image quality and production efficiency. Through her work at Dainippon Ink and Chemicals, her contributions are poised to influence the future of imaging technologies for years to come.