Diphenyl(4-phenylthiophen-2-yl)sulfonium Triflate
Diphenyl(4-phenylthiophen-2-yl)sulfonium Triflate (CAS: 111281-12-0) is a triarylsulfonium salt functioning as a high-performance photoinitiator for cationic UV curing systems. Upon exposure to ultraviolet light, this compound undergoes photolysis generating strong Brønsted acid species that initiate polymerization of epoxides, vinyl ethers, and other cationically curable monomers. Unlike radical photoinitiators, cationic systems employing this sulfonium salt offer oxygen inhibition resistance, low shrinkage, and continued dark curing after UV exposure. It is extensively used in high-speed printing inks, clear and pigmented coatings, adhesives, and electronic encapsulants requiring rapid, deep curing. The triflate counterion provides excellent solubility and thermal stability in formulated systems. With its high quantum yield and compatibility with diverse monomer systems, this photoinitiator enables efficient production of coatings, composites, and microelectronic devices through UV curing technology.
– UV Curing Inks and Coatings: Used as a photoinitiator in offset, flexo, and screen inks enabling instant curing for high-speed printing operations.
– Cationic Epoxy Systems: Serves as the acid generator for curing cycloaliphatic epoxies in coatings, adhesives, and composite matrices with low shrinkage.
– Electronic Encapsulation: Applied in photoimaging, photoresists, and encapsulating adhesives for semiconductor packaging and PCB fabrication.
– 3D Printing and Stereolithography: Employed in rapid prototyping resins requiring precise, high-resolution photopolymerization.
Product Name: Diphenyl(4-phenylthiophen-2-yl)sulfonium Triflate
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