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The amount of propylene carbonate (PC) in commercial cationic photoinitiator (P1) mixtures has
been associated with some applications issues including 1 and PC migration from cured . A
new experimental higher-solids P1 mixture was developed which contained less PC in an attempt to address these concerns. Some of the PC in the standard P1 was replaced using liquid epoxy resin 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl carboxylate (ECC). The experimental higher-solids P1 mixture, UVIX-404020, contained approximately 40 wt.% mixed triaryl sulfonium hexafluorophosphate salts, 40 wt.% ECC, and 20 wt.% PC. This study was conducted to determine performance differences between UVIX-404020 and a control P1 in rigid and flexible packaging applications. The performance of UVIX-404020 and the control P1 were compared when they were used at the same sulfonium salt concentrations in test formulations.
