Abstract
In addition to other technologies, i.e. high-solids, waterborne and powder coatings, UV curable coatings are also certain to play an important role in the coating industry's future, especially as a means of overcoming solvent emission limitations and energy savings. In principle, ultraviolet curable coatings can be used in all applications as long as the performance requirements are fulfilled. One of the most important requirements for a broad use of UV curable coatings in the coating industry is that coatings are stable against degradation caused by atmospheric influences. This weathering leads to a degradation of the polymeric binder. With novel photoinitiators based on bis-acylphoshinoxides (BAPO) it is possible to cure clearcoats containing a combined UV-absorber/HALS light stabilizer package. These clearcoats show both a very good curing behaviour and an improved weather-fastness over a long period of time.
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