Color photographic material having enhanced light absorption
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United States of America Patent
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Dec 11, 2001
Grant Date -
N/A
app pub date -
Sep 13, 1999
filing date -
Sep 13, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention comprises a silver halide photographic material comprising at least one silver halide emulsion comprising silver halide grains having associated therewith a combination of two or more dyes wherein (b) (a) a dye having at least one substituent that has a negative charge is present, a dye having at least one substituent that has a positive charge is present, wherein at least one of the dyes is further substituted with at least one hydrogen bonding donor substituent. In a preferred embodiment, at least one of the dyes is substituted with at least two hydrogen bonding donor substituents. In another preferred embodiment a silver halide photographic material comprises at least one silver halide emulsion comprising silver halide grains having associated therewith a dye substituted with at least one guanidinium, amidinium, or imine of urea substituent.
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