thermosetting polymer, thermally molding, polymer film

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Ibaraki, Japan--January 24, 2004-- Nitto Denko Corporation (TSE: 6988) is pleased to announce that it has succeeded in developing a new thermosetting polymer with a high refractive index.

The new polymer has a refractive index of 1.76, the highest level in the world, and at the same time has excellent thermal resistance and processing properties as a thermosetting material.

Moreover, the addition of titania, zirconia, and other metal oxide nanoparticles with a high refractive index enables the design of other new materials with even higher refraction, and this will contribute to low power consumption and thinness through the enhancement of light emission-reception efficiency in equipment.

Based on the effective use of polymer properties, this material is expected to be used in a wide range of applications, including optical materials and optical communications-related optical materials for LCD, EL (electroluminescent), and other display devices, as well as luminous and photosensitive devices such as LEDs and CCDs.

The 21st century is the century of light and the century of the environment. Large-size LCD and plasma displays have formed markets, and organic EL displays have also begun to appear on the market. Furthermore, mass production of white LEDs has begun, and their luminous efficiency surpasses that of incandescent light bulbs and nearly surpasses that of fluorescent lamps.

One of the important technologies in the development of such new products is light control technology. Efficiently controlling light enhances the usage efficiency of light and enables high luminance as well as low power consumption. Moreover, in the case of CCDs used in digital cameras, there is a need to guarantee the amount of light received per pixel due to the contraction of pixel size associated with an increase in the number of pixels.

Optical polymers used in light emitting elements and CCDs require higher refractive indices to cope with such challenges. At the same time, superior processing and thermal resistance properties are also necessary to ensure the basic performance of materials incorporated in electronic components.

(1) Excellent luminous and photosensitive efficiency resulting from high refractive index

Highest refractive index level in the world: This polymer has a refractive index of 1.76. Compared with previous polymers, the refractive index has risen by 10-15%; for example, when used in LEDs, it will be possible to enhance luminous efficiency by about 30%. As a result, even higher luminance or a reduction in power consumption can be achieved.

In terms of its characteristics as a thermosetting material, this material has excellent processing and thermal resistance properties. In other words, by thermally molding this polymer film or powder, it is possible to mold it into a material of various shapes that has thermal resistance.

Adding titania, zirconia and other metal oxide nanoparticles with a high refractive index to this polymer has enabled the design of materials with even higher refraction.

By mixing titania with this polymer, Nitto Denko has already succeeded in developing a prototype material with a refractive index of 2.10.

Projected applications: Various applications can be expected, without being limited to those outlined below

It will be possible to improve the light emission and reception efficiency of white LEDs, which have been called the light of the 21st century.

It will be possible to improve the performance of antireflective films, which are used in LCD and other display devices.

It will be possible to increase the amount of light received, which facilitates the design of highly sensitive CCDs and high-definition CCDs. The creation of thin lenses will also contribute to the development of thinner equipment.

Nitto Denko Corporation (TSE: 6988). Incorporated in 1918, Nitto Denko designs, manufactures and sells a wide range of adhesive tapes, electronic components, and medical equipment. The company remains focused on attaining top global market share in many of its core products. The company has 10 divisions and group sales in fiscal year 2000 amounted to 365.6 billion yen.

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Distributed by JCN Newswire / Publication date: 2004-01-23 - Original release Nov. 2003

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