Kazumasa Itonaga

Title: Kazumasa Itonaga: Innovator in Photochromic Technology

Introduction

Kazumasa Itonaga is a notable inventor based in Tokuyama, Japan. He has made significant contributions to the field of photochromic materials, holding a total of 3 patents. His work focuses on the development of advanced photochromic compositions that have practical applications in various industries.

Latest Patents

Itonaga's latest patents include a process for the production of photochromic cured products and a photochromic composition. The composition comprises (A) 100 parts by weight of a compound with at least one epoxy group and (B) 0.0001 to 10,000 parts by weight of a photochromic compound. The compound (A) is defined by a general formula where A represents a residue of an n-valent alcoholic hydroxyl-containing compound, a residue of an n-valent phenolic-hydroxyl-containing compound, or a residue of an n-valent carboxylic acid. The photochromic compounds (B) include fulgide compounds, spirooxazine compounds, and chromene compounds. The resulting polymer, obtained through radical polymerization, exhibits excellent durability of photochromic properties, a dark color-forming density, a fast color fading speed, transparency, and high surface hardness. This makes the polymer particularly suitable for use as a photochromic lens.

Career Highlights

Kazumasa Itonaga is associated with Tokuyama Corporation, where he has been instrumental in advancing photochromic technology. His innovative approaches have led to the development of materials that enhance the functionality and performance of photochromic products.

Collaborations

Itonaga has collaborated with notable colleagues such as Satoshi Imura and Takashi Kobayakawa. Their combined expertise has contributed to the successful development of new photochromic technologies.

Conclusion

Kazumasa Itonaga's work in the field of photochromic materials showcases his innovative spirit and dedication to advancing technology. His contributions have the potential to impact various applications, particularly in the production of photochromic lenses.