This inventor holds 3 USPTO granted patents. Top assignees: Dai-Ichi Kogyo Seiyaku Co., Ltd., Dai-Chj Kogyo Seiyaki Co., Ltd., Nippon Shokubai Co., Ltd.. Active years: 2002-2010.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Company Filing History:
2 out of 252 
1 out of 1 
1 out of 1,335 Years Active: 2002-2010
Title: Innovations by Itsuko Hamaguchi: A Pioneer in Polymer Chemistry
Introduction
Itsuko Hamaguchi is an esteemed inventor based in Kyoto, Japan, known for her significant contributions to polymer chemistry. She holds three patents that demonstrate her expertise and innovative spirit in developing novel polymer compositions.
Latest Patents
Among her latest inventions is a vinylpyrrolidone-based polymer composition. This unique composition features enhanced storage stability and minimizes the reduction in molecular weight (K value) under shear stress. It comprises a vinylpyrrolidone-based polymer that includes between 1 to 10,000 ppm of biguanides and from 1,000 to 30,000 ppm of 2-pyrrolidone, along with ammonia in amounts ranging from 1 to 5,000 ppm.
Another noteworthy patent by Itsuko is a method for preparing a high-purity vinylpyrrolidone polymer. This innovative process employs a redox initiator, including organic peroxide and sulfite, for polymerization. The resultant polymer can be purified by contacting it with an anion exchange resin, ensuring clarity when dissolved in organic solvents.
Career Highlights
Throughout her career, Itsuko Hamaguchi has worked with prominent companies, notably Dai-ichi Kogyo Seiyaku Co., Ltd. and Nippon Shokubai Co., Ltd. Her experiences at these organizations have not only advanced her expertise but have significantly contributed to the field of polymer science.
Collaborations
Itsuko has collaborated with esteemed colleagues, including Keiichi Fujise and Akira Kitada. These collaborations have facilitated a vibrant exchange of ideas and innovations, resulting in groundbreaking advancements in their shared fields of research.
Conclusion
Itsuko Hamaguchi stands out as an influential figure in the realm of polymer chemistry. Her inventive spirit and dedication to research have led to important advancements, particularly in vinylpyrrolidone-based polymers. As she continues to innovate, her work will undoubtedly inspire future generations of inventors and researchers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile