Patent ID: 6986811

Claim:
A perylene derivative of the formula (I) where A has the definition O, CH 2 or NR 1 with R 1 being H, aryl, aralkyl, heteroaryl, cycloalkyl, C 1 –C 22 alkyl, Y, each identical or different, is —CO 2 , —CONR 2 , —SO 3 or —SO 2 NR 2 , R 2 being H, aryl, aralkyl, heteroaryl, cycloalkyl, C 1 –C 22 alkyl, alkylamine, in which the amine function may carry one or more further substituents and may be part of a polyamine, X, each identical or different, is bonded covalently to the perylene derivative and is selected from the group consisting of sterically stabilizing substituents and electrostatically stabilizing substituents, at least one X being selected from the sterically stabilizing substituents, Z, each identical or different, represents where present one or more further substituents, selected from the group consisting of alkyl, alkoxy, and aryloxy groups and halogens, n is an integral number greater than or equal to 1, and m is an integral number greater than or equal to 0; and wherein the sterically stabilizing substituents are selected from the group consisting of polymers based on alkylene oxides, polymers based on polyesters, polymers based on polyacrylates, polymers based on alkyl sulfides, and polymers based on alkyl compounds.