Photoinitiators are substances that form free radicals when they are exposed to UV light, and these radicals initiate polymerization reactions. Irgacure 270 is a new high-molecular-weight sulfonium salt which fulfills the high standards that UV-curable inks for food packaging are required to meet. Extensive tests have shown that emissions and migration are both very low.
Irgacure 270 is mainly employed in UV-curable applications that demand low emissions. These include clear overprint varnishes, flexographic inks, screen inks and inkjet inks for printing food packaging made from a variety of substrates such as paperboard, plastics and metal.