Abstract
There is nowadays an increasing demand for low VOC systems in automotive refinish industry. These systems should also cure sufficiently fast at ambient temperature in order to reduce the investment in drying equipment and the time of repair. However, matching the stringent chemical and mechanical requirements associated with medium solid systems, and reaching a VOC level <420 g/l (from UK and Dutch legislation) is a challenge, especially if the coatings are cured at room temperature. Extensive research has been carried out on high solids resins making use of CARDURA 1 CARDURA and VERSATIC acids are trademarks of the Royal Dutch/Shell Group of Companies. 1 E10 (the glycidyl ester of VERSATIC acid) in conjunction with acrylic and methacrylic monomers. The efficient use of these building blocks allowed the cost-effective production of resins matching all coating requirements at a VOC level below 420 g/l after cure at ambient as well as elevated temperatures. These ambient cure clear coat systems exhibit a very good overall performance and should therefore form a good starting point for very high solids acrylic–urethane coatings for automotive refinish applications.
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