OXIME ESTER PHOTOINITIATORS

摘要

Compounds of the formula (I) and (II) M₁, M₂ and M₃ independently of one another are no bond, a direct bond, CO, O, S, SO, SO₂ or NR₁₄; provided that at least one of M₁, M₂ or M₃ is a direct bond, CO, O, S, SO, SO₂ or NR₁₄; M₄ is a direct bond, CR"₃R"₄, CS, O, S, SO, or SO₂; Y is S or NR₁₈; R₁ for example is hydrogen, C₃-C₈cycloalkyl, phenyl or naphthyl, both of which are optionally substituted; R₂ for example is C₁-C₂₀alkyl; R"₂ has one of the meanings given for R₂; R₃ and R₄ are for example hydrogen, halogen, C₁-C₂₀alkyl; R'₃, R'₄, R"₃ and R"₄ indepedently of one another have one of the meanings given for R₃ and R₄; and R₅ is for example hydrogen, halogen, C₁-C₂₀alkyl; provided that in the compounds of the formula (I) at least two oxime ester groups are present and provided that at least one specified substituent R₂ or R"₂ is present; exhibit an unexpectedly good performance in photopolymerization reactions.