Isothiouronium salts as photographic nucleating agents

摘要

The inclusion of isothiouronium functionality onto hydrazide derivatives results in the formation of nucleating agents for lithographic films that produce high contrast and speed with excellent dot quality as required for halftone applications. The level of performance of the nucleators of the invention is sufficiently high that the need to incorporate amine boosters in the lithographic film elements or developers is not required. The novel nucleators have the formula <IMAGE> wherein R is hydrogen, C1-C10 alkyl, substituted or unsubstituted carbamoyl, or alkoxy or aryloxy carbonyl; Y is substituted or unsubstituted divalent aryl, and Q is an isothiouronium salt moiety.