Location History:
- Tokyo, JP (1994 - 1996)
- Chiba, JP (1996)
Company Filing History:
3 out of 1,805 
1 out of 326 
Years Active: 1994-1996
Title: Izumi Ishikawa: Innovator in Polyethylene Technology
Introduction
Izumi Ishikawa is a prominent inventor based in Tokyo, Japan. She has made significant contributions to the field of polyethylene technology, particularly in applications related to electrical insulation. With a total of 3 patents, her work has been instrumental in advancing materials used in high-voltage power cables.
Latest Patents
One of her latest patents is a polyethylene composition designed for use in insulations and joints of extra-high voltage power cables. This innovative composition includes a cross-linking agent, which is an organic peroxide that has undergone purification processing, along with an antioxidant. The resulting cross-linked composition demonstrates a dielectric loss tangent (tan.delta.) of less than or equal to 0.07% at a temperature of 90°C and under an electric field stress of 20 kV/mm. This polyethylene composition is particularly effective in minimizing dielectric loss, even under high temperatures or electric field stresses, making it ideal for insulations and joints in extra-high voltage power cables of 275 kV or more.
Another notable patent involves an insulated wire that comprises a conductor and at least two insulating layers. The inner insulating layer is made from a polyolefin compound that contains 20 to 80 parts by weight of at least one substance selected from ethylene alpha-olefin copolymer and ethylene alpha-olefin polyene copolymer. The outer insulating layer is primarily composed of a heat-resistant resin that is halogen-free, ensuring safety and efficiency in electrical applications.
Career Highlights
Throughout her career, Izumi Ishikawa has worked with notable companies such as Fujikura Limited and Nof Corporation. Her experience in these organizations has allowed her to develop and refine her innovative ideas in the field of electrical insulation materials.
Collaborations
Izumi has collaborated with esteemed colleagues, including Isao Takahashi and Hideo Sunazuka. These partnerships have contributed to her success and the advancement of her inventions.
Conclusion
Izumi Ishikawa's contributions to polyethylene technology and electrical insulation have made her a key figure in her field. Her innovative patents continue to influence the industry and enhance the safety and efficiency of high-voltage power systems.