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    • 9. 发明授权
    • Fragmentable electron donor compounds combined with broad blue spectral sensitization
    • 可分散的电子给体化合物与广泛的蓝色光谱增感相结合
    • US06509144B1
    • 2003-01-21
    • US09236821
    • 1999-01-25
    • Kenneth J. ReedJoseph P. PepeJames A. FridayJon N. EikenberryYun C. ChangAnnabel A. MuenterJerome R. Lenhard
    • Kenneth J. ReedJoseph P. PepeJames A. FridayJon N. EikenberryYun C. ChangAnnabel A. MuenterJerome R. Lenhard
    • G03C110
    • G03C1/10G03C1/0053G03C1/28G03C1/29
    • 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, &bgr;−, 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• and the leaving fragment Y′; and, optionally, 3) the radical X• has an oxidation potential ≦−0.7V (that is, equal to or more negative than about −0.7 V).
    • 本发明包括一种照相元件,其包括载体和至少一种含有片状银卤化银乳剂的蓝色感光卤化银乳剂层,或其中卤化物含量为至少50%氯化物和不超过5%碘化物的乳液,其中 该乳液用至少一种提供446和500nm之间的峰敏感的染料和至少一种提供400和445nm之间的峰敏感的染料进行光谱增感,并用下式X-Y'的可裂解的电子给体进一步增感。 或含有-XY'部分的电子给体;其中X是电子给体部分,Y'是离开质子H或离去基团Y,条件是如果Y'是H,则基团是共价连接的 直接或间接地与X并且其中:1)XY'具有介于0和约1.4V之间的氧化电位; 和2)X-Y'片段的氧化形式,得到X基团和离去片段Y'; 和任选地,3)基团X的氧化电位<= -0.7V(即等于或大于约-0.7V的负)。