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New Primer For the Hardcoating of Polycarbonate

Published on 2008-06-06. Author : SpecialChem

Leverkusen -- Leverkusen-based Momentive Performance Materials GmbH is in the process of developing SHP 470 FT 2050, a new primer system for the hardcoating of black-pigmented polycarbonate. Components used in exterior applications enjoy excellent weathering resistance, when coated with the developmental product. "We found that this primer is also very compatible with AS 4700, an established Momentive topcoat for polycarbonate applications. The primer is also much easier to apply than the products used previously. Trials with our Makrolon® AG2677, a transparent polycarbonate tailored for automotive glazing, support these claims," said Volkhard Krause, global Head of the Automotive Glazing Team at Bayer MaterialScience. This new development benefits, in particular, large automotive panorama roofs, which can be hardcoated more easily and more economically.

A normally two-layer hard coat is used to make polycarbonate automotive glazing resistant to weather and scratching. Applied first is a primer which ensures optimum adhesion of the topcoat applied thereafter. AS 4700, a polysiloxane-based topcoat, is currently used to coat sheets of Makrolon® AG2677 in numerous applications. With identical application conditions and solids content, the new primer offers significantly better weather resistance than formulations with the primers used previously. For unchanged weatherability requirements, the reduced solids content of these hard coats makes them significantly easier to apply. "The new primer gives producers of automotive glazing made from Makrolon® AG2677 greater flexibility with respect to the hardcoating of their components," said Krause.

Bayer MaterialScience offers manufacturers of automotive glazing made of Makrolon® AG2677 a comprehensive package of service, know-how and products. This includes special infrared absorbers tailored to the polycarbonate to ensure optimum thermal protection of the interior. Also offered are custom polycarbonate blends from the Makroblend® and Bayblend® product lines in which shrinkage behavior and other mechanical properties have been adapted to the high-tech polycarbonate. This makes them particularly suitable as frame materials for complex glazing assemblies based on the polycarbonate, such as rear windows and panorama roofs.

Momentive Performance Materials is a subsidiary of Momentive Performance Materials Inc. The U.S. company based in Wilton, Connecticut, is among the world's leading suppliers of silicones and their derivatives, and is the global leader in the production and development of quartz and specialty ceramics.

About Bayer MaterialScience:

With 2007 sales of EUR 10.4 billion, Bayer MaterialScience is among the world's largest polymer companies. Business activities are focused on the manufacture of high-tech polymer materials and the development of innovative solutions for products used in many areas of daily life. The main segments served are the automotive, electrical and electronics, construction, and sports and leisure industries. At the end of 2007, Bayer MaterialScience had 30 production sites and employed approximately 15,400 people around the globe. Bayer MaterialScience is a Bayer Group company.

Source: Bayer MaterialScience

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