Photographic print-out silver halide process

Details Photographic print-out silver halide process Photographic print-out silver halide process

1978-06-26

1980-06-10

Louie, Jr., Won H.

Radiation imagery chemistry: process, composition, or product th

Including exposure step or specified pre-exposure step...

430461, 430434, 430599, 430606, 430644, G03C 504

Patent

active

042071038

ABSTRACT:
A print-out image can be produced with certain internally photosensitive silver halide materials by a high intensity exposure to provide a print-out image that is resistant to background print-up under ambient illumination. The photographic silver halide material with which the process is useful comprises photosensitive silver halide grains in which the sensitivity sites where a latent image can be formed on light exposure are predominantly inside the grains. Also, at least one electron-accepting compound having a polarographic reduction potential within the range of about -0.8 volt to about -0.01 volt is required on the photosensitive silver halide in the process. The photosensitive silver halide is imagewise exposed to illumination having an intensity greater than about 3 watts per square centimeter. Following imagewise exposure, a print-out image can be observed; if the exposed element is not exposed to ambient light, the print-out image can be intensified by developing in a surface developer. If, however, the exposed element is further exposed to ambient light, the surface image is lost but the print-out image may be intensified by developing with an internal developer.

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Product Licensing Index, vol. 92, 12-1971, Item No. 9232.

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