Patent ID: 7105674

Claim:
A perylene derivative represented by the formula I: wherein X and Y are independently oxygen, —NR 1 or —NR 2 , with the proviso that X or Y is oxygen and X and Y are not both oxygen; R 1 and R 2 are independently hydrogen, C 1 –C 18 -alkyl, C 5 –C 7 -cycloalkyl, aryl or C 1 –C 6 -alkoxy; R 3 to R 10 are independently hydrogen, hydroxyl or aryl, although radicals conjointly attached to one carbon atom may also represent ═O or ═CHR 11 ; and R 11 is hydrogen or C 1 –C 3 -alkyl; with the proviso that said perylene derivative contains 1 to 3 carbonyl groups per molecule.