Diazotype material and graphic reproduction processes employing the same
AssigneeGAF Corporation
InventorHenry Mustacchi
Life of this patent
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Abstract
A diazotype material, which comprises a supported light-sensitive layer comprising a light-sensitive, water-insoluble diazoimino compound of the formula: ##STR1## wherein R is an aryl group and R.sub.1 and R.sub.2 are organic radicals, which may be the same or different, or R.sub.1 and R.sub.2 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.
Claims38
A diazotype material, which comprises a supported light-sensitive layer comprising a light-sensitive, water-insoluble diazoimino compound of the formula reactive ##STR7## wherein R is an aryl group and R.sub.1 and R.sub.2 are organic radicals, which may be the same or different, or R.sub.1 and R.sub.2 together with the nitrogen atom to which they are attached form a 4 to 7 membered 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.
Dependencies are inferred from the claim text.