Location History:
- Himeji, JP (1992)
- Hyogo, JP (1994 - 1997)
Company Filing History:
Years Active: 1992-1997
Title: Tsutomu Yamato: Innovator in Polycarbonate Production
Introduction
Tsutomu Yamato is a prominent inventor based in Hyogo, Japan. He has made significant contributions to the field of polycarbonate production, holding a total of 10 patents. His innovative approaches have enhanced the efficiency and quality of polycarbonate manufacturing processes.
Latest Patents
One of Tsutomu Yamato's latest patents involves a process for producing polycarbonate through melt polycondensation via transesterification. In this method, a dihydroxy compound and a diester of carbonic acid are subjected to a two-stage reaction. The first stage involves preparing a polycarbonate prepolymer, followed by polycondensation in a residence time ranging from 15 to less than 60 minutes. This process utilizes at least one paddle-type self-cleaning twin-screw extruder, enabling the production of a colorless, transparent polycarbonate with a high molecular weight at an industrial scale.
Another notable patent by Yamato focuses on producing polycarbonate through transesterification using a dihydroxy compound such as 2,2-bis(4-hydroxyphenyl)propane and a diester of carbonic acid like bisphenyl carbonate. This process is conducted in a reactor made of stainless steel, which is treated by electropolishing or acid pickling. The use of specific nitrogen-containing electron-donating compounds as transesterification catalysts further enhances the efficiency of the process.
Career Highlights
Tsutomu Yamato is associated with Daicel Chemical Industries, Ltd., where he has been instrumental in advancing polycarbonate production techniques. His work has not only contributed to the company's success but has also had a lasting impact on the industry.
Collaborations
Throughout his career, Yamato has collaborated with notable colleagues, including Tatsuya Kanno and Yasuhiro Oshino. These partnerships have fostered innovation and have led to the development of cutting-edge technologies in polycarbonate production.
Conclusion
Tsutomu Yamato's contributions to the field of polycarbonate production exemplify his innovative spirit and dedication to advancing manufacturing processes. His patents reflect a commitment to quality and efficiency, making him a significant figure in the industry.