Yoshiyuki Ohnuma

**Title: Innovations of Yoshiyuki Ohnuma in Polyurethane Foam Technology**

Introduction

Yoshiyuki Ohnuma is a noted inventor based in Ashikaga, Japan, widely recognized for his contributions to the field of polyurethane foam technology. With a total of two patents, he has made significant advancements that enhance the properties of foam materials, particularly in terms of flame retardance and dimensional stability.

Latest Patents

Yoshiyuki Ohnuma's latest patents focus on innovative preparation methods aimed at improving the performance characteristics of rigid polyurethane foams. His first patent, titled "Preparation method for rigid polyurethane foam," presents a unique process that creates low-density polyurethane foam using carbon dioxide generated from the reaction of water and polyisocyanate. This involves achieving specific dimensions for the foam cells and integrating carbon dioxide in various states to optimize properties such as flame resistance and stability.

The second patent, "Process for the production of urethane-modified polyisocyanurate foam," outlines a method involving a high-pressure mixing process that combines polyisocyanate with an aromatic polyester polyol and various additives. The choice of catalysts is notably at least three compounds, including N,N',N'-tris(dimethylaminopropyl)-S-hexahydrotriazine, which contribute to the successful formulation of the foam.

Career Highlights

Yoshiyuki Ohnuma has dedicated his career to developing advanced materials that meet the increasing demands of modern applications. His role at Achilles Corporation exemplifies his commitment to innovation in the field, focusing on creating reliable and efficient foam products that benefit various industries.

Collaborations

Throughout his career, Ohnuma has collaborated with several prominent colleagues, including Norio Tanaka and Junichiro Mori. Their combined expertise has aided in refining the processes and technologies involved in polyurethane foam production, leading to successful patent applications and advancements in the industry.

Conclusion

Yoshiyuki Ohnuma stands out as an inventor committed to enhancing the quality and safety of polyurethane foams through innovative methodologies. With his significant contributions to the field and ongoing collaborations, he continues to shape the future of material technologies. His work not only exemplifies creativity and technical skill but also paves the way for future innovations in foam applications.