Fragmentable electron donor compounds combined with broad blue spectral sensitization
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United States of America Patent
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Jan 21, 2003
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N/A
app pub date -
Jan 25, 1999
filing date -
Jan 25, 1999
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Expired
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Abstract
This invention comprises a photographic element comprising a support and at least one blue sensitive silver halide emulsion layer containing a tabular grain silver halide emulsion, or an emulsion in which the halide content is at least 50% chloride and no more than 5% iodide, wherein the emulsion is spectrally sensitized with at least one dye providing a peak sensitization between 446 and 500 nm and at least one dye providing a peak sensitization between 400 and 445 nm and additionally sensitized with a fragmentable electron donor of the formula: X--Y'. or an electron donor which contains an --XY' moiety; wherein X is an electron donor moiety, Y' is a leaving proton H or a leaving group Y, with the proviso that if Y' is H a base, .beta..sup.-, is covalently linked directly or indirectly to X. and wherein: 1) X--Y' has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X--Y' fragments to give the radical X.sup..cndot. and the leaving fragment Y'; and, optionally, 3) the radical X.sup..cndot. has an oxidation potential .ltoreq.-0.7V (that is, equal to or more negative than about -0.7 V).
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