Continuous tone diazotype process

Details Continuous tone diazotype process Continuous tone diazotype process

1977-06-13

1979-04-10

Bowers, Jr., Charles L.

Gas separation: apparatus

Electric field separation apparatus

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

96 75, 96 91R, G03C 518, G03C 160

Patent

active

041486463

ABSTRACT:
A diazotype material useful for making duplicates of continuous tone originals, such as X-ray films, comprising a transparent film support having a coating of a layer thereon consisting essentially of at least two light-sensitive diazo compounds having different photolysis rates, couplers for the diazo compounds, an ultraviolet radiation absorbing material and homogeneously distributed in the layer at least about 7% by weight, based on the weight of lacquer, of an inert particulate material such as silica. The use of this material makes it possible to approximate a logarithmic photolysis, thereby providing sufficient linearity in the corresponding characteristic curve to achieve the desired duplicating results.

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patent: 3996056 (1976-12-01), Muller
Muller, P., "Precoating of Diazotype Paper", Tappi, 8/1965, pp. 55A-59A.

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