Katsutoshi Hirashima

Title: Katsutoshi Hirashima: Innovator in Polyimidesiloxane Solutions and Flame-Resistant Wiring Boards

Introduction: Katsutoshi Hirashima is a renowned inventor based in Yamaguchi, Japan. With an impressive portfolio of two patents, he has made significant strides in the fields of materials science and electrical engineering. His innovative solutions have provided advancements in the performance and safety of electrical components.

Latest Patents: Among Hirashima's notable inventions is a polyimidesiloxane solution composition designed to enhance defoaming capabilities while maintaining the wettability of outer lead bonded portions on wiring boards. This invention addresses critical problems related to the application and curing process, ensuring the formation of an effective insulating cured film. It comprises an organic solvent, a soluble polyimidesiloxane, curable components such as epoxy compounds, polyvalent isocyanate compounds, and a silicone defoamer. The latter includes dimethylpolysiloxane, a hydrophilic polysiloxane compound, and micro-powder silica.

Another significant invention is a flexible wiring board for tape carrier packages that boasts improved flame resistance. This innovative wiring board features an insulating film with a bending slit, a wiring pattern that crosses the bending slit, and an adhesive layer to ensure structural integrity. The design integrates a flex resin layer for protection, along with an overcoat layer formed from a curable resin composition. When cured, this overcoat exhibits excellent mechanical properties and electrical insulation, providing remarkable soldering resistance and a high oxygen index.

Career Highlights: At Ube Industries, Inc., Hirashima has contributed his expertise in advanced material formulations and electrical engineering solutions. His inventions have propelled the company towards new innovations in the manufacturing of electrical components.

Collaborations: Hirashima has collaborated with other talented professionals in his field, including Koji Hayashi and Yoshiki Tanaka. These collaborations reflect a shared commitment to advancing technology in materials science and electrical engineering.

Conclusion: Katsutoshi Hirashima exemplifies the spirit of innovation within the Japanese manufacturing landscape. His contributions to polyimidesiloxane solutions and flame-resistant wiring boards not only showcase his ingenuity but also enhance the performance and safety of electrical devices in various applications. As he continues to push the boundaries of technology, his work remains pivotal in the evolving landscape of materials science.