| abstract |
Sulfonium salts of the general formula <IMAGE> where R1, R2 and R3 are identical or different and are aliphatic and/or aromatic radicals which may contain heteroatoms, or two of the radicals R1 and R3 are bonded to one another to form a ring, with the proviso that one or more of the radicals R1 to R3 contain one or more acid-cleavable groups, or one of the radicals R1 to R3 is bonded to one or more further sulfonium salt radicals, if desired via acid-cleavable groups, and X(-) is a non-nucleophilic counter-ion, are suitable as photoinitiators for cationic polymerization. |