Hisao Okumura

Title: **Innovative Contributions of Hisao Okumura in the Field of Materials Science**

Introduction

Hisao Okumura, an inventor based in Tokyo, Japan, has made significant strides in materials science through his innovative patents. With a forte in developing specialized films and laminated bodies, he holds three patents that underscore his contribution to the industry.

Latest Patents

Okumura’s most notable inventions revolve around advanced polyester materials. One of his latest patents is for a **flame-retardant biaxially-oriented polyester film**. This invention is characterized by its porous structure and high reflectance. Composed primarily of polyethylene terephthalate, the film includes a phosphorus-based flame retardant, ensuring it maintains safety standards in various applications. The polyester film boasts an intrinsic viscosity of 0.50 to 0.64 dL/g, a density of 1.21 to 1.27 g/cm, and a mass content of polyethylene terephthalate between 70% to 97%. With an impressive reflectance of 60% to 74% at a wavelength of 400 to 700 nm, the film has a thickness range of 15 to 45 μm.

Another significant invention is the **laminated body** that exhibits excellent adhesive properties, especially when bonding low-polarity metal components in the presence of hot water. This laminated body includes a resin substrate and a specially designed easily adhesive layer. The adhesive resin layer consists of polyolefin with key functional groups, ensuring robust adherence even under challenging conditions.

Career Highlights

Throughout his career, Okumura has been associated with reputable companies, such as Toyobo Co., Ltd. and Toyoba Co., Ltd. His work in these organizations has facilitated the development of his patented technologies and has positioned him as a notable figure in the field of materials innovation.

Collaborations

Okumura has collaborated with talented individuals such as Shinya Watanabe and Ai Koganemaru, who have contributed their expertise to enhance the efficacy of his inventions. This collaborative effort signifies the importance of teamwork in driving innovations that address complex challenges in materials science.

Conclusion

Hisao Okumura’s inventive work in flame-retardant polyester films and advanced laminated bodies showcases his commitment to enhancing safety and functionality in material applications. With several patents to his name, he continues to influence the domain of materials innovation significantly. His ongoing research and partnerships will likely result in further advancements that benefit various industries.