2. Chemistry of non-PVB interlayers for laminated glass

2.1 Ethylene vinyl acetate (EVA) resins and films

• General

  In the early 1950s, a number of chemical groups were involved in the development of EVA (ethylene vinyl acetate) copolymers. Imperial Chemical Industry (ICI) – since acquired by Akzo Nobel – filed the first EVA patent in 1950 and began marketing the product. Dupont also filed a patent in 1956 and introduced the "Elvax" product range in 1960. Since then, the main producers of EVA copolymers have been Bridgestone, Dupont, Exxon Mobil Chemicals and many others. When it comes to encapsulating cells for photovoltaic modules, the names of Bridgestone ("Evasky ^® " product range), Sekisui ("S-LEC"), Tohso ("Nippoflex"), Dupont ("Elvax...