Bathochromic mono- and bis-acylphosphine oxides and sulfides and their use as photoinitiators

摘要

Compounds of formula (I), wherein A is S or O; x is 0 or 1; a is SR₁₀ or N(R₁₁)(R₁₂); R₁ and R₂ are C₁-C₂₄alkyl, OR₁₀, CF₃ or halogen; R₃, R₄ and R₅ are hydrogen, C₁-C₂₄alkyl, OR₁₀ or halogen; or two of the radicals R₁₁ R₂₁ R₃₁ R₄ and/or R₉ together form C₁-C₂oalkylene uninterrupted or interrupted by O, S or NR₁₃; R₆, R₁₁ R₈ and R₉ are hydrogen, C₁-C₂₄alkyl; C₂-C₂₄alkyl which is interrupted one or more times by non-consecutive O atoms and unsubstituted or substituted by OH and/or SH, or R₆, R₇, R₈ and Rg are OR₁₀; halogen; or phenyl unsubstituted or substituted one or more times by C-Calkyl; R₁₀, R₁₁ and R₁₂ are e.g. hydrogen; X is e.g. (II), and R₂; have one of the meanings given for R₁ and R₂; and R₃', R₄' and Rs' have one of the meanings given for R₃, R₄ and R₅; are suitable as photoinitiators, especially for irradiation with light of relatively long wavelengths