Patent ID: 7803197

Claim:
Compounds of formula (1) wherein L 1 is hydrogen; C 1 -C 12 alkyl; or phenyl-C 1 -C 4 alkyl; X is C 1 -C 12 alkylene, C 2 -C 12 alkenylene, C 5 -C 10 cycloalkylene, C 5 -C 10 arylene, or C 5 -C 10 arylene-C 1 -C 10 alkylene, which may by interrupted by —O—, —NH—, —S—, —CO—, or —SO 2 —; Y is the residue of an organic dye; Z is a group of formula or —C≡N; wherein A is O; S; or N-L 2 ; B is L 3 , —OL 3 ; —NL 3 L 4 ; or —SL 3 ; and L 2 , L 3 and L 4 , independently from each other are hydrogen; C 1 -C 12 alkyl; C 6 -C 12 aryl; or C 6 -C 12 aryl-C 1 -C 12 alkyl.