Patent ID: 6890377

Claim:
A rylene dye of formula I where R is hydrogen; C 1 -C 30 -alkyl, whose carbon chain may be interrupted by one or more —O—, —S—, —NR 1 —, —CO— and/or —SO 2 — groups and which may be monosubstituted or polysubstituted by cyano, C 1 -C 6 -alkoxy, aryl, which may be substituted by C 1 -C 18 -alkyl or C 1 -C 6 -alkoxy, and/or a 5- to 7-membered heterocyclic radical which is bonded via a nitrogen atom and may contain further heteroatoms and may be aromatic; aryl or hetaryl, each of which may be monosubstituted or polysubstituted by C 1 -C 18 -alkyl, C 1 -C 6 -alkoxy, cyano, —CONHR 2 , —NHCOR 2 and/or aryl- or hetarylazo, each of which may be substituted by C 1 -C 10 -alkyl, C 1 -C 6 -alkoxy and/or cyano; R′ is C 2 -C 30 -alkyl, whose carbon chain may be interrupted by one or more —O— and/or —CO— groups and which may be monosubstituted or polysubstituted by cyano, C 1 -C 6 -alkoxy, C 5 -C 8 -cycloalkyl, whose carbon skeleton may be interrupted by one or more —O—, —S— and/or —NR 1 — groups and which may be C 1 -C 6 -alkyl-substituted, aryl, which may be substituted by C 1 -C 18 -alkyl or C 1 -C 6 -alkoxy, and/or a 5- to 7-membered heterocyclic radical which is bonded via a nitrogen atom and which may contain further heteroatoms and which may be aromatic; methyl, which is monosubstituted or disubstituted by aryl, hetaryl and/or C 5 -C 8 -cycloalkyl, each of which may be substituted by C 1 -C 18 -alkyl or C 1 -C 6 -alkoxy; C 5 -C 8 -cycloalkyl, whose carbon skeleton may be interrupted by one or more —O—, —S— and/or —NR 1 — groups and which may be monosubstituted or polysubstituted by C 1 -C 6 -alkyl; R 1 is hydrogen or C 1 -C 6 -alkyl; R 2 is hydrogen; C 1 -C 18 -alkyl; aryl or hetaryl, each of which may be substituted by C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy and/or cyano; n is 2 or 3.