Infrared sensitive silver halide photographic elements

Details Infrared sensitive silver halide photographic elements Infrared sensitive silver halide photographic elements

G - Physics

03

C

96/134

G03C 1/28 (2006.01) G03C 1/29 (2006.01) G03C 1/34 (2006.01) G03C 7/392 (2006.01)

Patent

CA 2038764

45063CANlA Infrared Sensitive Silver Halide Photographic Elements ABSTRACT OF THE DISCLOSURE An infrared sensitive silver halide photographic ele- ment is disclosed comprising a support and at least one silver halide emulsion layer spectrally sensitized to the infrared portion of the electromagnetic spectrum. In par- ticular, an infrared sensitive silver halide color photo- graphic element, capable of providing full color images without exposure to corresponding visible radiation, is disclosed, said element comprising at least three silver halide emulsion layers on a substrate, each associated with different photographic color image forming materials, such as color couplers capable of forming dyes of differ- ent colors upon reaction with an oxidized color photo- graphic developer, diffusing dyes, bleachable dyes, or oxidable leuco dyes. The three emulsion layers are sensi- tized to three different portions of the electromagnetic spectrum with at least one layer sensitized to radiation within the infrared region of the electromagnetic spec- trum. The infrared sensitive element is characterized in that at least one infrared sensitized emulsion layer is associated with a 5-arylamino-1,2,3,4-thiatriazole com- pound wherein the aryl group has at least one electron- attracting group substituent. The infrared sensitive color photographic element having an effective amount of said compound therein has high sensitivity to infrared radiation and undergoes less change in sensitivity during storage.

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