| abstract |
A photopolymerisable material comprising a light-sensitive layer that contains monomers, binders and a photoinitiator system, and optionally other auxiliary layers, contains as photoinitiator system a water-soluble photo-initiator system comprising (i) a betaine structure-forming component of the formula I, (ii) a compound of the formula II and (iii) an onium compound, e.g. of the formula III, On<+> Y<->. |