Infrared sensitive silver halide color photographic elements

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

G - Physics

03

C

96/194

G03C 1/46 (2006.01) G03C 1/10 (2006.01) G03C 1/12 (2006.01) G03C 1/28 (2006.01) G03C 1/34 (2006.01) G03C 7/30 (2006.01)

Patent

CA 2034850

44952CAN6A Infrared Sensitive Silver Halide Photographic Elements ABSTRACT OF DISCLOSURE An infrared sensitive silver halide photographic element 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 color photographic element, capable of providing full color images without exposure to corresponding visible radiation, is disclosed, said ele- ment comprising at least three silver halide emulsion lay- ers on a substrate, each associated with different photo- graphic color image forming materials, such as color cou- plers capable of forming dyes of different colors upon reaction with an oxidized color photographic developer, diffusing dyes, bleachable dyes, or oxidized leuco dyes. The three emulsion layers are sensitized to three differ- ent portions of the electromagnetic spectrum with at least two layers sensitized to different regions of the infrared region of the electromagnetic spectrum. The infrared sen- sitive element is characterized in that at least one in- frared sensitized emulsion layer is associated with a 1-aryl-5-mercaptotetrazole compound substituted in the aryl group by at least one electron-attracting group. The infrared sensitive photographic element has high sensitivity to infrared radiation and undergoes less change in sensitivity during storage.

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