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May 30, 2019
Toray Industries, Inc.
Toray Develops Low-Dielectric-Loss Polyimide Material for Electronic Components in 5G Communications and Millimeter-Wave Radar

Tokyo, May 30, 2019—Toray Industries, Inc. (President: Akihiro Nikkaku) today announced that it has developed a polyimide material suitable for electronic components used in 5G1 communications and for millimeter-wave radar. 5G is an increasingly popular high-speed, stable communications technology capable of handling large data volumes, and millimeter-wave radar is employed in automated driving and other technologies. The new Toray material has the heat resistance, mechanical characteristics and adhesive properties typical of polyimides, coupled with the low-dielectric-loss performance that is essential for high-speed communications. It is expected to make a significant contribution to the performance of high-frequency parts in electronic components in these fields. The new material leverages Toray’s many years of experience in functional polyimide design technologies and precision molecular design driven by an R&D approach of pursuing the ultimate limits. The low-dielectric-loss polyimide material features high heat resistance and superior mechanical and adhesive properties, and it reduces electrical energy loss ratio (loss tangent) to 0.001 (20GHz). Toray will continue to pursue the potential of the new material with further development efforts, including adding photosensitivity properties and manufacturing the material in B-stage sheet form. The application of the new material will reduce electrical energy loss and also enable the stable high-speed transmission of large data volumes, boost the performance of millimeter-wave radar for distance measurement, and contribute to the miniaturization of components. Toray continues to work to commercialize various resins optimized for the 5G era. The addition of this newly developed material to its product lineup is a strong step forward in Toray’s efforts to provide advanced materials for semiconductor devices and electronic components that will support the next generation of communications technologies. The Toray Group continues to leverage its core technologies in organic synthetic chemistry, polymer chemistry, biotechnology, and nanotechnology to research and develop innovative materials and technologies that have the potential to transform society at a fundamental level. This is how the Toray Group delivers on its corporate philosophy of “contributing to society through the creation of new value with innovative ideas, technologies and products.”

1 5G is recognized as a next-generation communication technology since it enables high-speed, high-volume and multiple simultaneous access communications, coupled with low delay. In addition to using conventional frequency bands below 6GHz, 5G technologies also require a new frequency band of 20GHz and above, referred to as the millimeter-wave band. One of the challenges facing the commercialization of 5G communications was the development of a material that has the dielectric properties suited to communications at high frequency bands, as well as the heat resistance needed to withstand mounting on semiconductors, and the adhesive properties required to enable to adhere to copper wiring. The same challenges were also being faced with millimeter-wave radar components, uses for which are projected to expand to include safe driving and automated driving technologies, including the detection of pedestrians and the measurement of distance from obstacles.
Explanation of technical terms
Dielectric loss:
A figure that expresses the degree of electrical energy loss. This figure describes the phenomenon by which electrical energy is converted to heat when a high frequency is applied to an insulator such as a resin or plastic. The larger the numerical value, the greater the conversion of electrical energy to heat in the insulator becomes and accordingly the greater the attenuation of the signal.

Dielectric properties:
The dielectric loss and dielectric constant created with an AC electric field is applied to an insulator (with low figures indicating good insulation properties).