radiation - sensitive organo - halogen compounds having a photo - labile halomethyl - 1 , 3 , 5 - triazine moiety and at least one amine - containing moiety within one molecule . the compounds serve the dual purpose of photoinitiation and polymerization acceleration , thereby eliminating the need for the use of two separate compounds . the compounds of this invention are good photoinitiators , and compositions containing them are useful in printing , duplicating , copying , and other imaging systems .