New -aminoacetophenone photoinitiators and photopolymerizable compositions comprising these photoinitiators

摘要

Compounds of the formulae I, II, III and IV wherein Ar for example is a phenyl, biphenyl or benzoylphenyl group, which is unsubstituted or substituted; Ar1, for example, has the same meanings as Ar; Ar2 is inter alia phenyl; X may be a direct bond; Y hydrogen, etc.; R1 and R2 for example C1-C8alkyl; R3 inter alia hydrogen or C1-C12alkyl; R4 is inter alia C1-C12alkyl; or R3 and R4 together are C3-C7alkylene; R5 is for example C1-C6alkylene; and Z is a divalent radical; provided that at least one of the radicals Ar, Ar1, Ar2, Ar3, R1, R2, R3, R4, R5 or Y is substituted by 1 to 5 SH groups, or provided that Y contains at least one -SS- group, are photoinitiators for the polymerization of ethylenically unsaturated compounds.