This presentation, given at uv/eb west 2009, shows accelerated weathering results of wood coatings and also explains the unique method of curing coatings with sunlight.

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Allophanate technology leads to significantly reduce viscosity in urethane acrylates. This was presented at Radtech 2008.

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Considering the pros and cons of these two technologies, it is evident, that the limitations of PUR– as well as radiation curing coatings can be overcome by an advantageous combination of both, by dual-cure formulations. Dual-cure formulations are taken here to mean those that crosslink by radical initiated photopolymerisation and an additional reaction of polyisocyanates.

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Presented at the UV & EB Technology Expo and Conference in 2006. This paper describes new development work with unique waterborne one- component cosolvent free UV-curable polyurethane dispersions, that can be formulated to make both clear and pigmented exterior coatings. A key conclusion is that many of the issues inherent with 100% UV can be overcome by using waterborne UV PUDs. Waterborne UV PUDs are supplied in water and comprised of very high molecular weight polymers. This significantly reduces the risk for both skin irritation and spray application hazards.

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Presented at the UV & EB Technology Expo and Conference in 2006. There are many advantages associated with radical cure of coatings: rapid rate of cure, significant energy savings, low/no VOCs, and one-component formulations. However, a disadvantage of solvent-based UV curable resins is their susceptibility to shrinkage, which leads to embrittlement. An interesting alternative exists in waterborne radical cure resins. In general, polyurethane dispersions (PUD) are highly valued for their superior mechanical properties. Coatings from non-functional, fully reacted PUDs tend to be less chemically resistant than solvent-based polyurethane coatings due to the lack of crosslinking. UV-curable PUDs (UV PUD) provide additional strength and chemical resistance from the crosslinking of acrylate functionality built into the urethane backbone. These UV PUDs do not exhibit shrinkage like the corresponding solvent- based radical cure systems can. Thus, they represent a well-balanced blend of mechanical properties and chemical resistance, with the previously mentioned advantages that radical cure offers.

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Learn about advancements in UV-curable coatings for automotive refinish. This presentation was given at the 2008 Radtech trade show.

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This presentation, given at uv/eb west 2009, explains Bayer MaterialScience's developments in UVA Cured black coatings for direct to metal applications.

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Presented at the UV & EB Technology Expo and Conference in 2006. This presentation reviews new developments in UV-curable clearcoat chemistry for the automotive refinish market.

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A technical review of the development of UV cure coatings for application on metal substrates.

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This video, authored by Alan Bushmire, demonstrates how a one component UV-A curable system can repair a damaged composite substrate within minutes.

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In common perception, UV-cured coatings are associated with properties like high hardness and abrasion resistance. They are often used in applications such as flooring that require only a limited amount of flexibility. Urethane acrylate chemistry offers the freedom to design coating raw materials with elastomeric properties. To date, most commercial urethane acrylates have tensile elongation values below 50% and only very few products were reported with values of approximately 100%. We investigated the syntheses of elastomeric urethane acrylates. Samples with elongation at break values of 500 % and more were produced. Their physical properties, aspects of formulation and applications will be discussed.

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This technical article shows that the proper choice of resins, the UV equipment, and photoinitiator allows acceptable curing of wood coatings as thick as 11.8 mils and with pigment-to-binder ratio of up to 0.3.

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A presentation by RadTech International North America, a non-profit industry organization that advances UV technology, about the advantages and safety requirements for UV coatings in repairing automotive finishes.

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The development of refinish formulations offered an ideal opportunity to utilize high-throughput methodology. There are many material and process variables that contribute to the properties of a UV-A curable coating, making the parameter space quite extensive. Arrays of formulations can be rapidly assessed for one or two key properties that determine the success or failure of a particular combination of variables. With the UV primer for example, these key tests were for surface and through cure. The best candidates from the large primary screening were then optimized via traditional techniques for other important characteristics.

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This presentation summarizes a Bayer study. The addition of self- crosslinking polyurethane dispersions (PUDs) shows a positive synergistic effect with UV-Curable PUDs when cured with low intensity UV-A lamps.

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This presentation, given at uv/eb west 2009, explains Bayer MaterialScience's developments in UV cured composite repair.

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Waterborne UV-curing coatings for furniture have now enjoyed significant market acceptance for a number of years, in particular in industrial furniture coating. Their most significant improvement over the conventional state of the art, besides their low VOC content, is their high productivity. Recent developments show that UV-curing coatings formulations can also be used very effectively with pigmented coatings and not just with clear varnishes. The products discussed here combine very rapid drying with high property levels. The effects of adding waterdispersible polyisocyanates to such coatings are also presented.

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