| abstract |
On press developable negative-working, on-press developable imageable elements have improved printout qualities with an incorporated infrared radiation absorbing compound that has a cyanine dye chromophore that is represented by the following Structure (CHROMOPHORE): n n n n n n n n n n wherein one or both of Q 1 and Q 2 are independently substituted or unsubstituted acyl groups —(C═O)—R 3 ′ and —(C═O)—R 4 ′ respectively, wherein R 3 ′ and R 4 ′ are independently substituted or unsubstituted alkyl or aryl groups, or they are joined together to form a ring structure, or one of Q 1 and Q 2 is hydrogen and the other is a substituted or unsubstituted acyl group, A and A′ are independently —S—, —O—, —NH—, —CH 2 —, or —CR′R″— groups wherein R′ and R″ are independently substituted or unsubstituted alkyl groups, or R′ and R″ together can form a substituted or unsubstituted cyclic group, Z represents the carbon atoms needed to form a 5- to 7-membered carbocyclic ring, Z 1 and Z 2 are independently substituted or unsubstituted benzo or naphtho condensed rings, and R 1 ′ and R 2 ′ are independently substituted or unsubstituted alkyl, cycloalkyl, or aryl groups. |