Patent ID: 7906039

Claim:
A fluorescent diketopyrrolopyrrole of the formula I wherein R 1 and R 2 may be the same or different and are a C 1 -C 25 alkyl group which can be substituted by fluorine, chlorine or bromine, an allyl group which can be substituted one to three times with C 1 -C 4 alkyl, C 5 -C 12 cycloalkyl group which can be substituted one to three times with C 1 -C 8 alkyl and/or C 1 -C 8 alkoxy, a C 5 -C 12 cycloalkyl group condensed one or two times by phenyl which can be substituted one to three times with C 1 -C 4 -alkyl, halogen, nitro or cyano, an alkenyl group, a cycloalkenyl group, an alkynyl group, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, an aldehyde group, an ester group, a carbamoyl group, a ketone group, a silyl group, a siloxanyl group, A 3 or —CR 3 R 4 —(CH 2 ) m -A 3 wherein R 3 and R 4 independently from each other stand for hydrogen or C 1 -C 4 alkyl, or phenyl which can be substituted one to three times with C 1 -C 4 alkyl, A 3 stands for aryl or heteroaryl which can be substituted one to three times with C 1 -C 8 alkyl and/or C 1 -C 8 alkoxy, and m stands for 0, 1, 2, 3 or 4, A 1 and A 2 are independently of each other wherein R 5 , R 6 , and R 7 may be the same or different and are selected from a hydrogen atom, a C 1 -C 25 alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, a cycloalkenyl group, an alkynyl group, a hydroxyl group, a mercapto group, an alkoxy group, an alkylthio group, an aryl ether group, an aryl thioether group, an aryl group, a heterocyclic group, a halogen atom, a haloalkyl group, a haloalkenyl group, a haloalkynyl group, a cyano group, an aldehyde group, a carboxyl group, an ester group, a carbamoyl group, a nitro group, a silyl group, a siloxanyl group, a substituted or unsubstituted vinyl group, a group NR 8 R 9 , wherein R 8 and R 9 independently of each other stand for a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, a heteroaryl group, a heterocyclic group, an aralkyl group, or R 8 and R 9 together with the nitrogen atom to which they are bonded form a five or six membered heterocyclic ring, which can be condensed by one or two optionally substituted phenyl groups, or at least two adjacent substituents R 5 to R 7 form an aromatic or aliphatic fused ring system, and X 1 is a hydrogen atom, a C 1 -C 25 alkyl group, a cycloalkyl group, an aralkyl group, an aryl group, or a heterocyclic group, wherein at least one of the groups R 5 , R 6 , and R 7 is different from a hydrogen atom, if A 1 and A 2 are with the proviso that R 5 , R 6 , and R 7 are not NR 8 R 9 when A 1 and A 2 are and with the further proviso, that the following compounds are excluded,