Process for the manufacture of diazotype copies

Claim 1

A PROCESS FOR THE PRODUCTION OF DIAZOTYPE COPIES WHICH COMPRISES SELECTIVELY EXPOSING TO LIGHT A ONE-COMPONENT DIAZO FILM LAYER MATERIAL SO THAT THE DIAZO COMPONENT THEREIN IS ONLY PARTICALLY DECOMPOSED AT CERTAIN AREAS OF SAID MATERIAL, SAID MATERIAL COMPRISING A DIAZO FILM LAYER THAT IS SUITABLE FOR DEVELOPMENT WITH A LIQUID AND CONTAINS A FILM FORMING MATERIAL AND A P-AMINO BENZENE DIAZO COMPOUND THAT YIELDS AN ACTIVE PHOTOCHEMICAL DECOMPOSITION PRODUCT IN THE SENSE THAT A QUANTITY OF THE SOLUTION OBTAINED UPON TOTALLY DECOMPOSING BY LIGH ALL OF SAID COMPOUND CONTAINED IN A WEAKLY ACID 0.004 N AQUEOUS SOLUTION OF SAID COMPOUND, WHEN MIXED WITH AN EQUAL QUANTITY OF A 0.004 N AQUEOUS SOLUTION OF PDIETHYLAMINO BENZENE DIAZONIUM CHLORIDE AND ALLOWED TO STAND AT 18* C. AND AT PH OF ABOUT 9.5, DECOMPOSES AT LEAST HALF OF THE AMOUNT OF DIAZONIUM CHLORIDE IN THE LATTER SOLUTION WITHIN 15 MINUTES, SAID DIAZO COMPOUND UPON EXPOSURE BEING CAPABLE OF REACTING WITH ITS PHOTOCHEMICAL DECOMPOSITION PRODUCT UNDER ALKALINE CONDITIONS WITH THE EFFECT THAT THE PART OF SAID DIAZO COMPOUND SO REACTED NO LONGER WILL COUPLE WITH AN AZO COUPLING COMPONENT TO GIVE A DYESTUFF; RENDERING THE EXPOSED DIAZO FILM LAYER ALKALINE TO BRING ABOUT THE AFORESAID REACTION AT SAID CERTAIN AREAS OF SAID LAYER; AND THEREAFTER DEVELOPING THE DIAZO FILM LAYER BY TREATIN IT WITH AN AQUEOUS SOLUTION CONTAINING AN AZO COUPLING COMPONENET UNDER SUCH CONDITIONS THAT SAID COMPONENT COUPLES WITH THE REMAINING PART OF SAID DIAZO COMPOUND.