1,7-Diaroxy- or 1,7-arylthio-substituted perylene-3,4,9,10-tetracarboxylic acids, their dianhydrides and diimides

A 1,7-disubstituted perylene-3,4,9,10-tetracarboxylic diimide of the general formula VI:

• where
• R is aryloxy, arylthio, hetaryloxy or hetarylthio each of which can be substituted one or more times by C1-C30-alkyl whose carbon chain can be interrupted by one or more groups —O—, —S—, NR1—, —CO— and/or —SO2— and/or can be substituted one or more times by —COOR1, —SO3R1, hydroxyl, cyano, C1-C6-alkoxy, C5-C8-cycloalkyl or a 5- to 7-membered heterocyclic radical which is attached via nitrogen and can contain further heteroatoms, or can be substituted one or more times by C1-C6-alkoxy, cyano, —COOR1 or —SO3R1, where R1 is hydrogen or C1-C6-alkyl, and
• R2 is C4-C30-alkyl whose carbon chain can be interrupted by one or more groups —O—, —S— or —CO—, or is C5-C8-cycloalkyl or aryl which can be substituted one or more times by a C1-C6-alkyl or a C1-C6-alkoxy.