Novel anthraquinone-based nir absorbers

A compound of the formula

• wherein
• Y1, Y2, Y3 and Y4 are O, or one of Y1 and Y2 is O and the other is NR13 and one of Y3 and Y4 is O and the other is NR1, wherein R13 has the meaning of R1;
• especially
• wherein
• R1 and R2 are independently of each other selected from hydrogen, C1-C24-alkyl, C1-C24-haloalkyl, C3-C24-cycloalkyl, C6-C10-aryl and C6-C10-aryl-C1-C10-alkylene, where the rings of cycloalkyl, aryl, and aryl-alkylene in the three last-mentioned radicals are unsubstituted or substituted with one or more substituents R11, and where C1-C24-alkyl, C1-C24-haloalkyl and the alkylene moiety of C6-C10-aryl-C1-C10-alkylene may be interrupted by one or more heteroatoms or heteroatomic groups selected from O, S and NR12;
• R3, R4, R5, R6, R7, R8, R9 and R10 are independently of each other selected from hydrogen, C1-C24-alkyl, C1-C24-haloalkyl, C3-C24-cycloalkyl, heterocycloalkyl, hetaryl, C6-C10-aryl and C6-C10-aryl-C1-C10-alkylene, where the rings of cycloalkyl, aryl, and aryl-alkylene in the three last-mentioned radicals are unsubstituted or substituted with one or more substituents R11′, and where C1-C24-alkyl, C1-C24-haloalkyl and the alkylene moiety of C6-C10-aryl-C1-C10-alkylene may be interrupted by one or more heteroatoms or heteroatomic groups selected from O, S and NR12′;
• each R11 is selected from C1-C24-alkyl, C1-C24-fluoroalkyl, C1-C24-alkoxy, fluorine, chlorine or bromine;
• each R11′ is selected from C1-C24-alkyl, C1-C24-fluoroalkyl, C1-C24-alkoxy, fluorine, chlorine or bromine;
• and
• R12 and R12′ are independently of each other hydrogen, C1-C20-alkyl, C3-C24-cycloalkyl, heterocycloalkyl, hetaryl or C6-C10-aryl.