| abstract |
Naphtholactam dyes of the formula in the R¹ and R³ / DL> are the same or different and, independently of one another, each optionally substituted and / or interrupted by C₁-C₂₀-alkyl, optionally substituted C₅-C₇-cycloalkyl or optionally substituted phenyl, R², R⁴ and R⁵ are identical or different and are each independently hydrogen, optionally substituted C₁-C₆-alkyl, optionally substituted C₅-C₆-cycloalkyl, optionally substituted phenyl, C₁-C₆-alkoxycarbonyl, C₁-C₆-carboxyalkyl, hydroxy, C₁-C₄-alkoxy or Halogen, n 0 or 1 p regardless of n 0, 1 or 2 Z¹ and Z² in each case hydrogen or, if n is 1, together also a C₂-C₃ alkylene chain optionally substituted by C₁-C₄-alkyl or one or two carbonyl groups and x⊖ mean an anion, and in the the rings A, B, C and D are optionally substituted or benzo-fused, with the proviso that if a) the rings A, B, C and / or D are unsubstituted or substituted by halogen, C₁-C₄-alkoxy, C₁-C₄-mono- or dialkylamino or nitro, n and p are not simultaneously 0, b) the rings A, B, C and / or D are unsubstituted or substituted by halogen, C₁-C₄-alkoxy, C₁-C₄-mono- or dialkylamino or nitro and n for 1, p for 0 and Z¹ and Z² each for Are hydrogen, R² does not mean hydrogen, c) the rings A, B, C and / or D are unsubstituted or substituted by halogen, C₁-C₄-alkoxy, C₁-C₄-mono- or dialkylamino or nitro and n are 0 and p are 1 or 2, R⁴ and R⁵ do not simultaneously mean hydrogen and d) the rings A, B, C and / or D are unsubstituted or substituted by halogen, C₁-C₄-alkoxy, C₁-C₄-mono- or dialkylamino or nitro and n and p each for 1 and Z¹ and Z² each for hydrogen stand, at least one of the radicals R², R⁴ and R⁵ is not hydrogen, and an optical recording medium containing at least one naphtholactam dye and optionally a carrier. |