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    Photographic element containing a DIR coupler
    1.
    发明授权
    Photographic element containing a DIR coupler 失效
    含有DIR耦合器的摄影元件

    公开(公告)号：US06346371B1

    公开(公告)日：2002-02-12

    申请号：US09857829

    申请日：2001-06-07

    申请人： Andrew S. Craig ,  Richard P. Szajewski

    发明人： Andrew S. Craig ,  Richard P. Szajewski

    IPC分类号： G03C108

    CPC分类号： G03C7/3225 ,  G03C1/0051 ,  G03C7/3022 ,  G03C2001/03517 ,  Y10S430/158

    摘要： The invention provides a photographic element comprising at least one emulsion layer comprising at least 50 mol % silver chloride, which layer comprises at least one DIR coupler in association with at least one image dye-forming coupler, characterised in that the relative reactivity ratio krel of at least one DIR coupler and an associated image coupler is less than or equal to 1.0, wherein krel=k1/k2; k1=the second order rate constant for the reaction of DIR coupler with oxidised developer and k2=the second order rate constant for the reaction of image coupler with oxidised developer. The DIR couplers when associated with image couplers such that the above condition is satisfied efficiently reduce development of silver halide emulsions containing at least 50 mol % silver chloride, there being a reduction in contrast providing a linear sensitometric curve over a good latitude with negligible speed penalty.

    摘要翻译： 本发明提供了一种照相元件，其包括至少一种包含至少50mol％氯化银的乳剂层，该乳剂层包含至少一种与至少一种影像染料形成成色剂结合的DIR成色剂，其特征在于相对反应性比率krel 至少一个DIR耦合器和相关联的图像耦合器小于或等于1.0，其中i = DIR耦合器与氧化显影剂的反应的二阶速率常数，k2 =图像耦合器与氧化显影剂反应的二阶速率常数 当与成像器相关联的DIR耦合器使得满足上述条件有效地降低了含有至少50mol％氯化银的卤化银乳剂的显影时，对比度的降低提供了良好纬度的线性感光度曲线，具有可忽略的速度 罚款。