Perylene-3,4-dicarboximides of Formula (I) wherein R1 may be C1-C20alkyl, C3-C14cycloalkyl, C1-C20alkoxy, phenyl, phenyloxy or phenylthio, where phenyl may in each case be mono- or polysubstituted by halogen, C1-C20alkyl, C3-C14cycloalkyl and/or C1-C20alkoxy; -NR62 or -OR6, wherein R6 is hydrogen or C1-C20alkyl, and R2, R3, R4 and R5 may be each independently of one another hydrogen, halogen, C1-C20-alkyl, C3-C14cycloalkyl, C1-C20alkoxy, phenyl, phenyloxy or phenylthio, where phenyl may in each case be mono- or polysubstituted by halogen, C1-C20alkyl, C3-C14cycloalkyl and/or C1-C20alkoxy; -NR62 or -OR6, and a process for their preparation and use.
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