US 5,372,921 A · High-contrast photographic elements with enhanced safelight performance

Abstract

A high-contrast room-light-handleable black-and-white silver halide photographic element that is especially useful in the field of graphic arts is comprised of a support, an imaging layer containing doped silver halide grains with a mean grain size of less than 0.12 micrometers, a print-out layer containing doped silver halide grains with a mean grain size in the range of from 0.14 to 0.4 micrometers, and a third set of doped silver halide grains with a mean grain size of less than 0.12 micrometers distributed within the print-out layer or within a separate safelight protection layer. Dopant levels are controlled so that the photographic speed of the imaging layer is higher than the photographic speed of the print-out layer and so that the photographic speed of the third set of silver halide grains is less than that of the imaging layer. The element utilizes very slow speed emulsions which render it capable of being handled in room light and is able to print-out a visible image on normal exposure and develop to full density upon being processed in conventional developing solutions.

Claims15

Dependent claims

A high-contrast room-light-handleable black-and-white silver halide photographic element;

said element comprising:
(1) a support,
(2) an imaging layer containing doped silver halide grains with a mean grain size of less than 0.12 micrometers,
(3) a print-out layer containing doped silver halide grains with a mean grain size of from 0.14 to 0.4 micrometers;
and
(4) a third set of doped silver halide grains which function to enhance safelight performance;
the dopant level of the silver halide grains of said imaging layer and the dopant level of the silver halide grains of said print-out layer being such that the photographic speed of said imaging layer is higher than the photographic speed of said print-out layer;
said third set of doped silver halide grains having a mean grain size of less than 0.12 micrometers and a dopant level that provides a photographic speed that is less than that of said imaging layer and being distributed within said print-out layer or within a separate safelight protection layer.

5 more elements

Dependencies are inferred from the claim text.

High-contrast photographic elements with enhanced safelight performance

Life of this patent

High-contrast photographic elements with enhanced safelight performance

Life of this patent

Abstract

Claims15