Photographic process for making diazotype copies utilizing small

Details Photographic process for making diazotype copies utilizing small Photographic process for making diazotype copies utilizing small

1974-10-24

1977-08-23

Bowers, Jr., Charles L.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 75, 96 91R, G03C 158, G03C 534

Patent

active

040438163

ABSTRACT:
Diazotype copies are produced from one-component diazotype material in a practically dry state without adversely affecting their feel or the speed of development. The diazotype material comprises a support and a light-sensitive surface layer having an average maximum thickness of not more than 8 micrometers and comprising 0.2-2 milligram molecules of one or more diazo compounds, which, in vitro, couple more actively than 4-diazo-2-chloro-N.N.-diethylaniline. After imagewise exposure the copy is developed by applying to the light-sensitive surface of the diazotype material a quantity amounting to 1.5 to 4.5 cm.sup.3 /m.sup.2 of an aqueous, buffered solution, which is at a pH of between 5.5 and 7 and which comprises per liter 0.1-0.6 g.mol of azocoupling component, consisting for at least 50% by weight of phloroglucinol and 1-3 g. equivalents of buffer salt. The diazo layer advantageously is formed by spreading 2-8 cm.sup.3 of sensitizing solution of adapted concentration onto the support.

REFERENCES:
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patent: 2773768 (1956-12-01), Sanders et al.
patent: 2792303 (1957-05-01), Sanders et al.
patent: 3261684 (1966-07-01), Wilders et al.
patent: 3338713 (1967-08-01), Hendrickx et al.
patent: 3385705 (1968-05-01), Dippel et al.
patent: 3446620 (1969-05-01), Parker
patent: 3615485 (1971-10-01), Islam et al.

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