DIAZOTYPE MATERIAL AND GRAPHIC REPRODUCTION PROCESSES EM- PLOYING THE SAME

摘要

A diazotype material, which comprises a supported light-sensitive layer comprising a light-sensitive, water-insoluble diazoimino compound of the formula: IMAGE wherein R is an aryl group and R1 and R2 are organic radicals, which may be the same or different, or R1 and R2 together with the nitrogen atom to which they are attached form a heterocyclic group, an azo coupler, and an alkaline material, said diazoimino compound, when exposed to ultraviolet light, being reactive with said azo coupler to form a visible dye product only at a pH greater than 7. The diazotype material can be used for diazotype reproduction processes resulting in negative or direct positive images.