Peresters of the formula: R.sub.1 Ar COOOR wherein R is an alkyl group; Ar is selected from the group including phenyl (unsubstituted or substituted) groups, naphthyl groups, anthryl groups, pyryl groups, phenanthryl groups, or heterocyclic groups; and R.sub.1 is any group absorbing radiation between...http://www.google.es/patents/US4831188?utm_source=gb-gplus-sharePatente US4831188 - Perester photoinitiators
