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Teijin Develops Hard-coating Technology for Automotive Windows

Published on 2017-03-10. Author : SpecialChem

TOKYO, Japan -- Teijin has developed a new hard-coating technology that can be applied evenly on large or complex-shaped automotive windows made of resin to achieve the same level of abrasion resistance as glass windows and double the weather resistance of conventional plastics glazing.

Aiming at Launch of Commercial Manufacturing Operations


Teijin initially will produce small-lot samples of actual windows for selected car models at a pilot plant in Matsuyama. Going forward, it will gradually verify production technologies for the manufacture of a wider range of windows on a mass-production basis, aiming at an early launch of full-scale commercial manufacturing operations.

Reducing Automobile Weights

Tenjing New Coating
Teijin Develops Hard-coating Technology
for Automotive Windows

  • To reduce automobile weights, automakers seek to use lightweight but highly abrasion-resistant back and side windows made of resin
  • Conventional polycarbonate (PC) plastics glazing, which are less abrasion-resistant than glass, can be scratched even by just raising or lowering them or by operating the windshield wipers
  • According to Japanese automobile safety standards, plastics glazing in car models released from July 2017 must offer enhanced abrasion resistance
  • The conventional wet method used for hard coating does not meet the required level of resistance. 
  • Plastics glazing in new cars will be required to be sufficiently weather resistant to prevent yellowing after long-term exposure to sunlight

Although there is a technology for adding plasma enhanced chemical vapor deposition (plasma CVD) layer to enhance the abrasion and weather resistance of wet coated PC to the level of glass, the size of the window is restricted to around 0.3 square meter, and it is also hard to apply plasma CVD to complex curved surfaces. Consequently, this technology does not offer a practical solution for plastics glazing under the new auto standards.

Collaboration with Tsukishima Kikai


Teijin collaborated with Tsukishima Kikai Co., Ltd. to develop a plasma CVD pilot plant that is capable of treating large and three-dimensional molded resin products with a uniform coating of plasma CVD. Actual-size plastics glazing exceeding one m2, including those with complex curves for back windows, are being treated at the pilot plant.

The New Hard-coating Technology


The new hard-coating technology firmly applies a plasma CVD layer to the wet hard-coat layer, thereby preventing oxygen or water vapor from penetrating and subsequently degrading the underlying wet hard-coat layer. Since the wet hard-coat layer absorbs the ultraviolet rays which cause degradation of resin, the duration until discoloration or degradation is elongated to the double of only wet hard-coat by combination with CVD method.

About Teijin Group

Teijin is a technology-driven global group offering advanced solutions in the areas of sustainable transportation, information and electronics, safety and protection, environment and energy, and healthcare. Its main fields of operation are high-performance fibers such as aramid, carbon fibers & composites, healthcare, films, resin & plastic processing, polyester fibers, products converting and IT. The group has some 150 companies and around 16,000 employees spread out over 20 countries worldwide.

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Source: Teijin Group
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