Some of these systems use maleic anhydride (MA) derivations or maleimides (made from maleic anhydrides), tertiary amines, and an UV absorbent cosynergist (3).
Abstract Isopropylthioxanthone is a popular cosynergist for Type II and three-component photoinitiators used to photopolymerize ultraviolet (UV) curable coatings and can be used in the presence of maleic anhydride derivatives to efficiently cure coatings used in numerous applications.
Keywords Isopropylthioxanthone, Maleic anhydride, Photoproduct, Kinetics, Photoinitiator
One of these systems includes isopropylthioxanthone (ITX), 2,3-dimethyl maleic anhydride (DMMA), and N-methyl-N,N-diethanolamine (MDEA) (4).
From the calculated rate law for photoproduct formation, the effect on the rate of photo-initiation could be significant enough to explain the observed rate reduction of maleic anhydride-based three-component photoinitiators relative la similar maleimide-based photoinitiators which contradicts theory saying that better electron acceptors (e.g., maleic anhydride derivatives) should increase the polymerization rate.