Infra-red sensitive photographic materials

Details Infra-red sensitive photographic materials Infra-red sensitive photographic materials

C - Chemistry, Metallurgy

07

D

C07D 521/00 (2006.01) C09B 23/01 (2006.01) G03C 1/20 (2006.01) G03C 1/26 (2006.01)

Patent

CA 2045902

43860CAN2A ABSTRACT Infra-red Sensitive Photographic Materials Cyanine dyes are disclosed having a nucleus of the formula: (I) Image wherein; A and B are independently selected from the group consisting of heterocyclic ring nuclei and heterocyclic fused ring nuclei so as to complete a cyanine dye, m and n independently have values of 0, 1, 2 or 3 with the proviso that 2 ? m + n ? 4, R is selected from the group consisting of hydrogen, alkyl groups and aryl groups, each of which groups may be substituted, and Q represents those non-metallic atoms necessary to complete a nucleus selected from the group consisting of heterocyclic ring nuclei, carbocyclic ring nuclei, heterocyclic fused ring nuclei and carbocyclic fused ring nuclei. The cyanine dyes of formula (I) may be used to spectrally sensitise silver halide grains to radiation in the wavelength range from 650 nm upwards, especially 700 to 850 nm, to provide infrared-sensitive, silver halide photographic materials which are particularly suitable for use with electronically modulated exposure sources, such as lasers and light emitting diodes.

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