Thianthrenium salt cationic photoinitiators

摘要

Triarylsulfonium salts of formula I or II are useful as initiators for cationic photopolymerizations: wherein Ar¹ and Ar² are independently polycyclic aryl, substituted aryl, heteroaryl, substituted heteroaryl, or aryl or heteroaryl, pendant from a polymer chain; and MtX_n^- is a complex anion selected from PF₆^-, SbF₆^-, AsF₆^-, GaF₆^-, BF₄^-, (C₆F₅)₄B^- and CF₃SO₂)₃C^-.