Company Filing History:
Years Active: 2016-2020
Title: Yui Yoshida: Innovator in Polyarylene Sulfide Production
Introduction
Yui Yoshida is a prominent inventor based in Tokyo, Japan. She has made significant contributions to the field of polymer chemistry, particularly in the production of polyarylene sulfide (PAS). With a total of 3 patents to her name, Yoshida's work has garnered attention for its innovative approaches and practical applications.
Latest Patents
Yui Yoshida's latest patents include a method for producing polyarylene sulfide. This method involves a preparation step that creates a charged mixture containing an organic amide solvent, a sulfur source, water, and a dihalo aromatic compound. The first-stage polymerization occurs at temperatures ranging from 170 to 280°C, resulting in a prepolymer with a conversion ratio of the dihalo aromatic compound of 50% or greater. The second-stage polymerization continues in a phase-separated state at temperatures between 245 and 290°C, incorporating a polyfunctional compound. This innovative process produces a PAS with a melt viscosity of 0.1 to 8000 Pa·s at 310°C and a shear rate of 1216 sec.
Another notable patent focuses on granular polyarylene sulfide. This granular product features an —S— substituent at the terminal, formed by the cleavage of a disulfide compound. The granular polyarylene sulfide is characterized as an oversize fraction after sifting through a sieve with a mesh size of at least 38 μm. It has a halogen content of no more than 1,500 ppm and a melt viscosity of 3 to 100 Pa·s when measured at 310°C and a shear rate of 1,200 sec. This product is well-balanced in terms of melt viscosity, halogen content, nitrogen content, thermal stability, and yield.
Career Highlights
Yui Yoshida is currently employed at Kureha Corporation, where she continues to advance her research and development efforts in polymer science. Her work has not only contributed to the company's portfolio but has also positioned her as a leading figure in the industry.
Collaborations
Yoshida collaborates with esteemed colleagues, including Akihiro Konno and Ken-Ichi Takaki. These partnerships enhance her research capabilities and foster innovation within her projects.
Conclusion
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.