Oxime ester photoiniators having a combined structure

摘要

Compounds of the formulae I, II and III wherein R₁ is for example hydrogen, C₃-C₈cycloalkyl, C₁-C₁₂alkyl, phenyl unsubstituted or substituted; R₂ and R₂' for example are hydrogen, C₁-C₂₀alkyl, C₃-C₈cycloalkyl or phenyl, unsubstituted or substituted, or are Ar₁ is for example phenyl, optionally substituted by e.g. Ar₂ is for example phenylene, optionally substituted e.g. by -(CO)R₇, (D), (E) or (F); Ar₃ is for example phenyl; M₁, M₂ and M₃ are, for example, C₁-C₂₀alkylene; M₄ is for example direct bond, -O-, -S-, -Y-(C₁-C₁₀alkylene)-Y'-, optionally substituted; Y and Y' are for example a direct bond or -O-; R₇ is for example hydrogen, C₁-C₂₀alkyl or phenyl, optionally substituted; R₈, R₉, R₈' and R₉' are for example hydrogen or C₁-C₁₂alkyl, exhibit an unexpectedly good performance in photopolymerization reactions.