| abstract |
A photoacid generator which does not contain a toxic metal and contains a sulfonium salt or a sulfonium salt thereof having a cationic polymerization performance or a crosslinking reaction performance over a tetrakis (pentafluorophenyl) borate salt, and a cured product (An acid generator), which does not cause corrosion of the member and does not cause a problem of deterioration of transparency due to deterioration of the resin, because the strong acid does not remain after the heat resistance test in particular, provides an energy ray curable composition and a cured product do. The present invention relates to a sulfonium salt comprising a sulfonium cation selected from the group consisting of the following formulas (1), (2) and (3) and a gallate anion represented by the formula (a) , An energy ray-curable composition containing the photoacid generator and a cationic polymerizable compound, and a cured product obtained by curing the composition. |