Patent ID: 7563289

Claim:
Compounds of formula (1) wherein R 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; Y is the residue of an organic dye which corresponds to the formula wherein R 2 is hydrogen; or C 1 -C 5 alkyl; R 3 is a radical of formula or R 2 and R 3 together with the linking carbon atom 1 C form a 6 to 10 membered carbocyclic ring which may optionally be a condensated aromatic system and may contain one or more than one hetero atom; and R 4 , R 5 and R 6 independently form each other are hydrogen, or C 1 -C 5 alkyl; Z is a thio ester group of formula wherein A is O; S; or N—R 9 ; B is —OR 7 ; —NR 7 R 8 ; or —SR 7 ; and R 7 , R 8 and R 9 , 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.